SIDACs

A SIDAC – Silicon Diode Alternating Current – is a discrete on/off switch that is used to control the output power of an electrical circuit. 


Differences between SIDACs and DIACs


SIDACs are similar to DIACs (three-layer diodes that conduct electrical current) because their operation is nearly identical. However, a SIDAC is a five-layer device. In general, it has a higher break-over voltage and greater current handling capacities. SIDACs can be used directly for switching and not simply for triggering another switching device. They’re commonly used in:

  • High voltage lamps
  • High voltage power supplies
  • Pulse generators
  • Fluorescent lighting 

How do SIDACs work?


SIDACs are widely used with TRIACs to improve the operation of your power switching system. 


They remain in a non-conducting state until the voltage across your device rises to a level above the break-over voltage. At this point the device starts to conduct. 


The device will continue to conduct until the voltage falls below its holding current, at which point the device will return to its non-conducting state. It will then conduct again once the break-over voltage is exceeded.


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Description Price Maximum Breakover Voltage Peak On-State Voltage Maximum Holding Current Surge Current Rating Repetitive Peak Reverse Voltage Repetitive Peak Forward Blocking Voltage Mounting Type Package Type Pin Count Repetitive Peak Off-State Current Dimensions Length Width Height
RS Stock No. 738-3239
Mfr. Part No.P3100SCLRP
BrandLittelfuse
TWD35
Each (In a Pack of 10)
units
- 4V 150mA 0.8A 275V 275V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3245
Mfr. Part No.P3100Q12BLRP
BrandLittelfuse
TWD47
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 878-1892
Mfr. Part No.K2400E70
BrandLittelfuse
TWD26
Each (In a Pack of 50)
units
250V 1.5V 150mA 20A - 190V Through Hole TO-92 3 5µA 4.73 x 3.68 x 4.98mm 4.73mm 3.68mm 4.98mm
RS Stock No. 738-3254
Mfr. Part No.P0300SCMCLRP
BrandLittelfuse
TWD44
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 793-1885
Mfr. Part No.K2401GRP
BrandLittelfuse
TWD47
Each (In a Pack of 5)
units
250V - 160mA 20A 190V 190V Through Hole DO-15 2 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm -
RS Stock No. 878-1889
Mfr. Part No.K2400G
BrandLittelfuse
TWD28,344
1 Pack of 1000
Pack(s)
250V 1.5V 150mA 20A - 190V Through Hole DO-15 2 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm -
RS Stock No. 878-1886
Mfr. Part No.K1200G
BrandLittelfuse
TWD21,717
1 Pack of 1000
Pack(s)
125V 1.5V 150mA 20A - 90V Through Hole DO-15 2 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm -
RS Stock No. 738-3210
Mfr. Part No.P0080SCMCLRP
BrandLittelfuse
TWD44
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3258
Mfr. Part No.P0300SCLRP
BrandLittelfuse
TWD41
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3217
Mfr. Part No.P0080SALRP
BrandLittelfuse
TWD26
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3220
Mfr. Part No.P3100SALRP
BrandLittelfuse
TWD17
Each (In a Pack of 10)
units
- 4V 150mA 0.8A 275V 275V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3248
Mfr. Part No.P3100SBLRP
BrandLittelfuse
TWD45
Each (In a Pack of 10)
units
- 4V 150mA 0.8A 275V 275V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3242
Mfr. Part No.P0300SAMCLRP
BrandLittelfuse
TWD27
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 878-1883
Mfr. Part No.K1200E70
BrandLittelfuse
TWD31,100
1 Pack of 2000
Pack(s)
125V 1.5V 150mA 20A - 90V Through Hole TO-92 3 5µA 4.73 x 3.68 x 4.98mm 4.73mm 3.68mm 4.98mm
New
RS Stock No. 165-9870
Mfr. Part No.K2401GRP
BrandLittelfuse
TWD31
Each (On a Reel of 5000)
units
250V - 160mA 20A 190V 190V Through Hole DO-15 2 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm -
RS Stock No. 738-3208
Mfr. Part No.P0080SAMCLRP
BrandLittelfuse
TWD24
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm
RS Stock No. 738-3214
Mfr. Part No.P0080SCLRP
BrandLittelfuse
TWD31
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 2 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm