Is there a pin-compatible replacement for FNR4030S3R9MT?

Yes, parts in the same 4030 (4x4mm) package are pin-compatible. However, you must verify key electricals like inductance and current ratings. For example, YNR4030-2R2M is pin-compatible but has lower inductance.

What risks should I check before replacing FNR4030S3R9MT?

The main risks are inductance value, saturation current (Isat), and DC resistance (DCR). A different inductance will change circuit behavior. Lower Isat can cause saturation. Higher DCR increases power loss.

FNR4030S3R9MT Alternatives, Datasheet & Cross Reference | Shenzhen CJiang Technology Co., Ltd.

Finding a substitute for the FNR4030S3R9MT power inductor requires matching its 3.9µH inductance, 2.3A current rating, and 4030 package. While no direct drop-in is found, functional alternatives exist.

AI replacement insight

Electrical riskhigh

Inductance mismatch is the main risk and requires circuit re-evaluation.

Package risklow

Candidates with a matching 4030 package are available.

Can it be replaced directly?

No direct, one-to-one replacement has been identified. All candidates require engineering review due to different inductance values.

Best replacement path

Find a 4030 package inductor with inductance near 3.9µH and current ratings (Irms/Isat) ≥ 2.3A/3.3A.

Main risk

The primary risk is changing the inductance value, which can affect the performance and stability of a power converter circuit.

Recommended alternatives

Same package and higher current ratings, but lower inductance requires engineering review.

View details

Alternative comparison matrix

Feature / factor	FNR4030S3R9MT	YNR4030-2R2M	YNR4030-R68N	Compatibility / risk
Package	4030 (4.0mm x 4.0mm)	4030 (4.0mm x 4.0mm)	4030 (4.0mm x 4.0mm)	4030 (4.0mm x 4.0mm) — Package size matches.; YNR4030-R68N: Package size matches.
Inductance	3.9µH	2.2µH	0.68µH	2.2µH / 0.68µH — Lower inductance requires circuit validation.; YNR4030-R68N: Significantly lower inductance requires circuit validation.
Current	2.3A	2.95A	6.8A	2.95A / 6.8A — Higher rated current (Irms).; YNR4030-R68N: Higher saturation current (Isat).
Resistance	74mΩ	39mΩ max	13mΩ max	39mΩ max / 13mΩ max — Lower DC Resistance (DCR) is beneficial.; YNR4030-R68N: Much lower DC Resistance (DCR).
Tolerance	±20%	-	±30%	±30% — Wider tolerance.

Application & sourcing insights

Questions & answers

There is no direct drop-in replacement found. Alternatives like YNR4030-2R2M offer a matching package and higher current ratings but have a different inductance (2.2µH) that requires circuit validation.