Transistor BC637 NPN, 60V, 1A, TO-92

Transistor BC637 NPN, 1A TO-92

Transistors

Reference: TRBC637

Part.No: BC637

€0.60

Last items in stock

Immediate Dispatch

The BC637 is a medium-power NPN Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 60V and 1A. Suitable for driving relays, motors and moderate-load switching in general-purpose electronics.

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

BC637 Medium-Power Transistor - 1A Switching & Driving

The BC637 is an NPN transistor built for tasks that exceed the current limits of small-signal parts like the BC547, offering up to 1A of collector current. It's a practical choice for hobbyists and engineers who need to switch relays, small motors or lamps directly from a control circuit.

Functions & Applications

1A Collector Current: Enough headroom to directly drive relays, small motors and other medium loads.
60V Vceo Rating: Provides a solid voltage margin for automotive and general 12V/24V circuits.
TO-92 Package: Compact through-hole form factor, easy to place on breadboards and prototyping PCBs.
General-Purpose Switching: A step up from small-signal BJTs when more current is needed without moving to a full power package.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	60V
Max Collector Current (Ic)	1A
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Can the BC637 drive a 12V automotive relay directly?
A: Yes, provided the relay coil current stays within the 1A limit. Use a flyback diode across the coil to protect the transistor from switching spikes.

Q: What is the complementary PNP part for BC637?
A: The complementary PNP transistor is the BC638.

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

16 other products in the same category:

Transistor BC302 NPN, 60V, 0.5A, 0.85W TO-39

Transistors

Transistor BC302 NPN, 0.5A TO-39

Reference:

TRBC302

The BC302 is an NPN Bipolar Junction Transistor (BJT) in a metal TO-39 package, rated for 60V and 0.5A. Suitable for general-purpose amplification and switching applications requiring a robust metal-can case.

Last items in stock

Transistor 2N2219

Transistor 2N2219 2

Transistors

Transistor 2N2219 NPN, 0.8A TO-39

Reference:

TR2N2219

The 2N2219 is a classic NPN Bipolar Junction Transistor (BJT) in a rugged metal-can TO-39 package. Designed for high-speed switching and medium-current amplification, it handles higher collector currents than typical TO-92 small-signal parts.

In Stock

Power Transistor BD646 PNP Darlington, TO-220

Transistors

Power Transistor BD646 PNP Darlington, TO-220

Reference:

TRBD646

The BD646 is a PNP Darlington transistor in a TO-220 package, engineered for high-current switching and motor control applications. Its internal Darlington configuration delivers exceptional current gain, enabling direct load driving from weak logic signals.

Last items in stock

Transistor BF234 NPN RF, 30mA TO-106

Transistors

Transistor BF234 NPN RF, 30mA TO-106

Reference:

TRBF234

The BF234 is an NPN Silicon RF Bipolar Transistor in a TO-106 package. Designed for high-frequency amplification in AM/FM IF stages, tuners and general RF/IF receiver circuits.

Last items in stock

Transistor 2SA817

Transistors

Transistor 2SA817 PNP, 0.3A TO-92

Reference:

TR2SA817

The 2SA817 is a PNP Silicon Epitaxial Bipolar Transistor (BJT) by Toshiba in a TO-92 package. Designed as a driver stage for 20-25W audio power amplifiers and general audio frequency amplification.

In Stock

Transistor AF239 PNP, UHF TO-72

Transistor AF239 PNP, UHF TO-72 2

Transistors

Transistor AF239 PNP, UHF TO-72

Reference:

TRAF239

The AF239 is a vintage PNP germanium BJT in TO-72 package, purpose-built for UHF front-end amplification in television tuners and RF preamplifiers. Prized for its low noise figure and stability at VHF/UHF frequencies.

In Stock

Transistor BC441 NPN, 60V, TO-39

Transistors

Power Transistor BC441 NPN, 2A TO-39

Reference:

TRBC441

The BC441 is a medium-power NPN Bipolar Junction Transistor (BJT) in a metal TO-39 package. Designed for driver stages, audio output and general-purpose switching applications requiring higher current and voltage margins than small-signal parts.

Last items in stock

Transistor 2N2222

Transistors

Transistor 2N2222 NPN, 0.8A TO-92

Reference:

TR2N2222A

The 2N2222 is a classic general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-92 package, from CDIL. Widely used for switching and small-signal amplification in Arduino, Raspberry Pi and general-purpose DIY electronics.

Last items in stock

Transistor BC212 PNP 50V 300mA

Transistors

Transistor BC212 PNP 50V 300mA

Reference:

TRBC212L

Last items in stock

Transistor 2SD879 NPN Darlington, TO-92

Transistors

Transistor 2SD879 NPN Darlington, TO-92

Reference:

TR2SD879

The 2SD879 is a high-gain NPN Darlington transistor in a TO-92 package. Engineered for applications requiring massive current amplification, such as relay drivers, motor control, and high-impedance signal switching.

Last items in stock

Transistor AF127 PNP, Germanium TO-72

Transistor AF127 PNP, Germanium TO-72 2

Transistors

Transistor AF127 PNP, Germanium TO-72

Reference:

TRAF127

The AF127 is a vintage PNP germanium transistor in a TO-72 package with shield lead. Engineered as a direct replacement for the AF117, it eliminates tin whisker risk while delivering identical RF and IF amplification performance for radio restoration and vintage audio circuits.

In Stock

Transistor AF106 PNP, VHF Germanium TO-72

Transistor AF106 PNP, VHF Germanium TO-72 2

Transistors

Transistor AF106 PNP, VHF Germanium TO-72

Reference:

TRAF106

The AF106 is a PNP Germanium BJT in a TO-72 package, purpose-built for VHF/UHF tuning circuits. A classic component for vintage television and FM radio restoration, prized for its excellent high-frequency performance in oscillators and RF mixers.

In Stock

Transistor BC130

Transistors

Transistor BC130 NPN, 0.1A TO-18

Reference:

TRBC130

The BC130 is a classic NPN Bipolar Junction Transistor (BJT) in a hermetic TO-18 metal-can package. Originally designed for low-noise audio-frequency input and driver stages.

In Stock

Power Transistor BD437 NPN, 8A TO-126

Transistors

Power Transistor BD437 NPN, 8A TO-126

Reference:

TRBD437

The BD437 is a high-current NPN Power Transistor in a TO-126 package. With a maximum collector-emitter voltage of 45V and collector current up to 8A, it is ideal for medium-power amplification stages and output drivers in audio and switching applications.

In Stock

Transistor BC558

Transistors

Transistor BC558 PNP, 30V, 0.1A TO-92

Reference:

TRBC558

In Stock

Transistor 2SA1015

Transistors

Transistor 2SA1015 PNP, 150mA TO-92

Reference:

TR2SA1015

The 2SA1015 is a general-purpose PNP Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for driver-stage audio frequency amplification and low-power switching, it is the classic complementary pair to the NPN 2SC1815.

In Stock

Product added to wishlist

Product added to compare.