Is there a pin-compatible replacement for TPS54340DDAR?

Yes, parts like LMR16030PDDAR, LMR14050SQDDARQ1, and LMR14020SDDAR use the same HSOIC-8 package and have a compatible pinout. However, they are not drop-in replacements due to differing electrical characteristics like current and voltage ratings, which must be verified.

What risks should I check before replacing TPS54340DDAR?

Before replacing TPS54340DDAR, you must check for differences in: 1) Output current rating, 2) Maximum input voltage, 3) Maximum operating temperature, and 4) Dynamic features like the target's Eco-mode, which affects light-load efficiency. Always review the datasheets carefully.

TPS54340DDAR Alternatives, Datasheet & Cross Reference | Texas Instruments

Find the best alternatives for the TPS54340DDAR, a 42V, 3.5A step-down converter. This guide compares pin-compatible and functional replacements, detailing key differences in current, voltage, and features to ensure a successful substitution.

AI replacement insight

Electrical riskmedium

Candidates have different current, voltage, and temperature ratings that must be validated against the application's needs.

Package risklow

Several candidates share the same HSOIC-8 package and pinout, simplifying PCB layout compatibility.

Sourcing risklow

All suggested alternatives are from the same manufacturer (Texas Instruments) and are actively produced.

Can it be replaced directly?

No perfect drop-in replacement exists. While several parts are pin-compatible, all have different electrical specifications that require careful review before substitution.

Best replacement path

LMR16030PDDAR offers a higher voltage range but slightly less current, making it a robust choice if the full 3.5A rating is not strictly needed.

Main risk

The primary risk is a mismatch in output current capability or maximum operating ratings (voltage, temperature), which could lead to circuit malfunction or failure.

Recommended alternatives

Pin-compatible alternative with higher input voltage but slightly lower output current.

View details

Alternative comparison matrix

Feature / factor	TPS54340DDAR	LMR16030PDDAR	LMR14050SQDDARQ1	LMR14020SDDAR	Compatibility / risk
Package	HSOIC-8	HSOIC (8)	HSOIC (8)	HSOIC-8	HSOIC (8) / HSOIC-8 — Package and pinout appear to match.; LMR14050SQDDARQ1: Package and pinout appear to match.; LMR14020SDDAR: Package and pinout appear to match.
Current	3.5 A	3.0 A	5.0 A	2.0 A	3.0 A / 5.0 A / 2.0 A — Slightly lower output current.; LMR14050SQDDARQ1: Higher output current capability.; LMR14020SDDAR: Significantly lower output current.
Voltage	4.5V - 42V	4.3V - 60V	4V - 40V	4V - 40V	4.3V - 60V / 4V - 40V — Wider input voltage range with higher max.; LMR14050SQDDARQ1: Max input voltage is lower.; LMR14020SDDAR: Max input voltage is lower.
Temperature	-40°C to 150°C	unknown	-40°C to 125°C	-	unknown / -40°C to 125°C — Full temp range not in summary, datasheet check needed.; LMR14050SQDDARQ1: Lower max operating temperature.
Frequency	up to 2.5MHz	-	-	200kHz - 2.5MHz	200kHz - 2.5MHz — Similar adjustable frequency range.

Application & sourcing insights

Questions & answers

The best alternative depends on your specific needs. LMR16030PDDAR is a strong choice for its higher 60V input voltage if your design can tolerate a slightly lower 3A output current. If you need more current, LMR14050SQDDARQ1 offers 5A but has a lower voltage rating.