Alternatives to onsemi MMBZ5242BLT1
onsemi MMBZ5242BLT1 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 MMBZ5242BLT1onsemi | MMBZ5242BLT1Gonsemi |  MMBZ5242B-7-FDiodes Incorporated | +4more | |
|---|---|---|---|---|
| FFF Compatibility | Both parts share the identical SOT-23 footprint with the same 3-pin assignment (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode).Both parts are housed in the standard SOT-23 package with identical mechanical dimensions.Exact electrical match with 12V Zener voltage, 5% tolerance, 30 Ohms impedance, and 225 mW power dissipation. | Housed in a standard SOT-23 package with matching pin configuration (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode).Standard SMD SOT-23 package, fitting the exact same board land pattern.Electrical properties match or exceed the original, featuring a higher maximum power rating. | ||
 AI Summary | MMBZ5242BLT1 by onsemi: Zener Diode 12 V 225 mW ±5% Surface Mount SOT-23-3 (TO-236). | This is the direct manufacturer-recommended lead-free replacement for the obsolete MMBZ5242BLT1. It maintains identical electrical and physical characteristics while conforming to modern environmental RoHS standards.
| This is a highly reliable second-source alternative from Diodes Inc. It offers a higher power rating of 350 mW compared to the original 225 mW, providing additional thermal safety margins in your design.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Zener Diode 12 V 225 mW ±5% Surface Mount SOT-23-3 (TO-236) | Zener Diode 12 V 225 mW ±5% Surface Mount SOT-23-3 (TO-236) | Zener Diode 12 V 350 mW ±5% Surface Mount SOT-23-3 | |
| Manufacturer | onsemi | onsemi | Diodes Incorporated | |
| Type | Diodes | Diodes | Diodes | |
| Datasheet | Open | Open | Open | |
| Lead Time | 17 weeks | 52 weeks | 52 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.10.0050 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Tolerance | ±5% | - | - | |
| Power - Max | 225 mW | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | - | - | |
| Impedance (Max) (Zzt) | 30 Ohms | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 MMBZ5242Bonsemi | Non-stock | Obsolete | 5Alternatives availableSee Alternatives |
 MMSZ5245Bonsemi | In stock | Obsolete | 5Alternatives availableSee Alternatives |
 MMBT2222ALT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| MMBT2907ALT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| MMBT100Aonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi MMBZ5242BLT1 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 MMBZ5242BLT1 are the MMBZ5242BLT1G (onsemi) and the MMBZ5242B-7-F (Diodes Incorporated), out of 6 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 MMBZ5242BLT1 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 MMBZ5242BLT1 (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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