BD135 Transistor TO-126 Code: 93826395

The BD135 is a medium-power silicon NPN transistor in a plastic TO-126 package, built for audio amplifiers, driver stages, and general switching. It handles a maximum collector current of 1.5A and voltages up to 45V, making it a popular component in electronics tinkering and repair across local and global markets.

 Key Technical Specifications

• Type:NPN Bipolar Junction Transistor (BJT)
• Package Type:TO-126 (SOT-32)
• Max Collector-Emitter Voltage :45V
• Max Collector-Base Voltage: 45V
• Max Emitter-Base Voltage :5V
• Max Collector Current :5A
• Max Power Dissipation:5W (with proper heatsink)
• DC Current Gain :40 to 250
• Transition Frequency :190 MHz

Pinout Configuration

Looking at the front (marked side) of the TO-126 package with the pins pointing down, the pinout from left to right is:

1. Emitter (E)
2. Collector (C)
3. Base (B)

 Complementary & Alternative Pair

• PNP Complementary Partner:BD136 (or higher voltage variants BD138 / BD140) which is ideal for push-pull audio amplifier output stages.
• Common Equivalents:BD139 (higher voltage rating up to 80V), BD141, or TIP31C (in larger TO-220 packages if space permits).