AMS1117-3.3
HEERMICR
Needs validationmedium risk
AMS1117-3.3 is a common 3.3V 1A SOT-223 LDO candidate with input and temp caveats.
Best Alternatives to LM1117S-3.3
LM1117S-3.3 is a fixed 3.3V 1A SOT-223 LDO. Alternatives need pinout, input-voltage, thermal, and capacitor checks.
AI replacement insight
Electrical riskmedium
Vin max or temp may be lower.
Package riskmedium
SOT-223 matches, pinout does not.
Firmware risklow
Analog LDO; no firmware.
Sourcing riskmedium
External TI part not indexed.
Can it be replaced directly?
No verified pin-compatible replacement is proven from the supplied fields.
Best replacement path
Review AMS1117-3.3 first for same 3.3V 1A SOT-223 class; consider TLV76133DCYR as an external TI path.
Main risk
Pinout and input-voltage margin are not fully proven.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | LM1117S-3.3 | AMS1117-3.3 | LM39100S-3.3 | LD1117AG-33-AA3-A-R | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-223 | SOT-223 | SOT-223 | SOT-223 | SOT-223 — same package name; LM39100S-3.3: same package name; LD1117AG-33-AA3-A-R: same package name |
| Pinout | 3 pins, pinout missing | 3 pins; AMS pinout evidence | 4 pins | 4 pins | 3 pins; AMS pinout evidence / 4 pins — target pinout absent; LM39100S-3.3: pin count differs; LD1117AG-33-AA3-A-R: pin count differs |
| Voltage | 3.3V out, 20V max in | 3.3V out, 15-18V max in | 3.3V out, 16V max in | 3.3V out, 15V max in | 3.3V out, 15-18V max in / 3.3V out, 16V max in / 3.3V out, 15V max in — input rating lower; LM39100S-3.3: input rating lower; LD1117AG-33-AA3-A-R: input rating lower |
| Current | 1A | 1A | 1A | 1A | 1A — same output current; LM39100S-3.3: same output current; LD1117AG-33-AA3-A-R: same output current |
| Temperature | -40 to 125C | -20 to 85C or 0 to 150C | -40 to 125C | -20 to 125C | -20 to 85C or 0 to 150C / -40 to 125C / -20 to 125C — variant dependent; LM39100S-3.3: same range; LD1117AG-33-AA3-A-R: cold limit weaker |
Application & sourcing insights
Questions & answers
AMS1117-3.3 is the closest indexed 3.3V 1A SOT-223 candidate, but pinout, Vin, and temperature must be checked.