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KSP55 from Fairchild,Fairchild Semiconductor

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KSP55

Manufacturer: Fairchild, FSC

PNP Epitaxial Silicon Transistor

Partnumber Manufacturer Quantity Availability
KSP55 Fairchild, FSC 5940 In Stock

Description and Introduction

PNP Epitaxial Silicon Transistor The KSP55 is an NPN bipolar junction transistor (BJT) manufactured by Fairchild Semiconductor. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**  
- **Transistor Type:** NPN  
- **Maximum Collector-Base Voltage (VCB):** 60V  
- **Maximum Collector-Emitter Voltage (VCE):** 50V  
- **Maximum Emitter-Base Voltage (VEB):** 5V  
- **Continuous Collector Current (IC):** 500mA  
- **Total Power Dissipation (PD):** 625mW  
- **DC Current Gain (hFE):** 100–300 (at IC = 10mA, VCE = 1V)  
- **Transition Frequency (fT):** 200MHz (typical)  
- **Operating Temperature Range:** -55°C to +150°C  

### **Description:**  
The KSP55 is a general-purpose NPN transistor designed for amplification and switching applications. It is housed in a TO-92 package, making it suitable for low-power circuits.  

### **Features:**  
- High current gain (hFE)  
- Low saturation voltage  
- Fast switching speed  
- Suitable for driver stages and signal amplification  

This information is based on Fairchild Semiconductor's datasheet for the KSP55 transistor.

Application Scenarios & Design Considerations

PNP Epitaxial Silicon Transistor

Alternative Part Number

  • 2N5551 --: NPN high-voltage transistor with similar 160V rating and pinout, widely available and a common substitute for KSP55 in general switching and amplifier circuits.
  • MMBT5551 --: SMD version of the 2N5551 with comparable voltage and current ratings, suitable when board space is limited and surface-mount assembly is preferred.
  • BC547 --: General-purpose NPN transistor with lower voltage rating but adequate for many low-voltage KSP55 applications, offering broad availability and low cost.
  • MPSA42 --: NPN high-voltage transistor rated 300V, suitable where higher voltage margin is needed in place of the KSP55.

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