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BC807

BC807 Pinout and Marking Code

When you use the BC807 transistor, keep in mind it’s PNP-type, meaning the base needs a lower voltage than the emitter to turn on—perfect for low-level control. The SOT-23 package has pins numbered 1-2-3 from left to right when facing the flat side. Marking codes vary, like “2A,” “2k,” or “2n,” so use a multimeter to confirm pin order. With a max current of 500mA, it’s suitable for small loads. Pair it with an NPN transistor like BC817 to build push-pull or level-shifting circuits.

BC807 Equivalent PNP Transistor

If you don’t have a BC807 handy, the MMBT3906 is your most common alternative. It’s similar but can only handle up to 200mA, best for small loads. BC856B also works, but it’s meant strictly for small signals, not direct load driving. If you need more current—like driving relays or LEDs—try S8550, which handles up to 800mA, though its voltage limit is just 25V. Always check voltage, current, and gain specs carefully before choosing a substitute.

BC807 Amplifier Circuit Example

This circuit shows a classic common-emitter amplifier using a BC807 transistor, great for amplifying audio or small analog signals. Since it’s a PNP transistor, use negative voltage supply. Your input signal passes through capacitor C1 into the base to block DC, amplifying only AC. R1 and emitter resistor RE provide proper biasing, allowing stable transistor operation. Collector resistor RL converts amplified current into voltage, producing an inverted output signal. Capacitor C2 at the emitter boosts AC gain, with amplification depending on RL and RE ratio.

BC807 Switching Transistor Usage

When you’re using BC807 as a switch, the control logic is reversed compared to NPN transistors. Connect emitter (E) to positive voltage like 5V or 12V, collector (C) to the load, then to ground. Connect base (B) through a resistor (around 1kΩ) to your MCU pin. Low output from MCU turns the transistor on, powering your load. High output switches it off. Don’t skip the resistor to protect the transistor, and add a diode across inductive loads like relays to handle voltage spikes.

BC807 Low Current Switch Circuit

This circuit is a simple high-side switch using a BC807 transistor, perfect when your MCU controls small loads. Since BC807 is PNP, you need an NPN transistor to invert the signal. When your MCU outputs HIGH, the NPN transistor switches on, pulling the BC807 base low and activating the load. When the MCU goes LOW, the load turns off. Ideal for controlling small 12V devices like lights, buzzers, or relays.