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Best Alternatives to LDL1117S33R

Package: TO-261-4, TO-261AASTMicroelectronicsVoltage Regulators - LinearPackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Output Type: FixedVoltage - Input (Max): 18VVoltage - Output (Min/Fixed): 3.3VVoltage Dropout (Max): 0.6V @ 1.2A

The STMicroelectronics LDL1117S33R is a high-performance 3.3V, 1.2A LDO in a SOT223 package, known for its very low dropout voltage. Finding a substitute requires careful review of dropout voltage and output current.

AI replacement insight

Electrical riskhigh

Most alternatives have much higher dropout voltage and some have lower current ratings.

Package riskmedium

While packages may be labeled SOT223, pinout and thermal pad differences must be verified.

Sourcing risklow

Many 1117-type regulators are available, but finding one matching the target's performance is difficult.

Can it be replaced directly?

Direct replacement for LDL1117S33R should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

For applications sensitive to dropout voltage, no direct drop-in replacement is identified. For less demanding applications, BL8072CLTR33 offers higher current but with a significantly higher dropout voltage.

Main risk

The primary risk is the significantly higher dropout voltage of most alternatives, which can cause regulation failure if the input voltage is close to 3.3V.

Recommended alternatives

3
BL8072CLTR33 package
BL8072CLTR33

Shanghai Belling

Needs validationmedium risk

Functional alternative with higher 2A output current but significantly higher dropout voltage; requires engineering review.

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Alternative comparison matrix

Feature / factorLDL1117S33RBL8072CLTR33LD1117-3.3CJT1117B-3.3Compatibility / risk
Voltage3.3V18V--3.3V — Fixed output voltage matches.
Current1.2A2.0A--1.0A — Lower output current capability.
PackageSOT223SOT-223--SOT-223 — Available in SOT-223, but pinout must be verified.

Application & sourcing insights

Questions & answers

Verified drop-in options for LDL1117S33R 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.