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 262-494
製造零件編號BT139-600,127
HK$7.76
單位
16A Through Hole TO-220AB 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS庫存編號 177-7335
製造零件編號BTA212-600B,127
HK$7.49
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$33.96
毎管:30 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 774-3436
製造零件編號2N6073BG
BrandLittelfuse
HK$7.23
/個 (每包:5個)
單位
4A Through Hole TO-225 20mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS庫存編號 192-4932
製造零件編號T2050H-6G
HK$12.958
/個 (每包:5個)
單位
20A Surface Mount D2PAK 50mA 600V 210A 3 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS庫存編號 168-8852
製造零件編號ACST830-8GTR
HK$5.567
個 (在毎卷:1000)
單位
8A Surface Mount D2PAK (TO-263) 30mA 800V 84A 3 1V 800V 30mA 10.4 x 9.35 x 4.6mm 10.4mm 9.35mm 4.6mm
RS庫存編號 178-1432
製造零件編號BTA140-600,127
HK$12.26
毎管:50 個
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RS庫存編號 123-1470
製造零件編號FT0109MN RB
HK$0.938
/個 (每包:100個)
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1A Surface Mount SOT-223 10mA 600V - 3+Tab 1.3V 600V 10mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS庫存編號 165-7419
製造零件編號ACS102-6T1-TR
HK$1.753
個 (在毎卷:2500)
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- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS庫存編號 829-0466
製造零件編號BTB06-600CRG
HK$9.16
/個 (每包:10個)
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6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 168-8853
製造零件編號ACST410-8FP
HK$7.699
毎管:50 個
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4A Through Hole TO-220ABFP 10mA 800V 32A 3 1V 800V 20mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS庫存編號 168-6658
製造零件編號Z00607MA 5BL2
HK$1.931
個 (在毎卷:2000)
單位
0.8A Through Hole TO-92 7mA 600V 9.5A 3 1.3V 600V 5mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm
RS庫存編號 180-7189
製造零件編號VOM3052T
BrandVishay
HK$7.766
/個 (每包:10個)
單位
- Surface Mount SOP 10mA 6V 0.5A 4 - 600V 0.3mA 4.57 x 4.42 x 1.97mm 4.57mm 4.42mm 1.97mm
RS庫存編號 145-9207
製造零件編號BTA08-600CRG
HK$13.788
毎管:50 個
單位
8A Through Hole TO-220AB 50mA - - 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS庫存編號 795-9205
製造零件編號Z0109MN 5AA4
HK$2.853
/個 (每包:25個)
單位
1A Surface Mount SOT-223 10mA 600V 8.5A 3+Tab 1.3V - 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS庫存編號 121-6887
製造零件編號BCR20FM-12LB#BB0
HK$13.16
/個 (每包:2個)
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20A Through Hole TO-220FP 30mA 600V 200A 3 1.5V 600V - 10.16 x 4.7 x 15.87mm 10.16mm 4.7mm 15.87mm
RS庫存編號 168-8848
製造零件編號T810T-8FP
HK$13.882
毎管:50 個
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8A Through Hole TO-220ABFP 10mA 800V 63A 3 1.3V - 15mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS庫存編號 878-1895
製造零件編號Q6012LH5
BrandLittelfuse
HK$17.984
/個 (每包:10個)
單位
12A Through Hole TO-220 50mA 600V 120A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS庫存編號 171-0134
製造零件編號MAC4DCMT4G
BrandLittelfuse
HK$4.62
個 (在毎卷:2500)
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4A Surface Mount DPAK (TO-252) 35mA 600V 40A 3 1.3V 600V 35mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS庫存編號 102-3583
製造零件編號BTA10-600BWRG
HK$13.586
毎管:50 個
單位
10A Through Hole TO-220AB 50mA 800V 105A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm