Is there a pin-compatible replacement for LM2576T-ADJ?

Finding a direct pin-compatible replacement for the obsolete LM2576T-ADJ is difficult. Many modern equivalents use different packages or have different electrical characteristics like switching frequency, requiring careful review.

What risks should I check before replacing LM2576T-ADJ?

Key risks include package mismatch (through-hole vs. surface-mount), different switching frequencies requiring new external components (inductor, capacitors), and variations in control loop stability. Always verify in-circuit.

LM2576T-ADJ Alternatives, Datasheet & Cross Reference | onsemi

The LM2576T-ADJ is an obsolete 3A step-down voltage regulator in a TO-220 package. Finding a replacement requires careful consideration of functional alternatives, as most modern parts require a PCB redesign due to package and electrical differences.

AI replacement insight

Package riskhigh

Target is through-hole; most modern replacements are surface-mount, requiring a new PCB layout.

Electrical riskmedium

Switching frequency differences require recalculating external inductor and capacitor values.

Sourcing risklow

Many functional alternatives from various manufacturers are widely available.

Can it be replaced directly?

No direct, drop-in replacement is readily available. All viable alternatives require some level of design modification.

Best replacement path

Migrate to a modern surface-mount equivalent like the LM2596S series, which requires a PCB redesign.

Main risk

The primary risk is the need for a complete PCB layout and external component value change due to differences in package and switching frequency.

Recommended alternatives

A functional alternative with matched current, but requires redesign for its SMD package and different switching frequency.

View details

Alternative comparison matrix

Feature / factor	LM2576T-ADJ	LM2596S-ADJ	LM2596S-ADJRG	Compatibility / risk
Package	TO-220-5 (THD)	TO-263-5 (SMD)	TO-263-5 (SMD)	TO-263-5 (SMD) — Requires PCB redesign.; LM2596S-ADJRG: Requires PCB redesign.
Switching Frequency	52kHz	150kHz	150kHz	150kHz — Requires recalculation of external components.; LM2596S-ADJRG: Requires recalculation of external components.
Current	3.0A	3.0A	3.0A	3.0A — Output current matches.; LM2596S-ADJRG: Output current matches.
Voltage	Adjustable	Adjustable	4.5V - 40V	Adjustable / 4.5V - 40V — Output voltage type matches.; LM2596S-ADJRG: Wider input voltage range.

Application & sourcing insights

Questions & answers

The best alternative depends on whether a board redesign is possible. The LM2596S series offers similar electrical function in a surface-mount package, but requires a new layout and different external components.