DB3 – Bi Directional Diac
- Bidirectional Triggering – Conducts in both AC half-cycles
- Breakover Voltage: 30V–40V – Switches ON when voltage exceeds threshold
- Low Holding Current (~5mA) – Turns OFF automatically when current drops
- Reliable TRIAC Trigger – Commonly used in dimmers, fan regulators, and motor control
- Compact DO-35 Package – Easy to integrate in tight PCB layouts
- 2A Pulse Current Rating – Suitable for low to medium power switching
- Stable and Predictable Switching – Ensures consistent TRIAC triggering
3,00 EGP
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Description
The DB3 is a bidirectional DIAC (Diode for Alternating Current) commonly used in triggering TRIACs for AC switching applications like dimmer circuits, motor speed control, and power regulation.
⚡ Specifications:
- Breakover Voltage (V_BO): 30V – 40V
- Breakover Current (I_BO): ~0.5mA
- Holding Current (I_H): ~5mA
- Maximum Voltage: 32V (typical)
- Maximum Current: 2A (pulsed)
- Package: DO-35 (small diode-like package)
- Bidirectional Operation: Works in both AC half-cycles
🔌 How It Works:
- Below 30V: The DB3 remains OFF, acting as an open circuit.
- At 30V – 40V (Breakover Voltage): The DIAC conducts, allowing current to flow and triggering the TRIAC in an AC control circuit.
- Below Holding Current (~5mA): It turns OFF until the voltage reaches breakover again.
📌 Applications:
✅ TRIAC Triggering (dimmer circuits, fan regulators)
✅ AC Motor Speed Control
✅ Light Dimmers
✅ Heater Control Circuits
✅ Oscillator Circuits
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Specification
General
| WeightWeight | 0,0000 g |
|---|---|
| Type | Bi-Directional Diac (Diode for Alternating Current) |
| Model | DB3 |
| Breakover Voltage (VBO) | 28–32 V |
| Maximum Repetitive Off-State Voltage (VDRM) | 32 V |
| Maximum Repetitive Reverse Voltage (VRRM) | 32 V |
| Gate Trigger Current | Not Required (Voltage-triggered device) |
| Maximum On-State Current (IT) | 0.5 A |
| Maximum Surge Current (ITSM) | 2 A (non-repetitive) |
| Off-State Leakage Current | <5 μA |
| Operating Temperature | -40°C to +125°C |
| Mounting Type | Through-Hole (DO-35 / Glass Encapsulated) |
| Applications | Phase Control, AC Switching, Triggering TRIACs, Light Dimmers, Motor Speed Controls |
| Package Contents | 1× DB3 Bi-Directional Diac |
