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庫存編號 714-2640
製造零件編號BTW69-1200RG
HK$71.88
單位
32A SCR TOP3 1200V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS庫存編號 102-3580
製造零件編號BTW69-1200RG
HK$66.486
毎管:30 個
單位
32A SCR TOP3 1200V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS庫存編號 103-1577
製造零件編號TYN1012RG
HK$18.333
毎管:50 個
單位
8A SCR TO-220AB 1000V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS庫存編號 714-2669
製造零件編號TYN1012RG
HK$21.568
/個 (每包:5個)
單位
8A SCR TO-220AB 1000V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS庫存編號 829-6858
製造零件編號BTW69-1200N
HK$53.98
單位
31A SCR TOP3 1200V - 763A Through Hole - 50mA - - 1.3V - 100mA
RS庫存編號 687-1053
製造零件編號TYN610RG
HK$14.29
/個 (每包:5個)
單位
6.4A SCR TO-220AB 600V - 105A Through Hole - 15mA - - 1.5V - 30mA
RS庫存編號 168-6673
製造零件編號TYN610RG
HK$12.353
毎管:50 個
單位
6.4A SCR TO-220AB 600V - 105A Through Hole - 15mA - - 1.5V - 30mA
RS庫存編號 188-8524
製造零件編號TN2540-600G-TR
HK$22.252
/個 (每包:5個)
單位
25A SCR D2PAK - - 314A Surface Mount - 40mA - - - - 50mA
RS庫存編號 687-1019
製造零件編號TYN640RG
HK$24.705
/個 (每包:2個)
單位
25A SCR TO-220AB 600V - 480A Through Hole - 35mA - - 1.3V - 75mA
RS庫存編號 206-8638
製造零件編號TN6050HP-12WY
HK$45.19
/個 (每包:2個)
單位
38 SCR TO-247 1200V - 600A - - 50mA - - - - -
RS庫存編號 687-0943
製造零件編號TN1215-600G-TR
HK$15.004
/個 (每包:5個)
單位
8A SCR D2PAK (TO-263) 600V - 145A Surface Mount - 15mA - - 1.3V - 30mA
RS庫存編號 202-5575
製造零件編號TN3015H-6G
HK$9.618
/個 (每包:10個)
單位
- - - - 30A - Surface Mount 18kW - - - - - -
RS庫存編號 829-0469
製造零件編號TXN625RG
HK$26.646
/個 (每包:5個)
單位
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS庫存編號 687-0962
製造零件編號X0202MN 5BA4
HK$4.286
/個 (每包:5個)
單位
0.8A SCR SOT-223 600V - 25A Surface Mount - 0.2mA - - 0.8V - 5mA
RS庫存編號 714-2643
製造零件編號BTW69-800RG
HK$68.91
單位
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS庫存編號 168-7901
製造零件編號TYN412RG
HK$11.057
毎管:50 個
單位
12A SCR TO-220 - - 145A Through Hole - 15mA - - 1.3V - 30mA
RS庫存編號 877-3147
製造零件編號X0202MA 2BL2
HK$5.786
/個 (每包:20個)
單位
0.8A SCR TO-92 600V - 25A Through Hole - 200µA - - 0.8V - 5mA
RS庫存編號 687-1022
製造零件編號X0405MF 1AA2
HK$6.917
/個 (每包:10個)
單位
0.9A SCR TO-202 600V - 33A Through Hole - 0.05mA - - 0.8V - 5mA
RS庫存編號 163-9738
製造零件編號TN1605H-6G-TR
HK$8.902
/個 (每包:10個)
單位
10A SCR D2PAK 600V - 153A Surface Mount - 6mA - - 1.3V - 20mA
RS庫存編號 202-5570
製造零件編號TN2010H-6I
HK$8.274
毎管:50 個
單位
- - - - 20A - Surface Mount 12kW - - - - - -