The DB2 DIAC is a specialized bidirectional trigger diode frequently used in AC power control circuits, such as light dimmers and motor speed controllers. While modern datasheets often focus on the more common DB3 or DB4 variants, the DB2 remains a key reference for lower-voltage triggering applications. Core Technical Specifications
This paper provides a comprehensive technical overview of the DB2 series component. While often confused with a Diac (Diode for Alternating Current) due to nomenclature similarities, the DB2 is a standard single-phase silicon bridge rectifier. This document analyzes its electrical characteristics, thermal properties, mechanical dimensions, and common applications in power supply circuits. Diac Db2 Datasheet Pdf 14
While you should always verify with the official DIAC DB2 Datasheet for your specific manufacturer, typical parameters include: Breakover Voltage ( VBOcap V sub cap B cap O end-sub ): Generally ranges between 28V and 36V. Breakover Current ( IBOcap I sub cap B cap O end-sub ): Typically max 50 µA. Peak Pulse Current ( ITRMcap I sub cap T cap R cap M end-sub ): Usually around 2A for a short duration ( Operating Junction Temperature ( Tjcap T sub j ): -40negative 40 +125positive 125 Common Applications The DB2 DIAC is a specialized bidirectional trigger
Light Dimmers: Controlling the phase of the AC power to vary brightness. DB3: Breakover voltage approx
The DB2 is often grouped with similar models like the DB3 or DB4, but it has distinct electrical parameters optimized for triggering. Typical Value / Range Breakover Voltage ( VBOcap V sub cap B cap O end-sub ) 28V to 36V (typically 32V) Breakover Current ( IBOcap I sub cap B cap O end-sub ) Maximum 50µA to 100µA Peak Pulse Current ( ITRMcap I sub cap T cap R cap M end-sub ) Output Voltage ( VOcap V sub cap O ) Minimum 5V Rise Time ( ) Maximum 1.5µs to 2µs Operating Temperature -40°C to +125°C Key Features STMicroelectronicshttps://www.st.com Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics