Transistor 2SC900 NPN, 20mA TO-92

Transistor 2SC900 NPN, 20mA TO-92

Transistors

Reference: TR2SC900

Part.No: 2SC900

€0.80

In Stock

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The 2SC900 is a silicon NPN small-signal transistor in a TO-92 package, originally designed as a low-frequency, low-noise amplifier for audio preamp and RF front-end stages.

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Description
Product Details

2SC900 Low-Noise NPN Transistor - Classic Audio & RF Preamp Stage

The 2SC900 is a silicon NPN bipolar transistor housed in a compact TO-92 package, originally released as a dedicated low-frequency, low-noise amplifier. It was widely used in vintage transistor radios, audio preamplifiers and low-level RF stages, and remains a useful part today for restoration projects and low-noise small-signal designs.

Functions & Applications

Low-Noise Design: Optimized from the factory for clean amplification of weak audio and RF signals.
Compact TO-92 Package: Through-hole design that is easy to solder onto perfboard or vintage-style PCBs.
Decent Gain (hFE ≥ 250): Provides strong signal amplification for preamp and small-signal switching tasks.
Good for Restoration Work: A practical choice when repairing classic transistor radios and audio gear originally built around this part.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Base Voltage (Vcbo)	30V
Collector-Emitter Voltage (Vceo)	25V
Max Collector Current (Ic)	20mA
Power Dissipation (Pc)	250mW
Transition Frequency (ft)	75-100MHz
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Can the 2SC900 drive an LED or a relay directly?
A: No, this is a small-signal part rated for only 20mA of collector current, so it is not suited to driving relay coils or higher-power LEDs directly - it is intended for low-level audio and RF signal amplification instead.

Q: What was the 2SC900 originally designed for?
A: It was designed and marketed specifically as a low-frequency, low-noise amplifier, making it a popular choice for audio preamp stages and AM/FM front-ends in vintage transistor radios.

Notes

This is a legacy/vintage-era small-signal part (originally by Usha/NEC), still useful for restoring classic transistor radios and audio gear rather than modern high-current designs.

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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