Transistor BC639

Transistor BC639 NPN, 1A TO-92

Transistors

Reference: TRBC639

Part.No: BC639

€0.50

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The BC639 is a high-current NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Optimized for medium-power switching and amplification in power supplies, motor control, and industrial-grade DIY electronics.

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Description
Product Details

BC639 High-Current Transistor - Medium-Power Switching & Amplification

The BC639 is an NPN transistor designed for medium-current applications, capable of handling up to 1A collector current at voltages up to 80V. It combines the compact TO-92 package with robust switching performance, making it ideal for relay drivers, power supply control stages, and industrial switching circuits.

Functions & Applications

High Collector Current: Supports up to 1A, ideal for driving medium-power loads without external amplification.
Medium Voltage Rating: Vceo 80V provides headroom for switching applications in higher-voltage supplies.
TO-92 Package: Through-hole design, easy soldering and breadboard integration.
Reliable Switching: Excellent switching speed and saturation characteristics for fast on/off transitions.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	80V
Max Collector Current (Ic)	1A
Power Dissipation (Pd)	800mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What load can the BC639 drive directly?
A: The BC639 can drive loads up to 1A at saturation, such as medium-size relays (typical coil current 500–800mA), small solenoids, and 12V motor control circuits. Always use a flyback diode for inductive loads.

Q: What is the complementary PNP transistor for BC639?
A: The complementary PNP part is the BC640, offering matched performance for push-pull and complementary switch 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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