Bd139 Npn Transistor In Pakistan

BD139 NPN Power Transistor – Versatile & High Performance

The BD139 is a widely used NPN transistor known for its high collector current, durability, and cost-effectiveness. It’s ideal for a range of applications—from hobby electronics and Arduino projects to commercial devices. With a capacity to drive up to 1.5A, the BD139 is suitable for controlling high-power LEDs, relays, motors, and more.

⚙️ Key Features & Specifications

• Transistor Type: NPN

• Package Type: TO-126

• Collector-Emitter Voltage (VCE): 80V

• Collector-Base Voltage (VCB): 80V

• Emitter-Base Voltage (VEBO): 5V

• Collector Current (IC): Max. 1.5A

• Collector Dissipation (Pc): 12.5W

• DC Current Gain (hFE): 25 – 250

• Transition Frequency (fT): 190 MHz

• Saturation Voltage (VCE(sat)): 0.5V

• Operating & Storage Temp: -55°C to +150°C

🔁 Complementary & Equivalent Transistors

• PNP Complementary: BD140

• Equivalents / Replacements: BD230, BD349, BD379, 2SC5171S

💡 Where & How to Use BD139

The BD139 is an excellent choice for both educational and industrial applications:

• Arduino & Microcontroller Circuits

• Analog Signal Amplification

• DC Motor Driving (with external components)

• Power Supplies & Chargers

• Relay Control (high current switching)

• Audio Amplifiers & Preamp Stages

• As part of a Darlington pair for increased gain

🔧 Note: When operating above 200mA, it’s highly recommended to use a heatsink to avoid overheating.

⚠️ Safe Usage Guidelines

To ensure reliable and long-term performance of the BD139:

• Do not exceed 80V on any pin

• Keep collector current ≤ 1.5A

• Use a base resistor to control base current appropriately

• Always use a heatsink if current > 200mA

• Avoid exposing to temperatures outside -55°C to +150°C

📦 Package Includes

• 1 × BD139 NPN Power Transistor (TO-126)