Transistor BD131 NPN, 70V, 3A, 15W, TO-126

Power Transistor BD131 NPN, 3A TO-126

Transistors

Reference: TRBD131

Part.No: BD131

€1.20

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The BD131 is a medium-power NPN Bipolar Junction Transistor (BJT) in a TO-126 package, rated for 70V and 3A. Commonly used in audio amplifier stages, voltage regulators and medium-current switching applications.

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Description
Product Details

BD131 Medium-Power NPN Transistor - Audio & Switching Applications

The BD131 is a medium-power NPN BJT in a TO-126 package, built to handle up to 3A and 70V for demanding switching and amplification tasks. Its TO-126 case allows direct heatsink mounting, making it a solid choice for audio amplifier output stages, DC motor drivers and linear power supply circuits.

Functions & Applications

Medium Power Handling: Supports up to 3A collector current and 15W dissipation for robust switching and amplification.
70V Vceo Rating: Enough headroom for typical audio and power supply rail voltages.
TO-126 Package: Tab-mounted case allows direct bolt-on heatsink attachment for improved thermal performance.
Versatile Use: Suitable for audio amplifier output stages, series regulators and relay/motor driving.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	70V
Max Collector Current (Ic)	3A
Power Dissipation (Pd)	15W
Mounting Type	Through-Hole (THT), heatsink tab

Frequently Asked Questions

Q: Does the BD131 need a heatsink?
A: For currents approaching 3A or continuous operation near its 15W power rating, a heatsink attached to the TO-126 tab is strongly recommended to keep junction temperature safe.

Q: What is the complementary PNP part for BD131?
A: The complementary PNP transistor is the BD132, sharing the same voltage, current and package specifications.

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: NPN
Transistor Case Style: TO-126

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