Is there a pin-compatible replacement for SMNR4020-10UH?

Yes, several inductors like Sunlord's WPN4020H100MT and KOHERELEC's MDA4020-100M use the same 2-pin 4020 package. As these are simple 2-pin devices, they are typically pin-compatible, but you must verify electrical parameters.

What risks should I check before replacing SMNR4020-10UH?

The main risks are electrical. Check the replacement's DC Resistance (DCR), as a higher value increases power loss. Also, confirm the saturation current (Isat) and thermal current (Irms) meet or exceed your application's needs.

SMNR4020-10UH Alternatives, Datasheet & Cross Reference | SXN

Finding a replacement for the SMNR4020-10UH 10µH inductor involves matching its 4020 package, inductance, and current ratings. Several functional alternatives exist with similar or improved performance, but careful review of DC Resistance (DCR) is essential.

AI replacement insight

Electrical riskmedium

DCR and current ratings must be carefully checked against application needs.

Package risklow

The 4020 package is standard and widely available.

Sourcing risklow

Multiple vendors produce similar parts, improving availability.

Can it be replaced directly?

No officially documented direct replacement exists. However, several parts are form, fit, and functionally similar, such as WPN4020H100MT, which should be evaluated for your specific circuit.

Best replacement path

The most promising path is selecting an alternative like Sunlord's WPN4020H100MT, which offers upgraded current handling in the same package, providing a performance margin.

Main risk

The primary risk is increased power dissipation due to some alternatives having a higher DC Resistance (DCR).

Recommended alternatives

A strong alternative with significantly higher current ratings and a matching 4020 package.

View details

Alternative comparison matrix

Feature / factor	SMNR4020-10UH	WPN4020H100MT	MAI4020S-100MT	MDA4020-100M	Compatibility / risk
Package	4020	4020	4020	4020	4020 — Package size matches.; MAI4020S-100MT: Package size matches.; MDA4020-100M: Package size matches.
Inductance	10 µH	10 µH	10 µH	10 µH	10 µH — Inductance value matches.; MAI4020S-100MT: Inductance value matches.; MDA4020-100M: Inductance value matches.
Current	1.6A (Rated)	2.8A (Isat), 2.35A (Irms)	2.8A (Isat)	1.9A (Isat)	2.8A (Isat), 2.35A (Irms) / 1.9A (Isat) — Current ratings are a significant upgrade.; MAI4020S-100MT: Saturation current is significantly higher.; MDA4020-100M: Saturation current is higher.
Dcr Ohm	0.165 Ω (Max)	0.180 Ω (Typ)	0.220 Ω	0.215 Ω	0.180 Ω (Typ) / 0.220 Ω / 0.215 Ω — DCR is slightly higher and a typical value, not max.; MAI4020S-100MT: DCR is significantly higher, increasing power loss.; MDA4020-100M: DCR is higher, increasing power loss.
Temperature	-40°C to +125°C	-40°C to +125°C	-	-55°C to +155°C	-40°C to +125°C / -55°C to +155°C — Operating temperature range matches.; MDA4020-100M: Wider operating temperature range.

Application & sourcing insights

Questions & answers

WPN4020H100MT by Sunlord is a strong candidate, offering higher current ratings in the same 4020 package. However, its DC resistance may be slightly higher, so verification is recommended.