Is there a pin-compatible replacement for FNR8040S680MT?

YNR8040-101M is pin-compatible in its 8040 package, but it is not electrically equivalent. It has significantly lower current ratings (1.0A Irms vs 1.4A) and should be used with caution after careful engineering review.

What risks should I check before replacing FNR8040S680MT?

Key risks include lower current ratings (Isat and Irms), which can lead to overheating or saturation, and different inductance values, which will alter circuit performance. Also check DC Resistance (DCR) for efficiency impacts and ensure the package is an exact physical match.

FNR8040S680MT Alternatives, Datasheet & Cross Reference | Shenzhen CJiang Technology Co., Ltd.

Find substitutes for the FNR8040S680MT, a 68µH shielded power inductor in an 8x8mm package. This analysis covers alternatives, highlighting differences in package, current ratings, and inductance to ensure proper selection.

AI replacement insight

Electrical riskhigh

Candidates have different inductance and/or lower current ratings.

Package riskmedium

One candidate has a matching package but is an electrical downgrade; another requires PCB redesign.

Sourcing risklow

The candidates are from active manufacturers.

Can it be replaced directly?

There are no direct, risk-free replacements for FNR8040S680MT among the candidates. All options involve significant trade-offs in electrical parameters or physical package.

Best replacement path

No direct replacement identified. The best path is to re-evaluate circuit requirements. If lower current is acceptable, YNR8040-101M is a form-fit option to review. Otherwise, a new part selection is needed.

Main risk

The primary risk is electrical stress. Several candidates have lower current ratings, which could lead to component failure or system malfunction under load.

Recommended alternatives

Package matches, but has significantly lower current ratings and different inductance, posing a high risk.

View details

Alternative comparison matrix

Feature / factor	FNR8040S680MT	YNR8040-101M	SL0650-470M	Compatibility / risk
Package	8040 (8.0mm x 8.0mm)	8040 (8.0mm x 8.0mm)	0650 (7.1mm x 6.6mm)	8040 (8.0mm x 8.0mm) / 0650 (7.1mm x 6.6mm) — Package is a direct physical match.; SL0650-470M: Not a drop-in replacement, requires PCB redesign.
Current	1.6A (Isat)	1.15A	2.0A	1.15A / 2.0A — Saturation current is 28% lower, posing a saturation risk.; SL0650-470M: Higher heat rating current provides more margin.
Inductance	68µH	100µH	47µH	100µH / 47µH — Inductance is 47% higher, will alter circuit behavior.; SL0650-470M: Inductance is ~31% lower, will alter circuit behavior.
Resistance	255mΩ Typ	290mΩ Typ	255mΩ Max	290mΩ Typ / 255mΩ Max — Higher DCR will reduce efficiency.; SL0650-470M: Candidate DCR is max-rated, target is typical.

Application & sourcing insights

Questions & answers

No direct drop-in replacement was found. YNR8040-101M has the same package but lower current ratings, posing a risk. Other candidates have different packages or inductance values, requiring design changes.