Is there a pin-compatible replacement for LMR51420YDDCR?

No pin-compatible replacement has been identified. While some parts share the SOT-23-6 package, key electrical parameters and pin functions differ, requiring board layout changes.

What risks should I check before replacing LMR51420YDDCR?

Key risks include lower maximum input voltage, different switching frequency (requiring new inductor/capacitor values), and potentially a narrower operating temperature range. Always verify the pinout from the datasheets.

LMR51420YDDCR Alternatives, Datasheet & Cross Reference | Texas Instruments

LMR51420YDDCR from Texas Instruments is a versatile 36V, 2A synchronous buck converter in a compact SOT-23-6 package. Finding a direct drop-in replacement is challenging due to its high input voltage and specific switching frequency.

AI replacement insight

Electrical riskhigh

Lower max input voltage and different switching frequency require redesign.

Package risklow

SOT-23-6 is a common package, but pinout must be verified.

Can it be replaced directly?

No direct, pin-compatible replacement was found. Alternatives require careful review of input voltage, switching frequency, and pinout.

Best replacement path

For applications with input voltage below 16V, consider functional alternatives like EA8212LT6R, but this requires redesign of external components.

Main risk

The primary risk is mismatched input voltage range; most alternatives do not support the target's 36V maximum input.

Recommended alternatives

Functional alternative in SOT-23-6 package with same current rating, but lower input voltage range and different frequency.

View details

Alternative comparison matrix

Feature / factor	LMR51420YDDCR	EA8212LT6R	Compatibility / risk
Topology	Buck	Buck	Buck — Both are synchronous buck converters.
Input Voltage	4.5V to 36V	4.5V to 16V	4.5V to 16V — Candidate has a much lower maximum input voltage.
Output Current	2A	2A	2A — matched
Switching Frequency	1.1 MHz	600 KHz	600 KHz — Requires recalculation of external components (inductor, capacitors).
Package	SOT-23-6	SOT-23-6	SOT-23-6 — Pinout requires verification.
Temperature	-40°C to 150°C	Unknown	Unknown — Target supports up to 150°C; candidate range is likely narrower.

Application & sourcing insights

Questions & answers

For applications with input voltage below 16V, EA8212LT6R is a potential functional alternative, but it requires circuit redesign due to a different switching frequency. No direct drop-in replacement is readily available.