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Best Alternatives to LD1117-1.2

Package: TO-261-4, TO-261AAUMWVoltage Regulators - LinearSeries: -Package: Tape & Reel (TR) Cut Tape (CT) Digi-Reel®Voltage - Input (Max): 12VVoltage - Output (Min/Fixed): 1.2VVoltage - Output (Max): -

The UMW LD1117-1.2 is a 1.2V, 1A low-dropout (LDO) linear regulator in a SOT-223 package. Strong alternatives like the AMS1117-1.2 exist, but require careful verification of pinout and datasheet parameters before substitution.

AI replacement insight

Package riskmedium

Pinout for SOT-223 regulators can vary between manufacturers. Verification is mandatory.

Electrical risklow

Key parameters match, but secondary characteristics like dropout and PSRR should be reviewed for sensitive applications.

Firmware riskhigh

Using an adjustable alternative like AMS1117-ADJ requires circuit redesign, not just a simple swap.

Can it be replaced directly?

Direct replacement for LD1117-1.2 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The best replacement path is to use another fixed 1.2V regulator from the 1117 family, such as the AMS1117-1.2, after verifying its pinout.

Main risk

The primary risk is pinout incompatibility. While most SOT-223 versions of the 1117 family share a standard pinout, variations exist and must be checked.

Recommended alternatives

2
AMS1117-1.2 package
AMS1117-1.2

Advanced Monolithic Systems

Needs validationlow risk

A strong alternative with matching key electrical parameters and package. Pinout verification is required.

View details

Alternative comparison matrix

Feature / factorLD1117-1.2AMS1117-1.2AMS1117-ADJAlt 3Compatibility / risk
Output Voltage V1.2V1.2V1.25V (ref)1.2V / 1.25V (ref) — Output voltage matches target.; AMS1117-ADJ: Adjustable part, can be set to 1.2V with external resistors.
Output Current A1.0A1.0A1.0A1.0A — Output current matches target.; AMS1117-ADJ: Output current matches.
PackageSOT-223SOT-223SOT-223SOT-223 — Package matches, enabling form-fit compatibility.; AMS1117-ADJ: Package matches, enabling form-fit compatibility.
Pin Count33-3 — Pin count matches.
TopologyFixedFixedAdjustableFixed / Adjustable — Topology matches target.; AMS1117-ADJ: Candidate is adjustable, target is fixed. Requires external resistors.

Application & sourcing insights

Questions & answers

Verified drop-in options for LD1117-1.2 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.