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What is a Switching Diode?

What is a Switching Diode?
Switching diodes are a single p-n diode in a discrete package. A switching diode provides the same functionality as a switch. It has high resistance below the specified applied voltage similar to an open switch, whereas above that voltage it changes in a sudden way to the low resistance of a closed switch. Switching diodes are used in devices such as ring modulation.

Types of Switching Diodes:
There are many different kinds of switching diodes. At Topdiode, we supply many of the most common types categorized by power dissipation, maximum reverse recovery time, maximum reverse voltage, maximum average forward current, packaging type and maximum peak current. The most common values for power dissipation are 200 mW, 250 mW, 350 mW and 500 mW. Please refer to our products page.

Applications for Switching Diodes:
The switching diode is the most basic function of almost every electronic application. Switching diodes are also used in high-speed rectifying applications, such as in radiofrequency receivers. Applications also include high-speed switching, general-purpose switching and reverse polarity protection in the consumer, automotive, and telecommunication industry.

Switching Diodes from Topdiode:

 

Small Signal Switching Diode

Average Forward Current


Peak Repetitive Reverse Voltage 

0.3A

 100V

1N4148 DO-35

LL4148 LL-34

1N4148W SOD-123

1N4148WS SOD-323


MCL4148 MicroMELF







Silicon Epitaxial Planar Switching Diode

Average Forward Current


BAV99 SOT-23

200mA

BAV70 SOT-23


What is a Bridge Rectifier?

What is a Bridge Rectifier?  

A bridge rectifier is an arrangement of four or more diodes in a bridge circuit configuration which provides the same output polarity for either input polarity. It is used for converting an alternating current (AC) input into a direct current (DC) output. A bridge rectifier provides full-wave rectification from a two-wire AC input, therefore resulting in lower weight and cost when compared to a rectifier with a 3-wire input from a transformer with a center-tapped secondary winding.
Types of Bridge Rectifiers
There are many different kinds of bridge rectifiers at Topdiode, we supply many of the most common types categorized by maximum average rectified current, maximum reverse voltage, maximum peak current, forward voltage, packaging type and maximum reverse current.
 The most common sizes for maximum average rectified current are 1A, 1.5 A, 4 A, 25 A and 35 A. We also carry bridge rectifiers with maximum average rectified current as high as 1000 A. Forward voltage can range from 450 mV to 1.1 kV, with the most common bridge rectifier semiconductor chips having a forward voltage of 1.1 V or 1 V.
Bridge Rectifiers from Topdiode.
 Applications for Bridge Rectifiers:
The primary application of bridge rectifiers is to transform an AC supply into DC power. All electronic devices require direct current, so bridge rectifiers are used inside the power supplies of almost all electronic equipment. Bridge rectifiers are also used for detecting the amplitude of modulated radio signals. The signal may be amplified before it is detected. If it is not, then a very low voltage drop diode or a diode biased with a fixed voltage must be used. Rectifiers are also used to supply polarized voltage for welding applications. Control of the output current is required in such circuits, and this may be achieved by replacing some of the diodes in a bridge rectifier with thyristors, which are diodes whose voltage output can be regulated by switching on and off with phase fired controllers.
Bridge Rectifier from Topdiode
Topdiode has a full selection of bridge rectifier chips that can be used to design a full wave bridge rectifier circuit, half wave rectifier or any other type of circuits that may require a bridge rectifier. 

Through-hole Bridge Rectifier (THT type)


Peak Repetitive Reverse Voltage   

50V

100V

200V

400V

600V

800V

1000V

Average Forward Current

0.5A



MB2M

MB4M

MB6M

MB8M

MB10M

1.0A

DB101

DB102

DB103

DB104

DB105

DB106

DB107

1.5A

DB151

DB152

DB153

DB154

DB155

DB156

DB157



D2SB20

D2SB40

D2SB60

D2SB80


2.0A

GBL201

GBL202

GBL203

GBL204

GBL205

GBL206

GBL207

KBP201

KBP202

KBP203

KBP204

KBP205

KBP206

KBP207

3.0A

KBP301

KBP302

KBP303

KBP304

KBP305

KBP306

KBP307

4.0A

GBL401

GBL402

GBL403

GBL404

GBL405

GBL406

GBL407

KBJ4A

KBJ4B

KBJ4D

KBJ4G

KBJ4J

KBJ4K

KBJ4M

D3SB05

D3SB10

D3SB20

D3SB40

D3SB60

D3SB80


GBU4A

GBU4B

GBU4D

GBU4G

GBU4J

GBU4K

GBU4M

6.0A

KBJ6A

KBJ6B

KBJ6D

KBJ6G

KBJ6J

KBJ6K

KBJ6M

GBU6A

GBU6B

GBU6D

GBU6G

GBU6J

GBU6K

GBU6M

8.0A

GBU8A

GBU8B

GBU8D

GBU8G

GBU8J

GBU8K

GBU8M

KBJ8A

KBJ8B

KBJ8D

KBJ8G

KBJ8J

KBJ8K

KBJ8M

10A

GBU10A

GBU10B

GBU10D

GBU10G

GBU10J

GBU10K

GBU10M

KBJ10A

KBJ10B

KBJ10D

KBJ10G

KBJ10J

KBJ10K

KBJ10M



















Surface Mount Bridge Rectifier (SMT type)

 


Peak Repetitive Reverse Voltage

50V

100V

200V

400V

600V

800V

1000V

Average Forward Current

0.5A



MB2S

MB4S

MB6S

MB8S

MB10S

0.8A



ABS2

ABS4

ABS6

ABS8

ABS10

1.0A

DB101S

DB102S

DB103S

DB104S

DB105S

DB106S

DB107S

1.5A

DB151S

DB152S

DB153S

DB154S

DB155S

DB156S

DB157S

Email: info@topdiode.com  MSN: topdiode@gmail.com   Skype: topdiode  Website:www.topdiode.com  

What is a Zener Diode?

What is a Zener Diode?

Zener diodes are a special kind of diode which permits current to flow in the forward direction. What makes them different from other diodes is that Zener diodes will also allow current to flow in the reverse direction when the voltage is above a certain value. This breakdown voltage is known as the Zener voltage. In a standard diode, the Zener voltage is high, and the diode is permanently damaged if a reverse current above that value is allowed to pass through it. Zener diodes are designed in a way where the Zener voltage is a much lower value. There is a controlled breakdown which does not damage the diode when a reverse current above the Zener voltage passes through a Zener diode.
Types of Zener Diodes
There are many different kinds of Zener diodes. Topdiode supply many of the most common types categorized by power dissipation, nominal working voltage, forward (drive) current, forward voltage, packaging type and maximum reverse current. The most common values for nominal working voltage are 5.1 V, 5.6 V, 6.2 V, 12 V and 15 V. Forward (drive) current can have a range from 200 uA to 200 A, with the most common forward (drive) current being 10 mA or 200 mA.
Applications for Zener Diodes
Zener diodes can be found in several applications. Some of these are: voltage stabilizers or regulators (in shunt mode), surge suppressors for device protection, peak clippers, switching operations, reference elements and in meter protection applications. The constant reverse voltage of a Zener diode renders it a very useful component in regulating the output voltage against variations in the load resistance or variations in the input voltage from an unregulated power supply. The current through the Zener diode will change in order to keep the voltage within the threshold limits of Zener action and the maximum power that it can dissipate.

Zener Diodes in Topdiode

Zener Diode 

Power dissipation

P/N

Voltage Range

500mW,1/2W

BZX55C2V7~47V DO-35

2.7V~47V

500mW,1/2W

BZV55C2V4~47V LL-34

2.4V~47V

1000mW, 1W

1N4729A~1N4756A DO-41

3.3V~100V

500mW

DL4728A ~DL4764A LL-41

3.3V~100V

0.35W

BZX84C3V0-47V

3V0~47V


What is a Fast Rectifier?

What is a Fast Rectifier?

Rectification is the most popular use for diodes. Fast rectifiers convert alternating current (AC) to direct current (DC). They only allow one-way flow of electrons. Rectifiers have many uses and are often found serving as components of high-voltage direct current power transmission systems and DC power supplies. Fast rectifier diodes feature very low reverse recovery time, very low switching losses and low noise turn-off switching.
Types of Fast Rectifiers
There are several different kinds of fast rectifiers. At Topdiode we offer many of the most common types categorized by maximum average rectified current, maximum reverse recovery time, maximum reverse current, maximum reverse voltage, packaging type and forward voltage. The most common sizes for forward voltage are 1.1 V, 1.2 V and 1.3 V.
 Applications for Fast Rectifiers:
Fast rectifier diodes are found in strobe applications that require high surge resistance as well as in the industrial, commercial and automotive sectors. High voltage resistance fast rectifier diodes, which are ideal for use in switching power supplies of all types, feature fast switching speeds along with improved efficiency and reduced loss. Fast rectifiers are also used in PDPs (sustain circuits) and PFC circuits. Also, detectors of radio signals serve as rectifiers.

Fast Recovery Rectifiers in Topdiode

Fast Recovery Diode


Peak Repetitive Reverse Voltage 

50V

100V

200V

400V

600V

800V

1000V


1.0A

1N4933

1N4934

1N4935

1N4936

1N4937






BA157

BA158

BA159D

BA159

FR101

FR102

FR103

FR104

FR105

FR106

FR107

1.5A

FR151

FR152

FR153

FR154

FR155

FR156

FR157

2.0A

FR201

FR202

FR203

FR204

FR205

FR206

FR207

2.5A

FR251

FR252

FR253

FR254

FR255

FR256

FR257

3.0A

FR301

FR302

FR303

FR304

FR305

FR306

FR307

5.0A

FR501

FR502

FR503

FR504

FR505

FR506

FR507

6.0A

FR601

FR602

FR603

FR604

FR605

FR606

FR607

Email: info@topdiode.com  MSN: topdiode@gmail.com   Skype: topdiode  Website:www.topdiode.com  

What is a Schottky Diode?

What is a Schottky Diode?

A Schottky diode, also known as a hot carrier diode, is a semiconductor diode which has a low forward voltage drop and a very fast switching action. There is a small voltage drop across the diode terminals when current flows through a diode. A normal diode will have a voltage drop between 0.6 to 1.7 volts, while a Schottky diode voltage drop is usually between 0.15 and 0.45 volts. This lower voltage drop provides better system efficiency and higher switching speed. In a Schottky diode, a semiconductor–metal junction is formed between a semiconductor and a metal, thus creating a Schottky barrier. The N-type semiconductor acts as the cathode and the metal side acts as the anode of the diode. This Schottky barrier results in both a low forward voltage drop and very fast switching.
Applications for Schottky Diodes:
Schottky diodes are useful in voltage clamping applications and prevention of transistor saturation due to the higher current density in the Schottky diode. Also, because of the low forward voltage drop in a Schottky diode, less energy is wasted as heat, therefore making them an efficient choice for applications that are sensitive to efficiency. Because of this, they are used in stand-alone photovoltaic systems in order to prevent batteries from discharging through the solar panels at night as well as in grid-connected systems containing multiple strings connected in parallel. Schottky diodes are also used as rectifiers in switched-mode power supplies. 

 Email: info@topdiode.com  MSN: topdiode@gmail.com   Skype: topdiode  Website:www.topdiode.com  

What is a Standard Rectifier?

What is a Standard Rectifier?


A rectifier diode lets electrical current flow in only one direction and is mainly used for power supply operation. Rectifier diodes can handle higher current flow than regular diodes and are generally used in order to change alternating current into direct current. They are designed as discrete components or as integrated circuits and are usually fabricated from silicon and characterized by a fairly large P-N-junction surface. This results in high capacitance under reverse-bias conditions. In high-voltage supplies, two rectifier diodes or more may be connected in series in order to increase the peak-inverse-voltage (PIV) rating of the combination.

Types of Standard Rectifiers
There are many different kinds of standard rectifiers and at Topdiode, we offer many of the most common types categorized by maximum reverse current, maximum peak current, maximum reverse voltage, forward voltage, packaging type and maximum average rectified current.

The most common sizes for maximum average rectified current are 1 A, 1.5 A, 3 A, 5 A and 6 A. We also carry standard rectifiers with maximum average rectified current as high as 400 A. Forward voltage can range from 1.1 mV to 1.3 kV, with the most common standard rectifier semiconductor chips having a forward voltage of 1.1 V or 1.15 V.

Applications for Standard Rectifiers:
Standard rectifiers can be found regulating the power in computers and the electrical power in motor vehicles. They can also be used in battery chargers for rechargeable batteries, computer power supplies and vehicle batteries. Also, while rectifier diodes are often used for AC to DC conversion, diodes with rectifying characteristics are found in other uses than in electronics. For example, a diode is used in the detector of radios in order to perform radio demodulation.

Standard diode rectifiers in Topdiode:

General Purpose Rectifier Diode


Peak Repetitive Reverse Voltage   


50V

100V

200V

300V

400V

500V

600V

800V

1000V

Average Forward Current

1.0A

M1

M2

M3


M4


M5

M6

M7

S1A

S1B

S1D


S1G


S1J

S1K

S1M

1A1

1A2

1A3


1A4


1A5

1A6

1A7

1N4001

1N4002

1N4003


1N4004


1N4005

1N4006

1N4007

1.5A

1N5391

1N5392

1N5393

1N5394

1N5395

1N5396

1N5397

1N5398

1N5399

GP15A

GP15B

GP15D


GP15G


GP15J

GP15K

GP15M

RL151

RL152

RL153


RL154


RL155

RL156

RL157

2.0A

RL201

RL202

RL203


RL204


RL205

RL206

RL207


S2A

S2B

S2D


S2G


S2J

S2K

S2M

2.5A

RL251

RL252

RL253


RL254


RL255

RL256

RL257

3.0A

1N5400

1N5401

1N5402

1N5403

1N5404

1N5405

1N5406

1N5407

1N5408


S3A

S3B

S3D


S3G


S3J

S3K

S3M

5.0A

5A05

5A1

5A2


5A4


5A6

5A8

5A10

6.0A

6A05

6A1

6A2


6A4


6A6

6A8

6A10

10.0A

10A05

10A1

10A2


10A3


10A6

10A8

10A10

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What is a Current Limiting Diode?

What is a Current Limiting Diode?

A current limiting diode, also known as a CLD, current regulating diode, diode connected transistor or constant current diode, regulates or limits current over a wide voltage range. Current limiting diodes consist of a JFET with the gate shorted to the source and function like a two-terminal current limiter or current source, much like voltage limiting Zener diodes. They allow a current passing through them to rise to a certain value and then level off at a specific value. Contrary to Zener diodes, these diodes keep the current constant instead of keeping the voltage constant. Current limiting diodes keep the current which is flowing through them unchanged when the voltage changes.
Applications for Current Limiting Diodes:
Current limiting diodes offer high performance and simplicity characteristics compared with bipolar transistors. They offer versatility in several circuit applications and superior performance regarding dynamic and impedance temperature drift. Some examples of devices using current limiting diodes are waveform generator circuits, timing circuits and battery chargers. Current limiting diodes can also be found as a constant current source for driving LEDs and can be used in order to replace holding coils in telephone connection devices.

Email: info@topdiode.com  MSN: topdiode@gmail.com   Skype: topdiode  Website:www.topdiode.com  

What is a schottky rectifiers?

What is a schottky rectifiers?

Schottky rectifiers have been used for several years in the power supply industry. The primary advantages are switching speeds that approach zero time and very low forward voltage drop. The reverse recovery time of Schottky diodes provides extremely fast recovery characteristics. What little reverse recovery time they exhibit is dictated by their capacitance instead of minority carrier recombination such as in conventional PN junction rectifiers. This offers very little reverse current overshoot when switching the Schottky from a forward conducting mode to a reverse blocking state.
Applications for Schottky Rectifiers:
Schottky rectifiers are ideal for output stages of switching power supplies. The very fast switching speed of Schottky rectifiers allows them to be used in very high frequency applications such as very low power signals and switching diode requirements of less than 100 picoseconds. Other applications include power management circuits and other various rectifier circuits.

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What is a Small Signal Diode?

What is a Small Signal Diode?


A small signal diode is a small non-linear semiconductor which is often used in electronic circuits where high frequencies or small currents are involved in television, radio and digital logic circuits. Small signal diodes are smaller in size compared to regular power diodes. The PN junction of a small signal diode is usually encapsulated in glass in order to protect it and generally has a black or red band at one end of its body identifying it as the cathode end of the terminal. Small signal diodes have lower current and power ratings in comparison to rectifier diodes but can function better in high frequency applications or in switching and clipping applications which deal with short-duration pulse waveforms.
Applications for Small Signal Diodes:
As previously mentioned, small signal diodes are often used in high frequency applications or in switching and clipping applications which deal with short-duration pulse waveforms. Small signal diodes are also found as a switch in rectifiers, snubbers, limiters, and wave-shaping circuits. Yet another application for small signal diodes is to create a regulated voltage supply where diodes are connected together in series in order to provide a constant DC voltage across the diode combination.

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What is a Tuning / Varactor Diode?

What is a Tuning / Varactor Diode?


A tuning diode, also known as a varactor diode, variable capacitance diode, varicap diode or variable reactance diode, is a diode that has a variable capacitance which is a function of the voltage that is impressed on its terminals. Tuning / varactor diodes are operated reverse-biased, and therefore no current flows. However, since the thickness of the depletion zone varies with the applied bias voltage, the capacitance of the diode can be made to vary. Usually, the capacitance is inversely proportional to the depletion region thickness and the depletion region thickness is proportional to the square root of the applied voltage. Therefore, the capacitance is inversely proportional to the square root of the voltage applied to the diode.

Applications for Tuning / Varactor Diodes:
Tuning / varactor diodes are often used in RF design. They provide a way of varying the capacitance within a circuit by applying a control voltage. Due to this capability, tuning / varactor diodes are widely used in the RF industry. They can be found in voltage controlled oscillators such as in a phase locked loop and are used in almost all radio, cellular and wireless receivers. They can also be found in RF filters for tuning purposes (for example, as tuners of television sets to electronically tune the receiver to different stations), parametric amplifiers, parametric oscillators and frequency synthesizers.

 Email: info@topdiode.com  MSN: topdiode@gmail.com   Skype: topdiode  Website:www.topdiode.com  

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