TRIACs

A TRIAC (triode for alternating current) is a three terminal device that allows current to flow in either direction when triggered. It acts like a pair of silicon controlled rectifiers inversely parallel to each other.
How do they work?
Being a sub-set of thyristors, TRIACs have a similar mode of operation, in that to be turned on a voltage needs to be applied to the gate. Once triggered, a TRIAC will continue to conduct, even if the gate voltage ceases, until the current drops below a certain level. This is called the holding current.
Because TRIACs are bidirectional and can allow current to flow in either direction, they can be very useful in AC applications. In an AC circuit, a unidirectional device, such as a silicon controlled rectifier, will only conduct in one half of the cycle, delivering only half of the power.
Uses:
● Light Dimming
● Electric motor speed control
● Domestic appliance control circuits

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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 Stock No. 486-0957
Mfr. Part No.BTB04-600SL
TWD25
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-6190
Mfr. Part No.BTB04-600SL
TWD16
Each (In a Tube of 50)
units
4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 486-0907
Mfr. Part No.BTA16-600BWRG
TWD71
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
TWD19
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 600V 27A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 102-3532
Mfr. Part No.BTA40-700B
TWD210
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 169-3287
Mfr. Part No.BTA40-700B
TWD274
Each
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 102-3526
Mfr. Part No.BTA16-600BWRG
TWD30
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 793-1891
Mfr. Part No.Q6015L5
BrandLittelfuse
TWD74
Each (In a Pack of 5)
units
15A Through Hole TO-220AB 50mA 600V 200A 3 2V 600V 70mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 714-2558
Mfr. Part No.BTA06-600CRG
TWD41
Each (In a Pack of 5)
units
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 Stock No. 165-5571
Mfr. Part No.T810-600B-TR
TWD19
Each (On a Reel of 2500)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm
RS Stock No. 508-816
Mfr. Part No.BT136S-800
TWD10
Each (In a Pack of 10)
units
4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 687-1031
Mfr. Part No.T810-600B
TWD42
Each (In a Pack of 5)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 166-1580
Mfr. Part No.BT136S-800
TWD13
Each (On a Reel of 2500)
units
4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 168-6669
Mfr. Part No.T810-600B
TWD25
Each (In a Tube of 75)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 877-3034
Mfr. Part No.T810-600B-TR
TWD25
Each (In a Pack of 10)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm
RS Stock No. 168-6837
Mfr. Part No.BTA06-600CRG
TWD20
Each (In a Tube of 50)
units
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 Stock No. 123-1479
Mfr. Part No.FT0816MD TR
TWD14
Each (In a Pack of 20)
units
8A Surface Mount DPAK (TO-252) 50mA 600V - 3 1.3V 600V 50mA 6.73 x 6.22 x 2.39mm 6.73mm 6.22mm 2.39mm
RS Stock No. 508-630
Mfr. Part No.BT131-800
TWD6
Each (In a Pack of 20)
units
1A Through Hole SPT 7mA 800V 13.8A 3 1.5V 800V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
New
RS Stock No. 145-9207
Mfr. Part No.BTA08-600CRG
TWD14
Each (In a Tube of 50)
units
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 Stock No. 509-504
Mfr. Part No.BT136X-600,127
TWD9
Each (In a Pack of 10)
units
4A Through Hole TO-220F 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm