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MMST4401 from ROHM

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MMST4401

Manufacturer: ROHM, DIODES

Conductor Holdings Limited - NPN Silicon Epitaxial Planar Transistor

Partnumber Manufacturer Quantity Availability
MMST4401 ROHM, DIODES 5890 In Stock

Description and Introduction

Conductor Holdings Limited - NPN Silicon Epitaxial Planar Transistor # Introduction to the MMST4401 Electronic Component  

The MMST4401 is a widely used NPN bipolar junction transistor (BJT) designed for general-purpose amplification and switching applications. Known for its reliability and performance, this small-signal transistor is commonly employed in low-power circuits, signal processing, and digital logic interfaces.  

With a compact SOT-23 surface-mount package, the MMST4401 is suitable for space-constrained designs while maintaining efficient thermal and electrical characteristics. It features a maximum collector current (Ic) of 600 mA and a collector-emitter voltage (Vceo) rating of 40 V, making it versatile for various low-voltage applications. Additionally, its fast switching speed and moderate gain (hFE) ensure stable operation in both analog and digital circuits.  

The MMST4401 is often used in audio amplifiers, sensor interfaces, and driver circuits due to its consistent performance across a range of operating conditions. Engineers and hobbyists favor this component for its ease of integration and compatibility with automated assembly processes.  

When designing with the MMST4401, proper biasing and heat dissipation should be considered to maximize efficiency and longevity. Its datasheet provides essential parameters such as saturation voltage, transition frequency, and power dissipation limits, aiding in precise circuit implementation.  

Overall, the MMST4401 remains a practical choice for designers seeking a dependable, cost-effective transistor for low-power electronic systems.

Application Scenarios & Design Considerations

Conductor Holdings Limited - NPN Silicon Epitaxial Planar Transistor

Alternative Part Number

  • 2N3904 --: Classic NPN general-purpose transistor with similar current and voltage ratings, widely available and often used as a direct substitute for the 4401 in low-power switching and amplification.
  • BC847 --: SOT-23 NPN transistor with comparable 100 mA current rating and 45 V breakdown, pin-compatible and a common drop-in replacement for MMST4401 in surface-mount designs.
  • PMBT4401 --: Direct equivalent 2N4401-type NPN transistor in SOT-23 package with matching electrical characteristics, suitable when a different manufacturer's 4401 series is acceptable.
  • BC817 --: SOT-23 NPN transistor with 45V/500mA ratings, close electrical characteristics and same package, suitable for most MMST4401 applications.
  • S8050 --: Common NPN transistor with 25V/500mA capability, adequate for low-voltage switching circuits and readily available as an alternative.

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