All Alternatives

Alternatives to onsemi FAN1117ASX

onsemi FAN1117ASX and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for onsemi FAN1117ASX

FAN1117ASX compared against its qualified second sources
FAN1117ASXonsemiNCP1117STAT3GonsemiLD1117ASTRSTMicroelectronics+3more
FFF CompatibilityThe package, footprint, pin assignments (Pin 1: ADJ/GND, Pin 2/Tab: OUT, Pin 3: IN) are identical to the original FAN1117ASX, allowing for a direct drop-in replacement on existing PCBs.Housed in the identical SOT-223 surface mount package, retaining identical mechanical dimensions.Matches the adjustable output configuration, 1.25V reference voltage, and 1A output current capability, while offering a superior maximum input voltage rating of 20V (compared to 18V).Features the identical pinout (Pin 1: ADJ/GND, Pin 2/Tab: OUT, Pin 3: IN) and package footprint as the original device.Housed in the standard SOT-223 package, fitting the same mechanical profile.The maximum input voltage rating is 15V, which is lower than the original 18V rating. However, it meets or exceeds all other electrical parameters and offers a wider temperature range.
AI Summary

FAN1117ASX by onsemi: Linear Voltage Regulator IC Positive Adjustable 1 Output 1A SOT-223-4.

This is the primary recommended drop-in alternative from onsemi, offering the same 1A current capacity, identical SOT-223 pinout, and a slightly higher input voltage limit of 20V. An industrial-grade variant with a wider temperature range (-40°C to 125°C) is also available under the MPN NCP1117ISTAT3G.

  • Direct drop-in replacement from the same manufacturer (onsemi).
  • Higher maximum input voltage (20V vs. 18V of original).
  • Identical pinout and standard SOT-223 package footprint.

This is a highly reliable alternative from STMicroelectronics that supports the full 1A output current and extends the low-end operating temperature down to -40°C. Note that the maximum input voltage is reduced from 18V to 15V.

  • Wider operating junction temperature range (-40°C to 125°C vs 0°C to 125°C).
  • Drop-in compatible pinout and SOT-223 footprint.
  • Maintains the full 1A output current rating.
  • Lower maximum input voltage rating (15V vs. 18V).
Lifecycle StatusObsoleteActiveActive
Market AvailabilityDiscontinuedIn stockIn stock
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Frequently asked questions

Yes. The onsemi FAN1117ASX 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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