Is there a pin-compatible replacement for SMMS1040-4R7M?

No direct drop-in, pin-compatible replacement has been confirmed. While candidates have 2 pins, their package sizes differ, requiring verification of the PCB layout and mechanical clearance before use.

What risks should I check before replacing SMMS1040-4R7M?

The main risk is mechanical fit. Check the package dimensions (length, width, and especially height) of any alternative. Also, verify that the higher current ratings and lower DCR of substitutes are compatible with your circuit's behavior.

SMMS1040-4R7M Alternatives, Datasheet & Cross Reference | SXN

Finding a substitute for the SMMS1040-4R7M 4.7µH power inductor involves balancing electrical upgrades with mechanical fit. While several alternatives offer higher current ratings, they often come in different package sizes requiring careful review.

AI replacement insight

Package riskhigh

All candidates have different dimensions, requiring layout or clearance checks.

Electrical risklow

Most candidates are electrical upgrades with higher current ratings.

Can it be replaced directly?

No direct pin-for-pin, drop-in replacement has been identified. All suitable alternatives require verification of mechanical fit, especially package size and height.

Best replacement path

MDA1050-4R7M is the closest candidate if a 1mm height increase is acceptable. Otherwise, a board redesign is needed for other electrically superior but larger parts.

Main risk

The primary risk is mechanical incompatibility. All potential upgrades have different package dimensions than the original SMMS1040-4R7M.

Recommended alternatives

A functional alternative with higher current ratings, but verify mechanical clearance due to increased height.

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Alternative comparison matrix

Feature / factor	SMMS1040-4R7M	MDA1050-4R7M	CYA1265-4.7UH	SMMS1360-4R7M	Compatibility / risk
Inductance	4.7µH	4.7µH	4.7µH	4.7µH	4.7µH — Inductance matches target.; CYA1265-4.7UH: Inductance matches target.; SMMS1360-4R7M: Inductance matches target.
Saturation Current A	15A	16A	36A	18A	16A / 36A / 18A — Higher saturation current provides more margin.; CYA1265-4.7UH: Significantly higher saturation current.; SMMS1360-4R7M: Higher saturation current.
Dcr Ohm	17mΩ	9.3mΩ	7.5mΩ	6.8mΩ	9.3mΩ / 7.5mΩ / 6.8mΩ — Lower DCR improves efficiency.; CYA1265-4.7UH: Lower DCR improves efficiency.; SMMS1360-4R7M: Lower DCR improves efficiency.
Package	11.5x10.0x4.0mm	11.2x10.3x5.0mm	13.0x12.8x6.5mm	13.0x12.8x6.0mm	11.2x10.3x5.0mm / 13.0x12.8x6.5mm / 13.0x12.8x6.0mm — Footprint is similar, but part is 1mm taller.; CYA1265-4.7UH: Significantly larger package requires board redesign.; SMMS1360-4R7M: Significantly larger package requires board redesign.

Application & sourcing insights

Questions & answers

MDA1050-4R7M is a strong electrical upgrade with a similar footprint, but is 1mm taller. If height is not a constraint, it's a good option. Otherwise, parts like SMMS1360-4R7M offer upgrades but need a larger PCB space.