Power Transistor BD380 PNP, 1.5A TO-126

Power Transistor BD380 PNP, 1.5A TO-126

Transistors

Reference: TRBD380

Part.No: BD380

€1.20

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The BD380 is a medium-power PNP Bipolar Junction Transistor (BJT) in a TO-126 package. Designed for relay drivers, motor control, and switching applications where a small-signal transistor lacks thermal capacity but a full TO-220 is oversized.

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Description
Product Details

BD380 PNP Power Transistor - Relay & Motor Driver in Compact TO-126

The BD380 is a medium-power PNP transistor ideally suited for applications requiring moderate current handling and thermal performance beyond what small-signal devices can offer. Its flat-back TO-126 package allows direct mounting onto small heatsinks, making it an economical choice for relay drivers, motor control stages, and power switching circuits in robotics and automation projects.

Functions & Applications

Medium Power Capability: Handles up to 1.5A of collector current, bridging the gap between small-signal and large power transistors.
TO-126 Package with Mounting Tab: Flat back allows secure attachment to mini heatsinks for improved thermal dissipation.
Relay & Motor Ready: Ideal for driving inductive loads such as 12V relays and small DC motors with appropriate base drive.
Cost-Effective Alternative: Smaller footprint and lower cost than TO-220 power transistors for moderate-power applications.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	80V
Max Collector Current (Ic)	1.5A
Power Dissipation (Pd)	12.5W
Mounting Type	Through-Hole (THT) with Heatsink Tab

Frequently Asked Questions

Q: Can the BD380 be driven directly by an Arduino output pin?
A: Not reliably without a driver transistor. The BD380 has relatively low hFE (around 40–100), requiring significant base current. A small-signal transistor like BC547 should be used as a driver stage between the Arduino and the BD380's base.

Q: What is the complementary NPN transistor to the BD380?
A: The complementary NPN version is the BD379, offering the same voltage and current ratings but opposite polarity for dual-supply designs.

Notes

Always use a flyback diode (1N4007 or similar) when switching inductive loads like relay coils to protect the transistor from reverse voltage spikes.

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-126

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