Transistor BC171 NPN 45 V 100 mA 300 mW TO-92

Transistor BC171 NPN, 0.1A TO-92

Transistors

Reference: TRBC171

Part.No: BC171

€0.60

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The BC171 is an NPN Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 45V / 100mA. A classic small-signal part suited to audio amplification and general-purpose switching in hobby and repair projects.

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Description
Product Details

BC171 NPN Transistor - Classic Small Signal Amplifier & Switch

The BC171 is an NPN small-signal transistor in a TO-92 package, widely used since the early transistor-radio era for low-power audio amplification and switching duties. It remains a solid choice for restoring vintage audio gear or building simple analog circuits where a reliable general-purpose NPN is needed.

Functions & Applications

General-Purpose NPN: Suitable for small-signal amplification and low-power switching tasks.
TO-92 Package: Standard through-hole case, easy to identify and solder on perfboard or vintage-style PCBs.
45V / 100mA Rating: Enough headroom for typical audio-stage and low-voltage switching circuits.
Legacy Compatibility: Useful for repairing or replicating older audio and analog designs that specify this part.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	45V
Max Collector Current (Ic)	100mA
Power Dissipation (Pd)	300mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the complementary PNP transistor to the BC171?
A: The BC171 belongs to a family whose commonly cited complementary PNP counterpart is the BC251.

Q: Can the BC171 be used as a direct replacement for a BC107/BC108 in an old audio circuit?
A: In many low-power audio applications it can work similarly, since ratings are comparable, but always check the original pinout and gain (hFE) grouping before substituting.

Notes

This is a legacy/vintage-style NPN transistor, mainly used today for repairing or replicating older audio and analog circuits that specifically call for it.

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-92

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