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
New
RS Stock No. 213-3413
Mfr. Part No.LX807MBRP
BrandLittelfuse
MYR1.577
Each (On a Reel of 1000)
units
0.8A - SOT-89 400 → 600V - - - - 3mA - - - - -
RS Stock No. 166-1424
Mfr. Part No.BT169D,112
MYR0.42
Each (In a Bag of 1000)
units
0.5A SCR SPT 400V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 905-6099
Mfr. Part No.SKKT 42/16 E
BrandSemikron
MYR145.07
Each
units
40A SCR A 46 1600V - 1000A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 839-1222
Mfr. Part No.TDB6HK124N16RRBOSA1
BrandInfineon
MYR500.52
Each
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125A Diode Module 45mm 1600V - 650A PCB Mount - 150mA - - 2.5V - 200mA
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Mfr. Part No.TZ600N12KOFHPSA1
BrandInfineon
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Each
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600A PCT BG-PB501-1 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 168-4589
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BrandIXYS
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Each (In a Box of 6)
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216A Diode Y4 M6 1400V - 8.64kA PCB Mount - 220mA - - 3V - 150mA
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BrandIXYS
MYR225.623
Each (In a Box of 6)
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190A SCR Module Y4 M6 1200V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
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Mfr. Part No.VS-VSKT136/12PBF
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Each (In a Box of 15)
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135A IGBT INT-A-PAK 1200V - 3.36kA Panel Mount - 270mA - - 4V - 200mA
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MYR1.631
Each (In a Pack of 20)
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8A SCR TO-220AB 600V - 70A Through Hole - 15mA - - 1.3V - 40mA
New
RS Stock No. 213-3419
Mfr. Part No.SV6012L1TP
BrandLittelfuse
MYR7.067
Each (In a Tube of 50)
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12A SCR TO-220L 600V - - - - - - - - - -
RS Stock No. 165-5387
Mfr. Part No.DT61N12KOFHPSA1
BrandInfineon
MYR596.362
Each (In a Tray of 15)
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60A PCT Module 20mm 1200V - 1550A Panel Mount - 120mA - - 1.4V - 200mA
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Mfr. Part No.CM-FC36 (M/MV)
MYR960.17
Each
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- - - - - - - - - - - - - -
RS Stock No. 687-0943
Mfr. Part No.TN1215-600G-TR
MYR7.308
Each (In a Pack of 5)
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8A SCR D2PAK (TO-263) 600V - 145A Surface Mount - 15mA - - 1.3V - 30mA
RS Stock No. 714-2647
Mfr. Part No.P0102DA 1AA3
MYR1.40
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0.5A SCR TO-92 400V - 8A Through Hole - 0.2mA - - 0.8V - 5mA
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BrandIXYS
MYR96.99
Each
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100A SCR SOT-227B 1200V - 1.62kA Surface Mount - 80mA - - 1.6V - 100mA
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Mfr. Part No.T614FSE
MYR426.61
Each
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- - - - - - - - - - - - - -
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MYR389.14
Each
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- - - - - - - - - - - - - -
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MYR69.55
Each
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- - - - - - - - - - - - - -
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Mfr. Part No.NTE6404
MYR50.12
Each
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- - - - - - - - - - - - - -
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MYR317.80
Each
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