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KST4403 from SAMSUNG

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KST4403

Manufacturer: SAMSUNG, FAIRCHILD, FAIRCHILD, FSC

PNP Epitaxial Silicon Transistor

Partnumber Manufacturer Quantity Availability
KST4403 SAMSUNG, FAIRCHILD, FAIRCHILD, FSC 19537 In Stock

Description and Introduction

PNP Epitaxial Silicon Transistor The part KST4403 is a PNP 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:** PNP  
- **Maximum Collector-Base Voltage (VCB):** -40V  
- **Maximum Collector-Emitter Voltage (VCE):** -40V  
- **Maximum Emitter-Base Voltage (VEB):** -5V  
- **Continuous Collector Current (IC):** -600mA  
- **Total Power Dissipation (PD):** 625mW  
- **DC Current Gain (hFE):** 100 - 300 (at IC = -150mA, VCE = -1V)  
- **Transition Frequency (fT):** 250MHz (typical)  
- **Operating Junction Temperature (TJ):** -55°C to +150°C  
- **Package Type:** TO-92  

### **Descriptions:**  
- The KST4403 is a general-purpose PNP transistor designed for amplification and switching applications.  
- It is commonly used in low-power circuits, signal amplification, and driver stages.  
- The device is characterized by high current gain, low saturation voltage, and fast switching speed.  

### **Features:**  
- High current gain (hFE)  
- Low saturation voltage  
- Fast switching speed  
- Complementary NPN type: KST4401  

This information is based on Fairchild Semiconductor's datasheet for the KST4403 transistor.

Application Scenarios & Design Considerations

PNP Epitaxial Silicon Transistor

Alternative Part Number

  • 2N4403 --: Industry-standard PNP general-purpose transistor with the same electrical ratings and pinout as the KST4403, widely available and directly interchangeable.
  • MMBT4403 --: SMD PNP transistor equivalent to the 2N4403 family, matching voltage and current specs, suitable drop-in replacement where SOT-23 package is acceptable.
  • BC557 --: Common PNP general-purpose transistor with comparable voltage and current ratings, usable as a functional substitute in most low-power switching and amplifier circuits.
  • BC807-40 --: PNP transistor in SOT-23 with comparable 45V/500mA ratings, suitable as an alternative when minor parameter differences are tolerable.

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