(Repetitive Peak On-State Current): Maximum pulsed current the DIAC can handle repeatedly, usually 2.0A ( , F = 120Hz). VOcap V sub cap O
Since DB2 is frequently grouped with or replaced by the DB3/DB4 series, its performance follows these general parameters: DB3 (Standard) DB4 (High V) Breakover Voltage cap V sub cap B cap O end-sub Breakover Current cap I sub cap B cap O end-sub Peak Pulse Current cap I sub cap T cap R cap M end-sub Operating Temp cap T sub j -40 to +125 -40 to +125 Direct Datasheet Resources
Symmetry: Highly symmetric breakover voltage between positive and negative directions ( IBOcap I sub cap B cap O end-sub (Breakover Current): Low current requirement, typically at switching point. VFcap V sub cap F
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(Breakover Voltage) - Maximum: The maximum voltage at which the device is guaranteed to break over (35V or slightly higher).
A DIAC operates fundamentally as a bidirectional thyristor without a gate terminal. Structurally, it consists of a multi-layer semiconductor stack (typically a symmetrical three-layer or five-layer N-P-N architecture) enclosed within a glass or surface-mount package.
The layout ensures that the device maintains near-identical electrical traits regardless of the applied voltage polarity. Unlike a standard breakdown diode, a DIAC exhibits a . When the voltage across its terminals reaches a specific threshold (the breakover voltage, VBOcap V sub cap B cap O end-sub This likely relates to a DIAC component (DB2
Engineers needed a bodyguard for the TRIAC. Someone who would stand perfectly still, ignoring all the noise of the circuit, until the exact right moment to shout "GO!"
The DB2 DIAC is a bidirectional trigger diode characterized by a 28V–36V breakover voltage ( cap V sub cap B cap O end-sub
. The time it takes for the output pulse current to transition during switching. Fast rise times prevent phase lag and lower heat build-up during turn-on. at search results for "DIAC DB2 datasheet PDF" were
+125∘Cpositive 125 raised to the composed with power cap C
| Parameter | Symbol | Typical Value/Range | Unit | Conditions / Notes | | :--- | :--- | :--- | :--- | :--- | | | VBO | ~32 (typically 28 to 36) | V | This is the voltage at which the DIAC switches on. | | Breakover Current | IBO | Low (< 200) | µA | Current at the moment of VBO. | | On-State Voltage | VF, VO | < 5 | V | Voltage drop across the DIAC when conducting (measured at 10mA). | | Repetitive Peak On-State Current | ITRM | 2.0 | A | Maximum allowable peak current (tp=10µs, f=100Hz). | | Surge Peak On-State Current | ITSM | 16 | A | Maximum non-repetitive peak current (tp=10µs). | | Power Dissipation | PD | 150 | mW | On a printed circuit board (PCB). | | Operating Temperature Range | TJ | -40 to +110 | °C | Junction temperature range for operation. | | Storage Temperature Range | TSTG | -55 to +150 | °C | Safe temperature for storage. |
Whether you are an EE student debugging a lamp dimmer, or a production manager qualifying an alternate source for DIACs, the DB2 remains a top choice. Bookmark this guide and keep the table handy—you will consult it again.
The thermal envelope for standard operation spans from , protecting performance consistency under high ambient temperatures or heavy duty cycles. 3. Top 14 Applications of the DB2 DIAC