L4947PD013TR

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

The L4947PD013TR is a monolithic integrated circuit from STMicroelectronics, classified as a linear low-dropout (LDO) voltage regulator. It provides a fixed positive output of 5V with a maximum continuous current capability of 500mA. The device is housed in a 5-Pentawatt through-hole package and operates within an input voltage range up to 26V. It features a typical quiescent current of 13mA and supports a junction temperature range from -40°C to +125°C. Key electrical specifications include a maximum dropout voltage of 0.75V at full load and a power supply rejection ratio of 60dB at 120Hz.

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

• Integrates a reset function for microprocessor-based systems with externally programmable delay
• Provides robust protection against overvoltage conditions including +80V and -80V load dump
• Includes reverse voltage protection, short-circuit protection, and thermal shutdown with hysteresis

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

• Automotive electronic systems requiring stable supply during cranking phases
• Industrial electronic systems needing precise 5V regulation
• Microprocessor power supply circuits requiring power-on reset signals

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

Verify component authenticity by checking the manufacturer marking code and date code against official STMicroelectronics documentation. Confirm the Pentawatt-5 package orientation and pin configuration matches the datasheet schematic. Ensure storage conditions comply with moisture sensitivity level requirements prior to soldering. Cross-reference the specific suffix with the latest product selection guide to confirm availability status.

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

Select this component when a fixed 5V output with high current capability is required for automotive or industrial environments. The Pentawatt package offers superior thermal dissipation compared to smaller surface-mount alternatives. Consider the integrated reset feature if direct microprocessor control signaling is needed without additional logic gates. Evaluate the input voltage range to ensure compatibility with the system's battery rail or power source variations.

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

The L4947 series belongs to STMicroelectronics' family of very low drop regulators designed for harsh environments. This specific part number denotes the standard fixed 5V version packaged in the industry-standard Pentawatt format. It is engineered to handle the transient voltage spikes common in automotive applications while maintaining stable output under varying load conditions.

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

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with any alternative components by matching the output voltage, current rating, package type, and protection features.