Transistor BC140

Transistor BC140 NPN, 1A TO-39

Transistors

Reference: TRBC140

Part.No: BC140

€0.80

In Stock

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The BC140 is an NPN Bipolar Junction Transistor (BJT) in a metal TO-39 package, rated for 1A collector current and 3.7W power dissipation. Suited to medium-power switching and amplification stages requiring more current headroom than a small TO-92 device.

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Description
Product Details

BC140 NPN Transistor - Medium-Power Switching in a Rugged TO-39 Case

The BC140 is an NPN transistor in a metal TO-39 package, delivering up to 1A collector current and 3.7W dissipation, making it a step up from small-signal TO-92 parts for driving heavier loads. Its metal case improves heat dissipation compared to plastic packages, giving it more headroom in relay, motor and lamp driver circuits.

Functions & Applications

1A Collector Current: Handles moderate loads like small relays, motors and lamps directly.
Metal TO-39 Case: Better heat dissipation than plastic packages, improving reliability under load.
60V Vceo: Comfortable voltage margin for 12V/24V automotive and industrial control circuits.
50MHz Transition Frequency: Suitable for audio and general-purpose RF-adjacent switching tasks.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-39
Collector-Emitter Voltage (Vceo)	60V
Max Collector Current (Ic)	1A
Power Dissipation (Pd)	3.7W
Transition Frequency (fT)	50MHz
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Can the BC140 drive a 12V automotive relay directly?
A: Yes, as long as the relay coil current stays under 1A (Ic). Use a flyback diode across the coil to protect the transistor from inductive spikes.

Q: What is the complementary PNP part for BC140?
A: The commonly used complementary PNP counterpart is the BC160.

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-39

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