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Best Alternatives to AMS1117-3.3S

Package: SOT-89EVVOVoltage Regulators - LinearOutput Voltage: 3.300 V typicalOutput Voltage Accuracy: 3.234 V to 3.366 V at IOUT = 10 mA, VIN = 5 V, TJ = 25 °COutput Current: 1 ADropout Voltage: 1.20 V typical, 1.30 V maximum at IOUT = 1 AMaximum Input Voltage: 18 V

AMS1117-3.3S is a 3.3V 1A LDO in SOT-89. No reviewed candidate is confirmed as a drop-in replacement.

AI replacement insight

Electrical riskmedium

Some candidates lower Vin or temp.

Package riskhigh

Several are SOT-223, not SOT-89.

Firmware risklow

Analog regulator; no firmware.

Sourcing riskmedium

Lifecycle blank on some parts.

Can it be replaced directly?

Direct replacement for AMS1117-3.3S should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

First verify CJA1117B-3.3 or an exact SOT-89 LD1117-3.3 variant.

Main risk

Package and pinout are not fully verified.

Recommended alternatives

3
CJA1117B-3.3 package
CJA1117B-3.3

Jiangsu Changjiang Electronics Technology Co., Ltd (CJ)

Needs validationmedium risk

CJA1117B-3.3 is a close SOT-89 LDO candidate with lower input-voltage rating.

View details

Alternative comparison matrix

Feature / factorAMS1117-3.3SCJA1117B-3.3LD1117-3.3LDL1117S33RCompatibility / risk
PackageSOT-89SOT-89-3L--SOT-223 — board change
Pinout3-pin3-pin--3-pin — not verified
Voltage18V max15V max--18V max — same max
Current1A1A--1A — same rating
Temperature-40 to 125C-25 to 125C---40 to 125C — from evidence

Application & sourcing insights

Questions & answers

Verified drop-in options for AMS1117-3.3S are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.