Thyristor BT151-500R – 500V, 12A
⚡ BT151-500R Thyristor – 500V, 12A SCR (Silicon-Controlled Rectifier)
The BT151-500R is a robust thyristor (also called an SCR – Silicon-Controlled Rectifier) designed for switching and phase control in high-power AC/DC applications. With a voltage rating of 500V and current handling of up to 12A, it is ideal for motor control, light dimming, heating control, and power switching circuits.
⚙️ Technical Specifications
| Parameter | Specification |
|---|---|
| Device Type | SCR (Thyristor) |
| Part Number | BT151-500R |
| Repetitive Peak Off-State Voltage (V<sub>DRM</sub>) | 500V |
| On-State RMS Current (I<sub>T(RMS)</sub>) | 12A |
| Surge Current (I<sub>TSM</sub>) | 100A (non-repetitive, 10ms) |
| Gate Trigger Current (I<sub>GT</sub>) | 5 – 15 mA |
| Gate Trigger Voltage (V<sub>GT</sub>) | ~1.5V |
| Holding Current (I<sub>H</sub>) | ~5 – 15 mA |
| Package | TO-220 (3-pin) |
| Mounting | Through-hole with heatsink tab |
✅ Features
🔋 High current and voltage ratings – suitable for AC load control
🔄 Ideal for phase control, light dimmers, motor speed control, and soft starters
💡 Can switch resistive, inductive, or capacitive loads
🛠️ TO-220 package – easy to mount with or without heatsink
🧰 Compatible with zero-cross detection and optotriac drivers
🛠️ Typical Applications
🌀 Fan/motor speed controllers
💡 AC dimmers for lamps or heaters
🔌 Power control in industrial systems
⚡ DIY SSR (Solid State Relay) designs
📎 Pinout (TO-220 Package)
CopyEditFRONT VIEW ________ | | | |← Heatsink tab |________| | | | A G K
A – Anode
G – Gate
K – Cathode
📌 Connect gate to control pin via resistor (typically 330–1kΩ)