What risks should I check before replacing VLCF4020T-100MR85?

Key risks include package mismatch, which requires a PCB redesign. Also, check for higher DC Resistance (DCR), which can lower efficiency and increase heat. Finally, verify the saturation current (Isat) meets or exceeds the original 0.85A requirement for your application.

VLCF4020T-100MR85 Alternatives, Datasheet & Cross Reference | TDK Electronics AG

Reviewing alternatives for the TDK VLCF4020T-100MR85, a 10µH power inductor in a 4020 package. Key considerations for replacements include matching the 4.0x4.0mm footprint, saturation current (Isat), and DC resistance (DCR).

AI replacement insight

Electrical riskmedium

DC Resistance (DCR) and current ratings can vary, impacting efficiency and performance.

Package riskhigh

Many functional alternatives are in different packages, requiring a PCB redesign.

Sourcing risklow

This is a common inductor value and package size with multiple vendor options.

Can it be replaced directly?

Yes, form-fit alternatives in the same 4020 package exist. MDA4020-100M is a strong candidate.

Best replacement path

Upgrade to a 4020 package inductor with higher Isat, like MDA4020-100M.

Main risk

The main risk is selecting a part with a different package size or significantly higher DC Resistance (DCR).

Recommended alternatives

Offers the same 4020 footprint and inductance with a much higher saturation current.

View details

Alternative comparison matrix

Feature / factor	VLCF4020T-100MR85	MAI4020S-100MT	MDA4020-100M	VLS5045EX-100M	Compatibility / risk
Package	4020 (4.0 x 4.0 mm)	4020	4020	5045	4020 / 5045 — Package size matches, check datasheet for exact land pattern.; MDA4020-100M: Package size matches, check datasheet for exact land pattern.; VLS5045EX-100M: Larger package (5.0x5.0mm) requires PCB redesign.
Current	0.85 A	2.8 A	1.9 A	3.1 A	2.8 A / 1.9 A / 3.1 A — Significantly higher saturation current provides more headroom.; MDA4020-100M: Higher saturation current is a significant upgrade.; VLS5045EX-100M: Significantly higher saturation current.
Resistance	0.185 Ω	0.22 Ω	0.215 Ω	0.061 Ω	0.22 Ω / 0.215 Ω / 0.061 Ω — Higher DCR may reduce efficiency.; MDA4020-100M: Slightly higher DCR may reduce efficiency.; VLS5045EX-100M: Much lower DCR improves efficiency.
Temperature	-40 to +105 °C	-40°C to +125°C	-55°C to +155°C	-	-40°C to +125°C / -55°C to +155°C — Wider operating temperature range.; MDA4020-100M: Wider operating temperature range.

Application & sourcing insights

Questions & answers

Verified drop-in options for VLCF4020T-100MR85 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.