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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Omschrijving Prijs 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-stocknr. 166-1265
FabrikantnummerBT137B-800F,118
€ 0,258
Each (On a Reel of 800)
Aantal stuks
8A Surface Mount D2PAK (TO-263) 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS-stocknr. 792-0728
FabrikantnummerBTA204S-800E,118
€ 0,518
Each (On a Tape of 10)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 800V 27A 3 1.5V 800V 12mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS-stocknr. 145-9248
FabrikantnummerBTB12-600BWRG
€ 1,091
Each (In a Tube of 30)
Aantal stuks
12A Through Hole TO-220AB 50mA 800V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 145-9608
FabrikantnummerBTB08-600BWRG
€ 0,939
Each (In a Tube of 30)
Aantal stuks
8A Through Hole TO-220AB 50mA 600V 84A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 829-0349
FabrikantnummerBTB12-600BWRG
€ 1,246
Each (In a Pack of 5)
Aantal stuks
12A Through Hole TO-220AB 50mA 800V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 795-8704
FabrikantnummerZ0103MN 5AA4
€ 0,265
Each (In a Pack of 10)
Aantal stuks
1A Surface Mount SOT-223 5mA 600V 8.5A 3+Tab 1.3V - 7mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS-stocknr. 124-2436
FabrikantnummerZ0103MN,135
€ 0,101
Each (On a Reel of 4000)
Aantal stuks
1A Surface Mount SOT-223 (SC-73) 5mA 600V 8.5A 4 1.3V 600V 7mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS-stocknr. 714-0502
FabrikantnummerBTA16-600BRG
€ 1,435
Each (In a Pack of 2)
Aantal stuks
16A Through Hole TO-220AB 100mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 165-6859
FabrikantnummerZ0103MN 5AA4
€ 0,097
Each (On a Reel of 1000)
Aantal stuks
1A Surface Mount SOT-223 5mA 600V 8.5A 3+Tab 1.3V - 7mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS-stocknr. 687-1029
FabrikantnummerBTA24-600BWRG
€ 2,185
Each (In a Pack of 2)
Aantal stuks
25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 168-6668
FabrikantnummerBTA24-600BWRG
€ 1,845
Each (In a Tube of 50)
Aantal stuks
25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 727-1133
FabrikantnummerZ0103MN,135
€ 0,289
Each (In a Pack of 20)
Aantal stuks
1A Surface Mount SOT-223 (SC-73) 5mA 600V 8.5A 4 1.3V 600V 7mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS-stocknr. 714-2628
FabrikantnummerBTB08-600BWRG
€ 1,11
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220AB 50mA 600V 84A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 165-9777
FabrikantnummerBT137S-600D,118
€ 0,381
Each (On a Reel of 2500)
Aantal stuks
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-stocknr. 714-2612
FabrikantnummerBTB06-600BWRG
€ 1,028
Each (In a Pack of 5)
Aantal stuks
6A Through Hole TO-220AB 50mA 600V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 165-7646
FabrikantnummerZ0410MF 1AA2
€ 0,453
Each (In a Bag of 250)
Aantal stuks
4A Through Hole TO-202 25mA 600V 21A 3 1.3V 600V 25mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 127-0654
FabrikantnummerBTA40-600B
€ 7,13
Each
Aantal stuks
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS-stocknr. 714-2558
FabrikantnummerBTA06-600CRG
€ 1,188
Each (In a Pack of 5)
Aantal stuks
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-stocknr. 102-3582
FabrikantnummerBTB10-600BWRG
€ 0,871
Each (In a Tube of 50)
Aantal stuks
10A Through Hole TO-220AB 50mA 600V 105A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 714-2653
FabrikantnummerT410-600B
€ 0,821
Each (In a Pack of 10)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm