NCP1117ST33T3G
onsemi
Needs validationlow risk
A strong alternative from onsemi in the same package with matching key electrical parameters.
Best Alternatives to A1117-3.3
The IDCHIP A1117-3.3 is a standard 1A, 3.3V LDO voltage regulator in a SOT-223 package. Numerous pin-compatible and functional alternatives are available from multiple manufacturers, making replacement straightforward with careful datasheet review.
AI replacement insight
Package riskmedium
While SOT-223 is standard, pin functions must be verified. A 4-pin variant vs 3-pin is a drop-in failure.
Electrical risklow
Most 1117-family parts have similar specs, but check dropout and input voltage range for your application.
Sourcing risklow
The 1117 family is widely available from many vendors, reducing sourcing risk.
Can it be replaced directly?
Direct replacement for A1117-3.3 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Use another 1117-family part like NCP1117ST33T3G or CJT1117B-3.3, which offer very similar performance. For an upgrade, consider BL8072CLTR33 for higher current and better efficiency.
Main risk
The main risk is pinout incompatibility, even within the same SOT-223 package. Minor differences in dropout voltage or minimum input voltage can also affect specific circuit performance.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | A1117-3.3 | NCP1117ST33T3G | BL8072CLTR33 | CJT1117B-3.3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-223 | SOT-223 | - | - | SOT-223 — Package matches target. |
| Voltage | 3.3V | 1.3V max @ 1A | - | - | 3.3V — Output voltage matches. |
| Current | 1.0A | 1.0A | - | - | 1.0A — Output current matches. |
Application & sourcing insights
Questions & answers
Verified drop-in options for A1117-3.3 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.