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 Repetitive Peak Off-State Current Dimensions Length Width Height Maximum Operating Temperature
RS Stock No. 738-3248
Mfr. Part No.P3100SBLRP
BrandLittelfuse
$1.67
Each (In a Pack of 10)
units
- 4V 150mA 0.8A 275V 275V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 165-9870
Mfr. Part No.K2401GRP
BrandLittelfuse
$1.13
Each (On a Reel of 5000)
units
250V - 160mA 20A 190V 190V Through Hole DO-15 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm - +125 °C
RS Stock No. 738-3239
Mfr. Part No.P3100SCLRP
BrandLittelfuse
$1.85
Each (In a Pack of 10)
units
- 4V 150mA 0.8A 275V 275V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 793-1885
Mfr. Part No.K2401GRP
BrandLittelfuse
$2.31
Each (In a Pack of 5)
units
250V - 160mA 20A 190V 190V Through Hole DO-15 5µA 3.556 (Dia.) x 6.858mm 6.86mm 3.556 (Dia.)mm - +125 °C
RS Stock No. 738-3217
Mfr. Part No.P0080SALRP
BrandLittelfuse
$1.48
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 738-3242
Mfr. Part No.P0300SAMCLRP
BrandLittelfuse
$1.776
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 738-3258
Mfr. Part No.P0300SCLRP
BrandLittelfuse
$1.84
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 738-3254
Mfr. Part No.P0300SCMCLRP
BrandLittelfuse
$2.03
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 25V 25V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 738-3214
Mfr. Part No.P0080SCLRP
BrandLittelfuse
$1.85
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
RS Stock No. 738-3208
Mfr. Part No.P0080SAMCLRP
BrandLittelfuse
$1.65
Each (In a Pack of 10)
units
- 4V 50mA 0.8A 6V 6V Surface Mount DO-214AA (SMB) 0.005mA 4.6 x 3.95 x 2.45mm 4.6mm 3.95mm 2.45mm +150 °C
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