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. 905-6093
Mfr. Part No.SKKT 57/12 E
BrandSemikron
HK$420.04
Each
units
- - G 12 1200V - 370A Panel Mount - - - - - - -
RS Stock No. 123-1459
Mfr. Part No.FS0809MD TR
HK$3.259
Each (In a Pack of 20)
units
8A SCR DPAK (TO-252) 600V - 70A Surface Mount - 15mA - - 1.3V - 40mA
RS Stock No. 165-5286
Mfr. Part No.TS110-8UF
HK$2.499
Each (On a Reel of 5000)
units
0.8A SCR SMB 800V - 21A Surface Mount - 100µA - - 0.8V - 12mA
RS Stock No. 188-8302
Mfr. Part No.TN1215-800G-TR
HK$7.35
Each (On a Reel of 1000)
units
12A SCR D2PAK - - 145A Surface Mount - 15mA - - - - 30mA
New
RS Stock No. 217-7240
Mfr. Part No.TT60N16SOFHPSA1
BrandInfineon
HK$138.954
Each (In a Tray of 12)
units
90A Diode - 1600V - - - - 100mA - - 2.5V - 250mA
RS Stock No. 825-2628
Mfr. Part No.N0465WN140
BrandIXYS
HK$828.44
Each
units
465A PCT - 1400 to 1600V - 5000A Screw Mount - 250mA - - 2.5V - 250mA
RS Stock No. 905-6099
Mfr. Part No.SKKT 42/16 E
BrandSemikron
HK$350.00
Each
units
40A SCR A 46 1600V - 1000A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 168-8904
Mfr. Part No.TYN612RG
HK$11.676
Each (In a Tube of 50)
units
8A SCR TO-220AB 600V - 145A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 509-601
Mfr. Part No.BT258X-500R,127
HK$4.536
Each (In a Pack of 10)
units
5A SCR TO-220F 500V - 82A Through Hole - 0.2mA - - 1.5V - 6mA
RS Stock No. 198-267
Mfr. Part No.MCO100-16IO1
BrandIXYS
HK$202.10
Each
units
99A SCR Module SOT-227B 1600V - 1.5kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 457-4195
Mfr. Part No.EVR-25BF
HK$2,222.36
Each
units
- - - - - - - - - - - - - -
RS Stock No. 792-0718
Mfr. Part No.BT151S-800R,118
HK$7.462
Each (In a Pack of 10)
units
7.5A SCR DPAK (TO-252) 800V - 132A Surface Mount - 15mA - - 1.5V - 20mA
RS Stock No. 169-5894
Mfr. Part No.16RIA100
BrandVishay
HK$134.704
Each (In a Bag of 100)
units
16A SCR TO-48 1000V - 360A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 168-4480
Mfr. Part No.MCD312-16IO1
BrandIXYS
HK$1,298.26
Each (In a Box of 3)
units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 687-0969
Mfr. Part No.P0102DN 5AA4
HK$7.456
Each (In a Pack of 5)
units
0.5A SCR SOT-223 400V - 8A Surface Mount - 0.2mA - - 0.8V - 5mA
New
RS Stock No. 217-7166
Mfr. Part No.ETD540N22P60HPSA1
BrandInfineon
HK$1,731.685
Each (In a Tray of 2)
units
542A Diode - 2200V - - - - 250mA - - 2.2V - 300mA
RS Stock No. 165-2886
Mfr. Part No.VS-110RKI120PBF
BrandVishay
HK$392.708
Each (In a Bag of 25)
units
110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
New
RS Stock No. 213-3413
Mfr. Part No.LX807MBRP
BrandLittelfuse
HK$3.226
Each (On a Reel of 1000)
units
0.8A - SOT-89 400 → 600V - - - - 3mA - - - - -
RS Stock No. 878-1842
Mfr. Part No.SK055R
BrandLittelfuse
HK$21.924
Each (In a Pack of 500)
units
55A SCR TO-220 1000V - 650A Through Hole - 40mA - - 1.5V - 60mA
RS Stock No. 877-3074
Mfr. Part No.TYN825RG
HK$26.01
Each (In a Pack of 5)
units
16A SCR TO-220AB 800V - 314A Through Hole - 40mA - - 1.3V - 50mA