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Best Alternatives to FP6381AS5CTR

Package: SOT-23-5FITIPOWERPMIC - Voltage Regulators - DC DC Switching RegulatorsOutput Current: 1.2 AInput Voltage Range: 2.5 V to 6 VSwitching Frequency: 1.5 MHzOutput Voltage (Adjustable): 0.6 V to VINPackage Type: SOT-23-5

FP6381AS5CTR is a 1.5MHz, 1.2A synchronous step-down converter in a SOT-23-5 package. When seeking replacements, engineers must verify the switching frequency and pinout, as direct drop-in parts are uncommon.

AI replacement insight

Electrical riskhigh

Switching frequency mismatch requires redesign. Pinout must be verified.

Package risklow

All candidates share the common SOT-23-5 package.

Firmware risklow

Not a programmable part.

Can it be replaced directly?

No direct drop-in replacement has been identified. All candidates require circuit modifications due to different switching frequencies.

Best replacement path

Redesign with a functional alternative like ETA3496S2F, adjusting external components for the new switching frequency.

Main risk

Switching frequency differences require mandatory redesign of the output filter (inductor and capacitors).

Recommended alternatives

5
ETA3496S2F package
ETA3496S2F

ETA

Needs validationmedium risk

Strong functional alternative with matching current and wider input voltage, but different frequency (1.2MHz).

View details

Alternative comparison matrix

Feature / factorFP6381AS5CTRETA3496S2FSTI3411AETA3418S2FCompatibility / risk
PackageSOT-23-5SOT23-5SOT23-5SOT23-5SOT23-5 — Package matches.; STI3411A: Package matches.; ETA3418S2F: Package matches.; ETA3448S2F: Package matches.
Current1.2A1.2A2.0A2.5A1.2A / 2.0A / 2.5A / 3.0A — Output current matches.; STI3411A: Higher output current capability.; ETA3418S2F: Higher output current capability.; ETA3448S2F: Higher output current capability.
Frequency1.5MHz1.2MHz1.0MHz3.0MHz1.2MHz / 1.0MHz / 3.0MHz / 2.0MHz — Slightly different frequency may require external component changes.; STI3411A: Different frequency requires external component changes.; ETA3418S2F: Much higher frequency requires significant redesign.; ETA3448S2F: Different frequency requires external component changes.
Voltage2.5V to 6V2.2V to 7.2V2.5V to 6V2.6V to 7V2.2V to 7.2V / 2.5V to 6V / 2.6V to 7V / 2.5V to 5.5V — Wider input voltage range.; STI3411A: Input voltage range matches.; ETA3418S2F: Wider input voltage range, slightly higher min Vin.; ETA3448S2F: Lower maximum input voltage.
PinoutUnknownUnknownUnknownUnknownUnknown — Pinout must be verified from datasheet.; STI3411A: Pinout must be verified from datasheet.; ETA3418S2F: Pinout must be verified from datasheet.; ETA3448S2F: Pinout must be verified from datasheet.

Application & sourcing insights

Questions & answers

ETA3496S2F is a strong functional alternative, offering the same output current and a wider input voltage range. However, its 1.2MHz switching frequency requires recalculating external components.