FMMT458 Datasheet & Equivalents
NPN
SOT-23
General Purpose
DIODES
VCEO
400V
Ic Max
225mA
Pd Max
500mW
hFE Gain
100
Quick Reference
The FMMT458 is a NPN bipolar junction transistor in a SOT-23 package, manufactured by DIODES. It supports a breakdown voltage of 400V and continuous collector current of 225mA. It is widely used in switching and amplification circuits.
Technical Specifications
| Parameter | Value | Description |
|---|---|---|
| Manufacturer | DIODES | Original Manufacturer |
| Package | SOT-23 | Physical mounting |
| Transistor Type | BJT | Bipolar Junction Transistor |
| Category | Single | Configuration |
| Collector-Emitter Voltage (VCEO) | 400V | Max breakdown voltage |
| Collector Current (Ic) | 225mA | Max current handling |
| Power Dissipation (Pd) | 500mW | Max thermal limit |
| DC Current Gain (hFE) | 100 | Base signal amplification ratio |
| Transition Frequency (fT) | 50MHz | 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 | -55℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| FMMT458QTA | NPN | SOT-23 | 400V | 225mA | 100 | 500mW | DIODES 📄 PDF |
| FMMT458TA | NPN | SOT-23 | 400V | 225mA | 100 | 500mW | DIODES 📄 PDF |
| MMBTA44_R1_00001 | NPN | SOT-23 | 400V | 300mA | 50 | 225mW | PANJIT 📄 PDF |
| MMBTA44 | NPN | SOT-23 | 400V | 300mA | 200 | 350mW | JSMSEMI 📄 PDF |
| STR1550 | NPN | SOT-23 | 500V | 500mA | 100 | 500mW | ST 📄 PDF |