The DB2 DIAC acts as a switch. In a standard dimmer circuit:
Go to Diotec.com → Products → Trigger Diodes → DB2 → Click "Datasheet PDF".
Without that specific 14th page specification—the —modern light dimmers wouldn't exist. We would still be controlling lights with giant, hot, mechanical rheostats.
This article consolidates everything you need to know about the DB2 DIAC. We will explore its internal structure, electrical characteristics, and the top 14 specifications that engineers and hobbyists look for in a datasheet PDF. diac db2 datasheet pdf 14 top
This is the most important specification. It is the voltage at which the DIAC switches from OFF to ON. For a DB2, this voltage is designed to be in the . Once this voltage across MT1 and MT2 is exceeded, the device fires, providing a trigger pulse.
This is the peak current the DIAC can handle repeatedly in short pulses. For the DB series, this rating is commonly for a pulse duration of 10µs at 100Hz. It is a crucial limitation that dictates the DIAC's ability to drive the gate of a TRIAC.
| Parameter | Symbol | Value | Unit | Conditions | |-----------|--------|-------|------|-------------| | | V_BO | 28 – 36 | V | I_BO = 50 µA typical | | Breakover Current | I_BO | 50 – 200 | µA | | | Switching Voltage Symmetry | ΔV_BO | ±3 | V | V_BO positive vs negative | | Peak Output Current | I_PK | 2 | A | t_p = 10 µs | | On-State Voltage | V_AK | ≈ 5 – 8 | V | at I_PK | | Leakage Current | I_R | < 10 | µA | at 0.8 V_BO | | Junction Temperature | T_J | -40 to +125 | °C | | The DB2 DIAC acts as a switch
Possibly, but with caution. A DB3 has a typical breakover voltage of 32V, while a DB2 has a lower breakdown voltage, typically around 30V. Before substituting, be sure to review the datasheet of both components and check your circuit's specifications to ensure compatibility.
) compared to the more common DB3 or DB4 is required for circuit stabilization.
: When you download the PDF, search inside the document for "VBO" and "32V". If the document does not list the 14 parameters above, it is either an incomplete translation or a counterfeit datasheet. We would still be controlling lights with giant,
Produces a sharp pulse edge to trigger thyristors. Low Cost: Very economical component for mass production. High Reliability: Solid-state construction.
Designed to handle pulse discharges rather than continuous heavy loads, the DB2 typically supports a peak pulse current of for short durations (
: As these links may change, always search for site:st.com DB2 DIAC datasheet or site:diotec.com DB2 .