Transistor BC149 NPN 20 V 200 mA 250 mW SOT-25

Transistor BC149 NPN, 200mA SOT-25

Transistors

Reference: TRBC149

Part.No: BC149

€0.60

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The BC149 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a compact SOT-25 package. Suited for low-noise audio pre-amplification and small-signal switching in low-voltage circuits.

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Description
Product Details

BC149 NPN Transistor - Low-Noise Signal Amplification

The BC149 is an NPN small-signal transistor housed in a compact SOT-25 package, historically favored for low-noise audio input stages and general-purpose switching. Its low operating voltage and current rating make it a good fit for battery-powered signal circuits and vintage-style audio preamp restorations.

Functions & Applications

Low-Noise Design: Well suited for the input stage of audio preamplifiers and microphone circuits.
Compact SOT-25 Package: Small footprint for space-constrained PCB layouts.
Low-Voltage Operation: 20V Vceo rating fits well with battery-powered and low-voltage signal circuits.
General-Purpose Switching: Handles small relay coils, LEDs and logic-level loads up to 200mA.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	SOT-25
Collector-Emitter Voltage (Vceo)	20V
Max Collector Current (Ic)	200mA
Power Dissipation (Pd)	250mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the maximum voltage the BC149 can handle?
A: The BC149 has a Vceo rating of 20V, so it should only be used in low-voltage signal and switching circuits within this limit.

Q: Is the BC149 suitable for audio preamp circuits?
A: Yes, the BC149 was historically designed as a low-noise transistor, making it a good fit for microphone and audio pre-amplification input stages.

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: SOT-25

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