BD135

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The BD135 is a robust NPN power transistor designed for medium-power linear and switching applications. It’s commonly used in audio amplifiers, power regulators, motor drivers, and other circuits where moderate current handling and reliable switching are required. With its TO-126 package and ability to dissipate significant heat, the BD135 is a dependable choice for DIY electronics, industrial controllers, and educational projects.

How It Works:
The BD135 functions like a standard NPN transistor—when a small current is applied to the base, it allows a larger current to flow between the collector and emitter. This enables it to act as a switch or amplifier. It’s capable of handling collector currents up to 1.5A, making it suitable for driving small motors, relays, or for use in audio power stages and voltage regulation circuits.

Specifications:

Type: NPN Bipolar Junction Transistor
Collector-Emitter Voltage (Vce): 45V
Collector Current (Ic): 1.5A
Power Dissipation: Up to 12.5W (with proper heatsink)
DC Current Gain (hFE): 40–250
Transition Frequency: 190 MHz
Package: TO-126
Operating Temperature: -55°C to +150°C

Limitations:

Requires a heatsink for handling power above ~1W.
Not suitable for high-frequency or high-speed switching applications.
May require external biasing resistors and thermal protection in demanding use-cases.
Obsolete in some advanced designs—typically replaced by more modern equivalents in high-efficiency circuits.

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BD135

৳8

Overview

Reviews

Detail Description

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