NCP1117ST33T3G
onsemi
Needs validationlow risk
Strong cross-vendor alternative from onsemi with a higher input voltage rating (20V) in a matching SOT-223 package.
Best Alternatives to LD1117-3.3
The LD1117-3.3 is a common 3.3V, 1A LDO regulator available in multiple packages. Several functional alternatives exist, but require careful verification of package, pinout, and key electrical parameters like input voltage and temperature range.
AI replacement insight
Package riskhigh
Multiple packages for target and candidates require pinout verification to avoid incorrect connections.
Electrical riskmedium
Some alternatives have lower voltage or temperature ratings that must be checked against application requirements.
Sourcing risklow
The 1117-series is widely available from multiple vendors, offering good sourcing flexibility.
Can it be replaced directly?
No drop-in replacement is guaranteed without datasheet verification. NCP1117ST33T3G is a strong candidate for a functional replacement in the SOT-223 package, pending pinout confirmation.
Best replacement path
NCP1117ST33T3G is a robust cross-vendor alternative. LDL1117S33R is an upgrade for higher current and lower dropout needs.
Main risk
The primary risk is pinout incompatibility even within the same package type (e.g., SOT-223), followed by reduced input voltage or temperature ratings in some alternatives.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | LD1117-3.3 | NCP1117ST33T3G | LDL1117S33R | BL8072CLTR33 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-223, TO-252, SOT-89 | SOT-223 | - | - | SOT-223 — Matches one of target's packages. Pinout must be verified. |
| Voltage | 18 V | 20 V | - | - | 15 V — Lower maximum input voltage. |
| Current | 1.0 A | 1.0 A | - | - | 2.0 A — Higher output current capability. |
| Dropout Voltage | 1.2 V @ 1 A | - | 0.35 V @ 1.2 A | - | 0.35 V @ 1.2 A — Significantly lower dropout voltage improves efficiency. |
| Temperature | -40 °C to 125 °C | - | - | -40°C to 85°C | -40°C to 85°C — Lower maximum operating temperature. |
Application & sourcing insights
Questions & answers
The NCP1117ST33T3G from onsemi is a strong alternative, offering similar or better performance. For higher current needs, the LDL1117S33R from STMicroelectronics provides 1.2A. Always verify the datasheet for your specific application.