MMBZ5258BW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5258BW-TP is a 36 V, 200 mW Zener diode manufactured by Micro Commercial Co in SOT-323 surface mount packaging. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. 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

MMBZ5258BW-TP

Micro Commercial CoIn Stock: 1146MMBZ5258BW-TP Datasheet

Current PartRFQ

CMSZ5258B TR PBFREE

Central Semiconductor CorpIn Stock: 6653CMSZ5258B TR PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ5258BW-TP is determined by strict equivalence in the following critical parameters:

Zener voltage specification (36 V nominal with ±5% tolerance) must remain constant across all substitute parts. The SOT-323 package and surface mount configuration are mandatory mechanical requirements. Impedance maximum (70 Ohms) and reverse leakage current (100 nA @ 27 V) establish the electrical performance baseline. Forward voltage characteristics (900 mV @ 10 mA) must match exactly.

The CMSZ5258B TR PBFREE from Central Semiconductor Corp qualifies as a direct substitute because it maintains identical zener voltage, tolerance, impedance, reverse leakage, and forward voltage specifications. The substitute part operates across an extended lower temperature range (-65°C versus -55°C), which provides additional operational margin. Maximum power dissipation differs (275 mW versus 200 mW), representing a higher capability that does not restrict application compatibility. Both parts share identical RoHS3 compliance, MSL rating, and REACH status.

Parameter Comparison

Engineering Selection Recommendations

Both the MMBZ5258BW-TP and CMSZ5258B TR PBFREE are active products with full regulatory compliance. Selection between these parts is based on application requirements and supply availability.

The MMBZ5258BW-TP operates within the temperature range of -55°C to 150°C and dissipates up to 200 mW. This specification is suitable for standard industrial and commercial applications where ambient temperatures remain above -55°C.

The CMSZ5258B TR PBFREE extends the lower operating temperature to -65°C and provides 275 mW maximum power dissipation. This substitute is appropriate for applications requiring enhanced low-temperature performance or where thermal margin is a design consideration. The higher power rating does not introduce incompatibility in circuits designed for the original 200 mW specification.

Both parts maintain identical electrical characteristics in zener voltage, impedance, leakage current, and forward voltage. Mechanical compatibility is assured through identical SOT-323 packaging and surface mount configuration. Regulatory compliance is equivalent across RoHS3, REACH, and moisture sensitivity classifications.

Frequently Asked Questions (FAQ)

Q: Can the CMSZ5258B TR PBFREE replace the MMBZ5258BW-TP in existing designs?

A: Yes. The substitute part maintains identical zener voltage (36 V), tolerance (±5%), impedance (70 Ohms), reverse leakage (100 nA @ 27 V), and forward voltage (900 mV @ 10 mA) specifications. SOT-323 package compatibility and surface mount configuration are identical. No circuit redesign is required.

Q: What is the difference in power dissipation between these parts?

A: The MMBZ5258BW-TP is rated for 200 mW maximum power dissipation. The CMSZ5258B TR PBFREE is rated for 275 mW. The substitute part has higher power capability, which does not restrict its use in applications designed for the original 200 mW specification.

Q: Are there temperature range differences?

A: The MMBZ5258BW-TP operates from -55°C to 150°C. The CMSZ5258B TR PBFREE operates from -65°C to 150°C. The substitute part extends the lower temperature limit by 10°C, providing additional operational margin for low-temperature environments.

Q: Do both parts have the same regulatory compliance?

A: Yes. Both the MMBZ5258BW-TP and CMSZ5258B TR PBFREE are RoHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited moisture sensitivity). Regulatory status is equivalent.

Q: Are the packages identical?

A: Yes. Both parts use the SOT-323 package in surface mount configuration. Footprint, lead spacing, and mounting requirements are identical. No PCB layout modifications are necessary.

Q: What determines whether a part qualifies as a substitute?

A: Substitution is based on matching zener voltage, tolerance, impedance, reverse leakage current, forward voltage, and package type. The CMSZ5258B TR PBFREE meets all these criteria. Differences in maximum power dissipation and operating temperature range do not disqualify substitution when the substitute part meets or exceeds the original specification.