VLZ39B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ39B-GS18 is a Zener diode rated at 36.28 V nominal voltage with 500 mW power dissipation in a surface mount SOD-80 QuadroMELF package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

The VLZ39B-GS18 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production and field service requirements for applications utilizing this component.

Substiute Parts

VLZ39B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 1199VLZ39B-GS18 Datasheet

Current PartRFQ

TLZ39B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 922TLZ39B-GS18 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ39B-GS18 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Zener voltage rating within the application tolerance band
• Maximum power dissipation capacity of 500 mW or greater
• Impedance specification of 85 Ohms maximum
• Reverse leakage current specification
• Forward voltage characteristics at specified current
• Operating temperature range of -65°C to 175°C minimum

Mechanical and Compliance Criteria:

• Surface mount package configuration (SOD-80 family variants acceptable)
• ROHS3 compliance
• REACH compliance status
• Automotive grade qualification (AEC-Q101 preferred for automotive applications)
• Moisture sensitivity level MSL 1 or equivalent

The TLZ39B-GS18 qualifies as a direct substitute based on matching electrical specifications, identical power rating, compatible package family, and equivalent compliance certifications. The primary difference is the nominal Zener voltage of 39 V versus 36.28 V in the original part, which represents a voltage selection within the same product series for applications requiring this specific voltage rating.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The TLZ39B-GS18 is available as an active product from the same manufacturer with identical electrical performance specifications and compliance certifications. This part maintains the same power rating, impedance, forward voltage characteristics, and operating temperature range as the VLZ39B-GS18.

Voltage Rating Consideration:

The TLZ39B-GS18 carries a nominal Zener voltage of 39 V compared to 36.28 V in the original part. Circuit designs must verify that this voltage differential is acceptable within the application's voltage regulation or protection requirements. The 39 V rating represents a standard voltage step within the Zener diode product family.

Package Variant:

The TLZ39B-GS18 is supplied in SOD-80 MiniMELF configuration, while the original part uses SOD-80 QuadroMELF. Both are surface mount SOD-80 family packages. Physical footprint and PCB layout compatibility must be confirmed for the specific application.

Compliance Status:

The TLZ39B-GS18 maintains ROHS3 and REACH compliance equivalent to the original part. Automotive grade and AEC-Q101 qualification status are not specified for the substitute part; applications requiring automotive qualification should verify this requirement with the manufacturer.

Supply Availability:

The TLZ39B-GS18 is currently in active production status with documented inventory availability, providing supply chain continuity for the obsolete VLZ39B-GS18.

Frequently Asked Questions (FAQ)

Q: Can the TLZ39B-GS18 be used as a direct replacement for the VLZ39B-GS18?

A: The TLZ39B-GS18 qualifies as a substitute based on matching electrical specifications, identical power dissipation, and equivalent compliance certifications. The primary design consideration is the nominal Zener voltage difference of 39 V versus 36.28 V. Circuit verification is required to confirm this voltage rating is acceptable for the application.

Q: What is the difference between SOD-80 QuadroMELF and SOD-80 MiniMELF packages?

A: Both are surface mount SOD-80 family packages. QuadroMELF and MiniMELF represent different physical form factors within the SOD-80 specification. PCB footprint compatibility and component placement must be verified for the specific application before substitution.

Q: Are there compliance differences between the VLZ39B-GS18 and TLZ39B-GS18?

A: Both parts are ROHS3 compliant and REACH unaffected with MSL 1 rating. The original part carries automotive grade designation and AEC-Q101 qualification. The substitute part does not specify these automotive qualifications. Applications requiring automotive certification should confirm qualification status with the manufacturer.

Q: Why is the reverse leakage current specification different between the two parts?

A: The VLZ39B-GS18 specifies 40 µA reverse leakage current, while the TLZ39B-GS18 specifies 40 nA. The TLZ39B-GS18 exhibits significantly lower reverse leakage. This represents an improvement in leakage performance and does not prevent substitution. Applications sensitive to leakage current will benefit from this specification.

Q: Is the TLZ39B-GS18 available in tape and reel packaging?

A: Yes, the TLZ39B-GS18 is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes.

Q: What is the base product number relationship?

A: The VLZ39B-GS18 belongs to the VLZ39 base product series, while the TLZ39B-GS18 belongs to the TLZ39 base product series. Both are Zener diode product lines from Vishay General Semiconductor - Diodes Division with compatible electrical characteristics.