MMBZ5235B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5235B-TP is a 6.8 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications (nominal Zener voltage, tolerance, and thermal operating range) and mechanical compatibility (SOT-23 package form factor). Substitute parts may differ in maximum power rating, impedance characteristics, and product status, requiring engineering evaluation for specific application requirements.

Substiute Parts

MMBZ5235B-TP

Micro Commercial CoIn Stock: 819MMBZ5235B-TP Datasheet

Current PartRFQ

BZX84C6V8-HE3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 3151BZX84C6V8-HE3-08 Datasheet

SimilarRFQ

MMBZ5235BLT1G

onsemiIn Stock: 65240MMBZ5235BLT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMBZ5235B-TP is determined by the following critical parameters:

Primary Matching Criteria:

• Nominal Zener voltage: 6.8 V
• Voltage tolerance: ±5%
• Package type: SOT-23-3 (TO-236-3, SC-59)
• Mounting type: Surface Mount
• Operating temperature range: -55°C to 150°C minimum

Secondary Consideration Parameters:

• Maximum power dissipation (350 mW baseline)
• Impedance (Zzt) maximum value
• Reverse leakage current characteristics
• Forward voltage characteristics

Substitute parts identified in this reference maintain the primary matching criteria. Variations in maximum power rating and impedance values are noted in the parameter comparison table and must be evaluated against specific circuit requirements. Parts with lower power ratings require thermal analysis to confirm suitability in the target application.

Parameter Comparison

Engineering Selection Recommendations

MMBZ5235BLT1G (onsemi) is the primary substitute for the MMBZ5235B-TP. Both parts share identical base product numbering (MMBZ5235), matching impedance characteristics (5 Ohms maximum), and identical forward voltage specifications. The onsemi variant maintains Active product status and ROHS3 compliance. The operating temperature range extends to -65°C, providing broader low-temperature performance. Maximum power dissipation is reduced to 225 mW; applications requiring the full 350 mW rating must confirm thermal margins through circuit analysis.

BZX84C6V8-HE3-08 (Vishay General Semiconductor) maintains electrical equivalence at the nominal Zener voltage and tolerance level. This part carries AEC-Q101 automotive qualification and ROHS3 compliance. However, the product status is listed as Obsolete, indicating potential supply chain constraints. Maximum power rating is 300 mW, and impedance is specified at 15 Ohms maximum, representing a 3× increase relative to the main part. Applications sensitive to impedance variation require detailed circuit simulation before selection.

All three parts are mechanically compatible within SOT-23-3 surface mount assembly processes and share identical HTSUS and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5235BLT1G replace MMBZ5235B-TP in all applications?

A: MMBZ5235BLT1G is electrically equivalent for nominal Zener voltage, tolerance, and impedance characteristics. The maximum power dissipation is reduced from 350 mW to 225 mW. Applications operating at or near the 350 mW thermal limit require thermal analysis to confirm the lower power rating is acceptable. Both parts are mechanically compatible in SOT-23-3 surface mount packages.

Q: Why is BZX84C6V8-HE3-08 listed as Obsolete?

A: Product status reflects manufacturer lifecycle classification. Obsolete designation indicates the part is no longer in active production. While electrical specifications remain valid for substitution purposes, long-term supply availability may be limited. The part is suitable for immediate replacement applications but not recommended for new designs requiring extended production support.

Q: What is the significance of impedance differences between these parts?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode at operating current. MMBZ5235B-TP and MMBZ5235BLT1G specify 5 Ohms maximum impedance, while BZX84C6V8-HE3-08 specifies 15 Ohms maximum. In applications with varying load currents or high-frequency ripple, higher impedance results in greater voltage variation across the Zener. Circuit designs with tight voltage regulation requirements should maintain impedance consistency.

Q: Are all three parts ROHS3 compliant?

A: Yes. MMBZ5235B-TP, BZX84C6V8-HE3-08, and MMBZ5235BLT1G are all ROHS3 compliant and REACH unaffected. All parts are suitable for applications subject to European Union environmental regulations.

Q: What is the difference between the packaging options listed?

A: MMBZ5235B-TP is supplied in Tape & Reel (TR) format. BZX84C6V8-HE3-08 is supplied in Cut Tape (CT) and Digi-Reel format. MMBZ5235BLT1G is supplied in Cut Tape (CT) and Digi-Reel format. All three parts use identical SOT-23-3 component packages; packaging format differences relate to supply reel configuration and do not affect component electrical or mechanical specifications.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. All three parts are mechanically compatible within SOT-23-3 surface mount assembly processes. Footprint, lead spacing, and solder pad requirements are identical. Component selection should be based on electrical parameter requirements (power dissipation, impedance) and supply chain availability rather than assembly compatibility.