Is there a pin-compatible replacement for FDD86102LZ?

Yes, several MOSFETs like NCE1540K and FDD390N15ALZ use the same TO-252 package and pinout. However, their electrical characteristics differ significantly, so they are not drop-in replacements and require engineering review.

What risks should I check before replacing FDD86102LZ?

Key risks include: higher on-resistance (Rds(on)) causing increased heat, lower current rating (Id) leading to failure under load, and different gate characteristics (Vgs(th), Qg) requiring gate driver circuit validation.

FDD86102LZ Alternatives, Datasheet & Cross Reference | onsemi

The onsemi FDD86102LZ is a 100V N-Channel PowerTrench MOSFET in a TO-252 package, optimized for DC-DC converters. Finding a direct replacement requires careful matching of Rds(on), gate charge, and current ratings.

AI replacement insight

Electrical riskhigh

Most alternatives have weaker Rds(on) or current ratings.

Package risklow

TO-252 is a common package with many pin-compatible options.

Sourcing riskmedium

Finding a part that matches all key parameters is difficult.

Can it be replaced directly?

No direct, 1-to-1 replacement was found. All viable candidates have significant parametric trade-offs requiring engineering review.

Best replacement path

Review the application's true current and thermal limits to see if a downgrade like FDD390N15ALZ is viable.

Main risk

Key risks are increased power dissipation from higher Rds(on) and potential failure from lower current ratings in available alternatives.

Recommended alternatives

A form-fit alternative with similar gate drive needs but lower current handling and higher on-resistance.

View details

Alternative comparison matrix

Feature / factor	FDD86102LZ	FDD390N15ALZ	NCE1540K	Compatibility / risk
Package	TO-252 (D-PAK)	TO-252 (D-PAK)	TO-252	TO-252 (D-PAK) — Form-factor compatible.; NCE1540K: Form-factor compatible.
Voltage	100V	150V	150V	150V — Higher voltage rating provides more margin.; NCE1540K: Higher voltage rating provides more margin.
Current	35A	26A	40A	26A / 40A — Lower current rating requires derating.; NCE1540K: Higher current rating.
Resistance	22.5mΩ	42mΩ	45mΩ	42mΩ / 45mΩ — Higher Rds(on) increases conduction losses.; NCE1540K: Higher Rds(on) increases conduction losses.
Gate Charge	18nC	17.6nC	105nC	17.6nC / 105nC — Gate charge is nearly identical, good for driver compatibility.; NCE1540K: Much higher Qg slows switching, increases driver load.

Application & sourcing insights

Questions & answers

No direct drop-in replacement is identified. Candidates like FDD390N15ALZ offer similar gate drive needs but have lower current ratings, while others have higher current but worse efficiency. The best choice depends on specific application margins.