SCR Thyristor BT145-800 pinout, Features and Specifications

SCR Thyristor BT145-800

In this post, we are going to explain the SCR Thyristor BT145-800: A Silicon Controlled Rectifier (SCR), also known as a thyristor, is a device commonly used for controlling high power in electrical circuits. It acts as a switch that can turn on and conduct current when triggered, but it cannot turn off by itself until the current drops below a certain level. It has three terminals named Anode (A), Cathode (K), and Gate (G). The anode and cathode carry the main current, while the gate is used to control the switching action.

SCR Thyristor BT145-800 pinout

SCR Thyristor BT145-800 pinout

SCR Thyristor BT145 Features

  • Planar passivated high-reliability SCR.
  • designed for medium-power AC switching.
  • low gate trigger current (easy to drive).
  • capable of handling large surge currents.
  • It is suitable for phase control, AC power regulation, crowbar protection, and motor control.
  • Plastic TO-220AB package with a good thermal performance.

SCR Thyristor BT145 Specifications

Parameter Value
Repetitive Peak Off-State Voltage 800 V
Average On-State Current 16 A (T<sub>mb</sub> ≤ 101 °C, half sine)
RMS On-State Current  25 A
Non-Repetitive Surge Current 300 A (10 ms), 330 A (8.3 ms)
I²t for Fusing 450 A²·s
Rate of Rise of On-State Current 200 A/µs
Gate Trigger Current ≤ 35 mA (typ. ~5 mA)
Gate Trigger Voltage ≤ 1 V
Gate Peak Current 5 A
Gate Power 20 W (peak), 0.5 W (avg)
Holding Current ≤ 60 mA
Off-State Leakage Current ≤ 1 mA
Junction Temperature –40 °C to +125 °C (max +150 °C)
Thermal Resistance, j-mb ~1 kW
Package TO-220AB

BT145 Applications

  • AC power control
  • Motor control and soft starters.
  • Crowbar protection circuits.
  • Battery chargers.
  • Inrush current limiting.
  • Capacitor discharge circuits

Datasheet of SCR Thyristor BT145

SCR Thyristor BT145-800 datasheet

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