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 used in 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庫存編號 168-9404
製造零件編號BT151-500R,127
HK$4.099
毎管:50 個
單位
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS庫存編號 509-566
製造零件編號BT151-500R,127
HK$4.099
/個 (每包:10個)
單位
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS庫存編號 193-717
製造零件編號MCC95-16IO1B
BrandIXYS
HK$300.81
單位
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS庫存編號 862-4929
製造零件編號2N6508G
BrandLittelfuse
HK$10.485
/個 (每包:10個)
單位
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS庫存編號 177-5212
製造零件編號2N6508G
BrandLittelfuse
HK$13.033
個 (以毎盒:500)
單位
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS庫存編號 169-5899
製造零件編號22RIA40
BrandVishay
HK$95.404
個 (以毎袋:100)
單位
22A SCR TO-48 400V - 420A Thread Mount - 60mA - - 2V - 130mA
RS庫存編號 177-5352
製造零件編號MCC95-16IO1B
BrandIXYS
HK$304.784
個 (以毎盒:36)
單位
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS庫存編號 395-2831
製造零件編號VS-22RIA40
BrandVishay
HK$111.75
單位
22A SCR TO-48 400V - 420A Thread Mount - 60mA - - 2V - 130mA
RS庫存編號 841-924
製造零件編號PSR-25
HK$461.72
單位
- - - - 25A - Panel Mount 6kW - - - - - -
RS庫存編號 379-6518
製造零件編號PAC-2
HK$773.55
單位
- - - - - - Screw Mount - - 3500Vrms 250V ac - - -
RS庫存編號 122-1378
製造零件編號PR3-DIN-18kW
HK$1,281.34
單位
- - - - 25A - DIN Rail 18kW - - - - - -
RS庫存編號 668-7016
製造零件編號MCC56-12io1B
BrandIXYS
HK$208.98
單位
64A SCR Module TO-240AA 1200V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS庫存編號 169-5843
製造零件編號VSKT250-12PBF
BrandVishay
HK$1,175.08
個 (以毎盒:2)
單位
250A SCR MAGN-A-PAK 1200V - 8.9kA Panel Mount - 350mA - - 4V - 500mA
RS庫存編號 227-9236
製造零件編號VS-VSKT250-12PBF
BrandVishay
HK$1,196.88
單位
250A SCR MAGN-A-PAK 1200V - 8.9kA Panel Mount - 350mA - - 4V - 500mA
RS庫存編號 177-5360
製造零件編號MCC56-12IO1B
BrandIXYS
HK$211.741
個 (以毎盒:36)
單位
64A SCR Module TO-240AA 1200V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS庫存編號 905-6128
製造零件編號SKKT 92/16 E
BrandSemikron
HK$650.70
單位
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS庫存編號 103-2939
製造零件編號2N6507G
BrandLittelfuse
HK$13.033
個 (以毎盒:500)
單位
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS庫存編號 165-2437
製造零件編號VS-ST083S08PFM1P
BrandVishay
HK$700.864
個 (以毎袋:25)
單位
85A SCR TO-94 800V - 2560A Thread Mount - 200mA - - 3V - 600mA
RS庫存編號 878-1653
製造零件編號Q4016LH6
BrandLittelfuse
HK$12.072
/個 (每包:500個)
單位
16A TRIAC TO-220 400V - 200A Through Hole - 80mA - - 1.3V - 70mA
RS庫存編號 493-077
製造零件編號PR1-DIN-2.5KW
HK$471.64
單位
- - - - 11A - DIN Rail 2.5kW - - - - - -