The DB2 is a popular variant because its symmetrical switching characteristic generates a clean trigger pulse for a TRIAC gate, making it ideal for dimmers, motor speed controllers, and heat regulators.
To serve that search intent, here are the you should look for in any DB2‑compatible datasheet:
If you cannot locate a DB2, consider these options: 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 |
A DIAC (Diode for Alternating Current) is a two-terminal, bi‑directional semiconductor switch that blocks current until its is reached, at which point it abruptly turns on into a low‑voltage conducting state. Unlike a standard diode, it conducts in both directions, making it ideal for triggering triacs in AC circuits. Most common DIACs have a symmetrical breakover voltage in the 28 V–36 V range, though asymmetric variants (e.g., 7 V–18 V) also exist. The DB2 is a popular variant because its
): Typically ranges between for trigger-grade DIACs. Repetitive Peak On-State Current ( ITRMcap I sub cap T cap R cap M end-sub ): Up to 2.0 A ( Breakover Current ( IBOcap I sub cap B cap O end-sub ): Max 50 \mu A to 100 \mu A . Operating Temperature Range ( Tjcap T sub j ): -40∘Cnegative 40 raised to the composed with power cap C
): The difference between positive and negative breakover voltage is kept to a minimum (typically Most common DIACs have a symmetrical breakover voltage
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.
Based on standard industry DIAC datasheets from manufacturers like STMicroelectronics , here are the typical parameters for this series: Breakover Voltage ( VBOcap V sub cap B cap O end-sub
The DB2 is a member of the (Diode for Alternating Current) family, a bidirectional trigger diode that acts as a gatekeeper. For decades, these tiny, glass-encapsulated components have been the silent partners to TRIACs in almost every household light dimmer and ceiling fan speed controller.
A guaranteed dv/dt immunity means the DB2 will not false-trigger due to fast voltage transients from inductive loads. This makes it reliable in motor speed controllers.