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 165-5059
製造零件編號FS0809MD TR
TWD11.90
個 (在毎卷:2500)
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8A SCR DPAK (TO-252) 600V - 70A Surface Mount - 15mA - - 1.3V - 40mA
RS庫存編號 123-1459
製造零件編號FS0809MD TR
TWD14.60
/個 (每包:20個)
單位
8A SCR DPAK (TO-252) 600V - 70A Surface Mount - 15mA - - 1.3V - 40mA
RS庫存編號 123-1460
製造零件編號FS0809MH TU
TWD10.50
/個 (每包:20個)
單位
8A SCR TO-220AB 600V - 70A Through Hole - 15mA - - 1.3V - 40mA
RS庫存編號 165-5044
製造零件編號FS0103MA
TWD2.30
個 (以毎袋:10000)
單位
0.8A SCR TO-92 600V - 7A Through Hole - 200µA - - 0.8V - 5mA
RS庫存編號 123-1464
製造零件編號FS2510MH TU
TWD18.20
/個 (每包:10個)
單位
25A SCR TO-220AB 600V - 300A Through Hole - 25mA - - 1.3V - 40mA
RS庫存編號 170-2392
製造零件編號FS0404MH TU
TWD13.20
毎管:50 個
單位
4A SCR TO-220AB 600V - 30A Through Hole - 50µA - - 0.8V - 5mA
RS庫存編號 170-2393
製造零件編號FS0809MH TU
TWD8.30
毎管:50 個
單位
8A SCR TO-220AB 600V - 70A Through Hole - 15mA - - 1.3V - 40mA
RS庫存編號 123-1466
製造零件編號FS5030QP00TU
TWD70.80
/個 (每包:5個)
單位
50A SCR TO-3P 1200V - - Through Hole - 80mA - - - - -
RS庫存編號 123-1462
製造零件編號FS1614MH TU
TWD19.50
/個 (每包:20個)
單位
16A SCR TO-220AB 600V - 190A Through Hole - 40mA - - 1.3V - 50mA
RS庫存編號 170-2395
製造零件編號FS1614MH TU
TWD21.10
毎管:50 個
單位
16A SCR TO-220AB 600V - 190A Through Hole - 40mA - - 1.3V - 50mA
RS庫存編號 123-1458
製造零件編號FS0404MH TU
TWD11.90
/個 (每包:20個)
單位
4A SCR TO-220AB 600V - 30 A @ 50 Hz, 33 A @ 60 Hz Through Hole - 50µA - - 0.8V - 5mA
RS庫存編號 123-1455
製造零件編號FS0103MA
TWD2.80
/個 (每包:100個)
單位
0.8A SCR TO-92 600V - 7A Through Hole - 200µA - - 0.8V - 5mA
RS庫存編號 123-1457
製造零件編號FS0402MH TU
TWD17.00
/個 (每包:20個)
單位
4A SCR TO-220AB 600V - 30A Through Hole - 200µA - - 0.8V - 5mA
RS庫存編號 170-2391
製造零件編號FS0402MH TU
TWD13.20
毎管:50 個
單位
4A SCR TO-220AB 600V - 30A Through Hole - 200µA - - 0.8V - 5mA
RS庫存編號 170-2394
製造零件編號FS1209NH TU
TWD16.50
毎管:50 個
單位
12A SCR TO-220AB 800V - 140A Through Hole - 15mA - - 1.3V - 30mA
RS庫存編號 170-2399
製造零件編號FS5030QP00TU
TWD56.10
毎管:30 個
單位
50A SCR TO-3P 1200V - - Through Hole - 80mA - - - - -
RS庫存編號 170-2396
製造零件編號FS2510MH TU
TWD14.40
毎管:50 個
單位
25A SCR TO-220AB 600V - 300A Through Hole - 25mA - - 1.3V - 40mA