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BD139 AI Analysis:
Datasheet, Specs, Alternatives & ECAD

AI summary

BD139 product

BD139

Transistors - Bipolar (BJT) - Single

NPNTransistorAudioPower

The BD139 is a standard NPN power transistor in a SOT-32 package, widely used in audio amplifier driver stages.

Best for

  • Audio power amplifiers
  • General purpose switching

Avoid if

  • High-frequency RF applications
  • Space-constrained surface-mount designs

Check before use

  • Thermal management requirements
  • Gain group classification

Key specifications

VCEO
80 V
IC
1.5 A
Package
SOT-32

Compliance & Environment

RoHS
RoHS non-compliant
REACH
REACH Unaffected
MSL
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.29.0095

Application

Audio AmplifiersDriver Circuits

Datasheet

Fairchild-Semiconductor-company-11.pdf

800 KB

Datasheet AI

CAD Models

Download ECAD models for BD139: KiCad symbol & footprint, Altium footprint, PCB footprint, and 3D model.

EDA Symbol
Schematic symbol for your EDA tool
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PCB Footprint
Land pattern for PCB layout
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3D Model
STEP file for mechanical design
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KiCad Library
Verified KiCad 8 symbol, footprint, and 3D model
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Where to Buy

Real-time and catalog pricing from verified distributors

Live prices updated on demand · Catalog (~) prices may differ

Alternative components

Alternatives are being enriched. Analyze this part in PartGenie for the latest matches.

Design and risk insights

Questions & answers

It is primarily used in audio amplifier circuits and as a driver transistor in complementary or quasi-complementary output stages.