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SIDACs, or more properly, silicon diodes for alternating current, primarily serve as pulse current ignition switches in metal halide lamps and xenon lights. The ac switches operate in a normally on manner, allowing low-voltage current to flow continuously. As a SIDAC heats during each cycle, the power thyristor generates a pulse that keeps gas in the lamp or bulb burning.
- Triggering voltages of 190 V ac to 380 V ac
- Low on-state voltages of 1 V ac to 15 V ac
- Typical on-state current of 1 A
- Glass passivated junctions
- RoHS compliant
- Available in surface mount and axial leaded configurations
- Available with unidirectional or bidirectional performance
- Produce multiple pulses in each half cycle at 50–60 Hz
- Blocking capability ensured by glass passivated junctions
- Also used in high-voltage power supplies and natural gas igniters
SIDAC Parts
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