2pcs bd139 npn transistor

This pack contains two BD139 NPN epitaxial planar transistors, designed for medium-power switching and amplification applications. Housed in a compact TO-126 package, these transistors are widely used in audio amplifiers, driver stages, voltage regulators, and general-purpose electronic circuits.

✅ Specifications:

• Transistor Type: NPN Bipolar Junction Transistor (BJT)

• Part Number: BD139

• Package: TO-126 (SOT-32)

• Collector-Emitter Voltage (Vceo): 80V

• Collector-Base Voltage (Vcbo): 80V

• Emitter-Base Voltage (Vebo): 5V

• Collector Current (Ic): 1.5A (Continuous)

• Power Dissipation (Pd): 12.5W (at 25°C case temperature with proper heatsink)

• DC Current Gain (hFE): 25 – 160 (depending on current)

• Transition Frequency (ft): 190MHz (typical)

• Operating Temperature: -65°C to +150°C

• Complementary PNP Type: BD140

• Quantity: 2 Pieces

⚠️ Note: For operation near maximum power dissipation, a proper heatsink is required. Without adequate cooling, the transistor may overheat and fail.

📦 Applications:
✔️ Audio amplifier driver and output stages
✔️ Medium-power switching circuits
✔️ Voltage regulator pass transistors
✔️ Motor and solenoid drivers
✔️ General-purpose amplification
✔️ Power supply control circuits
✔️ Hobbyist DIY electronics projects