Alternatives to onsemi MMSZ5245B
onsemi MMSZ5245B 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 MMSZ5245B
 MMSZ5245Bonsemi |  MMSZ5245BT1Gonsemi |  MMSZ5245B-7-FDiodes Incorporated | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Identical SOD-123 surface mount footprint with matching cathode (Pin 1) and anode (Pin 2) assignments.Shares the exact package dimensions and lead shape of the original part.Matches all electrical parameters: 15V nominal Zener voltage, 5% tolerance, 500mW power dissipation, and 16 Ohm maximum impedance. | Perfect fit for the standard SOD-123 land pattern with identical terminal polarization.Standard SOD-123 package dimensions (approx. 2.69mm x 1.6mm) matching the original form factor.Electrical characteristics are fully equivalent, including the 16 Ohm maximum impedance and 100 nA reverse leakage. | ||
 AI Summary | MMSZ5245B by onsemi: Zener Diode 15 V 500 mW ±5% Surface Mount SOD-123. | This is the direct modern active equivalent from the original manufacturer (onsemi) under their lead-free / RoHS-compliant part numbering scheme. It offers identical physical, mechanical, and electrical performance to the obsolete base part number.
| Diodes Inc.'s version is a highly reliable, widely-stocked second source that serves as a direct drop-in replacement in standard SOD-123 layouts. It completely matches all target electrical and physical specs.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 MMSZ5242Bonsemi | Non-stock | Obsolete | 3Alternatives availableSee Alternatives |
 ZMM5245BDiodes Incorporated | Non-stock | Obsolete | 3Alternatives availableSee Alternatives |
| MMSZ5239Bonsemi | In stock | Obsolete | 6Alternatives availableSee Alternatives |
| MMSZ5226Bonsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 MMBZ5242Bonsemi | Non-stock | Obsolete | 5Alternatives availableSee Alternatives |
 MMBZ5242BLT1onsemi | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi MMSZ5245B 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.
The closest qualified second sources for the onsemi MMSZ5245B are the MMSZ5245BT1G (onsemi) and the MMSZ5245B-7-F (Diodes Incorporated), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Yes. The leading alternatives to the MMSZ5245B are fit-, form- and function-compatible — the same package and pinout with matching key electrical specifications — so they drop in without PCB changes. Always confirm the parameters critical to your design against the alternative's datasheet before committing.
The MMSZ5245B (onsemi) is a part in the Diodes category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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