DB3 DIAC — Reliable Bidirectional Trigger Device for AC Control 🔌

The DB3 DIAC is a robust, bidirectional trigger device designed for precise AC phase control. Widely used to fire triacs and other thyristors, it features a tightly controlled breakover voltage and a low on-state drop, delivering repeatable triggering and dependable performance in light dimmers, motor speed controllers, and related power control circuits. Ideal for both electronics engineers and hobbyists working with electronics components and modules.

Key Features ✨

• Defined Breakover Voltage (VBO 30–36 V) ⚡ — Ensures consistent, repeatable triggering in AC control applications.
• Low On-State Voltage Drop 🔋 — Promotes efficient conduction after triggering to minimize power loss.
• Bidirectional Operation ↔️ — Conducts in both polarities, perfect for sinusoidal AC waveforms.
• Compact DO-35 Package 📏 — Axial leaded form factor for easy PCB integration; TO-92 variants exist in the market.

Specifications 📐

• Breakover Voltage (VBO): 30 V to 36 V
• Breakover Current (IBO): ≤ 50 µA
• Holding Current (IH): ~ 5 mA (typical)
• Maximum Repetitive Peak Off-State Voltage (VDRM): 300 V
• Package Type: DO-35 (axial)

Applications ⚙️

• Triggering Triacs and Thyristors — Provides a sharp trigger pulse for reliable device turn-on.
• Phase Control Circuits — Used in light dimmers, fan regulators, and motor speed controllers.
• Over-Voltage Protection — Acts as a clamp/trigger element in protective networks.
• Pulse Generation — Produces clean, steep pulses for timing and triggering functions.

Why Choose the DB3 DIAC? ✅

• Reliability — Proven, consistent performance over long service life.
• Efficiency — Low on-state drop for reduced dissipation.
• Compactness — Small footprint simplifies placement in dense layouts.
• Versatility — Suitable from consumer dimming controls to industrial power control systems.

Integration Tips for Arduino and Raspberry Pi 🧩

While the DB3 DIAC is primarily used in the high-voltage AC domain, it can be part of systems that also use Arduino, Raspberry Pi, or other microcontroller platforms. For MCU-based control, use appropriate isolation and interface components (for example, an optotriac driver module) and keep the DIAC within the AC trigger network. Always observe safe creepage/clearance and never connect mains-referenced nodes directly to logic-level pins.

Package Contents 📦

1 × DB3 DIAC