BU508AF Datasheet & Equivalents
NPN
TO-3P
High Power
ST
VCEO
700V
Ic Max
8A
Pd Max
50W
hFE Gain
5
Quick Reference
The BU508AF is a NPN bipolar junction transistor in a TO-3P package, manufactured by ST. It supports a breakdown voltage of 700V and continuous collector current of 8A. It is widely used in switching and amplification circuits.
Technical Specifications
| Parameter | Value | Description |
|---|---|---|
| Manufacturer | ST | Original Manufacturer |
| Package | TO-3P | Physical mounting |
| Transistor Type | BJT | Bipolar Junction Transistor |
| Category | Single | Configuration |
| Collector-Emitter Voltage (VCEO) | 700V | Max breakdown voltage |
| Collector Current (Ic) | 8A | Max current handling |
| Power Dissipation (Pd) | 50W | Max thermal limit |
| DC Current Gain (hFE) | 5 | Base signal amplification ratio |
| Transition Frequency (fT) | - | Max operating frequency |
| Saturation Voltage (VCEsat) | 1V | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | - | Max emitter-base breakdown |
| Collector Cutoff Current | 2mA | Leakage current when OFF |
| Operating Temp | -65℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| BUH517 | NPN | TO-3P | 700V | 8A | 6 | 60W | SPTECH 📄 PDF |
| BU508A | NPN | TO-3P | 700V | 8A | 30 | 125W | SPTECH 📄 PDF |
| 2SC5297 | NPN | TO-3P | 800V | 8A | 30 | 60W | SPTECH 📄 PDF |
| 2SC3307 | NPN | TO-3P | 800V | 10A | 10 | 150W | SPTECH 📄 PDF |
| 2SD1887 | NPN | TO-3P | 800V | 10A | 10 | 70W | SPTECH 📄 PDF |
| 2SC5299 | NPN | TO-3P | 800V | 10A | 30 | 70W | SPTECH 📄 PDF |
| FJL6920 | NPN | TO-3P | 800V | 20A | 8 | 200W | SPTECH 📄 PDF |
| 2SC3998 | NPN | TO-3P | 800V | 20A | 40 | 200W | XCH 📄 PDF |