Diac Db2 Datasheet Pdf 14 Top File

A DIAC is a two-terminal semiconductor device that acts as a switch, remaining non-conductive until a specific breakover voltage cap V sub cap B cap O end-sub

The is a bidirectional trigger diode designed to provide a stable, fixed voltage reference for phase-control circuits. Functioning primarily as a gate-triggering device, the DB2 works alongside TRIACs and Thyristors to enable efficient alternating current (AC) power regulation.

The voltage across the DIAC decreases as current increases, providing the sharp pulse needed for a TRIAC gate. 4. Typical Applications of the DB2 DIAC

: Used in conjunction with Triacs for smooth light intensity control. diac db2 datasheet pdf 14 top

| # | Parameter | Symbol | Value | Unit | Conditions | |---|-----------|--------|-------|------|-------------| | 1 | Breakover Voltage (Symmetrical) | VBO | 30 – 34 | V | Typically 32V | | 2 | Breakover Voltage Symmetry | ΔVBO | ±3 | V | Difference between positive & negative | | 3 | Breakover Current | IBO | 50 – 200 | µA | Max 200 µA | | 4 | On-State Voltage | VT | ~5 | V | At IT = 1A (pulse) | | 5 | On-State Current (Peak) | ITM | 2 | A | Non-repetitive, 10ms pulse | | 6 | Peak Pulse Current | IPSM | 10 | A | t = 20 µs | | 7 | Off-State Leakage Current | IDRM | 10 | µA | At V < VBO | | 8 | Holding Current | IH | 50 | mA | Typical value | | 9 | Switching Power Dissipation | PGM | 5 | W | For pulse condition | | 10 | Operating Junction Temperature | Tj | -40 to +125 | °C | Full range | | 11 | Storage Temperature | Tstg | -55 to +150 | °C | No bias | | 12 | Output Voltage Rise Rate | dv/dt | 50 | V/µs | Minimum guaranteed | | 13 | Package Options | – | DO-35, SOT-23, SOD-123 | – | Through-hole & SMD | | 14 | Lead-Free & RoHS | – | Yes | – | Compliant |

) : Max values range between . Low breakover current minimizes power consumption before full conduction occurs. Repetitive Peak On-State Current ( ITRMcap I sub cap T cap R cap M end-sub ) : Supports up to 2.0 A for short pulse widths (

A . This guarantees that very little leakage current passes through the circuit until the precise triggering point is met. Excellent voltage symmetry, usually within ±plus or minus ±plus or minus A DIAC is a two-terminal semiconductor device that

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.

The voltage drop measured across the device when it transitions from its breakover state down to a specified conducting current level (usually 10 mA). Datasheets show a minimum value of , confirming a crisp trigger pulse. Peak Pulse Current ( IPcap I sub cap P ITRMcap I sub cap T cap R cap M end-sub

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.

(Leakage Current): The small current that flows through the DIAC before it breaks over ( Typically -40°C to +125°C. Tjcap T sub j

): Typically rated around 28V to 36V, making it ideal for low-voltage switching tasks. Breakover Voltage Symmetry (

The AC voltage charges a capacitor through a potentiometer. Triggering: When the capacitor voltage reaches the VBOcap V sub cap B cap O end-sub of the DB2, the DIAC breaks down and conducts.