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Best Alternatives to LMR51430YFDDCR

Package: SOT-23-6 Thin, TSOT-23-6Texas InstrumentsVoltage Regulators - DC DC Switching RegulatorsSeries: SIMPLE SWITCHER®Package: Tape & Reel (TR) Cut Tape (CT) Digi-Reel®Voltage - Input (Min): 4.5VVoltage - Input (Max): 36VVoltage - Output (Min/Fixed): 0.6V

LMR51430YFDDCR is a 36V, 3A synchronous buck converter from Texas Instruments in a SOT-23-6 package. It features a 1.1MHz switching frequency and FPWM mode for low-noise applications. Alternatives exist but require careful review.

AI replacement insight

Electrical riskmedium

Frequency/control mode changes affect performance and external components.

Package risklow

SOT-23-6 is standard; family variants match pinout.

Firmware risklow

Not applicable for this analog-controlled regulator.

Can it be replaced directly?

Direct replacement for LMR51430YFDDCR should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Use another variant from the TI LMR51430 family, such as LMR51430XFDDCR, after verifying the impact of the lower switching frequency.

Main risk

The main risk is functional difference in switching frequency and control mode, even within the same product family, requiring external component review.

Recommended alternatives

2
LMR51430XFDDCR package
LMR51430XFDDCR

Texas Instruments

Needs validationlow risk

Pin-compatible family variant with same ratings but lower 500kHz switching frequency.

View details

Alternative comparison matrix

Feature / factorLMR51430YFDDCRLMR51430XFDDCRLMR51430XDDCRAlt 3Compatibility / risk
Voltage4.5V to 36V4.5V to 36V4.5V to 36V4.5V to 36V — Input voltage range matches.; LMR51430XDDCR: Input voltage range matches.
Current3A3A3A3A — Output current matches.; LMR51430XDDCR: Output current matches.
Switching Frequency1.1MHz500kHz500kHz500kHz — Lower frequency requires external component review.; LMR51430XDDCR: Lower frequency requires external component review.
Control ModeFPWMFPWMPFM/Peak Current ModeFPWM / PFM/Peak Current Mode — Control mode matches.; LMR51430XDDCR: PFM mode differs from target's FPWM, affecting light-load efficiency and ripple.
PackageSOT-23-6SOT-23-6SOT-23-6SOT-23-6 — Same family, pinout is compatible.; LMR51430XDDCR: Same family, pinout is compatible.

Application & sourcing insights

Questions & answers

Verified drop-in options for LMR51430YFDDCR 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.