Is there a pin-compatible replacement for SMNR4030-680MT?

No, a direct pin-compatible replacement for the SMNR4030-680MT was not found in this analysis. All functional alternatives identified have a different, larger package size, which would require changes to the PCB layout.

What risks should I check before replacing SMNR4030-680MT?

The main risk is the physical package mismatch. You must verify that the larger footprint of any alternative fits your PCB layout. Also, check for potential changes in EMI performance due to the different size and construction of the inductor.

SMNR4030-680MT Alternatives, Datasheet & Cross Reference | SXN

Finding a substitute for the SMNR4030-680MT inductor involves a trade-off between size and performance. While no direct drop-in replacements are available, several functional alternatives offer superior electrical characteristics in a larger package.

AI replacement insight

Package riskhigh

All candidates have a larger footprint, preventing direct replacement.

Electrical risklow

Candidates offer superior current handling and lower DCR, which is generally safe.

Can it be replaced directly?

No direct, pin-compatible replacements were identified. All electrically suitable alternatives have a larger package and require a board redesign.

Best replacement path

If PCB space allows, use a functional alternative like SMNR6045-680MT for better performance, but this requires a layout change.

Main risk

The primary risk is package mismatch. No candidates are drop-in replacements, so a PCB respin is necessary.

Recommended alternatives

Functional alternative with double the saturation current but a larger 0630 package.

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Alternative comparison matrix

Feature / factor	SMNR4030-680MT	SMMS0630-680MT	SMNR6045-680MT	SMMS0850-680M	Compatibility / risk
Package	4030 (4.0x4.0x3.0mm)	0630 (7.1x6.6x3.0mm)	6045 (6.0x6.0x4.5mm)	8.5x8.0x5.0mm	0630 (7.1x6.6x3.0mm) / 6045 (6.0x6.0x4.5mm) / 8.5x8.0x5.0mm — Larger package, not a drop-in.; SMNR6045-680MT: Not a drop-in replacement.; SMMS0850-680M: Significantly larger package.
Inductance H	68µH	68µH	68µH	68µH	68µH — matched; SMNR6045-680MT: matched; SMMS0850-680M: matched
Saturation Current A	0.72A	1.5A	1.2A	2.8A	1.5A / 1.2A / 2.8A — Over 2x higher Isat.; SMNR6045-680MT: Higher current handling.; SMMS0850-680M: Significantly higher current handling.
Dcr Ohm	0.868Ω	0.506Ω	0.286Ω	0.31Ω	0.506Ω / 0.286Ω / 0.31Ω — Lower DCR.; SMNR6045-680MT: Lower DCR improves efficiency.; SMMS0850-680M: Lower DCR.

Application & sourcing insights

Questions & answers

The best alternative depends on your space constraints. If you can accommodate a larger part, SMNR6045-680MT offers better current ratings in a 6x6mm package. For high-power needs, parts like FCH1365-680M are available but are much larger.