TRIACs

A TRIAC (triode for alternating current, also known as bidirectional triode thyristor or a bilateral triode thyristor) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a subset of thyristors and are similar to SCRs (silicon controlled rectifiers). However, unlike SCRs and other thyristors, which are unidirectional, the TRIAC is able to control current over both halves of the sine wave, making TRIACs bidirectional. A TRIAC is a 4-layer silicon component that is PNPN in the positive direction and NPNP in the negative direction. The devices come in panel mount, surface mount, and through-hole mounting options in various package types to suit a wide variety of electronics applications and circuits.RS Components have a curated range of TRIACs from a multitude of trusted brands, including Littelfuse, STMicroelectronics, WeEn Semiconductors Co., and many more.

How does a TRIAC work?

In basic terms, a TRIAC is a low-to-medium power semi-latching solid-state switch. The device acts like two standard thyristors inversely connected in parallel or back to back. To activate the component a voltage needs to be applied to the gate terminal, and TRIACs can be triggered by either negative or positive voltages, whereas SCRs require a positive voltage. Once the gate current is triggered, a TRIAC will continue to conduct even if the supply to the gate is removed.

On a TRIAC symbol, there are three terminals. These terminals are:

  • MT1 Anode 1 (Main Terminal 1)
  • MT2 Anode 2 (Main Terminal 2)
  • Gate Terminal

What are TRIACs used for?

TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmer switches, as they enable the utilisation of each half-cycle of the AC wave. The solid-state device can be used in a circuit as a simple on-off device in a wide range of electronic applications. Some of the more common areas are:

  • Temperature control
  • Liquid level control
  • Dimmers for domestic lighting
  • Small motor control
  • Speed control for electric fans

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Description Price Rated Average On-State Current Mounting Type Package Type Maximum Gate Trigger Current Repetitive Peak Reverse Voltage Surge Current Rating Pin Count Maximum Gate Trigger Voltage Repetitive Peak Forward Blocking Voltage Maximum Holding Current Dimensions Length Width Height
RS庫存編號 486-0957
製造零件編號BTB04-600SL
TWD30.80
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4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS庫存編號 168-6190
製造零件編號BTB04-600SL
TWD25.40
毎管:50 個
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4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS庫存編號 102-3532
製造零件編號BTA40-700B
TWD272.30
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40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS庫存編號 484-2741
製造零件編號BT136-600D,127
TWD23.60
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4A Through Hole TO-220AB 10mA 600V 27A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS庫存編號 169-3287
製造零件編號BTA40-700B
TWD316.00
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40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS庫存編號 102-3526
製造零件編號BTA16-600BWRG
TWD50.50
毎管:50 個
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS庫存編號 486-0907
製造零件編號BTA16-600BWRG
TWD59.40
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS庫存編號 166-1580
製造零件編號BT136S-800
TWD12.50
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4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS庫存編號 508-816
製造零件編號BT136S-800
TWD9.70
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4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS庫存編號 687-1031
製造零件編號T810-600B
TWD49.20
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8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS庫存編號 714-2558
製造零件編號BTA06-600CRG
TWD48.20
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6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 168-6669
製造零件編號T810-600B
TWD41.70
毎管:75 個
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8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS庫存編號 168-6837
製造零件編號BTA06-600CRG
TWD41.00
毎管:50 個
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6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 165-9777
製造零件編號BT137S-600D,118
TWD15.50
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8A Surface Mount DPAK (TO-252) 5mA 600V 71A 3 1V 600V 10mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS庫存編號 146-0398
製造零件編號BT139X-600F,127
TWD25.90
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16A Through Hole TO-220F 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.6 x 15.8mm 10.3mm 4.6mm 15.8 (With Tab)mm
RS庫存編號 177-5211
製造零件編號MAC15A8G
BrandLittelfuse
TWD31.20
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15A Through Hole TO-220AB 75mA 600V 150A 3 2.5V 600V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS庫存編號 880-5487
製造零件編號T835-600B-TR
TWD42.10
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8A Surface Mount DPAK (TO-252) 35mA 600V 80A 3 1.3V 600V 35mA 6.73 x 7.49 x 2.4mm 6.73mm 7.49mm 2.4mm
RS庫存編號 508-630
製造零件編號BT131-800,116
TWD4.90
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1A Through Hole SPT 7mA 800V 13.8A 3 1.5V 800V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS庫存編號 509-504
製造零件編號BT136X-600,127
TWD18.50
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4A Through Hole TO-220F 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS庫存編號 165-5580
製造零件編號T835-600B-TR
TWD19.40
個 (在毎卷:2500)
單位
8A Surface Mount DPAK (TO-252) 35mA 600V 80A 3 1.3V 600V 35mA 6.73 x 7.49 x 2.4mm 6.73mm 7.49mm 2.4mm