All Alternatives

Alternatives to onsemi MMBZ5242B

onsemi MMBZ5242B 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 MMBZ5242B

MMBZ5242B compared against its qualified second sources
MMBZ5242BonsemiMMBZ5242BLT1GonsemiMMBZ5242B-7-FDiodes Incorporated+3more
FFF CompatibilityIdentical SOT-23-3 package dimensions and pin assignments (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode).Direct physical footprint and package outline match.Functionally equivalent except for a lower maximum power rating specification (225 mW vs 350 mW).Identical SOT-23 package outline and pinouts (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode).Exact physical SOT-23 package shape, dimensions, and mounting style.Meets or exceeds all original electrical specifications, including the 350 mW power rating.
AI Summary

MMBZ5242B by onsemi: Zener Diode 12 V 350 mW ±5% Surface Mount SOT-23-3.

This is the direct modern successor and active sibling from onsemi, offering the same 12V Zener voltage and pinout. While its maximum power rating is specified at 225 mW compared to the original 350 mW specification, this is largely a result of standardized modern datasheet testing on minimal copper land pads. For most standard signal-level circuits, it operates as a direct drop-in replacement.

  • Same original manufacturer (onsemi) and series root
  • Active lifecycle status
  • Identical 12V Zener voltage and ±5% tolerance
  • Lower maximum power dissipation rating (225 mW vs 350 mW)

This is an active, highly reliable second-source replacement from Diodes Incorporated. It perfectly matches the original 350 mW power dissipation limit and electrical tolerances, offering a direct drop-in solution without requiring any board modifications. It features the standard '-7-F' packing code denoting a lead-free, environmentally green device on a 7-inch reel.

  • True drop-in replacement from a major second-source manufacturer
  • Matches the original 350 mW maximum power dissipation rating
  • Identical electrical parameters (12V Zener voltage, ±5% tolerance, 1 uA leakage)
Lifecycle StatusObsoleteActiveActive
Market AvailabilityNon-stockIn stockIn stock
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Related parts

PartMarket availabilityLifecycleAlternatives available
MMSZ5242BonsemiNon-stockObsolete3Alternatives availableSee Alternatives
MMBZ5242BLT1onsemiDiscontinuedObsolete6Alternatives availableSee Alternatives
MMSZ5245BonsemiIn stockObsolete5Alternatives availableSee Alternatives
MMSZ5226BonsemiDiscontinuedObsolete5Alternatives availableSee Alternatives
ZMM5245BDiodes IncorporatedNon-stockObsolete3Alternatives availableSee Alternatives
MMSZ5239BonsemiIn stockObsolete6Alternatives availableSee Alternatives

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Frequently asked questions

Yes. The onsemi MMBZ5242B 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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