FMMT491ATA Datasheet & Equivalents
NPN
SOT-23
General Purpose
DIODES
VCEO
40V
Ic Max
1A
Pd Max
500mW
hFE Gain
200
Quick Reference
The FMMT491ATA is a NPN bipolar junction transistor in a SOT-23 package, manufactured by DIODES. It supports a breakdown voltage of 40V and continuous collector current of 1A. 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) | 40V | Max breakdown voltage |
| Collector Current (Ic) | 1A | Max current handling |
| Power Dissipation (Pd) | 500mW | Max thermal limit |
| DC Current Gain (hFE) | 200 | Base signal amplification ratio |
| Transition Frequency (fT) | 150MHz | Max operating frequency |
| Saturation Voltage (VCEsat) | 500mV | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | 7V | Max emitter-base breakdown |
| Collector Cutoff Current | 100nA | Leakage current when OFF |
| Operating Temp | -55℃~+150℃ | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| FMMT491ATC | NPN | SOT-23 | 40V | 1A | 200 | 500mW | DIODES 📄 PDF |
| ZXTN2040FTA | NPN | SOT-23 | 40V | 1A | 200 | 310mW | DIODES 📄 PDF |
| PBSS4140T | NPN | SOT-23 | 40V | 1A | 300 | 450mW | Nexperia 📄 PDF |
| 215 | NPN | SOT-23 | 40V | 1.5A | 400 | 300mW | XCH 📄 PDF |
| SS8050 | NPN | SOT-23 | 40V | 2A | 200 | 460mW | onsemi 📄 PDF |
| NSS40201LT1G | NPN | SOT-23 | 40V | 2A | 200 | 300mW | Slkor 📄 PDF |
| SS30101-Q | NPN | SOT-23 | 40V | 2A | 300 | 730mW | DIODES 📄 PDF |
| DSS4240T-7 | NPN | SOT-23 | 40V | 2A | 300 | 730mW | DIODES 📄 PDF |
| ZXTN4240F-7 | NPN | SOT-23 | 40V | 2A | - | 300mW | GOODWORK |
| PBSS4240 | NPN | SOT-23 | 50V | 1.25A | 200 | 500mW | DIODES 📄 PDF |
| FMMTL619TA | NPN | SOT-23 | 50V | 1.5A | 100 | 225mW | LRC 📄 PDF |
| LH8050QLT1G | NPN | SOT-23 | 50V | 2A | 200 | 625mW | DIODES 📄 PDF |
| FMMT619TA | NPN | SOT-23 | 50V | 2A | 200 | 625mW | DIODES 📄 PDF |
| FMMT619TC | NPN | SOT-23 | 50V | 2A | 200 | 350mW | JSCJ 📄 PDF |
| FMMT619 | NPN | SOT-23 | 50V | 2A | 120 | 350mW | UTC 📄 PDF |
| 2SC2655G-Y-AE3-R | NPN | SOT-23 | 50V | 2A | 300 | 625mW | HXY MOSFET 📄 PDF |
| DSS4240T-7-HXY | NPN | SOT-23 | 50V | 2A | 300 | 350mW | HXY MOSFET 📄 PDF |
| FMMT4240-HXY | NPN | SOT-23 | 50V | 2A | 300 | 625mW | JSMSEMI 📄 PDF |
| FMMT619-JSM | NPN | SOT-23 | 50V | 2A | 300 | 350mW | HXY MOSFET 📄 PDF |
| FMMT619TA-HXY | NPN | SOT-23 | 50V | 2A | 100 | 300mW | Nexperia 📄 PDF |