BD139 Datasheet & Equivalents
NPN
TO-126
High Power
ST
VCEO
80V
Ic Max
1.5A
Pd Max
12.5W
hFE Gain
63
Quick Reference
The BD139 is a NPN bipolar junction transistor in a TO-126 package, manufactured by ST. It supports a breakdown voltage of 80V and continuous collector current of 1.5A. It is widely used in switching and amplification circuits.
Technical Specifications
| Parameter | Value | Description |
|---|---|---|
| Manufacturer | ST | Original Manufacturer |
| Package | TO-126 | Physical mounting |
| Transistor Type | BJT | Bipolar Junction Transistor |
| Category | Single | Configuration |
| Collector-Emitter Voltage (VCEO) | 80V | Max breakdown voltage |
| Collector Current (Ic) | 1.5A | Max current handling |
| Power Dissipation (Pd) | 12.5W | Max thermal limit |
| DC Current Gain (hFE) | 63 | Base signal amplification ratio |
| Transition Frequency (fT) | - | Max operating frequency |
| Saturation Voltage (VCEsat) | 500mV | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | 5V | Max emitter-base breakdown |
| Collector Cutoff Current | 10uA | Leakage current when OFF |
| Operating Temp | -65℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| BD139-16 | NPN | TO-126 | 80V | 1.5A | 160 | 12.5W | YFW 📄 PDF |
| BD140 | NPN | TO-126 | 80V | 1.5A | 200 | 1W | HXY MOSFET 📄 PDF |
| BD13916STU-HXY | NPN | TO-126 | 80V | 1.5A | 250 | 1W | HXY MOSFET 📄 PDF |
| MJE182 | NPN | TO-126 | 80V | 3A | 250 | 12.5W | GOODWORK 📄 PDF |
| TTC004B | NPN | TO-126 | 160V | 1.5A | 140 | 1.5W | TOSHIBA 📄 PDF |