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. 124-3655
FabrikantnummerBCR20CM-12LB#BB0
1,528 €
Each (In a Pack of 5)
Aantal stuks
20A Through Hole TO-220AB 30mA 600V 200A 3 1.5V 600V - 9.9 x 4.5 x 15.7mm 9.9mm 4.5mm 15.7mm
RS-stocknr. 124-3657
FabrikantnummerBCR3AM-14B#B00
0,842 €
Each (In a Pack of 5)
Aantal stuks
3A Through Hole TO-92 30mA - 30A 3 1.5V 800V - 5 x 3.6 x 5mm 5mm 3.6mm 5mm
RS-stocknr. 124-3658
FabrikantnummerBCR3FM-12RB#BB0
0,89 €
Each (In a Pack of 5)
Aantal stuks
3A Through Hole TO-220FP 15mA - 30A 3 1.5V 600V - 10.16 x 4.7 x 15.87mm 10.16mm 4.7mm 15.87mm
RS-stocknr. 124-3664
FabrikantnummerBCR8PM-12LG1AS#B00
0,95 €
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220F 30mA - 80A 3 1.5V 600V - 10.5 x 4.5 x 17mm 10.5mm 4.5mm 17mm
RS-stocknr. 121-6886
FabrikantnummerBCR1AM-12A-A6#C01
0,72 €
Each (In a Pack of 10)
Aantal stuks
1A Through Hole TO-92 7mA 600V 10A 3 2V 600V - 5 x 3.6 x 5mm 5mm 3.6mm 5mm
RS-stocknr. 121-6884
FabrikantnummerBCR16CM-12LB#BB0
1,41 €
Each (In a Pack of 4)
Aantal stuks
16A Through Hole TO-220AB 30mA 600V 170A 3 1.5V 600V - 9.9 x 4.5 x 15.7mm 9.9mm 4.5mm 15.7mm
RS-stocknr. 124-3650
FabrikantnummerBCR08AM-14A#B00
0,355 €
Each (In a Pack of 10)
Aantal stuks
0.8A Through Hole TO-92 5mA - 8A 3 2V 700V - 5 x 3.6 x 5mm 5mm 3.6mm 5mm
RS-stocknr. 124-3660
FabrikantnummerBCR3PM-12LA#B00
1,00 €
Each (In a Pack of 5)
Aantal stuks
3A Through Hole TO-220F 20mA - 30A 3 1.5V 600V - 10.5 x 4.5 x 17mm 10.5mm 4.5mm 17mm
RS-stocknr. 124-3663
FabrikantnummerBCR8PM-12LG1A8#B00
0,972 €
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220F 30mA - 80A 3 1.5V 600V - 10.5 x 4.5 x 17mm 10.5mm 4.5mm 17mm
RS-stocknr. 124-3653
FabrikantnummerBCR16LM-14LB#B00
1,324 €
Each (In a Pack of 5)
Aantal stuks
16A Through Hole TO-220FL 30mA - 160A 3 1.5V 800V - 10 x 4.5 x 15mm 10mm 4.5mm 15mm
RS-stocknr. 121-6888
FabrikantnummerBCR5AS-12A-T13#B00
0,75 €
Each (In a Pack of 4)
Aantal stuks
5A Surface Mount MP 3A 30mA 600V 50A 3+Tab 1.5V 600V - 6.6 x 6.1 x 2.3mm 6.6mm 6.1mm 2.3mm
RS-stocknr. 124-3659
FabrikantnummerBCR3FM-12RB#GA1
0,808 €
Each (In a Pack of 5)
Aantal stuks
3A Through Hole TO-220FP 15mA - 30A 3 1.5V 600V - 10.16 x 4.7 x 15.87mm 10.16mm 4.7mm 15.87mm
RS-stocknr. 124-3651
FabrikantnummerBCR12FM-14LJ#BB0
1,118 €
Each (In a Pack of 5)
Aantal stuks
12A Through Hole TO-220FP 30mA - 120A 3 1.5V 800V - 10.16 x 4.7 x 15.87mm 10.16mm 4.7mm 15.87mm