Electronic Diode Distributor in China
- Have a reverse voltage ranging from 100 V to 200 V.
- Used for freewheeling high frequency inverters and polarity protection.
- High current, guard ring for transient protection, high surge capability, and low power loss.
- Tend to vary in reverse voltage ranges from 400 up to 1000 volts at 1 to 6 amps surface mount package.
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Reputed Electronic Diode Supplier - Rantle East Electronic
RANTLE Electronic diode have a reverse voltage ranging from 100 V to 200 V. The electronic diode has a low forward drop and is available in any packages. It is used for freewheeling high frequency inverters and polarity protection.
RANTLE Electronic Diode features high current, guard ring for transient protection, high surge capability, low power loss and plastic material carries UL recognition 94V-0. The polarity markings on the device.
RANTLE Electronic Diode is in standard T-1 ¾ (5mm) through-hole package. They have a clear, unstinted plastic package with a parabolic lens. Suitable applications for IR radiation source for CMOS cameras, high speed IR data transmission, smoke automatic fire detectors and IR flash applications.
RANTLE Electronic Diode comes with silicon rectifiers tend to vary in reverse voltage ranges from 400 up to 1000 volts at 1 to 6 amps surface mount package. They feature low voltage drop, low reverse current and produce a high current power.
RANTLE Electronic Diode are widely used throughout all areas of the electronics industry from electronics design through to production and repair. It is very versatile, and there are very many variants and different types of diode that enable all variety of different applications to be met. This includes those for small signal applications, high current and voltage as well as for light emission and detection.
With almost 15 years of distributing strong sources of electronic diode, RANTLE can assures you good quality and high standards electronic diode. Our quality control team is working hard to ensure the quality of all the parts we are selling. We provide 30 days warranty so you have nothing to worry about. If you are interested on our electronic diode, feel free to contact with us. Within 24 hours, our friendly and knowledgeable sales team will contact with you.
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Electronic Diode: The Ultimate FAQ Guide
This is a comprehensive guide with all the vital concepts about electronic diodes.
It covers forward biasing, reverses biasing, avalanche breakdown, Zener breakdown, manufacturing process, applications, and parameters, just to mention a few.
Take a look.
- What is Electronic Diode?
- How does Electronic Diode Work?
- What is the Zener Breakdown and Avalanche Breakdown?
- How do you Classify Electronic Diodes?
- What Types of Electronic Diodes are there?
- What is the Difference between a Normal Diode and Zener Diode?
- Where are the Uses of Electronic Diodes?
- What are Electronic Diode Parameters?
- What are the Anode and Cathode?
- What Circuits use Electronic Diodes?
- What is Biasing in Electronic Diodes?
- What is the Difference between Electronic Diode and a Thyristor?
- How do you Identify Specifications for Electronic Diode?
- Is a Rectifier Electronic Diode?
- How do you Read a Diode Color Code?
- Can an LED be used as a Photodiode?
- What are the Characteristics of Electronic Diodes?
- How do you tell if a Diode is ON or OFF?
- How can you Test an Electronic Diode?
- What is the Difference between an Electronic Diode and a Rectifier?
- Can Electronic Diode be used as a Voltage Source?
- Do Electronic Diodes have Resistance?
- What is the difference between a Transistor and Electronic Diode?
- How do you Manufacture Electronic Diode?
What is Electronic Diode?
An electronic diode is a semiconductor device with two terminals that allows the flow of current on only one direction.
The flow of current is the direction with the least resistance. The opposite direction has very high resistance that discourages current flow.
Normally, the most common semiconductor materials used for the electronic diode are silicon and germanium.
The semiconducting material determines a diode’s voltage requirement.
To forward bias diode made from silicon, you require about 0.7 volts. One with germanium material is 0.3v.
You can identify a silicon-based electronic diode by locating the darkened band. It usually designates the cathode.
Typically, the cathode terminal is made of n-type material, whereas the anode is made of p-type material.
A semiconducting material is p-type when made more positively charged.
This causes the presence of more holes in the terminal.
The n-type is made of semiconducting material that has been made more negatively charged. There is a more electron present in the material.
