TRIACs

A TRIAC (triode for alternating current) is a silicone semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a development of a similar family member the thyristor. However, unlike the thyristor which is unidirectional the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional.
How does it work?
In basic terms a TRIAC is a low power 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. Once the gate current is triggered a TRIAC will continue to conduct even if the supply to the gate is removed.
A TRIAC is a 4 layer silicone 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 electronics applications and circuits.
Terminals
On the TRIAC symbol there are three terminals. These terminals are,
MT1 Anode 1 (Main Terminal 1)
MT2 Anode 2 (Main Terminal 2)
Gate Terminal
Applications
TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmers 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 177-5176
製造零件編號MAC15MG
BrandLittelfuse
HK$9.69
毎管:50 個
單位
15A Through Hole TO-220AB 35mA 600V 150A 3 1.5V 600V 40mA 10.28 x 4.82 x 9.28mm 10.28mm 4.82mm 9.28mm
RS庫存編號 545-0191
製造零件編號MAC15MG
BrandLittelfuse
HK$16.87
單位
15A Through Hole TO-220AB 35mA 600V 150A 3 1.5V 600V 40mA 10.28 x 4.82 x 9.28mm 10.28mm 4.82mm 9.28mm
RS庫存編號 102-4086
製造零件編號BTA40-800B
HK$61.72
個 (以毎袋:25)
單位
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS庫存編號 146-0829
製造零件編號BT134-600E,127
HK$2.608
毎管:50 個
單位
4A Through Hole SIP 25mA 600V 4A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS庫存編號 169-0637
製造零件編號BT136-600E,127
HK$3.071
毎管:50 個
單位
4A Through Hole TO-220AB 25mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS庫存編號 145-8700
製造零件編號BTB16-800BWRG
HK$9.247
毎管:50 個
單位
16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 793-1908
製造零件編號Q8025L6
BrandLittelfuse
HK$39.252
/個 (每包:5個)
單位
25A Through Hole TO-220AB 80mA 800V 250A 3 1.3V 800V 100mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS庫存編號 178-1478
製造零件編號BT138-800
HK$6.264
毎管:50 個
單位
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RS庫存編號 168-8107
製造零件編號BTA06-600BWRG
HK$4.686
毎管:50 個
單位
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 168-9600
製造零件編號BTA212-600B,127
HK$5.055
毎管:50 個
單位
12A Through Hole TO-220AB 50mA 600V 105A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS庫存編號 145-8613
製造零件編號BTA26-600BRG
HK$23.455
毎管:50 個
單位
25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS庫存編號 168-6660
製造零件編號TPDV1225RG
HK$73.366
毎管:30 個
單位
25A Through Hole TOP3 150mA 1200V 390A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS庫存編號 687-0990
製造零件編號TPDV1225RG
HK$77.74
單位
25A Through Hole TOP3 150mA 1200V 390A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS庫存編號 714-0515
製造零件編號BTA26-600BRG
HK$30.77
單位
25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS庫存編號 816-7820
製造零件編號BT139-800E
HK$5.17
/個 (每包:10個)
單位
20A Through Hole TO-220AB 25mA 800V 170A 3 1V 800V 45mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16mm
RS庫存編號 727-1120
製造零件編號BT136-600E,127
HK$3.738
/個 (每包:10個)
單位
4A Through Hole TO-220AB 25mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS庫存編號 284-905
製造零件編號BT134-600
HK$4.21
單位
25A Through Hole SOT-82 70mA 600V 27A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS庫存編號 829-3806
製造零件編號BTA06-600BWRG
HK$17.701
/個 (每包:10個)
單位
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 877-2649
製造零件編號BTB16-800BWRG
HK$12.496
/個 (每包:5個)
單位
16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 714-2603
製造零件編號BTA40-800B
HK$70.88
單位
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm