Is there a pin-compatible replacement for NCP1117DT50RKG?

LR7805D uses the same DPAK package and is likely pin-compatible, as 3-pin regulators are highly standardized. However, verification against the datasheet is required before assembly as it is not an official replacement.

What risks should I check before replacing NCP1117DT50RKG?

Key risks include: 1) Package compatibility (ensure the substitute fits the DPAK footprint). 2) Dropout voltage (the target is an LDO; many alternatives are not and require higher input voltage). 3) Maximum input voltage and thermal performance.

NCP1117DT50RKG Alternatives, Datasheet & Cross Reference | onsemi

NCP1117DT50RKG is a popular 5V, 1A low-dropout (LDO) regulator in a DPAK package. Finding a substitute requires matching its LDO characteristics, especially the low dropout voltage, and its DPAK footprint.

AI replacement insight

Electrical riskhigh

Dropout voltage mismatch is the most critical electrical risk.

Package riskmedium

Some candidates use DPAK-3 which requires footprint verification against DPAK.

Sourcing risklow

Many functional alternatives exist for 5V/1A regulators.

Can it be replaced directly?

No verified direct drop-in replacement is available. Candidates like LR7805D have a matching package but require pinout and dropout voltage verification before use.

Best replacement path

Prioritize other 1117-series LDOs in a DPAK package. If unavailable, 7805-series regulators in DPAK are functional but have higher dropout voltage, requiring system-level input voltage checks.

Main risk

The primary risk is substituting a standard regulator (like a 7805) for this LDO (1117), which can cause malfunction if the input-to-output voltage differential is small.

Recommended alternatives

A functional alternative in the same DPAK package with a higher input voltage rating, but with higher dropout voltage.

View details

Alternative comparison matrix

Feature / factor	NCP1117DT50RKG	LR7805D	MC7805CDTRKG	NCV7805BDTRKG	Compatibility / risk
Package	DPAK (TO-252)	DPAK (TO-252)	DPAK-3	DPAK-3	DPAK (TO-252) / DPAK-3 — Package matches, increasing likelihood of fit.; MC7805CDTRKG: Package name differs. DPAK-3 is usually compatible with DPAK but requires verification.; NCV7805BDTRKG: Package name differs. DPAK-3 is usually compatible with DPAK but requires verification.
Voltage	20V	35V	35V	35V	35V — Higher max input voltage provides more design margin.; MC7805CDTRKG: Higher max input voltage provides more design margin.; NCV7805BDTRKG: Higher max input voltage provides more design margin.
Current	1.0A	1.0A	-	-	1.0A — Output current is identical.
Dropout Voltage	1.2V @ 800mA (LDO)	Higher (Std. Regulator)	Higher (~2V)	Higher (~2V)	Higher (Std. Regulator) / Higher (~2V) — This is a standard regulator, not an LDO. Dropout is higher.; MC7805CDTRKG: MC7805 is a standard regulator, not an LDO. Dropout is significantly higher.; NCV7805BDTRKG: NCV7805 is a standard regulator, not an LDO. Dropout is significantly higher.
Application	Commercial	-	-	Automotive (AEC-Q100)	Automotive (AEC-Q100) — Candidate is automotive grade, may be over-spec for commercial use.

Application & sourcing insights

Questions & answers

The best alternatives are other 1117-family LDOs in a DPAK package. If not available, parts like LR7805D are functional alternatives in the same package, but require careful review of the dropout voltage.