BD438 Datasheet & Equivalents
PNP
TO-126
High Power
ST
VCEO
45V
Ic Max
4A
Pd Max
36W
hFE Gain
130
Quick Reference
The BD438 is a PNP bipolar junction transistor in a TO-126 package, manufactured by ST. It supports a breakdown voltage of 45V and continuous collector current of 4A. 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) | 45V | Max breakdown voltage |
| Collector Current (Ic) | 4A | Max current handling |
| Power Dissipation (Pd) | 36W | Max thermal limit |
| DC Current Gain (hFE) | 130 | Base signal amplification ratio |
| Transition Frequency (fT) | 3MHz | Max operating frequency |
| Saturation Voltage (VCEsat) | - | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | - | Max emitter-base breakdown |
| Collector Cutoff Current | - | Leakage current when OFF |
| Operating Temp | -65℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| BD438S | PNP | TO-126 | 45V | 4A | 140 | 36W | onsemi 📄 PDF |
| KTB1151-Y-U/PH | PNP | TO-126 | 60V | 5A | 160 | 20W | KEC 📄 PDF |
| BD680ASTU-HXY | PNP | TO-126 | 80V | 4A | - | 2W | HXY MOSFET 📄 PDF |