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Alternatives to onsemi FAN5071M

onsemi FAN5071M and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

FAN5071M compared against its qualified second sources
FAN5071MonsemiFAN5059MonsemiISL6524CBZRenesas Electronics+1more
FFF CompatibilityWhile it shares the exact same SOIC-24 wide footprint and physical body dimensions, the pin assignments are not a 100% direct match, and it has a slightly different VID programming range.Both parts are housed in a standard 24-lead SOIC wide package with a 7.5mm body width and 1.27mm lead pitch.The FAN5059M provides synchronous buck regulation but has a different 5-bit DAC output voltage programming range (1.3V to 3.5V) compared to the FAN5071M (1.05V to 1.825V).Housed in a 28-pin SOIC wide package, which requires a circuit board redesign compared to the 24-pin SOIC footprint of the FAN5071M.Both use a wide SOIC package style, but the ISL6524 has a larger 28-pin body instead of 24-pin.Identical core VRM 8.5 buck controller functionality, matching the 5-bit DAC voltage programming steps and offering auxiliary linear regulator control.
AI Summary

FAN5071M by onsemi: Switching Controllers DC/DC.

The FAN5059M is an obsolete sibling controller from the same family that shares the same SOIC-24 wide package. It serves as a close legacy replacement if the application's target voltage falls within its 1.3V to 3.5V programmable range, though minor circuit adjustments may be needed due to pinout variations.

  • Same package footprint (SOIC-24 wide) and physical dimensions
  • Same pin count (24 pins) and very similar internal gate drive architecture
  • Manufactured by the same legacy supplier (Fairchild/onsemi)
  • Obsolete part requiring sourcing from legacy or surplus distributors
  • Different VID programmable voltage range (1.3V to 3.5V vs. 1.05V to 1.825V)

The ISL6524CBZ is a highly compatible VRM 8.5 dual-rail and multi-linear controller from Renesas (Intersil). It matches the precise 5-bit VID core voltage ranges of the FAN5071M but requires a board footprint layout redesign to accommodate its larger 28-pin SOIC package.

  • Fully compliant with the Intel VRM 8.5 specifications, matching the exact 1.05V to 1.825V DAC output range in 25mV steps
  • Includes integrated triple linear regulators matching the multi-rail power distribution of the FAN5071M
  • Provides high efficiency synchronous rectification with robust overcurrent and overvoltage protections
  • Housed in a larger 28-pin SOIC package, requiring a complete footprint layout redesign
  • This part is also mature/obsolete, meaning it is best suited for servicing existing legacy systems rather than new designs
Lifecycle StatusObsoleteUnknownUnknown
Market AvailabilityDiscontinuedUnknownUnknown
REACHUnknownUnknownUnknown
RoHSRoHSUnknownUnknown
DescriptionSwitching Controllers DC/DCThe FAN5059M is an obsolete sibling controller from the same family that shares the same SOIC-24 wide package. It serves as a close legacy rThe ISL6524CBZ is a highly compatible VRM 8.5 dual-rail and multi-linear controller from Renesas (Intersil). It matches the precise 5-bit VI
ManufactureronsemionsemiRenesas Electronics
TypeSwitching ControllersComponentComponent
DatasheetOpenN/AN/A
Lead TimeUnknownUnknownUnknown
Country of Origin---
Export Control Class NumberEAR99EAR99EAR99
HTSUS Code8542310030--
Moisture Sensitivity Level---

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Frequently asked questions

Yes. The onsemi FAN5071M is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.

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