Is there a pin-compatible replacement for LM2576S-3.3(UMW)?

No replacement can be guaranteed as pin-compatible without datasheet verification. However, the LM2576S-3.3 from manufacturer TWGMC is the most likely candidate for pin-compatibility, as it shares the same core part number, voltage, and switching frequency. You must check the datasheets to confirm the pinout and package dimensions.

What risks should I check before replacing LM2576S-3.3(UMW)?

The main risk is the switching frequency. The target operates at 52 kHz. Many alternatives (like the LM2596 series) operate at 150 kHz and will require you to change the external inductor and capacitors. Also, always verify the package dimensions and pinout, even for parts with similar names from different manufacturers.

LM2576S-3.3(UMW) Alternatives, Datasheet & Cross Reference | UMW

The LM2576S-3.3(UMW) is a 3.3V, 3A step-down regulator with a 52 kHz switching frequency. Finding a replacement requires careful attention to this frequency, as many similar parts operate at 150 kHz and would necessitate a circuit redesign.

AI replacement insight

Electrical riskhigh

Using a part with a different switching frequency (e.g., 150kHz vs 52kHz) without changing external components will lead to incorrect performance or failure.

Package riskmedium

Slight variations in package names (TO-263 vs TO-263-5) require verification of mechanical fit and pinout to avoid assembly issues.

Sourcing risklow

The LM2576/LM2596 families are widely produced by multiple vendors, offering good sourcing flexibility.

Can it be replaced directly?

No confirmed direct drop-in replacement has been identified. The LM2576S-3.3 from TWGMC is the most likely candidate but requires pinout and package verification before use.

Best replacement path

The most promising path is verifying the pinout and package of LM2576S-3.3 from TWGMC, as its electrical parameters are a strong match. If a redesign is acceptable, LM2596HVS-3.3(UMW) offers an input voltage upgrade.

Main risk

The primary risk is mismatch in switching frequency. Many alternatives use 150 kHz instead of 52 kHz, which requires a circuit redesign.

Recommended alternatives

A strong parametric alternative from TWGMC with matching frequency and higher current, requiring package verification.

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Alternative comparison matrix

Feature / factor	LM2576S-3.3(UMW)	LM2576S-3.3	LM2596HVS-3.3(UMW)	LM2596S-3.3(UMW)	Compatibility / risk
Voltage	3.3V	3.3V	4.75V - 60V	4.75V - 40V	3.3V / 4.75V - 60V / 4.75V - 40V — Output voltage matches.; LM2596HVS-3.3(UMW): Offers a higher maximum input voltage.; LM2596S-3.3(UMW): Input voltage range is nearly identical.
Current	3A	3.5A	-	-	3.5A — Higher output current capability.
Switching Frequency	52 kHz	52 kHz	150 kHz	150 kHz	52 kHz / 150 kHz — Switching frequency matches, external components may be compatible.; LM2596HVS-3.3(UMW): Higher frequency requires redesign of external inductor and capacitors.; LM2596S-3.3(UMW): Higher frequency requires redesign of external inductor and capacitors.
Package	TO-263	TO-263-5	TO-263	TO-263	TO-263-5 — Package is likely compatible but requires verification.; LM2596HVS-3.3(UMW): Package and pin count match.; LM2596S-3.3(UMW): Package and pin count match.

Application & sourcing insights

Questions & answers

The best alternative depends on your design constraints. For a near drop-in, LM2576S-3.3 from another manufacturer like TWGMC is a strong candidate, provided you verify the pinout. If you can redesign the board, LM2596HVS-3.3(UMW) is an upgrade with a higher input voltage rating.