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. 760-9272
Mfr. Part No.DCR780E14
BrandDynex
$159.05
Each
units
780A SCR Type G 1400V - 9100A Stud - 300mA - - 3V - 200mA
RS Stock No. 714-2643
Mfr. Part No.BTW69-800RG
$12.40
Each
units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 485-4283
Mfr. Part No.BT151-650R,127
$1.326
Each (In a Pack of 5)
units
7.5A SCR TO-220AB 650V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 102-3581
Mfr. Part No.BTW69-800RG
$10.689
Each (In a Tube of 30)
units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 214-4253
Mfr. Part No.SKKH 92/08 E
BrandSemikron
$118.97
Each
units
95A SCR Module SEMIPACK1 800V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 625-4988
Mfr. Part No.C106D1G
BrandLittelfuse
$1.17
Each
units
2.55A SCR TO-225 400V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 793-1920
Mfr. Part No.S6065KTP
BrandLittelfuse
$14.03
Each
units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 168-9625
Mfr. Part No.BT152-400R,127
$1.507
Each (In a Tube of 50)
units
13A SCR TO-220AB 450V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 146-1693
Mfr. Part No.MCC162-16IO1
BrandIXYS
$96.715
Each (In a Box of 6)
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 262-8335
Mfr. Part No.SKKH 92/16 E
BrandSemikron
$151.39
Each
units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 700-5617
Mfr. Part No.VS-P135
BrandVishay
$68.76
Each
units
25A SCR Module PACE-PAK 1200V - 0.375kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 493-077
Mfr. Part No.PR1-DIN-2.5KW
$93.93
Each
units
- - - - 11A - DIN Rail 2.5kW - - - - - -
RS Stock No. 509-471
Mfr. Part No.BT169D,112
$0.522
Each (In a Pack of 50)
units
0.5A SCR SPT 400V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 103-7543
Mfr. Part No.BT151-800R,127
$1.145
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 800V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 214-3963
Mfr. Part No.QVR-TB-RFI
$113.61
Each
units
- - - - - - Panel Mount - - - - - - -
RS Stock No. 165-9778
Mfr. Part No.BT151S-800R,118
$0.87
Each (On a Reel of 2500)
units
7.5A SCR DPAK (TO-252) 800V - 132A Surface Mount - 15mA - - 1.5V - 20mA
RS Stock No. 194-041
Mfr. Part No.MCC162-16IO1
BrandIXYS
$108.07
Each
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 168-4784
Mfr. Part No.N0795YN180
BrandIXYS
$118.175
Each (In a Box of 24)
units
795A PCT - 1000 to 1800V - 10500A Screw Mount - 150mA - - 2.50V - 300mA
RS Stock No. 877-3068
Mfr. Part No.TS820-600B-TR
$1.595
Each (In a Pack of 20)
units
5A SCR DPAK (TO-252) 600V - 73A Surface Mount - 200µA - - 0.8V - 5mA
RS Stock No. 262-8391
Mfr. Part No.SKKT 132/16 E
BrandSemikron
$189.81
Each
units
137A SCR Module SEMIPACK2 1600V - 4.7kA Panel Mount - 150mA - - 2V - 400mA