Ween BT169D Silicon Controlled Rectifier SCR Thyristor 400V TO-92

The Ween BT169D Silicon Controlled Rectifier (SCR) Thyristor is a sensitive-gate device rated at 400 V repetitive peak off-state voltage, designed for reliable switching in low-power electronic circuits.

Overview

The BT169D is a sensitive-gate silicon controlled rectifier (SCR), also known as a thyristor. It is encased in a through-hole, TO-92 plastic package and uses a planar passivated construction that offers robust voltage handling. Its sensitive gate allows it to be triggered directly from microcontrollers, logic ICs, and other low-power gate trigger sources, helping to simplify control circuit design and minimise component count. The planar passivation process supports voltage ruggedness and long-term operational reliability.

Key Features

• Sensitive-gate silicon controlled rectifier (SCR) thyristor
• Planar passivated construction
• Standard TO-92 (SOT54) plastic package for through-hole mounting
• 3 pins
• Maximum gate trigger current of 200 µA, suited to low-power drivers
• Maximum gate trigger voltage of 800 mV

Specifications

• Average on-state current: 500 mA
• On-state RMS current: 800 mA
• Non-repetitive peak on-state current: 8 A (surge rating)
• Repetitive peak off-state voltage: 400 V
• Holding current: 5 mA
• Maximum junction temperature: 125°C

Applications

• Ignition circuits for controlled power switching
• Lighting ballasts for fluorescent and other discharge lamps
• Protection circuits where reliable latching action is required
• Portable devices, consumer electronics, and industrial power management systems

Choose the Ween BT169D when you need a compact, sensitive-gate thyristor for low-power switching applications.