LDL40PU50RY

Overview

The LDL40PU50RY is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 5 V output with a maximum continuous current of 200 mA. The device supports an input voltage range from 3.3 V to 40 V, enabling operation in automotive environments subject to load dump transients. It features ultra-low quiescent current of 2 µA at no load and less than 0.3 µA in shutdown mode. The regulator includes internal protections such as thermal shutdown, overcurrent protection, and output active discharge. It is qualified to AEC-Q100 Grade 1 standards and operates within a junction temperature range of -40 °C to +150 °C.

Feature Summary

• High accuracy voltage regulation suitable for direct connection to car batteries or industrial power sources
• Extended input voltage capability up to 40 V to withstand automotive load dump conditions
• Ultra-low ground current consumption to extend battery life in always-on standby systems
• Automotive-grade reliability with AEC-Q100 Grade 1 qualification and wide operating temperature range

Applications

• Battery-powered automotive electronic modules
• Industrial always-on standby equipment
• Portable healthcare devices requiring clean power supplies

Procurement Notes

Verify the specific suffix 'R' indicates reel packaging and 'Y' denotes tape-and-reel configuration when ordering. Confirm that the DFN6 package variant matches your PCB footprint requirements. Ensure input and output capacitor selections meet stability criteria specified in the official datasheet. Check for RoHS compliance status relevant to your manufacturing region. Validate that the fixed 5 V output aligns with your system design constraints before finalizing procurement.

Selection Notes

Select this component when a fixed 5 V rail is required with high input voltage tolerance up to 40 V. It is appropriate for designs prioritizing low static current to maximize battery longevity in portable applications. Consider this part if AEC-Q100 Grade 1 certification is mandatory for automotive integration. Choose this regulator over adjustable versions when circuit complexity reduction is desired by eliminating external feedback resistors.

Part Context

This device belongs to the LDL40 family of low-dropout regulators designed for high-voltage automotive and industrial applications. The family offers various output voltages and adjustable options within the same DFN6 footprint. It shares core architectural features with other members like LDL40PUR but differs in fixed output configuration. The series emphasizes space-saving design with wettable flank packages for automated optical inspection compatibility.

Replacement Considerations

LDL40PU33RY provides a fixed 3.3 V output with identical electrical characteristics and packaging. LDQ40PU50RY offers a similar 5 V fixed output but supports 250 mA current and uses the LDQ40 series specifications. LDL40PURY is the adjustable version of the same package, allowing voltage setting between 1.2 V and 12 V.