MMSZ36VCF Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ36VCF is a 36 V, 1 W surface mount zener diode manufactured by onsemi in SOD-123F packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Substiute Parts

MMSZ36VCF

onsemiIn Stock: 883MMSZ36VCF Datasheet

Current PartRFQ

MMSZ36T1G

onsemiIn Stock: 16392MMSZ36T1G Datasheet

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ACZRM5258B-HF

Comchip TechnologyIn Stock: 1072ACZRM5258B-HF Datasheet

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BZT52HC36WF-7

Diodes IncorporatedIn Stock: 4054BZT52HC36WF-7 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMSZ36VCF is determined by the following critical parameters:

Primary Matching Criteria:

• Zener voltage nominal value: 36 V
• Voltage tolerance: ±5% or tighter
• Mounting type: Surface Mount
• RoHS3 compliance requirement

Secondary Compatibility Factors:

• Package compatibility: SOD-123F or SOD-123 (same footprint family)
• Power dissipation capability: Minimum 500 mW for reduced-power applications; 1 W for full-power equivalence
• Operating temperature range: Minimum -55°C to 150°C
• Impedance characteristics: Maximum 90 Ohms acceptable for regulation applications

The substitute parts listed below meet the primary matching criteria and maintain functional equivalence within specified electrical parameters. Power rating differences indicate reduced thermal capability, requiring thermal design review in high-dissipation applications.

Parameter Comparison

Engineering Selection Recommendations

MMSZ36T1G (onsemi) is the primary direct substitute. This part maintains the same manufacturer lineage and base product number (MMSZ36), ensuring design continuity. It is active in production with 16,305 units in stock. The 500 mW power rating represents a 50% reduction from the original 1 W specification; applications requiring full 1 W dissipation must implement thermal management review. The SOD-123 package is mechanically compatible with SOD-123F footprints. Operating temperature range extends to -55°C, providing broader environmental coverage than the original part.

ACZRM5258B-HF (Comchip Technology) provides automotive-grade qualification (AEC-Q101) with 500 mW power rating. The SOD-123F package matches the original footprint exactly. Impedance of 70 Ohms and reverse leakage of 100 nA @ 27 V remain within acceptable regulation parameters. This part is suitable for automotive and industrial applications requiring certified component traceability.

BZT52HC36WF-7 (Diodes Incorporated) offers automotive-grade qualification (AEC-Q101) with the lowest power rating at 375 mW. The SOD-123F package provides exact footprint compatibility. Operating temperature range extends to -65°C. Voltage tolerance of ±5.56% remains within acceptable specification variance. This part is recommended for cost-optimized designs where power dissipation does not exceed 375 mW.

All three substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can MMSZ36T1G replace MMSZ36VCF in all applications?

A: MMSZ36T1G is functionally equivalent for voltage regulation and transient protection. The primary difference is power dissipation capability: 500 mW versus 1 W. Applications operating at or near 1 W continuous dissipation require thermal analysis to confirm the reduced power rating is acceptable. The SOD-123 package is mechanically compatible with SOD-123F PCB footprints.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: Both packages are surface mount diodes with identical electrical performance and PCB footprint compatibility. SOD-123F is a variant designation used by some manufacturers. The MMSZ36T1G in SOD-123 and ACZRM5258B-HF in SOD-123F are interchangeable from a PCB assembly perspective.

Q: Are the automotive-grade parts (ACZRM5258B-HF and BZT52HC36WF-7) required for non-automotive applications?

A: Automotive-grade qualification (AEC-Q101) is not required for non-automotive applications. However, these parts offer additional reliability testing and traceability documentation. Selection should be based on application requirements and supply chain preferences rather than automotive qualification alone.

Q: How does impedance affect zener diode performance?

A: Impedance (Zzt) affects voltage regulation quality under load changes. Lower impedance provides better regulation stability. The MMSZ36VCF specifies 40 Ohms maximum. Substitute parts range from 60 to 90 Ohms maximum. For applications requiring impedance below 70 Ohms, ACZRM5258B-HF (70 Ohms) or BZT52HC36WF-7 (60 Ohms) are preferred over MMSZ36T1G (90 Ohms).

Q: What does reverse leakage current indicate?

A: Reverse leakage current measures the small current flowing through the zener diode when reverse-biased below the zener voltage. Lower leakage indicates better blocking performance. The MMSZ36VCF specifies 1 µA @ 27 V, while substitutes range from 50 to 100 nanoamperes. Substitute parts exhibit superior reverse leakage characteristics, resulting in lower standby power consumption.

Q: Can I use a 375 mW part (BZT52HC36WF-7) where a 1 W part was originally specified?

A: Power rating substitution requires application analysis. If the circuit dissipates less than 375 mW in the zener diode, the BZT52HC36WF-7 is suitable. If dissipation approaches or exceeds 375 mW, thermal stress and reduced component life result. Thermal design review is mandatory before substitution.

Q: Are all substitute parts in active production?

A: Yes. MMSZ36T1G, ACZRM5258B-HF, and BZT52HC36WF-7 are all active products with current inventory availability. The original MMSZ36VCF is obsolete, making substitution necessary for new designs and production continuity.