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MPSA77 from Fairchild,Fairchild Semiconductor

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MPSA77

Manufacturer: Fairchild, ZETEX, KEC

Leaded Small Signal Transistor Darlington

Partnumber Manufacturer Quantity Availability
MPSA77 Fairchild, ZETEX, KEC 2990 In Stock

Description and Introduction

Leaded Small Signal Transistor Darlington # Introduction to the MPSA77 Transistor  

The **MPSA77** is a high-voltage, low-noise **PNP bipolar junction transistor (BJT)** designed for general-purpose amplification and switching applications. Known for its reliability and performance, this component is commonly used in audio amplifiers, signal processing circuits, and power management systems where stable operation under varying conditions is essential.  

### Key Features  
- **High Voltage Capability:** The MPSA77 can handle collector-emitter voltages (VCEO) up to **-80V**, making it suitable for circuits requiring moderate power handling.  
- **Low Noise Performance:** Its optimized design minimizes electrical noise, which is crucial for audio and sensitive signal amplification.  
- **Moderate Current Rating:** With a collector current (IC) of **-500mA**, it balances power handling and efficiency in small to medium-power applications.  
- **Complementary Pair:** Often paired with the **MPSA07 (NPN)** for push-pull amplifier configurations.  

### Applications  
The MPSA77 is widely used in:  
- **Audio amplifiers** (preamp and driver stages)  
- **Signal conditioning circuits**  
- **Voltage regulators and power supplies**  
- **Switching circuits** in industrial and consumer electronics  

### Packaging and Availability  
The transistor is typically available in a **TO-92** package, ensuring easy integration into through-hole PCB designs. Its robust construction and consistent performance make it a preferred choice for engineers and hobbyists working on analog and low-power digital circuits.  

With its balanced specifications, the MPSA77 remains a versatile and dependable component in electronic design.

Application Scenarios & Design Considerations

Leaded Small Signal Transistor Darlington

Alternative Part Number

  • BC516 --: PNP Darlington transistor with similar current gain and voltage ratings, widely available and commonly used as a substitute for MPSA77.
  • 2N6426 --: PNP Darlington transistor offering comparable collector-emitter voltage and current handling, suitable for general switching and amplification.
  • MMBTA64 --: PNP Darlington transistor in SOT-23 package with similar electrical characteristics, good alternative when a surface-mount option is acceptable.
  • 2N6427 --: PNP Darlington transistor offering similar collector current and voltage characteristics, suitable as a functional replacement.
  • 2N3906 --: Widely available PNP general-purpose transistor with similar small-signal switching characteristics and low cost.
  • BC557 --: Common PNP transistor suitable for general amplification and switching, often used as a substitute in low-power circuits.
  • MMBT2907A --: SMD PNP transistor with comparable voltage and current ratings, good for space-constrained replacements.

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