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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

SKU: aA1754 Category: Electronic Components

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