MMSZ5257C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5257C-TP is a 33 V, 500 mW Zener diode manufactured by Micro Commercial Co, designed for surface mount applications in SOD-123 packaging. This component is classified as an interface diode and maintains Active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

MMSZ5257C-TP

Micro Commercial CoIn Stock: 1098MMSZ5257C-TP Datasheet

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DDZ33-7

Diodes IncorporatedIn Stock: 6154DDZ33-7 Datasheet

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DDZ33S-7

Diodes IncorporatedIn Stock: 6371DDZ33S-7 Datasheet

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DDZ9714-7

Diodes IncorporatedIn Stock: 52598DDZ9714-7 Datasheet

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MMSZ5257BS-7-F

Diodes IncorporatedIn Stock: 8851MMSZ5257BS-7-F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ5257C-TP is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage (Vz): 33 V nominal
• Package type: SOD-123 or SOD-323 (surface mount, compatible footprints)
• Mounting type: Surface mount
• Forward voltage (Vf): 900 mV @ 10 mA maximum
• Operating temperature range: Minimum -55°C to 150°C coverage

Secondary Compatibility Factors:

• Power dissipation rating: Equal to or greater than 500 mW for direct replacement; lower ratings acceptable for reduced power applications
• Tolerance: ±2% to ±5% acceptable within design margin
• Impedance: 58 to 75 Ohms acceptable range
• Reverse leakage current: 50 to 100 nA @ specified voltage

Substitute parts are grouped by package compatibility and power rating to enable selection based on application requirements and thermal constraints.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (SOD-123 Package):

DDZ9714-7 provides full electrical equivalence to MMSZ5257C-TP with identical 33 V nominal voltage, 500 mW power rating, and SOD-123 package compatibility. This part maintains the same forward voltage characteristic (900 mV @ 10 mA) and reverse leakage specification (50 nA @ 25 V). The tolerance specification widens to ±5%, which remains within acceptable design margins for most interface applications. DDZ9714-7 carries ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), supporting high-volume manufacturing environments.

Reduced Power Applications (SOD-123 Package):

DDZ33-7 operates at 310 mW maximum power dissipation with ±2.5% tolerance and SOD-123 package compatibility. This part is suitable for applications where thermal constraints or lower power requirements permit reduced power ratings. The impedance specification (75 Ohms) and reverse leakage (50 nA @ 27 V) remain within acceptable operating parameters.

Compact Package Alternatives (SOD-323 Package):

DDZ33S-7 and MMSZ5257BS-7-F both utilize SOD-323 packaging with 200 mW power ratings. DDZ33S-7 provides ±2.5% tolerance with 75 Ohms impedance. MMSZ5257BS-7-F maintains the same base product number as the main part with ±5% tolerance and 58 Ohms impedance, matching the original impedance specification. Both parts support space-constrained PCB layouts while maintaining 33 V nominal voltage and 900 mV forward voltage characteristics.

All substitute parts maintain Active product status and REACH Unaffected compliance classification.

Frequently Asked Questions (FAQ)

Q: Can DDZ9714-7 replace MMSZ5257C-TP in all applications?

A: DDZ9714-7 provides electrical equivalence with identical 33 V nominal voltage, 500 mW power rating, and SOD-123 package compatibility. The tolerance specification of ±5% (versus ±2% for MMSZ5257C-TP) remains within acceptable design margins for interface diode applications. Verification of tolerance requirements in the specific circuit design is necessary before selection.

Q: What is the difference between SOD-123 and SOD-323 packages?

A: SOD-123 and SOD-323 are both surface mount packages for two-terminal diodes. SOD-323 (also designated SC-76) provides a more compact footprint suitable for space-constrained applications. Both packages are mechanically and electrically compatible with standard reflow soldering processes. PCB layout and thermal management considerations determine package selection.

Q: Are the substitute parts suitable for high-temperature applications?

A: All substitute parts support operating temperature ranges of -65°C to 150°C (TJ), which exceeds the MMSZ5257C-TP specification of -55°C to 150°C. Substitute parts provide extended low-temperature performance for applications requiring operation below -55°C.

Q: What is the significance of the ±2% versus ±5% tolerance difference?

A: Tolerance specifications define the acceptable deviation of the nominal 33 V zener voltage from the specified value. MMSZ5257C-TP maintains ±2% tolerance, while DDZ9714-7 and MMSZ5257BS-7-F specify ±5% tolerance. Circuit designs with tight voltage regulation requirements must account for the wider tolerance range in substitute parts.

Q: Can lower power-rated parts (DDZ33-7, DDZ33S-7, MMSZ5257BS-7-F) replace the 500 mW MMSZ5257C-TP?

A: Lower power-rated substitutes are applicable only when the circuit design operates below the reduced power dissipation limits. DDZ33-7 (310 mW) and DDZ33S-7 / MMSZ5257BS-7-F (200 mW) are suitable for applications with lower power requirements. Thermal analysis and power budget verification are required to confirm compatibility.

Q: What packaging format differences exist between the main part and substitutes?

A: MMSZ5257C-TP is supplied in Bulk packaging, while all substitute parts are supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes and high-volume production. Bulk packaging conversion or reel procurement may be required to match existing supply chain processes.