Transistor BD185 NPN, 4A, 30V, 40W, TO-126

Power Transistor BD185 NPN, 4A TO-126

Transistors

Reference: TRBD185

Part.No: BD185

€1.20

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The BD185 is an NPN Bipolar Junction Transistor (BJT) in a TO-126 power package, rated for 4A collector current and 40W dissipation. Designed for switching and low-frequency power amplification stages.

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Description
Product Details

BD185 Power Transistor - 4A NPN for Switching & Amplifier Stages

The BD185 is an NPN power transistor housed in the compact TO-126 package, delivering up to 4A of collector current with 40W of power dissipation. It is commonly used in audio amplifier output/driver stages, DC motor control and general-purpose power switching circuits where a small footprint with reasonable current handling is needed.

Functions & Applications

4A Collector Current: Handles moderate load currents for motor drivers and power switching.
40W Power Dissipation: Suited for driver/output stages that need to shed real heat.
Compact TO-126 Package: Small footprint with a metal tab for direct heatsink mounting.
30V Vceo Rating: Sufficient headroom for typical 12V-24V power electronics designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	30V
Max Collector Current (Ic)	4A
Power Dissipation (Pd)	40W
Mounting Type	Through-Hole (THT), heatsink tab

Frequently Asked Questions

Q: Does the BD185 need a heatsink?
A: For any load approaching its 4A/40W ratings, yes - the TO-126 tab should be mounted to a heatsink to avoid thermal shutdown of the junction.

Q: What is the complementary PNP part for BD185?
A: The commonly paired complementary PNP transistor is the BD186.

Notes

For sustained high-current operation, mounting on a suitable heatsink is recommended to stay within safe thermal limits.

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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