A TRIAC is like a heavy iron gate; it takes a strong, sharp kick to open it. If you tried to tickle it with a gentle voltage, it would hesitate, stutter, and turn on only partially. In the world of electronics, this hesitation was called "snapback," and to a human eye, it resulted in lights that flickered nervously and motors that hummed angrily.
Once breakdown occurs, the device exhibits a strong negative resistance characteristic. The voltage across the DIAC drops abruptly to its on-state level, triggering an instantaneous pulse of current ( IPcap I sub cap P
) enclosed in a hermetically sealed case. Unlike a standard asymmetric diode, the DIAC exhibits identical, symmetrical electrical characteristics in both the forward and reverse directions.
This comprehensive technical analysis unpacks the critical parameters found within the device's technical documentation and details the where the DB2 DIAC excels. Technical Specifications: Anatomy of a DB2 Datasheet
If you cannot locate a DB2, consider these options:
