L4947H

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4947H is a monolithic integrated positive fixed linear voltage regulator manufactured by STMicroelectronics. It provides a stable 5V output with a maximum current capability of 500mA. The device features a very low dropout voltage, specified as a maximum of 550mV at the full load current. Internal protection mechanisms include thermal shutdown and current limiting to ensure reliability under fault conditions. The component utilizes a 5-Pentawatt through-hole package, designed for efficient heat dissipation in power supply applications requiring precise voltage regulation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated power-on reset function for system initialization control
• Very low dropout characteristic for efficient operation near input limits
• Built-in thermal shutdown and current limiting protections

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Power supplies for microcontroller-based systems
• Battery-powered equipment requiring stable 5V rails
• Embedded systems needing reliable voltage regulation with reset capabilities

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'H' against the manufacturer's official datasheet to confirm pinout compatibility and package type. Ensure that the required input voltage range exceeds the minimum dropout threshold for your specific load current. Cross-reference the thermal resistance values if operating in high-ambient temperature environments to validate heatsinking requirements.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 5V output is required with moderate current demands up to 500mA. The integrated reset feature makes it suitable for digital logic circuits that require a defined power-up sequence. Consider the Pentawatt package size constraints and thermal management needs compared to smaller surface-mount alternatives if space is limited.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L494x series of low-dropout regulators from STMicroelectronics. These devices are designed using a modular approach to provide robust performance in consumer and industrial electronics. The series typically includes variants with different output voltages and current ratings, sharing common internal protection architectures and reset functionalities.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Check for direct equivalents such as the L4947R or other L4947 variants within the same family. Verify that substitute parts maintain the same 5V output, 500mA rating, and 5-Pentawatt package dimensions to ensure mechanical and electrical compatibility without redesigning the PCB.