MMBTH81 Transistor

Introduction

The MMBTH81 is a bipolar junction transistor (BJT) that belongs to the category of small signal transistors. It is commonly used in electronic circuits for amplification and switching purposes due to its high frequency and low power characteristics.

Basic Information Overview

• Category: Small Signal Transistor
• Use: Amplification and Switching
• Characteristics: High Frequency, Low Power
• Package: SOT-23
• Essence: NPN Transistor
• Packaging/Quantity: Typically available in reels of 3000 units

Specifications

• Maximum Collector-Base Voltage (Vcb): 40V
• Maximum Collector-Emitter Voltage (Vce): 40V
• Maximum Emitter-Base Voltage (Veb): 5V
• Continuous Collector Current (Ic): 0.1A
• Power Dissipation (Pd): 225mW
• Transition Frequency (ft): 250MHz

Detailed Pin Configuration

The MMBTH81 transistor has three pins: 1. Collector (C): Connected to the positive supply voltage in most applications. 2. Base (B): The input terminal for controlling the flow of current between the collector and emitter. 3. Emitter (E): Connected to the ground or common reference point in most applications.

Functional Features

• High transition frequency enables its use in high-frequency applications.
• Low power dissipation makes it suitable for battery-operated devices.
• Small SOT-23 package allows for compact circuit designs.

Advantages and Disadvantages

Advantages

• High frequency capability
• Low power consumption
• Compact package size

Disadvantages

• Limited maximum collector current
• Limited maximum voltage ratings

Working Principles

The MMBTH81 operates based on the principles of bipolar junction transistors, where the flow of current between the collector and emitter is controlled by the base current. In amplification applications, small variations in the base current result in larger variations in the collector current, enabling signal amplification. In switching applications, the transistor can be turned on and off by controlling the base current, allowing it to act as a digital switch.

Detailed Application Field Plans

The MMBTH81 transistor finds extensive use in various electronic applications, including: - Radio frequency (RF) amplifiers - Oscillators - Signal processing circuits - Low-power switching circuits

Detailed and Complete Alternative Models

Some alternative models to the MMBTH81 transistor include: - 2N3904 - BC547 - 2SC945 - PN2222

In conclusion, the MMBTH81 transistor is a versatile component with high-frequency capabilities and low power consumption, making it suitable for a wide range of electronic applications.

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