SMMBT3904LT1G - English Editing Encyclopedia Entry

Product Overview

The SMMBT3904LT1G belongs to the category of small signal transistors and is commonly used in electronic circuits for amplification and switching purposes. This NPN bipolar junction transistor (BJT) exhibits characteristics such as high voltage gain, low noise, and fast switching speed. It is typically packaged in a small SOT-23 package and is available in tape and reel packaging with a quantity of 3000 units per reel.

Specifications

• Maximum Collector-Base Voltage: 40V
• Maximum Collector Current: 200mA
• Power Dissipation: 225mW
• Transition Frequency: 250MHz
• Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The SMMBT3904LT1G features three pins: the emitter, base, and collector. In the SOT-23 package, the pin configuration is as follows: - Pin 1: Emitter - Pin 2: Base - Pin 3: Collector

Functional Features

This transistor offers high amplification capabilities, making it suitable for use in audio amplifiers, signal processing circuits, and radio frequency (RF) applications. Its fast switching speed enables efficient digital switching in logic circuits and pulse generation.

Advantages and Disadvantages

Advantages

• High voltage gain
• Low noise
• Fast switching speed
• Small form factor

Disadvantages

• Limited power handling capability
• Susceptible to thermal runaway at high currents

Working Principles

The SMMBT3904LT1G operates based on the principles of bipolar junction transistors. When a small current flows into the base terminal, it controls a much larger current between the collector and emitter terminals, allowing for amplification or switching of signals.

Detailed Application Field Plans

Audio Amplification

In audio amplification circuits, the SMMBT3904LT1G can be used to amplify weak audio signals from microphones or musical instruments before they are sent to speakers or headphones.

Signal Processing Circuits

This transistor is suitable for use in various signal processing applications, including filters, oscillators, and mixers, due to its low noise characteristics and high gain.

RF Applications

For RF applications such as wireless communication systems, the SMMBT3904LT1G can be employed in RF amplifiers and modulators to process high-frequency signals.

Detailed and Complete Alternative Models

• BC547B
• 2N2222A
• PN2222A
• 2N3904

In conclusion, the SMMBT3904LT1G is a versatile small signal transistor with high voltage gain, low noise, and fast switching speed, making it suitable for a wide range of electronic applications. While it has limitations in power handling, its compact size and performance characteristics make it an essential component in modern electronic designs.

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