TIP121 Datasheet & Equivalents
NPN
TO-220
General Purpose
ST
VCEO
80V
Ic Max
5A
Pd Max
2W
hFE Gain
1000
Quick Reference
The TIP121 is a NPN bipolar junction transistor in a TO-220 package, manufactured by ST. It supports a breakdown voltage of 80V and continuous collector current of 5A. 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) | 80V | Max breakdown voltage |
| Collector Current (Ic) | 5A | Max current handling |
| Power Dissipation (Pd) | 2W | Max thermal limit |
| DC Current Gain (hFE) | 1000 | Base signal amplification ratio |
| Transition Frequency (fT) | - | Max operating frequency |
| Saturation Voltage (VCEsat) | 4V | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | - | Max emitter-base breakdown |
| Collector Cutoff Current | 200uA | Leakage current when OFF |
| Operating Temp | - | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| BD537 | NPN | TO-220 | 80V | 8A | 40 | 50W | SPTECH 📄 PDF |
| D44H11G | NPN | TO-220 | 80V | 10A | 40 | 70W | onsemi 📄 PDF |
| D44H11 | NPN | TO-220 | 80V | 10A | 40 | 50W | SPTECH 📄 PDF |
| D44H11 | NPN | TO-220 | 80V | 10A | 40 | 50W | ST 📄 PDF |
| BD809 | NPN | TO-220 | 80V | 10A | 30 | 90W | SPTECH 📄 PDF |
| TIP122 | NPN | TO-220 | 100V | 5A | 1000 | 2W | Minos 📄 PDF |
| TIP122 | NPN | TO-220 | 100V | 5A | 1000 | 2W | BLUE ROCKET 📄 PDF |
| 2SC2517 | NPN | TO-220 | 100V | 5A | 200 | 30W | SPTECH 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 160 | 65W | OSEN 📄 PDF |
| BD243C | NPN | TO-220 | 100V | 6A | 30 | 65W | SPTECH 📄 PDF |
| TIP41CG | NPN | TO-220 | 100V | 6A | 30 | 65W | onsemi 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 30 | 2W | KTP 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 30 | 2W | luJing |
| BD243CG | NPN | TO-220 | 100V | 6A | 15 | 65W | onsemi 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 15 | 2W | JSCJ 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 15 | 2W | JSMSEMI 📄 PDF |
| TIP41C | NPN | TO-220 | 100V | 6A | 15 | 65W | ST 📄 PDF |
| 2SC2334 | NPN | TO-220 | 100V | 7A | 200 | 40W | SPTECH 📄 PDF |
| TIP102 | NPN | TO-220 | 100V | 8A | 1000 | 2W | ST 📄 PDF |
| TIP102G | NPN | TO-220 | 100V | 8A | 1000 | 2W | onsemi 📄 PDF |