Is there a pin-compatible replacement for AMS1117-3.3(SOT-223)?

Yes, parts like 'SSP7903P33FR' are pin-compatible. Many other regulators in the '1117' family, such as 'NCP1117LPST33T3G', are also highly likely to be pin-compatible. However, you must always verify the pinout in the datasheet before soldering.

What risks should I check before replacing AMS1117-3.3(SOT-223)?

Before replacing, check three key things: 1) Pinout: Ensure GND, VOUT, and VIN pins are in the same positions. 2) Input Voltage: The replacement must handle your circuit's maximum input voltage. 3) Dynamic Characteristics: Parameters like dropout voltage and quiescent current can affect system stability and power consumption.

AMS1117-3.3(SOT-223) Alternatives, Datasheet & Cross Reference | HXY MOSFET

The AMS1117-3.3 is a popular 3.3V, 1A Low-Dropout (LDO) regulator in a SOT-223 package. Numerous cross-vendor alternatives and modern, higher-performance upgrades are available for this widely-used component.

AI replacement insight

Electrical risklow

Most 1117-family parts have similar electrical specs. Upgrades may have different dynamic response.

Package riskmedium

Pinout must be verified. While SOT-223 is standard, pin functions can vary between unrelated parts.

Sourcing risklow

This is a very common part, with many alternatives available from multiple vendors.

Can it be replaced directly?

Yes, there are many direct replacements for the AMS1117-3.3 in a SOT-223 package, as it is a popular, multi-sourced component.

Best replacement path

For a direct cross, use another AMS1117-3.3 from a reputable vendor like Advanced Monolithic Systems. For an upgrade, SSP7903P33FR offers superior performance.

Main risk

The primary risk is pinout incompatibility, even with matching packages. Always verify the pinout (GND, VOUT, VIN) against the datasheet.

Recommended alternatives

Cross-vendor family alternative from the original designer with a wider operating temperature and input voltage range.

View details

Alternative comparison matrix

Feature / factor	AMS1117-3.3(SOT-223)	AMS1117-3.3	SSP7903P33FR	NCP1117LPST33T3G	Compatibility / risk
Package	SOT-223	SOT-223	SOT223	SOT-223	SOT-223 / SOT223 — Package matches.; SSP7903P33FR: Package matches.; NCP1117LPST33T3G: Package matches.
Voltage	12V	18V	40V	18V	18V / 40V — Higher max input voltage provides more design margin.; SSP7903P33FR: Significantly higher max input voltage (40V vs 12V).; NCP1117LPST33T3G: Higher max input voltage provides more design margin.
Temperature	0°C to 125°C	-40°C to 125°C	-40°C to 125°C	0°C to 125°C	-40°C to 125°C — Wider operating temperature range.; SSP7903P33FR: Wider operating temperature range.; NCP1117LPST33T3G: Operating temperature range matches.
Pinout	Standard 1117	Likely identical	-	Likely identical	Likely identical — Belongs to the same part family, but pinout must be verified from datasheet.; NCP1117LPST33T3G: Belongs to the 1117 family, but pinout must be verified from datasheet.
Dropout	~1.2V @ 1A	-	~0.4V @ 1A	-	~0.4V @ 1A — Much lower dropout voltage improves efficiency.
Quiescent Current	~5mA	-	1.6µA	-	1.6µA — Extremely low quiescent current, ideal for battery-powered devices.

Application & sourcing insights

Questions & answers

The best alternative depends on your needs. For a direct cross, 'AMS1117-3.3' from a major vendor is a safe choice. For a performance upgrade, 'SSP7903P33FR' offers a wider input voltage range and better efficiency.