Power Transistor BD175 NPN, 3A TO-126

Power Transistor BD175 NPN, 3A TO-126

Transistors

Reference: TRBD175

Part.No: BD175

€1.00

In Stock

Immediate Dispatch

The BD175 is an NPN power BJT transistor in a TO-126 package, rated for 45V and 3A. Suitable for power amplification, driver stages and switching applications requiring moderate current handling.

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Description
Product Details

BD175 NPN Power Transistor - Reliable 3A Switching & Amplification

The BD175 is an NPN power transistor housed in a TO-126 package, built to handle up to 3A and 30W of dissipation. It is commonly used in audio driver stages, DC motor control and general-purpose power switching circuits where a compact TO-126 footprint is preferred over larger TO-220 parts.

Functions & Applications

3A Current Handling: Suitable for driving motors, relays and moderate-power loads.
30W Power Dissipation: Handles sustained power stages better than small-signal transistors.
Compact TO-126 Package: Smaller footprint than TO-220 while still supporting a heatsink tab.
45V Vceo Rating: Enough headroom for typical 12V-24V driver and switching circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	45V
Max Collector Current (Ic)	3A
Power Dissipation (Pd)	30W
Mounting Type	Through-Hole (THT), heatsink tab

Frequently Asked Questions

Q: Does the BD175 need a heatsink?
A: For loads approaching its 30W dissipation limit or continuous high-current operation, a heatsink attached to the TO-126 tab is recommended to keep junction temperature safe.

Q: Can the BD175 replace a BD139 in a circuit?
A: In many low-to-medium power designs it can work as a substitute since both are NPN TO-126 power transistors with similar voltage/current ratings, but always check the specific gain and pinout requirements of your circuit first.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-126

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