Thyristors - DIACs, SIDACs

Thyristors - DIACs, SIDACs

Definition:
Thyristors - DIACs (Diode for Alternating Current) and SIDACs (Silicon Diode for Alternating Current) are specialized discrete semiconductor devices designed for controlling and switching AC power. DIACs are bidirectional trigger diodes used primarily to activate TRIACs or other thyristors in AC circuits, ensuring precise voltage threshold triggering. SIDACs, on the other hand, are high-voltage bidirectional switches capable of handling larger currents and voltages, often employed in surge protection and ignition systems. Both devices play critical roles in power regulation, phase control, and circuit protection applications.

Product Types:
This category includes:
1. DIACs: Low-power triggering devices with symmetric or asymmetric breakover voltages, ideal for phase control in dimmers, motor speed controllers, and light-activated switches.
2. SIDACs: High-voltage switches with latching behavior, commonly used in surge suppressors, pulse generators, and industrial ignition systems.
3. Combination Modules: Integrated solutions pairing DIACs/SIDACs with TRIACs or other thyristors for simplified circuit design.

Purchasing Recommendations:
When selecting DIACs or SIDACs, consider:
- Voltage Ratings: Ensure the breakover voltage (VBO) matches your circuit s requirements. DIACs typically range from 20V to 40V, while SIDACs support higher voltages (100V+).
- Current Handling: Verify peak current (Ipeak) and holding current (Ih) specifications for compatibility with load conditions.
- Packaging: Choose through-hole or surface-mount (SMD) options based on assembly methods.
- Application-Specific Needs: For surge protection, prioritize SIDACs with fast response times; for precision triggering, opt for low-tolerance DIACs.

As critical components in AC power control, DIACs and SIDACs demand careful selection to balance performance, reliability, and cost. Partner with trusted suppliers to ensure compliance with industry standards like IEC or AEC-Q101 for automotive-grade applications.