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MPS3904 from PHI,Philips

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MPS3904

Manufacturer: PHI, NXP

General Purpose Transistor

Partnumber Manufacturer Quantity Availability
MPS3904 PHI, NXP 10050 In Stock

Description and Introduction

General Purpose Transistor # Introduction to the MPS3904 Transistor  

The **MPS3904** is a widely used **NPN bipolar junction transistor (BJT)** designed for general-purpose amplification and switching applications. Known for its reliability and versatility, this small-signal transistor is commonly found in consumer electronics, industrial circuits, and hobbyist projects.  

## Key Features  

- **High Current Gain (hFE):** Typically ranging between 100 and 300, making it suitable for low-power amplification.  
- **Low Voltage Operation:** Supports collector-emitter voltages (V_CE) up to **40V** and collector currents (I_C) up to **200mA**.  
- **Fast Switching Speed:** Effective for digital logic and signal processing applications.  
- **Compact Package:** Available in **TO-92** packaging, facilitating easy integration into circuit designs.  

## Common Applications  

The MPS3904 is frequently employed in:  
- **Audio amplifiers** (pre-amplification stages)  
- **Signal switching circuits**  
- **Voltage regulators and drivers**  
- **Sensor interfacing**  

## Pin Configuration  

The transistor follows the standard **E-B-C (Emitter-Base-Collector)** pinout in the TO-92 package. Proper biasing is essential for optimal performance in amplification roles.  

## Considerations  

While the MPS3904 is robust for low-power applications, designers should ensure it operates within its specified limits to avoid thermal damage. Complementary PNP transistors, such as the **MPS3906**, are often paired with the MPS3904 for push-pull configurations.  

Due to its affordability and widespread availability, the MPS3904 remains a staple in electronic design, offering a balance of performance and simplicity.

Application Scenarios & Design Considerations

General Purpose Transistor

Alternative Part Number

  • 2N3904 --: Industry-standard NPN general-purpose transistor with nearly identical Vceo, Ic, and hFE specs; widely available and pin-compatible.
  • BC547 --: Common NPN small-signal transistor with comparable current gain and voltage ratings; suitable for most MPS3904 switching and amplification uses.
  • MMBT3904 --: SMD version of the 3904 family with matching electrical characteristics; good drop-in for surface-mount designs needing the same transistor type.
  • PN2222A --: Popular NPN switching transistor with similar electrical characteristics and TO-92 package, a practical drop-in for general-purpose applications.

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