onsemi NST3904DXV6T1G General-Purpose NPN Bipolar Transistor: Datasheet, Applications, and SMT Characteristics

The onsemi NST3904DXV6T1G is a quintessential general-purpose NPN bipolar junction transistor (BJT) packaged in an ultra-miniature SC-70-6 (SOT-363) package. This device epitomizes the modern evolution of the legendary 2N3904, engineered to meet the demanding size and performance requirements of today's compact electronic designs. It is designed primarily for amplification and switching applications, offering a robust combination of performance and reliability in a minimal footprint.

Datasheet Overview and Key Specifications

A thorough review of the datasheet reveals the transistor's core electrical characteristics, which are critical for circuit design and validation.

Current Gain (hFE): This parameter, which indicates amplification capability, is typically 100 to 300 at a collector current (IC) of 10mA and a collector-emitter voltage (VCE) of 1.0V. This range ensures sufficient gain for a wide array of low-signal applications.

Voltage Ratings: The device features a collector-emitter voltage (VCEO) of 40V and a collector-base voltage (VCBO) of 60V, providing ample headroom for low-voltage circuits in consumer and industrial applications.

Current Handling: The continuous collector current (IC) is rated at 200mA, making it suitable for driving relays, LEDs, and other small loads.

Power Dissipation: The maximum power dissipation is 150mW at 25°C, a key consideration for thermal management in densely packed boards.

Surface-Mount Technology (SMT) Characteristics

The NST3904DXV6T1G is specifically designed for high-volume automated assembly processes. Its SC-70-6 package is one of its most significant features. This package is not only extremely small, saving valuable PCB real estate, but its six leads also provide a more robust mechanical connection to the board compared to smaller three-lead packages. Furthermore, the package's design offers improved thermal performance, helping to dissipate heat effectively despite its miniature size. This makes it an ideal choice for portable electronics, IoT devices, and other space-constrained applications.

Primary Applications

This transistor's versatility allows it to be deployed in a vast number of circuit configurations. Its most common applications include:

Low-Power Amplification: Used in small-signal amplifier stages for audio pre-amplification and signal processing.

High-Speed Switching: Its fast switching speeds make it effective for digital logic interfacing, pulse generation, and driving small inductive loads.

Load Driving: Directly driving components such as LEDs, small relays, and motors within its current and power limits.

Automated Assembly: Its SMT package makes it a perfect candidate for high-volume manufacturing across consumer electronics, automotive modules, and industrial control systems.

ICGOODFIND Summary

The onsemi NST3904DXV6T1G successfully modernizes the classic 2N3904 transistor for the surface-mount era. It delivers proven, general-purpose BJT performance—suitable for both amplification and switching—in an exceptionally small SC-70-6 package. Its robust voltage and current ratings, combined with its suitability for automated PCB assembly, make it a fundamental and highly reliable component for designers aiming to minimize space without compromising on functionality.

Keywords:

NPN Transistor

Surface-Mount Technology

SC-70-6

General-Purpose Amplification

High-Speed Switching