Introduction

The MMBT5551 is a popular NPN bipolar junction transistor in a compact SOT-23 surface mount package, making it ideal for space-constrained PCBs in mobile devices, IoT modules, and handheld devices. It is widely used in amplification, switching, and signal conditioning applications due to its high current gain, low saturation voltage drop, and reliable performance.

Key Features

  • Transistor Type: NPN
  • Package: SOT-23
  • Maximum Collector Current (Ic): 600mA
  • Collector-Emitter Voltage (Vceo): 160V
  • Power Dissipation (Pd): 300mW
  • DC Current Gain (hFE): 100-300
  • High-speed switching capability
  • Low noise performance

MMBT5551 Datasheet

MMBT5551Download

Pinout Configuration

The MMBT5551 comes in an SOT-23 package with three pins:

  • Emitter (E) – Connected to ground or negative supply
  • Base (B) – Controls the transistor’s switching/amplification
  • Collector (C) – Connects to the load or positive supply

Typical Applications

  • Signal amplification in analog circuits
  • High-speed switching in digital circuits
  • DC-DC converters and voltage regulators
  • LED driver circuits
  • Consumer electronics
  • Communication equipment
  • Embedded systems and microcontroller interfacing

Product Line

For more product details, please visit our official website:

https://en.semiware.com/small-signal-transis/mmbt5551

About Semiware
Semiware has a comprehensive product lineup of circuit protection device products. The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website: https://en.semiware.com/