Is there a pin-compatible replacement for SK1117-3.3?

Several parts like LM1117S-3.3(MS) and AMS1117-3.3S share the same SOT-223-4 package and likely pinout, but have parametric differences. Pin-for-pin compatibility should be confirmed by comparing datasheets.

What risks should I check before replacing SK1117-3.3?

Key risks include differences in output current capability, maximum operating temperature, and dropout voltage. Ensure the replacement can handle your system's load current and thermal environment.

SK1117-3.3 Alternatives, Datasheet & Cross Reference | SHIKUES

SK1117-3.3 is a 1A, 3.3V fixed low dropout (LDO) linear regulator in a SOT-223 package. Finding a substitute requires matching the output current, input voltage range, and pinout.

AI replacement insight

Electrical riskmedium

Candidates may have lower current or different temperature ratings.

Package risklow

SOT-223 is a common package, but pinout must be verified.

Sourcing risklow

The 1117-3.3 regulator family is widely available from multiple vendors.

Can it be replaced directly?

No direct drop-in replacement without caveats has been identified. Alternatives require reviewing either thermal or current-handling capabilities.

Best replacement path

Review parametric alternatives like LM1117S-3.3(MS), but verify thermal requirements carefully.

Main risk

The main risks are thermal performance and output current capability. Several candidates have lower temperature ratings or cannot supply the full 1A.

Recommended alternatives

A strong parametric match, but with a lower maximum operating temperature of 85°C that requires review.

View details

Alternative comparison matrix

Feature / factor	SK1117-3.3	LM1117S-3.3(MS)	AMS1117-3.3S	Compatibility / risk
Package	SOT-223	SOT-223	SOT-223	SOT-223 — Package matches.; AMS1117-3.3S: Package matches.
Pin Count	4	4	4	4 — Pin count matches.; AMS1117-3.3S: Pin count matches.
Current	1 A	1 A	800 mA	1 A / 800 mA — Output current matches.; AMS1117-3.3S: Candidate has lower output current.
Temperature	-40°C to 125°C	-40°C to 85°C	-40°C to 125°C	-40°C to 85°C / -40°C to 125°C — Candidate has a lower maximum operating temperature.; AMS1117-3.3S: Operating temperature range matches.
Dropout Voltage	1.1 V @ 1 A	1.3 V @ 1 A	-	1.3 V @ 1 A — Dropout voltage is slightly higher.
Voltage	3.3 V	-	3.3 V	3.3 V — Output voltage matches.

Application & sourcing insights

Questions & answers

LM1117S-3.3(MS) is a strong functional alternative, but has a lower max temperature of 85°C. For lower current needs (up to 800mA), AMS1117-3.3S is an option. Always verify parameters for your specific application.