Is there a pin-compatible replacement for FNR8040S100MT?

YNR8040-100M and YNR8040-6R8M share the same 8.0x8.0mm package and 2-pin layout, making them likely pin-compatible. However, their electrical parameters differ, so they are not drop-in replacements without review.

What risks should I check before replacing FNR8040S100MT?

Key risks include: 1) Electrical stress from lower current ratings (e.g., YNR8040-100M). 2) Changes in circuit behavior (ripple, efficiency) from different inductance (e.g., YNR8040-6R8M). Always verify in-circuit.

FNR8040S100MT Alternatives, Datasheet & Cross Reference | Shenzhen CJiang Technology Co., Ltd.

FNR8040S100MT is a 10µH, 3.6A shielded power inductor in a standard 8.0x8.0mm package, used in DC-DC converters. Finding a replacement requires matching inductance, current ratings, and package size.

AI replacement insight

Electrical riskmedium

Candidates have different current or inductance values requiring circuit validation.

Package risklow

Form-fit candidates in the same 8040 package are available.

Sourcing riskmedium

Lifecycle and regional availability of candidates have not been verified.

Can it be replaced directly?

No direct drop-in replacement has been identified. YNR8040-100M is a close parametric match but has lower current ratings, requiring careful review.

Best replacement path

Consider YNR8040-100M if a slight reduction in current handling is acceptable, or YNR8040-6R8M if the circuit can be adapted for a lower 6.8µH inductance.

Main risk

The primary risks are electrical: either accepting lower current ratings or redesigning for a different inductance value.

Recommended alternatives

A form-fit alternative with matching inductance but lower current ratings; requires engineering review.

View details

Alternative comparison matrix

Feature / factor	FNR8040S100MT	YNR8040-100M	YNR8040-6R8M	Compatibility / risk
Package	8040 (8.0mm x 8.0mm)	8040 (8.0mm x 8.0mm)	8040 (8.0mm x 8.0mm)	8040 (8.0mm x 8.0mm) — Form-factor match.; YNR8040-6R8M: Form-factor match.
Inductance	10µH	10µH	6.8µH	10µH / 6.8µH — Inductance matches.; YNR8040-6R8M: Lower inductance will alter circuit behavior.
Current	4.1A	3.6A	4.55A	3.6A / 4.55A — Lower saturation current.; YNR8040-6R8M: Higher saturation current provides more headroom.
Dcr	38mΩ (Typ)	29mΩ (Typ)	24mΩ (Typ)	29mΩ (Typ) / 24mΩ (Typ) — Lower DCR improves efficiency.; YNR8040-6R8M: Lower DCR improves efficiency.

Application & sourcing insights

Questions & answers

YNR8040-100M is a strong candidate if your design can tolerate a rated current of 3.3A (vs 3.6A). It matches the 10µH inductance and 8040 package.