ProjectsPricingInsights

Best Alternatives to FDS4435BZ

Package: 8-SOIC (0.154", 3.90mm Width)onsemiMOSFETs - SingleSeries: PowerTrench®Package: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Technology: MOSFET (Metal Oxide)Drain to Source Voltage (Vdss): 30 VCurrent - Continuous Drain (Id) @ 25°C: 8.8A (Ta)

FDS4435BZ replacement review found no verified pin-compatible substitute. AO4419 is the closest listed candidate, pending pinout and SOA checks.

AI replacement insight

Electrical riskmedium

RDS(on), ID, SOA, and Qg must be checked.

Package riskmedium

8-SOIC matches, but pin functions are missing.

Firmware risklow

Discrete MOSFET; no firmware interface.

Sourcing riskmedium

AO4419 is cross-vendor.

Can it be replaced directly?

No verified direct replacement is proven from the provided fields.

Best replacement path

Start with AO4419, then verify pinout, SOA, thermal rise, and switching loss.

Main risk

Pinout is not verified for any candidate.

Recommended alternatives

1
AO4421 package
AO4421

Alpha & Omega Semiconductor Inc.

Needs validationhigh risk

AO4421 is a higher-voltage relaxed option with significant current derating.

View details

Alternative comparison matrix

Feature / factorFDS4435BZAO4419FDS4685AO4421Compatibility / risk
Package8-SOIC8-SOIC8-SOIC8-SOIC8-SOIC — same package text; FDS4685: same package text; AO4421: same package text
Pinout8 pins8 pins8 pins8 pins8 pins — pin roles not shown; FDS4685: pin roles not shown; AO4421: pin roles not shown
Voltage-30 V-30 V-40 V-60 V-30 V / -40 V / -60 V — same VDS; FDS4685: higher VDS; AO4421: higher VDS
Current-8.8 A-9.7 A-8.2 A-6.2 A-9.7 A / -8.2 A / -6.2 A — higher ID; FDS4685: less ID; AO4421: large derating
Power20 mΩ<20 mΩ27 mΩ<40 mΩ<20 mΩ / 27 mΩ / <40 mΩ — RDS(on) similar; FDS4685: more loss; AO4421: more loss

Application & sourcing insights

Questions & answers

AO4419 is the closest listed candidate, but it still needs pinout, SOA, and thermal review.