BD140 PNP Power Transistor

The BD140 is a medium-power PNP Bipolar Junction Transistor (BJT) designed for switching and amplification applications. It is widely used in audio amplifiers, motor drivers, relay drivers, voltage regulator circuits, power supplies, LED drivers, and DIY electronics projects. With its 80V collector-emitter voltage rating and 1.5A collector current capability, the BD140 is an excellent choice for medium-power electronic circuits and is commonly paired with the BD139 NPN transistor.

Features

• Full Name: BD140 PNP Power Transistor
• Medium-power PNP transistor
• High current handling capability
• Fast switching performance
• Suitable for switching and amplification
• Low collector-emitter saturation voltage
• TO-126 package for efficient heat dissipation
• Reliable and durable construction
• Easy heat sink mounting
• Complementary transistor to BD139

Specifications

Pin Configuration

When viewed from the front (flat side facing you, leads downward):

Note: The metal tab is internally connected to the Collector (C).

Applications / Uses

• Audio amplifier circuits
• Push-pull amplifier stages
• Relay driver circuits
• DC motor control
• Voltage regulator circuits
• Power supply circuits
• LED driver circuits
• Arduino interface circuits
• Robotics projects
• DIY electronics

Advantages

• High current capability
• Reliable switching performance
• Suitable for amplifier applications
• Compact TO-126 package
• Easy heat sink installation
• Cost-effective solution
• Widely available

Size

Package Includes

• 1 × BD140 PNP Power Transistor

Note: The BD140 is commonly used together with the BD139 in complementary push-pull amplifier circuits and power driver stages. For applications operating near the maximum current or power ratings, use a suitable heat sink to improve heat dissipation and ensure reliable operation.