Is there a pin-compatible replacement for TPS54821RHLR?

Currently, no pin-compatible replacement has been identified. All reviewed alternatives require a PCB layout change due to different packages or pin functions.

What risks should I check before replacing TPS54821RHLR?

Key risks include: 1) Output current capability must be ≥8A for the application. 2) The input voltage range must match your system's supply. 3) The new part's package and pinout will require a board redesign. 4) Thermal performance and control loop stability with new external components must be verified.

TPS54821RHLR Alternatives, Datasheet & Cross Reference | Texas Instruments

The TPS54821RHLR is a high-current (8A) synchronous buck converter. Finding a direct replacement is challenging due to its specific combination of voltage, current, and package, and typically requires a board redesign.

AI replacement insight

Electrical riskhigh

Most alternatives have much lower current ratings.

Package riskhigh

No package-compatible parts were found, requiring a PCB redesign.

Sourcing riskmedium

High-current DC-DC converters can have specific sourcing challenges.

Can it be replaced directly?

No, a direct pin-to-pin replacement for the TPS54821RHLR was not found. All potential alternatives require significant engineering review and a board redesign.

Best replacement path

Search for 8A+ buck converters in similar QFN packages, then verify pinout, thermal performance, and control loop components. A board redesign is expected.

Main risk

The primary risk is selecting a part with insufficient output current (less than 8A), which can cause voltage drops, overheating, or system failure under load.

Recommended alternatives

A functional alternative buck converter, but with significantly lower current (2A) and a different package, requiring redesign.

View details

Alternative comparison matrix

Feature / factor	TPS54821RHLR	RT8292BHZSP	Compatibility / risk
Topology	Buck (Step-Down)	Buck (Step-Down)	Buck (Step-Down) — Functionally similar.
Voltage	4.5 V to 17 V	4.5 V to 23 V	4.5 V to 23 V — Wider input range is acceptable.
Current	8 A	2 A	2 A — Massive downgrade, likely unsuitable for target application.
Package	14-Pin QFN	SOP-8-EP	SOP-8-EP — Not a form-fit replacement, requires redesign.
Temperature	-40 °C to 125 °C	-40°C to 125°C	-40°C to 125°C — Operating temperature range matches.

Application & sourcing insights

Questions & answers

No direct drop-in alternative was found. The best approach is to identify buck converters that meet the 8A current and 4.5V-17V input voltage requirements, then adapt the PCB layout for the new part's package and pinout.