This article provides a comprehensive overview of the , a critical bidirectional trigger diode used in AC power control. While modern designs often favor the DB3 series (32V), the DB2 remains a staple in specific timing and triggering circuits. 1. DB2 DIAC Datasheet Overview
Having these 14 parameters in a single PDF datasheet gives an engineer all the information needed to design with the DB2.
Understanding the technical nuances of the DB2 through its official PDF documentation is essential for designing reliable light dimmers, motor speed controllers, and ballast systems. This comprehensive guide covers the technical specifications, electrical parameters, and top design use cases found in the . Functional Overview and Operating Mechanism diac db2 datasheet pdf 14 top
The DB2 (or its electrical equivalents) is used wherever a is required. Typical circuits include:
Before diving into the datasheet specifics, let’s establish a baseline. A DIAC is a bidirectional trigger diode. Unlike a standard diode, it conducts current only after its (VBO) is exceeded in either direction. Once triggered, it exhibits negative resistance, dropping the voltage across it and allowing a surge of current to fire a TRIAC gate. This article provides a comprehensive overview of the
(Breakover Voltage) - Minimum: The minimum voltage at which the DIAC starts conducting (typically 25V for many DB2 variations). VBOcap V sub cap B cap O end-sub
Based on standard manufacturer data, the DB2 typically features the following electrical ratings: Typical Value VBOcap V sub cap B cap O end-sub 28 – 36 (32 typical) Breakover Voltage Symmetry Breakover Current IBOcap I sub cap B cap O end-sub 50 – 100 Repetitive Peak On-State Current ITRMcap I sub cap T cap R cap M end-sub Power Dissipation PDcap P sub cap D Operating Temperature Tjcap T sub j -40 to +125 Sources: Features & Characteristics Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics DB2 DIAC Datasheet Overview Having these 14 parameters
The DB2 is most commonly supplied in a (similar to a 1N4148 signal diode). Leads are interchangeable (no polarity marking). Typical dimensions: body length ~4.5 mm, diameter ~2.0 mm, overall length with leads ~50 mm.
: Used in light dimmers, motor speed controls, and fluorescent lamp ballasts.
Beyond the statistical datasheet values, engineering wisdom dictates another "14 Top" – the top 14 design considerations when using the DB2 in real products.