Thyristors

Thyristors are four-layer semiconductor devices, also known as a silicon controlled rectifier (SCR) It is like a fast static switch and is good for controlling large amounts of power, they can also control the speed of DC motors.

How do thyristors work?

Thyristors usually consist of three electrodes: an anode (positive terminal), Cathode (negative terminal) and a gate. (You can also get thyristors with two or four leads). The gate is the main control terminal while the main current flows between the anode and cathode Thyristors are made of N-type and P-type materials. The N-type material is formed by doping an element with electrons to increase the number of negative charge-carrying electrons. The P-type material is also produced through doping, although the resulting charge-carrying electrons are positively charged. By alternating layers of P and N-type material, a semiconductor thyristor device is formed. Thyristors are used to create a latching circuit. Thyristors can be turned on using the gate. It then turns off when the voltage across the anode-cathode drops back down to zero.

Types of thyristors

  • Silicon controlled rectifier (SCR) - The basic purpose of an SCR is to function as a switch that can turn on or off small or large amounts of power.
  • Silicon controlled switch (SCS) - Silicon Controlled Switch (SCS) is a device similar to an SCR, but it is designed to turn off when a positive voltage/input current pulse is applied to an additional "Anode gate".
  • Triac - Triac gets its name from Triode for alternating current Triacs are similar to SCRs but it conducts in both directions, (a bidirectional device). This means that it can switch AC and DC currents., Firing circuit commander modules are required for this.
  • Four-layer diode - A four-layer diode has 2 pins and is similar to a voltage-sensitive switch. When the voltage between the two pins exceeds the breakdown voltage it turns ON, otherwise its OFF.
  • Diac - Diac is a mix of the words diode and ac switch it is similar to a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

Applications of thyristors

Thyristors are commonly found in many everyday applications such as:

  • Motor speed controls
  • Pressure control systems
  • Light dimmers
  • Liquid level regulators

...
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Description Price Rated Average On-State Current Thyristor Type Package Type Repetitive Peak Reverse Voltage Current Rating Surge Current Rating Mounting Type Power Rating Maximum Gate Trigger Current Output Isolation Input Voltage AC Maximum Gate Trigger Voltage Input Voltage DC Maximum Holding Current
RS Stock No. 165-5407
Mfr. Part No.TT425N16KOFHPSA3
BrandInfineon
MYR1,204.055
Each (In a Tray of 2)
units
471A PCT Module 60mm 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
MYR8.01
Each
units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 355-2835
Mfr. Part No.TS420-600T
MYR4.22
Each
units
2.5A SCR TO-220AB 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 169-5956
Mfr. Part No.T70RIA120
BrandVishay
MYR132.874
Each (In a Box of 10)
units
70A SCR D 55 1200V - 1740A Panel Mount - 120mA - - 2.5V - 200mA
RS Stock No. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
MYR2.01
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 468-2353
Mfr. Part No.SKKH 106/12 E
BrandSemikron
MYR190.16
Each
units
106A SCR Module SEMIPACK1 1200V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6184
Mfr. Part No.SKKH 323/16 E
BrandSemikron
MYR813.67
Each
units
320A SCR SEMIPACK3 1600V - 9500A Panel Mount - 150mA - - 2V - 500mA
RS Stock No. 793-1920
Mfr. Part No.S6065KTP
BrandLittelfuse
MYR31.52
Each
units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 178-7029
Mfr. Part No.S6065KTP
BrandLittelfuse
MYR21.481
Each (In a Tube of 250)
units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 700-5585
Mfr. Part No.VS-25RIA120S90
BrandVishay
MYR93.78
Each
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 296-3981
Mfr. Part No.SKPC200-440
BrandSemikron
MYR749.50
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 457-4202
Mfr. Part No.EVR-25PA
MYR1,275.41
Each
units
- - - - 25A - Screw Mount - - - - - - -
RS Stock No. 195-3494
Mfr. Part No.AVR-25
MYR729.51
Each
units
- - - - - - Screw Mount - - 2500Vrms 230V ac - - -
RS Stock No. 905-6106
Mfr. Part No.SKKT 57/16 E
BrandSemikron
MYR157.36
Each
units
50A SCR A 46 1600V - 1500A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 195-3523
Mfr. Part No.STOM-1
MYR592.84
Each
units
- - - - - - Screw Mount - - 3500V 18V ac - - -
RS Stock No. 905-6128
Mfr. Part No.SKKT 92/16 E
BrandSemikron
MYR154.79
Each
units
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS Stock No. 839-1290
Mfr. Part No.TT425N16KOFHPSA3
BrandInfineon
MYR1,204.00
Each
units
471A PCT Module 60mm 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS Stock No. 271-814
Mfr. Part No.SKKT 92B16E
BrandSemikron
MYR263.66
Each
units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 177-5203
Mfr. Part No.C106DG
BrandLittelfuse
MYR1.45
Each (In a Box of 500)
units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 168-6080
Mfr. Part No.TS420-600T
MYR3.595
Each (In a Tube of 50)
units
2.5A SCR TO-220AB 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA