Transistor BC309 PNP, 20V, 100mA, 300mW, TO-92

Transistor BC309 PNP, 100mA TO-92

Transistors

Reference: TRBC309

Part.No: BC309

€0.60

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The BC309 is a PNP Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 20V / 100mA / 300mW. Suited to small-signal amplification and low-power switching in general-purpose and educational circuits.

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Description
Product Details

BC309 PNP Small Signal Transistor - Low-Power Switching & Amplification

The BC309 is a PNP small-signal transistor housed in the standard TO-92 package, commonly used as the complementary counterpart to NPN parts in the same family for push-pull and driver stages. It is a solid choice whenever a circuit design specifically calls for PNP polarity in low-voltage, low-current signal or switching applications.

Functions & Applications

PNP Polarity: Complements NPN small-signal transistors in push-pull and driver topologies.
Compact TO-92 Package: Through-hole design, easy to solder on breadboards and prototyping PCBs.
Low-Power Switching: Handles up to 100mA / 300mW, suitable for small relays, LEDs and logic-level loads.
General-Purpose Design: Widely used in educational kits and hobbyist analog/digital circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	20V
Max Collector Current (Ic)	100mA
Power Dissipation (Pd)	300mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the maximum load the BC309 can switch?
A: The BC309 is rated for up to 100mA collector current and 300mW power dissipation, so it suits small relays, LEDs and low-current logic-level loads rather than motor or high-power switching.

Q: Does the BC309 come in different gain (hFE) grades?
A: As with other transistors in this family, BC309 parts are commonly available with different hFE grade suffixes (A/B/C); check the specific batch marking if your circuit is gain-sensitive.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: PNP
Transistor Case Style: TO-92

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