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Alternatives to onsemi FAN2559MP15X

onsemi FAN2559MP15X and its qualified second sources, compared on form, fit and function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for onsemi FAN2559MP15X

FAN2559MP15X compared against its qualified second sources
FAN2559MP15XonsemiFAN2558MP15XonsemiTPS74515PQWDRVRQ1Texas Instruments
FFF CompatibilityPinout matches perfectly on pins 1, 3, 4, 5, and 6. However, pin 2 is a No Connect (NC) instead of the Noise Bypass (BYP) pin found on the original part.Uses the exact same 2x2mm 6-Lead MLP package with identical physical dimensions and land pattern.Provides the same 1.5V output voltage and 180mA load current capabilities.Pin assignments are incompatible and require a board redesign: PG and GND are swapped (pins 3 and 5), and pin 2 is NC instead of BYP.Housed in a standard 6-pin 2x2mm WSON package, which fits the same physical space on the PCB.Meets and exceeds all primary electrical specifications, providing the same 1.5V regulated output with superior current and thermal performance.
AI Summary

FAN2559MP15X by onsemi: Linear Voltage Regulator IC Positive Fixed 1 Output 180mA 6-DFN (2x2).

This is the closest sibling part in the same family, sharing the exact same MLP-6 package and electrical specs. It acts as a direct drop-in replacement if the original design does not utilize the optional external noise bypass capacitor on pin 2. Note that this part is also officially obsolete but remains available through authorized aftermarket channels.

  • Drop-in sibling with identical 2x2mm MLP-6 package footprint
  • Direct match for 1.5V output voltage and 180mA current rating
  • Maintains Power Good (PG) and Enable (EN) features
  • Lacks the low-noise external bypass capacitor pin (pin 2 is NC), resulting in slightly higher output noise
  • This part is also discontinued by the manufacturer, presenting long-term lifecycle risks

A modern, active LDO regulator that functions as an excellent second-source alternative. While it requires a board redesign due to a different pin layout (GND and PG are swapped, and the bypass pin is absent), it offers vastly superior output current capability and modern protection features.

  • Active and widely available modern LDO with long-term lifecycle support
  • Higher output current capability of 500mA vs the original 180mA
  • Excellent PSRR and transient response for noise-sensitive circuits
  • Requires a PCB layout redesign because PG and GND pin assignments are swapped
  • Lacks the external noise bypass capacitor pin
Lifecycle StatusObsoleteObsoleteActive
Market AvailabilityDiscontinuedIn stockIn stock
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