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Best Alternatives to NCP1117ST33T3G

Package: TO-261-4, TO-261AAonsemiVoltage Regulators - LinearPackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Output Type: FixedNumber of Regulators: 1Voltage - Input (Max): 20VVoltage - Output (Min/Fixed): 3.3V

NCP1117ST33T3G is a popular 3.3V, 1A LDO voltage regulator in a SOT-223 package from onsemi, notable for its 20V maximum input voltage. This page provides a detailed analysis of potential alternatives, focusing on critical parametric differences.

AI replacement insight

Electrical riskhigh

All candidates have a lower max input voltage. Applying >18V could damage the substitute.

Package risklow

All candidates use the same SOT-223 package, ensuring physical compatibility.

Sourcing risklow

Many alternatives, like the AMS1117 family, are widely multi-sourced.

Can it be replaced directly?

No direct drop-in replacement exists if the full 20V input range is required. All common alternatives have a lower maximum input voltage (typically 15V-18V), requiring design verification.

Best replacement path

If the system input is below 18V, LDL1117S33R is a strong upgrade. If below 15V, the common AMS1117-3.3 is a cost-effective functional alternative.

Main risk

Maximum input voltage is lower than the target.

Recommended alternatives

6
LDL1117S33R package
LDL1117S33R

STMicroelectronics

Needs validationmedium risk

A high-performance alternative with better current and dropout, but with a lower maximum input voltage of 18V.

View details

Alternative comparison matrix

Feature / factorNCP1117ST33T3GLDL1117S33RAMS1117-3.3A1117-3.3Compatibility / risk
PackageSOT-223SOT223--SOT-223 — Package matches.
Voltage20V18V--15V — Max input voltage is lower.
Current1.0A1.2A--1.0A — Output current matches.
Dropout1.2V @ 800mA350mV @ 1.2A--350mV @ 1.2A — Significantly lower dropout voltage.
Temperature0°C to 125°C-40°C to 125°C--Varies — Range varies by mfr, but often matches or exceeds target.

Application & sourcing insights

Questions & answers

The best alternative depends on the application's maximum input voltage. For high performance, STMicroelectronics' LDL1117S33R offers higher current and lower dropout, but with an 18V max input. For general use, the widely-sourced AMS1117-3.3 is a functional match, but its max input voltage is typically 15V-18V and must be verified.