The is a specialized, three-layer, two-terminal semiconductor device designed specifically for switching applications, most notably in triggering TRIACs and Thyristors. It is often referred to as a "trigger diode." The DB2, like its counterparts the DB3 and DB4, plays a critical role in ac motor speed controls, lighting dimmers, and power control circuits by facilitating a precise, repeatable switching point.
(Leakage Current): The small current that flows through the DIAC before it breaks over ( Typically -40°C to +125°C. Tjcap T sub j
Excellent symmetry between forward and reverse conduction, ensuring balanced AC performance. 2. Core Technical Specifications diac db2 datasheet pdf 14 top
A key advantage of the DIAC is its symmetrical switching. The breakdown voltages for the positive and negative half-cycles of AC are nearly identical, with a tolerance typically within for the DB series. This ensures the TRIAC triggers evenly in both halves of the AC cycle, resulting in balanced power delivery to the load.
) passes through the device. The DIAC acts as an open switch. Breakover Point ( VBOcap V sub cap B cap O end-sub Tjcap T sub j Excellent symmetry between forward
(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
Comprehensive Engineering Guide to the DB2 DIAC: Architecture, Specifications, and Phase-Control Integration The breakdown voltages for the positive and negative
Unlike standard rectifying diodes that conduct current in a single direction, a DIAC functions as a bidirectional switch. The internal geometry features a multi-layer semiconductor configuration—typically a three-layer or five-layer layout—behaving identically under both forward and reverse voltage polarities.
Triggering TRIACs in lamp dimmers, motor speed controls, and heater controllers.
The (Diode for Alternating Current) is a bidirectional trigger diode commonly used in power control circuits, such as light dimmers and motor speed controllers. It acts as a switch that stays off until a specific "breakover voltage" is reached, at which point it suddenly conducts current in either direction.
This defines the thermal limits for safe operation and storage. A common range for these devices is . This wide range makes them suitable for use in a variety of environmental conditions.