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LM340K-12 from NSC,National Semiconductor

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LM340K-12

Manufacturer: NSC, NS

Series 3-Terminal Positive Regulators

Partnumber Manufacturer Quantity Availability
LM340K-12,LM340K12 NSC, NS 79 In Stock

Description and Introduction

Series 3-Terminal Positive Regulators The LM340K-12 is a positive voltage regulator manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Output Voltage:** 12V  
- **Output Current:** 1.5A (with proper heat sinking)  
- **Input Voltage Range:** Up to 35V  
- **Line Regulation:** 0.01% (typical)  
- **Load Regulation:** 0.3% (typical)  
- **Dropout Voltage:** 2V (typical)  
- **Operating Temperature Range:** 0°C to +125°C  
- **Package:** TO-3 (metal can)  

### **Descriptions:**  
The LM340K-12 is a fixed 12V linear voltage regulator designed to provide stable output voltage with minimal external components. It includes thermal overload protection, short-circuit protection, and safe operating area (SOA) protection.  

### **Features:**  
- **Fixed 12V Output**  
- **Thermal Overload Protection**  
- **Short-Circuit Protection**  
- **Internal Current Limiting**  
- **High Ripple Rejection**  
- **TO-3 Package for Efficient Heat Dissipation**  

This regulator is commonly used in power supply applications requiring a stable 12V output.

Application Scenarios & Design Considerations

Series 3-Terminal Positive Regulators

Alternative Part Number

  • MC7812CT --: Industry-standard 12V fixed linear regulator in TO-220, pin-compatible with LM340K-12 and widely available.
  • L7812CV --: 12V positive voltage regulator in TO-220 with same pinout and electrical characteristics, a common drop-in replacement.
  • UA7812CKCS --: 12V fixed regulator in TO-220 package offering equivalent performance and pin compatibility for LM340K-12 applications.

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