Diac Db2 Datasheet Pdf 14 Top
Understanding the DIAC DB2: Datasheet Breakdown, Technical Specifications, and Applications
): Up to for short, repetitive pulses (typically measured with a pulse width of Operating Junction Temperature ( Tjcap T sub j ): Operates reliably across a broad thermal envelope from -40∘Cnegative 40 raised to the composed with power C +125∘Cpositive 125 raised to the composed with power C . 3. Top 14 Key Sections in a Standard DIAC Datasheet
This is by far the most common application. In a standard light dimmer, a DIAC is used to trigger a TRIAC. An RC network determines the phase angle at which the DIAC fires, which in turn controls how much of the AC cycle is delivered to the lamp, effectively dimming it. The DIAC ensures a sharp, consistent gate pulse to the TRIAC for smooth, flicker-free dimming. diac db2 datasheet pdf 14 top
The charge stored in the capacitor discharges through the DIAC into the Gate terminal of the Triac, firing it. Typical Circuits:
3V . Minimal asymmetry eliminates DC offsets in the circuit, protecting inductive loads from harmonic saturation. 3. Repetitive Peak On-State Current ( ITRMcap I sub cap T cap R cap M end-sub In a standard light dimmer, a DIAC is
While a standalone DB2 datasheet can be elusive, manufacturers of DIACs often provide comprehensive datasheets covering entire series, such as the widely available "DB3/DC34/DB4/DB6" datasheets from various manufacturers. The DB2 is often included in this family, with similar construction and application guidelines.
), which is the threshold where the device switches from a non-conducting to a conducting state. Description Typical Value (Approx.) Breakover Voltage ( cap V sub cap B cap O end-sub Voltage at which the device begins to conduct. ~32V (Range: 28V–36V) Breakover Current ( cap I sub cap B cap O end-sub Current at the breakover point. Repetitive Peak On-State Current ( cap I sub cap T cap R cap M end-sub Maximum peak current for short pulses. Voltage Symmetry Difference between positive cap V sub cap B cap O end-sub negative cap V sub cap B cap O end-sub Dynamic Breakover Voltage ( cap delta cap V Voltage drop during switching. Operating Temperature Junction temperature range. 3. Principle of Operation The DIAC functions as a voltage-sensitive switch: Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics The charge stored in the capacitor discharges through
Before analyzing the DB2 specifically, let us revisit the fundamentals. A DIAC is a two-terminal, bidirectional semiconductor device that conducts current only after its breakover voltage has been exceeded. Unlike a diode, which conducts in one direction, a DIAC conducts in both directions once the voltage across it reaches the breakover point (typically ±28 to ±36 volts for the DB2 series).
The DB2 is commonly used in circuits where precise, symmetrical switching is needed:
Ensures high stability, reliability, and protection against environmental contaminants.
The is a high-reliability silicon bidirectional trigger diode engineered explicitly for gate-triggering thyristors like TRIACs and SCRs in AC phase-control applications. Acting as a solid-state bidirectional voltage switch, it remains non-conductive until its terminal voltage reaches a precise breakthrough threshold. It is widely used in systems like light dimmers, motor speed controllers, and electronic ballasts .