How does Electronic Diode Work?
You find that the two terminals in an electronic diode are referred to as the anode and cathode. These two terminals provide the basis of operation for the electronic diode.
The diode functions via a process called biasing.
An electronic diode can either be forward biased or reverse biased.
Forward biased diode
Forward biasing diode implies anode has relatively higher voltage than it’s cathode.
When a diode is forward biased, there is little or no resistance at all in the anode-cathode current path.
The current begins to flow when the threshold voltage is surpassed.
You find that as current flows, the voltage drops at a constant rate across the electronic diode.
Reverse biased diode
For reversed biased, the cathode will have relatively higher voltage when you compare it to the anode.
The voltage at the cathode is higher than the voltage at the anode when reverse biased.
Ideally, the resistance in the anode to cathode current path is to be infinite.
However, due to inherent deficiencies, there is bound to be a minimal amount of current leakage.
Still, there is high resistance that discourages the flow of current in that direction.
With reverse bias current flows in the opposite direction, that is, from the cathode towards the anode.
Sometimes the current flow is overwhelming to the point of damaging the diode.
What is the Zener Breakdown and Avalanche Breakdown?
These are some of the most common phenomenon when using electronic diodes.
When an electronic diode is reverse biased, a strong electric field is formed at the depletion layer.
This causes the electronic diode to allow current flow in the opposite direction.
The reversal of the direction of current flow occurs sharply, resulting in the production of a large current.
This occurrence is what is referred to as the Zener breakdown. If left unchecked, the current surge from the energy breakdown could damage the diode.
The size of an electronic diode’s depletion layer greatly influences the size of the electric field formed.
Consequently, it determines the voltage at which the Zener breakdown occurs.
This way, diodes can be made to delay the occurrence of Zener breakdown to higher voltage values.
The avalanche breakdown occurs when an electronic diode is reverse biased and at a high voltage.
Also, the increased voltage amount introduces a large electric field at the depletion layer.
At the same time, the kinetic energy of the minority charge carriers increases.
The minority charge carries at the depletion layer are due to the doping of the semiconductor terminals.
Electrons stray into the p-type and holes into the n-type.
The rapid movement of these carriers causes them to bump with the majority carriers of the terminals.
As a result of the collisions, the majority carriers are knocked off, increasing the activity at the depletion layer.
The electric field grows larger and more robust, overcoming the reverse current in the diode. This occurrence is referred to as the avalanche breakdown.
Avalanche breakdown destroys the P-N junction by completely burning it off.
Differences between the Zener and Avalanche Breakdown
- The Zener breakdown is caused by the build-up of a large electric field that acts on the depletion layer.
The avalanche breakdown is a result of the rapid bumping of charge carriers at the P-N junction.
- While ionization occurs in both the breakdowns, it is due to the bumping of molecules in an avalanche breakdown.
In a Zener breakdown, it is a result of the developed field of electric force.
- While the Zener breakdown is most profound with thin depletion layers, the avalanche breakdown manifests in the thick depletion region.
- The diode’s junction is permanently deformed when an avalanche breakdown occurs. A Zener breakdown only alters the junction position temporarily.
- The Zener breakdown is prevalent in a highly doped semiconducting material, while avalanche breakdown occurs in materials that are doped lowly.
- The two breakdowns have a distinct voltage-temperature relationship. The relationship is direct with the avalanche breakdown and indirect with the Zener breakdown.
- A Zener breakdown is accompanied by decreasing temperature and decreased reverse potential.
An avalanche breakdown occurs at increasing temperature and high opposite potential.
How do you Classify Electronic Diodes?
You find there are many modes of classifying electronic diodes.
The most common basis for classification is according to the diode function.
Additionally, you find diodes can be classified according to their shape, operating frequency, and structural design.
These classification forms provide an insight into the many types of electronic diodes that are in existence.
What Types of Electronic Diodes are there?
There are many types of electronic diodes that you will stumble upon with different characteristics and functionality.
Some diode types are described as follows.
1. P-N Junction Diode
P-N Junction Diode
The p-n junction diode is a two-terminal electronic diode with p-type and n-type terminals.
Here, the p-type and n-type terminals form a p-n junction, which gives the diode its name.
Also, the p-type terminal has more holes in its structure, whereas the n-type has more electrons.
A p-n junction will conduct in one direction.
That is when the in forward biased state.
However, when it is reversed biassed, the diode will restrict flow.
It is forward biased when you connect the positive terminal of the battery to the diode’s anode, with the negative terminal to its cathode.
Otherwise, it is reverse biased.
A p-n junction diode finds use in logic circuits as a switch.
You can also convert alternating current to direct current using the p-n junction diode.
This application allows them to be employed in electronic devices for power supply.
2. Small and Large Signal Diode
This signal diode is small in size, as its name suggests, and enclosed in a glass chamber.
Due to its size and enclosure, the cathode terminal is identified through color coding.
It is used in high-frequency applications with minimal current needs such as audio and visual equipment.
Small signal diode
The large depleting layer for the large signal diode is what gives its name, allowing limitless conversion of AC to DC voltage.
This results in the production of a large current that is forward biased and increased resistance in the reverse direction.
Also, the large signal diode is only suitable for applications requiring small frequency levels. They find use in applications requiring the need to prevent spikes in voltage levels and in inverters.
3. Zener Diode
A Zener diode is an electronic diode precisely fabricated to counter the effect of Zener breakdown.
In this case, the Zener diode has a smaller depletion layer due to more doping of its semiconductor terminals.
This causes a vast current outflow.
Zener breakdown occurs in normal electronic diodes when reversing biased.
The Zener diode can operate when forward and reverse biased.
When forward biased, it allows a forward flow of current while restricting current flow in the reverse direction.
A Zener diode is reverse biased when the voltage that is set is more than the Zener voltage.
This is how it is fashioned to work in a circuit.
Zener diodes find use as protective elements from voltage surges in electronic devices. Additionally, they are used as regulators for the voltage level of devices.
4. Avalanche Diode
This diode is rigged to induce an avalanche breakdown to avert impairment when a determined voltage is reached at reverse bias.
Such diodes are used to safeguard electrical components from voltage spikes.
When a breakdown occurs, there is a slight drop in voltage.
Unlike Zener diodes, they are minimally doped.
The level of doping determines the amount of voltage that will necessitate a breakdown.
You find that the doping level also explains the large size of this diode’s depletion region.
This, in turn, explains the high reverse breakdown voltage.
An avalanche breakdown, you will experience this in the p-n junction depletion region.
It takes place due to ionization caused by the rapid collision of minority charge carriers.
For an avalanche diode, the breakdown does not vary across the junction with an unchanging voltage, unlike current that varies.
The junction is thus made to inhibit the current build-up preserving the diode.
You find avalanche diodes employed in circuits to offer protection from voltage surges.
They are also used in communication equipment to generate radio frequency noise.
Additionally, you will find avalanche diodes in light detectors to identify high gain particles and the production of microwave frequency.
5. Light-emitting Diode
Light emitting diode
When a light-emitting diode is forward biased, it produces an indistinct unicolor light signal through a process called electroluminescence.
This process transforms the energy in the form of an electric signal to light whose intensity is dependent on the signal strength.
The light produced by the diode will depend on the material used for the semiconductor.
Consequently, to produce an array of different lights, you will need to have LEDs of different semiconducting material.
LED lights and televisions are an excellent example of the application of light-emitting diodes.
Types of diodes
The photodiode is an electronic diode that converts a light signal into a voltage or electric current when reverse biased.
When light passes through the lenses and filters, it is absorbed by the photodiode, which duly converts it into the current.
Photodiodes have photosensitive filters, lenses, and a surface area for light absorption.
The larger the surface area, the slower the diode reacts to convert the light into current.
You will find the photodiode applied in various fields.
- Consumer electronics such as televisions and smoke detectors utilize photodiodes.
- Photodiodes can be used to measure light intensity due to their effective linearity in responding.
- Biomedical engineering has found a use for photodiodes in developing analysis instruments.
- The photodiode has enabled the ability to generate solar power from UV light.
7. Laser Diode
The laser diode is a p-type and n-type diode with design elements similar to the light-emitting diode.
It produces distinct radiation at the depletion region that possesses a specific frequency and wavelength.
You find that a laser diode will only work upon the application of a threshold power level.
It also produces a unicolor with the size of the layer determining the intensity.
Additionally, it possesses steady linearity allowing for a straight forward launch.
There are different types of laser diodes as follows:
- Quantum Well Lasers with multiple quantum wells
- Quantum Cascade Lasers that allow laser activity at long wavelengths
- Separate Confinement Hetero-structure lasers mediate the problem of a narrow region in quantum lasers
- Double Hetero-structure Laser with the duplicity of majority and minority carriers at the depletion region
- Distributed Bragg Reflector Lasers
Laser diodes are prevalent in electronics such as printers and digital media disc player.
You also find lasers useful in the telecommunication industry with their usage in fiber optics.
Fine measurement instruments such as the spectrometer utilize laser diodes.
Engineering applications utilize laser diodes in their welding and cutting equipment to produce laser beams.
An advantage of the laser diode is its low working power compared to the light-emitting diode. They are also small and highly effective in their performance.
However, they are costly, and the beams generated are highly damaging to the natural eye.
8. Schottky Diode
The Schottky diode junction differs from ordinary diodes by pairing an n-type semiconductor terminal with a metal terminal.
Moreover, the metal terminal could be made from various materials, including tungsten and platinum.
In this case, the metal represents the cathode while the n-type terminal the anode.
When forward biased, the voltage drop across the diode is greatly reduced.
The presence of metal at the junction gives the Schottky diode ability to decrease switching time and transfer large current.
The Schottky diode can operate in high frequencies with low voltage drops and power loss.
They are employed in switching applications and as rectifiers.
More so, you will find these diodes used to prevent overcharging of transistors in a process called voltage clamping.
9. Shockley Diode
Also called the PNPN diode, it features four semiconductor layers that form three junctions, operating only either as ON or OFF.
The semiconductor layers are a pair of p-type and another pair of n-type.
It differs from a common diode by only allowing current flow after the threshold voltage is overcome.
It could pass as thyristor only lacking a gate terminal.
A Shockley diode only allows current to flow when forward biased. Reverse biasing restrict conduction.
The Shockley diode can carry out switching functions due to its two-state operating condition. In this way, it is employed in the silicon controlled rectifier. It also used as a relaxation oscillator.
10. Tunneling Diode
The tunnel diode is similar to the p-n junction diode but with a higher doping level of impurities.
High resistance is developed, resulting in the reduction of current flow across the diode with increasing voltage.
The tunneling effect of electrons as they traverse the depletion layer creates the electric field.
Tunnel diodes are characterized by their high operational speeds, low noise levels and consumption of power, and longevity.
They are useful in computer systems as switching devices with high speeds, and in oscillators and amplifiers operating at high frequencies.
Additionally, they find application in microwave circuits and to store logic memory.
11. Varactor Diode
A varactor diode is formed of two terminals of semiconducting material, the p-type and n-type. The terminals create a depletion region at the junction through electron and hole recombination.
Besides, the varactor diode varies the capacitance here by altering the size of the depletion region.
A varactor diode operates when it is reverse biased. It is light and small in size generating limited noise.
It also has low production costs allowing common usage.
You will find the varactor diode used in voltage-controlled oscillators in the telecommunication industry.
Televisions and radio receivers utilize varactor diodes in tuning.
Additionally, you find these diodes useful in phase-locked loops to modulate frequency. Frequency multipliers and parametric amplifiers employ varactor diodes too.
12. Transient Voltage Suppression Diode
Transient voltage suppression diode
A Transient Voltage Suppression Diode is a diode used to subdue transients in circuits. Transients are voltages spikes in circuits that occur suddenly and at high-frequency levels, and if left unchecked, are destructive.
A TVS diode can subdue a transient by reducing the voltage surge, dissipating a surge, or redirecting the surge.
It exploits the avalanche breakdown in the depletion region.
An ordinary diode permanently deforms the junction when an avalanche breakdown occurs. However, with the TVS diode, the junction can realign ready for the following surge.
They also safeguard the circuit from electrostatic discharge above ground, below ground, or both.
The TVS diode is useful across various industrial fields due to its faster response time than varistor diodes.
They are typically employed in input devices to protect them from developing charges that can cause electrostatic discharge.
13. Step Recovery Diodes
Step recovery diode
This silicon diode can produce sharp pulses by storing positive pulse charges from sinusoidal signals.
It can operate in intermediate levels of power and find use as a switch that is controlled by the charge levels.
This gives the SRD the ability to recover pulses at high speed.
Application for the step recovery diode includes its usage in electronics utilizing microwave frequencies.
It is used in the making of pulse generators and the generation of waveforms and exponentiation of frequency.
What is the Difference between a Normal Diode and Zener Diode?
There are points of disparity between a normal electronic diode and a Zener diode. Some are mentioned below.
- A standard electronic diode functions in only one direction and when forward biased only.
The Zener diode is uniquely designed to conduct current when both forward and reverse biased.
- Zener diode’s exceptional functionality is a result of being overly doped when compared to a standard electronic diode.
- The Zener diode’s breakdown voltage is of a higher value than the ordinary electronic diode.
This allows the Zener diode to withstand a higher degree of reverse voltage.
Where are the Uses of Electronic Diodes?
With the many types of electronic diodes, you find many uses of the semiconducting device.
Electronic diodes find usage as regulators, rectifiers, electronic switches, oscillators, signal mixers, and modulators.
Other uses include as attenuators and photodetectors.
You can use an ordinary p-n junction diode as an electronic switch and a Zener diode to regulate voltage.
Small and large signal diodes are used in high and small frequency applications, respectively.
Additionally, you find optical diodes such as the LED and photodiode being employed in consumer electronics.
Varactor diode finds use in frequency modulators, whereas TVS diodes are employed to subdue transients in circuits.
You find laser diodes in electronic equipment like printers and disc players.
On the other hand, tunneling diodes find use in computers as switching devices.
Meanwhile, pulse recovery diodes are used in pulse generators.
What are Electronic Diode Parameters?
Parameters describe certain measurable aspects of a semiconducting device that governs its operations.
The following describes some electronic diode parameters.
1) Maximum Reverse Breakdown Voltage /Peak Inverse Voltage
This parameter indicates the highest reverse voltage value an electronic diode can endure when reverse biased.
When this voltage amount is exceeded, there occurs a breakdown at the p-n junction.
The peak inverse voltage is affected by temperature.
Also, the reverse breakdown voltage is colloquially used by manufacturers to indicate this amount.
It is provided in volts.
2) Maximum Reverse Current/Leakage Current
When an electronic diode has been reverse biased, and a voltage applied, some current flows through the diode.
The maximum reverse current provides the highest possible current value when the highest possible reverse voltage amount is reached.
3) Maximum Forward Current
This parameter indicates the highest current amount that an electronic diode can conduct while forward biased.
It is an average value and is measured in amperes.
4) Power Dissipation
This parameter provides the highest possible amount of power that an electronic diode can dissipate/disperse.
Power dissipation is measured in watts.
There are two parameters of an electronic diode related to temperature: the operating junction temperature and the storage temperature range.
Both temperature values are provided in degrees Celsius.
The operating junction temperature provides the highest possible temperature value that the p-n junction can endure for proper functionality.
The storage temperature range indicates the temperature extremities at which an electronic diode can be stored without impacting its functionality.
When diodes have to be used in frequency applications, the frequency parameter is useful.
It provides the maximum and minimum frequency levels suitable for an electronic diode.
What are the Anode and Cathode?
You find an electronic diode is a semiconducting device with two terminals, one p-type and the other n-type.
In the electrical configuration, the anode and cathode are used to refer to the positive and negative terminal, respectively.
For an ordinary electronic diode, the p-type terminal is the anode, whereas the n-type terminal is the cathode.
What Circuits use Electronic Diodes?
You find electronic diodes are used in circuits requiring the flow of current in one direction.
This is because electronic diodes only allow conductivity in one direction while restricting flow in the reverse direction.
What is Biasing in Electronic Diodes?
When you bias an electronic diode, you apply a certain voltage and current conditions on the diode before beginning an operation.
You can either forward bias or reverse bias into an electronic diode.
Connecting the positive battery terminal to the diode’s anode and the negative battery terminal to the cathode is forward biasing.
Connecting the positive battery terminal to the cathode and the negative battery terminal to the anode is to reverse bias.
What is the Difference between Electronic Diode and a Thyristor?
A thyristor is a semiconducting device with four layers of p-type and n-type.
The arrangement is such that a p-type is followed by an n-type, another p-type, and finally an n-type.
Also, the thyristor finds use primarily as a switch and rectifier.
An electronic diode is a two-terminal, p-type and n-type, semiconducting device that is unidirectional in conductivity.
Alongside the design difference, other differences between the electronic diode and thyristor are as follows.
- The design configuration of the electronic diode allows it one junction. For a thyristor, its design creates three junctions.
- You find an electronic diode with a single anode and cathode for terminals. The thyristor has an anode, cathode, and a gate making three terminals. The gate is used for triggering.
- Thyristors require higher voltages to operate than electronic diodes in addition to superior handling of power.
- A thyristor has to be externally triggered before it starts. With an electronic diode, that is unnecessary.
- The four-layer construction of a thyristor makes them bulkier than the electronic diode. Additionally, they cost more to construct and, as such, to purchase.
How do you Identify Specifications for Electronic Diode?
Each electronic diode has a specific code you use to identify it.
This coding typically consists of a combination of letters and numbers.
It helps in identifying aspects such as the semiconducting material used and the intended function.
The system for identifying electronic diode specifications is standardized and accepted as follows.
- The first character is usually a letter, and it identifies the semiconducting material used. This could be silicon, germanium, gallium, or some other material.
- The second character is also a letter. It denotes the application of the electronic diode. You can identify the type of electronic diode you have by the second letter.
- The third character is a letter and elaborates on the application indicated by the second character. It is usually followed by numbering that serves as an identity moniker for the diode.
Is a Rectifier Electronic Diode?
No, it is not.
A rectifier is a device used in the conversion of alternating current to direct current.
A rectifier comprises an electronic diode, a transformer, and a conversion circuit.
How do you Read a Diode Color Code?
Diode color code
When an electronic diode is colour coded, a colour chart is useful in determining the type of electronic diode.
You find electronic diodes are banded and interpreted from left to right.
With this chart, colours are assigned values that help you identify the electronic diode.
After jotting down the values, you can interpret them to correctly identify a diode.
Can an LED be used as a Photodiode?
Yes, it can.
The photodiode converts a light signal into a voltage or electric current when reverse biased.
A light-emitting diode produces an indistinct unicolor light signal when forward biased.
An LED can detect a light signal allowing you to use it as a photodiode.
What are the Characteristics of Electronic Diodes?
You find the following important characteristics of an electronic diode.
These are the forward voltage drop, the reverse voltage drop and the reverse breakdown voltage.
The forward voltage drop is the maximum voltage amount when an electronic diode is forward biased.
Also, the reverse voltage drop is the maximum amount of voltage when the diode is reverse biased.
Reverse breakdown voltage is the voltage amount at which breakdown occurs.
How do you tell if a Diode is ON or OFF?
You can tell an electronic diode is “on” or “off” by monitoring the voltage across the diode.
A negative voltage indicates an “off” status since it does not allow the flow of current.
A positive voltage allows current flow and as such “on” status.
How can you Test an Electronic Diode?
You test an electronic diode by using a digital multimeter to measure the diode’s forward voltage drop.
First, you need to ensure the circuit is free of power before attempting measurement.
You then connect the diode to the multimeter conventionally before reversing the leads. You record readings for both instances.
An electronic diode that is okay will give a voltage drop reading of at most 0.8 volts when forward biased.
It will indicate an overload when reverse biased, similar to a faulty diode in both forward and reverse bias.
An electronic diode that has shorted provides a similar voltage reading for both reverse bias and forward bias.
What is the Difference between an Electronic Diode and a Rectifier?
You find the following differences between the electronic diode and rectifier.
- An electronic diode allows unidirectional flow of current when forward biased, restricting flow while reverse biased.
A rectifier is used explicitly for rectification where alternating current is converted into direct current.
- An ordinary p-n junction diode can convert alternating current into direct current and therefore acts as a rectifier.
A rectifier, on the other hand, cannot act as a switch.
- Electronic diodes have a lower conductivity compared to rectifiers.
Can Electronic Diode be used as a Voltage Source?
Yes, it can.
A circuit component providing a voltage value is a voltage source.
When you apply a current to an electronic diode, it produces a voltage drop across it.
In standard diodes, the current applied is indirectly related to the forward current.
Do Electronic Diodes have Resistance?
Resistance is defined as the characteristic of a diode to resist the flow of current in a circuit.
Doping of the semiconducting materials used in making an electronic diode ensures their functionality is non-linear.
A diode’s resistance is affected by the set current and applied voltage.
However, there is no direct and proportional relationship with the resistance varies.
What is the difference between a Transistor and Electronic Diode?
An electronic transistor is a device with a triple terminal formation used to regulate electrical signals by amplifying or switching them.
The terminals allow electron flow.
The electronic transistor and diode differ in the following ways.
- While the electronic diode has two terminals, the electronic transistor has three terminals.
The two terminals are the anode and cathode. The three terminals are the emitter, base, and collector.
- The electronic diode has a single depletion layer formed at the p-n junction.
Also, the electronic transistor has two depletion regions formed at the two junctions.
- While an electronic diode is restricted to switching purposes only, an electronic transistor can additionally amplify signals.
- The electronic transistor can be described as a voltage-controlled device. The electronic diode can be described as a current-controlled device.
How do you Manufacture Electronic Diode?
You find that electronic diodes are semiconducting devices and thus made from semiconducting materials.
Silicon wafers are mostly used for the manufacture of electronic diodes.
Depending on usage, different techniques are employed to come up with semiconductor diodes.
Point Contact Diode
Here, a small and thin wafer of n-type is treated to heating using radiofrequency.
One side is soldered to a metal surface as a result.
A tungsten or bronze wire is pressed against the other surface at a high temperature.
A barrier forms creating a p-type region.
The process results in a small half domed p-n junction.
This size inhibits precision control, and the resulting diode is only useful in small current rectification.
Additionally, they are suited for high-frequency applications due to reduced capacitance.
Fused Junction Diode
A pellet of impurity with p-type characteristics is heated with an n-type gem until they melt.
When they melt, they form a single structure with a p-n junction.
The method will also work when the impurity of n-type is heated alongside a p-type crystal.
The fused junction diode possesses a low maximum reverse breakdown voltage but with large current support.
The capacitance level at the junction is high.
Diffused Junction Diode
An n-type wafer is added impurities and heated to create a p-type layer by diffusion.
The p-n junction formed is cut into smaller bits.
Electrodes are made from metal and attached to the cut bits.
By being carried out on a large wafer, this process allows for the formation of several diodes at once.
Grown Junction Diode
A semiconducting material is melted, and p-type and n-type impurities added into it.
The p-type crystals are then pulled to form a layer overlaying the n-type.
This creates a large p-n junction piece. The piece is cut into smaller devices.
Larger pieces can accommodate larger currents but show increased capacitance. Diodes formed this way are well suited for low-frequency applications.
Planar Diffused Diode
A planar diffused diode originates from a fragile semiconductor material doped with high impurity levels.
This makes it an n-type necessitating the creation of a p-type region by diffusion.
Also, the p-region is formed before overlaying with an oxide layer that is photo-etched with aluminum to create contact. The reverse end is coated with metal to form a cathode.
Clearly, you can see there are many things you should learn before importing electronic diode.
However, if you have any questions or you need electronic diodes, Rantle team is here to help you.