MMBZ5237B_D87Z Equivalent & Substitute Parts

Part Overview

The MMBZ5237B_D87Z is a Zener diode rated at 8.2 V nominal voltage with 350 mW maximum power dissipation in a SOT-23-3 surface mount package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Suitable alternatives maintain the core electrical specifications while offering improved availability and active product support.

Substiute Parts

MMBZ5237B_D87Z

onsemiIn Stock: 1010MMBZ5237B_D87Z Datasheet

Current PartRFQ

MMBZ5237BLT1G

onsemiIn Stock: 50239MMBZ5237BLT1G Datasheet

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SZMMBZ5237BLT1G

onsemiIn Stock: 35390SZMMBZ5237BLT1G Datasheet

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MMBZ5237B-7-F

Diodes IncorporatedIn Stock: 23466MMBZ5237B-7-F Datasheet

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MMBZ5237BQ-13-F

Diodes IncorporatedIn Stock: 1100MMBZ5237BQ-13-F Datasheet

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MMBZ5237BQ-7-F

Diodes IncorporatedIn Stock: 1806MMBZ5237BQ-7-F Datasheet

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BZX84-A8V2,215

Nexperia USA Inc.In Stock: 8146BZX84-A8V2,215 Datasheet

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BZX84C8V2-7-F

Diodes IncorporatedIn Stock: 62490BZX84C8V2-7-F Datasheet

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BZX84C8V2-TP

Micro Commercial CoIn Stock: 9468BZX84C8V2-TP Datasheet

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CZRT5237B-G

Comchip TechnologyIn Stock: 740CZRT5237B-G Datasheet

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CZRT55C8V2-G

Comchip TechnologyIn Stock: 928CZRT55C8V2-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ5237B_D87Z is determined by the following critical parameters:

Primary Matching Criteria:

• Zener voltage: 8.2 V nominal
• Package type: SOT-23-3 (TO-236-3, SC-59)
• Mounting type: Surface Mount
• Tolerance: ±5% or tighter

Secondary Compatibility Factors:

• Power dissipation rating: 350 mW or higher
• Impedance (Max): 8 Ohms or lower
• Reverse leakage current: 3 µA @ 6.5 V or lower
• Forward voltage: 900 mV @ 10 mA or lower
• Operating temperature range: Must encompass -55°C to 150°C minimum

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Equivalents (Same Electrical Specifications): Parts with identical zener voltage, tolerance, power rating, impedance, and temperature range from active manufacturers.

Similar Parts (Minor Parameter Variations): Parts with the same zener voltage and package but differing in power rating, impedance, or tolerance. These are suitable when the application does not require the full 350 mW rating or can tolerate different impedance characteristics.

Upgraded Parts (Enhanced Specifications): Parts with identical or superior electrical specifications and active product status, including automotive-grade variants with AEC-Q101 qualification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The MMBZ5237B-7-F (Diodes Incorporated), MMBZ5237BQ-13-F, and MMBZ5237BQ-7-F (both Diodes Incorporated) provide exact electrical equivalence to the MMBZ5237B_D87Z. All three maintain 8.2 V nominal voltage, ±5% tolerance, 350 mW power rating, 8 Ohms maximum impedance, and SOT-23-3 packaging. These parts are active products with ROHS3 compliance and extended operating temperature range (-65°C to 150°C). The MMBZ5237BQ variants include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

For Applications with Reduced Power Requirements:

The MMBZ5237BLT1G and SZMMBZ5237BLT1G (both onsemi) are suitable when the application circuit dissipates less than 225 mW. Both maintain the 8.2 V specification, ±5% tolerance, 8 Ohms impedance, and SOT-23-3 package. The SZMMBZ5237BLT1G includes AEC-Q101 automotive qualification. These parts offer extended lower temperature limit (-65°C versus -55°C).

For Applications Tolerating Higher Impedance:

The BZX84C8V2-7-F (Diodes Incorporated) and BZX84C8V2-TP (Micro Commercial Co) provide 8.2 V zener voltage with 300 mW and 350 mW power ratings respectively, but feature 15 Ohms maximum impedance. The BZX84-A8V2,215 (Nexperia USA Inc.) offers tighter ±1% tolerance with 250 mW power and 15 Ohms impedance, including AEC-Q101 automotive qualification.

For Comchip Technology Sourcing:

The CZRT5237B-G provides 8.2 V, ±5% tolerance, 300 mW power, and 8 Ohms impedance in SOT-23-3 package. The CZRT55C8V2-G offers 350 mW power with 15 Ohms impedance and ±6% tolerance.

All recommended substitutes are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5237BLT1G replace MMBZ5237B_D87Z in all applications?

A: The MMBZ5237BLT1G is electrically compatible for zener voltage and impedance characteristics but has a lower power rating (225 mW versus 350 mW). It is suitable only for applications where the circuit dissipates 225 mW or less. Verify the actual power dissipation in your circuit before substitution.

Q: What is the difference between MMBZ5237BQ-7-F and MMBZ5237B-7-F?

A: Both parts are manufactured by Diodes Incorporated and provide identical electrical specifications: 8.2 V, ±5% tolerance, 350 mW power, 8 Ohms impedance, and SOT-23-3 package. The MMBZ5237BQ-7-F includes AEC-Q101 automotive qualification. Select the BQ variant for automotive applications requiring this certification.

Q: Why do some substitutes have 15 Ohms impedance instead of 8 Ohms?

A: Impedance (Zzt) is a dynamic characteristic affecting voltage regulation under load changes. Parts with 15 Ohms impedance exhibit slightly different voltage regulation behavior compared to 8 Ohms parts. For applications sensitive to voltage regulation performance, select substitutes with matching 8 Ohms impedance. For general-purpose zener applications, 15 Ohms impedance is acceptable.

Q: Are all substitute parts available in the same packaging?

A: All listed substitutes use SOT-23-3 (also designated TO-236-3 or SC-59) surface mount package. Packaging format differs by supplier: some offer Tape & Reel (TR), others offer Cut Tape (CT) with Digi-Reel. Verify packaging format availability with your supplier for production requirements.

Q: Can I use BZX84-A8V2,215 as a direct replacement?

A: The BZX84-A8V2,215 maintains 8.2 V zener voltage and SOT-23-3 package but differs in three parameters: ±1% tolerance (tighter than ±5%), 250 mW power (lower than 350 mW), and 15 Ohms impedance (higher than 8 Ohms). It is suitable for applications where tighter voltage tolerance is beneficial and power dissipation does not exceed 250 mW.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard. Parts bearing this qualification (MMBZ5237BQ variants, SZMMBZ5237BLT1G, BZX84-A8V2,215) have undergone additional reliability testing and are approved for automotive applications. Select AEC-Q101 qualified parts for automotive or mission-critical applications.

Q: Is the extended temperature range (-65°C to 150°C) important for my application?

A: The original MMBZ5237B_D87Z operates from -55°C to 150°C. Most active substitutes extend the lower limit to -65°C, providing additional margin for cold environment operation. If your application operates above -55°C, this difference is not significant. For applications requiring operation below -55°C, the extended range is beneficial.

Q: Can I substitute CZRT5237B-G for MMBZ5237B_D87Z?

A: The CZRT5237B-G is compatible for zener voltage (8.2 V), tolerance (±5%), impedance (8 Ohms), and package (SOT-23-3), but has a lower power rating (300 mW versus 350 mW). It is suitable if circuit power dissipation does not exceed 300 mW. Verify actual power dissipation before substitution.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are ROHS3 compliant, ensuring regulatory compliance for new designs and production.