BUL128D-B Datasheet & Equivalents
NPN
TO-220
High Power
ST
VCEO
400V
Ic Max
4A
Pd Max
70W
hFE Gain
10
Quick Reference
The BUL128D-B is a NPN bipolar junction transistor in a TO-220 package, manufactured by ST. It supports a breakdown voltage of 400V 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-220 | Physical mounting |
| Transistor Type | BJT | Bipolar Junction Transistor |
| Category | Single | Configuration |
| Collector-Emitter Voltage (VCEO) | 400V | Max breakdown voltage |
| Collector Current (Ic) | 4A | Max current handling |
| Power Dissipation (Pd) | 70W | Max thermal limit |
| DC Current Gain (hFE) | 10 | Base signal amplification ratio |
| Transition Frequency (fT) | - | Max operating frequency |
| Saturation Voltage (VCEsat) | - | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | - | Max emitter-base breakdown |
| Collector Cutoff Current | 500uA | Leakage current when OFF |
| Operating Temp | -65℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| WGD13005 | NPN | TO-220 | 400V | 4A | 10 | 70W | Wild Goose 📄 PDF |
| YFW13005AT | NPN | TO-220 | 400V | 4A | 35 | 2W | YFW 📄 PDF |
| MOT13005DA | NPN | TO-220 | 400V | 4A | 40 | 40W | MOT 📄 PDF |
| MJE13005 | NPN | TO-220 | 400V | 4A | 60 | 75W | SPTECH 📄 PDF |
| 13007B | NPN | TO-220 | 400V | 5A | 40 | 2W | XCH 📄 PDF |
| 2SD799 | NPN | TO-220 | 400V | 6A | 600 | 30W | SPTECH 📄 PDF |
| 2SC3039 | NPN | TO-220 | 400V | 7A | 50 | 50W | SPTECH 📄 PDF |
| 2SC2335 | NPN | TO-220 | 400V | 7A | 80 | 40W | SPTECH 📄 PDF |
| FJP13007H1TU-F080-HXY | NPN | TO-220 | 400V | 8A | 10 | 80W | HXY MOSFET 📄 PDF |
| KSE13007H2SMTU-HXY | NPN | TO-220 | 400V | 8A | 10 | 80W | HXY MOSFET 📄 PDF |
| MJE13006-HXY | NPN | TO-220 | 400V | 8A | 10 | 80W | HXY MOSFET 📄 PDF |
| NTE2312-HXY | NPN | TO-220 | 400V | 8A | 10 | 80W | HXY MOSFET 📄 PDF |
| MJE13007G | NPN | TO-220 | 400V | 8A | 5 | 80W | onsemi 📄 PDF |
| 3DD13007 | NPN | TO-220 | 400V | 8A | 40 | 2W | luJing |
| MJE13007 | NPN | TO-220 | 400V | 8A | 40 | 80W | SPTECH 📄 PDF |
| YFW13007AT | NPN | TO-220 | 400V | 8A | 40 | 2W | YFW 📄 PDF |
| BUL38D | NPN | TO-220 | 450V | 5A | 13 | 80W | ST 📄 PDF |
| KSC5338D | NPN | TO-220 | 450V | 5A | 15 | 75W | onsemi 📄 PDF |
| MJE13005TC314 | NPN | TO-220 | 480V | 4A | - | 75W | GREENMICRO 📄 PDF |