FLZ36VB Equivalent & Substitute Parts

Part Overview

The FLZ36VB is a Zener diode manufactured by onsemi, rated at 33.6 V nominal voltage with 500 mW power dissipation in a surface mount SOD-80 (DO-213AC, MINI-MELF) package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Active equivalent devices are available from alternative manufacturers that maintain compatibility with the original electrical and mechanical specifications.

Substiute Parts

FLZ36VB

onsemiIn Stock: 10486FLZ36VB Datasheet

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BZV55-B33,115

NXP SemiconductorsIn Stock: 208489BZV55-B33,115 Datasheet

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TZM5258B-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 32611TZM5258B-GS08 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FLZ36VB are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Nominal Zener voltage within acceptable circuit tolerance (33 V to 36 V range)
• Power dissipation rating of 500 mW
• Surface mount package compatibility (SOD-80, DO-213AC, MINI-MELF)
• Operating temperature range encompassing or exceeding -65°C to 175°C
• Moisture sensitivity level of 1 (Unlimited)

Secondary Compatibility Factors:

• Impedance characteristics (Zzt) within acceptable deviation
• Reverse leakage current specifications
• Forward voltage characteristics
• REACH and RoHS compliance status

The identified substitute parts maintain electrical functionality within the design parameters of circuits originally specified for the FLZ36VB, with variations in tolerance and impedance that remain within acceptable engineering margins for typical Zener diode applications.

Parameter Comparison

Engineering Selection Recommendations

BZV55-B33,115 (NXP Semiconductors): This part is recommended as the primary substitute for the FLZ36VB. The BZV55-B33,115 maintains 500 mW power rating and SOD-80 package compatibility. The nominal Zener voltage of 33 V represents a 0.6 V deviation from the original 33.6 V specification, which falls within typical circuit tolerance margins. The ±2% tolerance provides tighter voltage regulation compared to the original ±3% specification. The extended operating temperature range to 200°C exceeds the original specification. Product status is active with full REACH compliance, ensuring long-term availability and regulatory compliance.

TZM5258B-GS08 (Vishay General Semiconductor - Diodes Division): This part serves as an alternative substitute with identical 500 mW power rating and SOD-80 package compatibility. The nominal Zener voltage of 36 V represents a 2.4 V deviation from the original specification. The ±5% tolerance is wider than the original ±3%, which may require circuit evaluation depending on voltage regulation requirements. The impedance of 70 Ohms is closer to the original 63 Ohms compared to the NXP alternative. Product status is active with RoHS3 compliance and REACH unaffected status. This part is available in Tape & Reel packaging for production quantities.

Both substitute parts maintain full compatibility with the original SOD-80 surface mount package and moisture sensitivity classification. Selection between alternatives depends on specific circuit voltage tolerance requirements and thermal operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B33,115 directly replace the FLZ36VB without circuit modification?

A: The BZV55-B33,115 is electrically compatible for most applications. The 0.6 V nominal voltage difference (33 V vs. 33.6 V) and improved ±2% tolerance typically require no circuit changes. However, circuits with strict voltage regulation requirements should be evaluated against the specific application tolerance band.

Q: What is the voltage difference impact between the FLZ36VB (33.6 V) and TZM5258B-GS08 (36 V)?

A: The 2.4 V difference represents approximately 7% deviation from the original specification. This substitution is suitable for applications with broader voltage tolerance bands. Circuits requiring precise voltage regulation within ±3% of 33.6 V should prioritize the BZV55-B33,115 alternative.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use identical surface mount packages: DO-213AC, MINI-MELF, SOD-80. PCB footprints and land patterns are directly compatible without modification.

Q: What is the significance of the impedance differences among the three parts?

A: Impedance (Zzt) affects dynamic voltage regulation characteristics. The FLZ36VB specifies 63 Ohms maximum impedance. The BZV55-B33,115 (80 Ohms) and TZM5258B-GS08 (70 Ohms) show higher impedance values, which may result in slightly increased voltage ripple in high-frequency applications. For most standard Zener diode applications, these differences are within acceptable operating margins.

Q: Does the extended temperature range of the BZV55-B33,115 (-65 to 200°C) provide any advantage?

A: The extended upper temperature limit of 200°C (versus 175°C for the original and Vishay part) provides additional thermal margin for applications operating in elevated ambient conditions or with high power dissipation. This specification does not negatively impact applications operating within the original -65 to 175°C range.

Q: Are there any compliance or regulatory differences between the substitute parts?

A: All three parts maintain REACH Unaffected status. The TZM5258B-GS08 additionally carries RoHS3 compliance certification. All parts have Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: What packaging formats are available for production quantities?

A: The FLZ36VB and TZM5258B-GS08 are available in Tape & Reel format suitable for automated assembly. The BZV55-B33,115 is supplied in Bulk packaging. Packaging selection depends on production volume and assembly equipment compatibility.