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L4938N from ST,ST Microelectronics

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L4938N

Manufacturer: ST, STM

DUAL MULTIFUNCTION VOLTAGE REGULATOR

Partnumber Manufacturer Quantity Availability
L4938N ST, STM 287 In Stock

Description and Introduction

DUAL MULTIFUNCTION VOLTAGE REGULATOR The L4938N is a low-drop voltage regulator manufactured by STMicroelectronics (STM). Here are its key specifications, descriptions, and features:

### **Specifications:**  
- **Output Voltage Options:** 5V, 8V, 10V, 12V (fixed versions).  
- **Output Current:** Up to 250mA.  
- **Dropout Voltage:** Typically 0.4V at full load.  
- **Input Voltage Range:** Up to 28V.  
- **Low Quiescent Current:** Typically 300µA.  
- **Low Standby Current:** Less than 10µA in OFF mode.  
- **Operating Temperature Range:** -40°C to +125°C.  
- **Package:** DIP-8 or SO-8.  

### **Descriptions:**  
- The L4938N is a monolithic integrated voltage regulator designed for low-power applications.  
- It includes protection features such as thermal shutdown, short-circuit protection, and reverse polarity protection.  
- Suitable for automotive and industrial applications due to its robustness.  

### **Features:**  
- **Very Low Dropout Voltage:** Ensures efficient regulation even with small input-output differentials.  
- **Low Quiescent Current:** Ideal for battery-powered devices.  
- **Thermal Protection:** Prevents damage from overheating.  
- **Short-Circuit Protection:** Safeguards the regulator and connected circuitry.  
- **Reverse Polarity Protection:** Protects against incorrect power supply connections.  
- **Enable Function:** Allows the regulator to be turned on/off via an external control signal.  

This information is based on the manufacturer's datasheet for the L4938N.

Application Scenarios & Design Considerations

DUAL MULTIFUNCTION VOLTAGE REGULATOR

Alternative Part Number

  • LM2940CT-5.0 --: Widely available 5V low-dropout linear regulator in TO-220, functionally similar to the L4938N and easy to source as a drop-in style replacement.
  • MC33269DT-5.0G --: 5V LDO regulator with comparable current capability and thermal behavior, suitable substitute when the L4938N is unavailable.
  • L78L05ACZ --: Simple 5V linear regulator from a different series, usable in less demanding loads where the L4938N's low-dropout feature is not critical.
  • LM2931AZ-5.0 --: Low-dropout 5V linear regulator in TO-92 with similar current capability and pinout, widely available and a common substitute for the L4938N.
  • MC33269D-5.0 --: 5V low-dropout regulator with comparable dropout voltage and output current, suitable drop-in replacement in many L4938N applications.

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