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 166-1222
製造零件編號BT138B-800E,118
HK$4.795
個 (在毎卷:800)
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12A Surface Mount D2PAK (TO-263) 70mA 800V 105A 3 1.5V 800V 30mA 10.3 (Dia.) x 4.5mm - - 4.5mm
RS庫存編號 168-8604
製造零件編號T1650H-6I
HK$9.441
毎管:50 個
單位
16A Through Hole TO-220AB 50mA 600V 168A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 177-5185
製造零件編號MAC12SNG
BrandLittelfuse
HK$7.365
毎管:50 個
單位
12A Through Hole TO-220AB 5mA 800V 90A 3 1.5V 800V 10mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS庫存編號 168-6678
製造零件編號ACS120-7SB-TR
HK$4.616
個 (在毎卷:2500)
單位
- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS庫存編號 121-6884
製造零件編號BCR16CM-12LB#BB0
HK$20.52
/個 (每包:4個)
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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庫存編號 168-8856
製造零件編號BTA12-600TWRG
HK$8.003
毎管:50 個
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12A Through Hole TO-220AB 5mA 600V 126A 3 1.3V 600V 10mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 876-5730
製造零件編號T1210T-8FP
HK$12.312
/個 (每包:5個)
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12A Through Hole TO-220ABFP 10mA 800V 95A 3 1.3V - 15mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS庫存編號 168-6843
製造零件編號BTB08-600TWRG
HK$7.206
毎管:50 個
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8A Through Hole TO-220AB 5mA 600V 84A 3 1.3V 600V 10mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS庫存編號 178-1497
製造零件編號BTA16-600CRG
HK$8.116
毎管:50 個
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 145-9704
製造零件編號BTB08-600CWRG
HK$6.322
毎管:30 個
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8A Through Hole TO-220AB 35mA 600V 84A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 829-0416
製造零件編號BTA12-800CWRG
HK$11.836
/個 (每包:5個)
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12A Through Hole TO-220AB 35mA 800V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 177-5211
製造零件編號MAC15A8G
BrandLittelfuse
HK$12.062
個 (以毎盒:500)
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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 170-2414
製造零件編號FT2516MH TU
HK$6.61
毎管:50 個
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25A Through Hole TO-220AB 50mA 600V - 3 1.3V 600V 50mA 10.36 x 4.67 x 15.35mm 10.36mm 4.67mm 15.35mm
RS庫存編號 166-1221
製造零件編號BT139B-600,118
HK$5.149
個 (在毎卷:800)
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16A Surface Mount D2PAK (TO-263) 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS庫存編號 165-8513
製造零件編號BTA225-800B
HK$7.546
毎管:50 個
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25A Through Hole TO-220AB 50mA 800V 209A 3 1.5V 800V 60mA 10.3 x 4.5 x 15.8mm 10.3mm 4.5mm 15.8mm
RS庫存編號 169-0641
製造零件編號MAC97A6,412
HK$0.813
個 (以毎袋:1000)
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0.6A Through Hole SPT 7mA 400V 8.8A 3 2V 400V 10mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS庫存編號 791-7986
製造零件編號T635T-8T
HK$6.785
/個 (每包:10個)
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6A Through Hole TO-220AB 35mA 800V 47A 3 1.3V 800V 40mA 10.4 x 4.6 x 15.75mm 10.4mm 4.6mm 15.75mm
RS庫存編號 168-6842
製造零件編號BTB06-600TRG
HK$6.196
毎管:50 個
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6A Through Hole TO-220AB 5mA 600V 63A 3 1.5V 600V 15mA 10.5 x 4.82 x 9.02mm 10.5mm 4.82mm 9.02mm
RS庫存編號 145-9703
製造零件編號BTA16-800SWRG
HK$11.774
毎管:30 個
單位
16A Through Hole TO-220AB 10mA 800V 168A 3 1.3V 800V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 791-7983
製造零件編號T1635T-8T
HK$11.142
/個 (每包:5個)
單位
16A Through Hole TO-220AB 35mA 800V 126A 3 1.3V 800V 40mA 10.4 x 4.6 x 15.75mm 10.4mm 4.6mm 15.75mm