Is there a pin-compatible replacement for LDL1117S50R?

Based on this review, no direct pin-compatible replacements in the same SOT223 package were identified. All evaluated candidates require a PCB layout modification due to different package footprints.

What risks should I check before replacing LDL1117S50R?

Key risks include: 1) Package Mismatch: All candidates have different footprints requiring a board respin. 2) Dropout Voltage: Many alternatives are not LDOs and need a higher input voltage. 3) Thermal Performance: A different package will have different thermal characteristics.

LDL1117S50R Alternatives, Datasheet & Cross Reference | STMicroelectronics

Finding a substitute for the LDL1117S50R, a 1.2A low-dropout regulator in a SOT223 package, requires careful review of both electrical performance and physical footprint. While several 5V regulators exist, matching the low dropout voltage and package is critical.

AI replacement insight

Package riskhigh

Requires board redesign; no drop-in package found.

Electrical riskmedium

Some candidates are not LDOs; dropout voltage and input range must be verified.

Sourcing risklow

Multiple vendors offer functionally similar parts, though package and performance vary.

Can it be replaced directly?

No direct, pin-for-pin replacement was found. All alternatives require a board redesign.

Best replacement path

Use LM29150RS-5.0 with a required PCB layout modification.

Main risk

The primary risk is the package mismatch, as no candidates share the target's SOT223 footprint, making a board redesign necessary.

Recommended alternatives

Strongest electrical match; an LDO with similar dropout and higher current, but in a different package.

View details

Alternative comparison matrix

Feature / factor	LDL1117S50R	LM29150RS-5.0	BL8072COTR50	Compatibility / risk
Package	SOT223	TO-252	TO-252	TO-252 — Requires PCB redesign.; BL8072COTR50: Requires PCB redesign.
Current	1.2 A	1.5 A	2.0 A	1.5 A / 2.0 A — Candidate provides higher output current.; BL8072COTR50: Candidate provides higher output current.
Dropout Voltage	350 mV	~350 mV	1.0 V	~350 mV / 1.0 V — Excellent LDO performance match.; BL8072COTR50: Candidate is an LDO but with much higher dropout.
Voltage	18 V	26 V	-	26 V — Candidate has higher max input voltage.

Application & sourcing insights

Questions & answers

The LM29150RS-5.0 is the closest electrical alternative, offering a similar low dropout voltage and higher current capacity. However, it comes in a TO-252 package and requires a PCB layout change.