Is there a pin-compatible replacement for SCJT1117B-3.3-A?

Several parts like NCP1117LPST33T3G and others in the AMS1117 family are available in the same SOT-223 package. They are likely pin-compatible, but it is critical to verify the pinout (GND, Vout, Vin) from the manufacturer's datasheet before soldering.

What risks should I check before replacing SCJT1117B-3.3-A?

The main risks are electrical and thermal. Check that the replacement's maximum input voltage is at least 15V. Also, ensure its operating temperature range covers your system's requirements, as some alternatives have a narrower range.

SCJT1117B-3.3-A Alternatives, Datasheet & Cross Reference | Jiangsu Changjing Electronics Technology Co., Ltd.

SCJT1117B-3.3-A is a 3.3V, 1A low-dropout (LDO) linear regulator in a SOT-223 package. This page provides an engineering review of potential alternatives, focusing on critical electrical and mechanical parameters for a safe replacement.

AI replacement insight

Electrical riskmedium

Candidates have varying max input voltages and temperature ranges.

Package risklow

Most candidates use the same SOT-223 package, but pinout must be verified.

Sourcing risklow

The 1117-3.3 regulator is a widely available component from many vendors.

Can it be replaced directly?

While several parts share the SOT-223 package and key ratings, no drop-in replacement is confirmed without datasheet verification of the pinout and operating temperature range. The AMS1117 family is typically pin-compatible.

Best replacement path

NCP1117LPST33T3G from onsemi is a strong candidate, offering higher input voltage tolerance, but its minimum operating temperature is 0°C, which should be verified against the application's requirements.

Main risk

The primary risk when substituting is a mismatch in maximum input voltage or operating temperature range, which could lead to device failure under stress.

Recommended alternatives

A parametric alternative in a SOT-223 package, but with a lower maximum input voltage and narrower temperature range.

View details

Alternative comparison matrix

Feature / factor	SCJT1117B-3.3-A	AMS1117-3.3(SOT-223)	NCP1117LPST33T3G	SSP7903P33FR	Compatibility / risk
Package	SOT-223	SOT-223	SOT-223	SOT223	SOT-223 / SOT223 — Package matches target.; NCP1117LPST33T3G: Package matches target.; SSP7903P33FR: Package matches target.
Voltage	15V	12V	18V	40V	12V / 18V / 40V — Lower max input voltage. Not suitable for applications above 12V.; NCP1117LPST33T3G: Higher max input voltage provides more design margin.; SSP7903P33FR: Significantly higher max input voltage offers a robust upgrade.
Temperature	-20°C to 125°C	0°C to 125°C	0°C to 125°C	-40°C to 85°C	0°C to 125°C / -40°C to 85°C — Narrower operating range, starts at 0°C instead of -20°C.; NCP1117LPST33T3G: Narrower operating range, starts at 0°C instead of -20°C.; SSP7903P33FR: Max operating temperature is lower (85°C vs 125°C).
Current	1.0A	1.0A	1.0A	-	1.0A — Output current matches.; NCP1117LPST33T3G: Output current matches.
Pinout	3	-	3	-	3 — Pin count matches, but pin functions require datasheet verification.
Quiescent Current	typ. 5mA	-	-	1.6µA	1.6µA — Much lower quiescent current, beneficial for battery-powered devices.

Application & sourcing insights

Questions & answers

The best alternative appears to be NCP1117LPST33T3G from onsemi, as it offers a higher max input voltage (18V). However, you must verify its operating temperature range (0°C to 125°C) is acceptable for your application.