VLZ39G-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ39G-GS08 is a Zener diode rated at 39.87 V nominal 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 VLZ39G-GS08 carries an Obsolete product status. Identification of equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this zener diode specification.

Substiute Parts

VLZ39G-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 993VLZ39G-GS08 Datasheet

Current PartRFQ

TLZ39G-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1570TLZ39G-GS08 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ39G-GS08 is determined by equivalence across the following critical parameters:

Electrical Specifications:

• Zener voltage nominal rating within the 39 V to 39.87 V range
• Maximum power dissipation of 500 mW
• Maximum impedance of 85 Ohms
• Operating temperature range of -65°C to 175°C
• Forward voltage maximum of 1.5 V at 200 mA

Mechanical & Package Specifications:

• Surface mount technology
• SOD-80 package family compatibility
• Automotive grade qualification
• AEC-Q101 certification

Compliance & Environmental:

• ROHS3 compliance
• REACH unaffected status
• Moisture Sensitivity Level 1 (Unlimited)

The substitute part TLZ39G-GS08 meets all critical electrical and mechanical parameters required for functional equivalence, with the exception of minor zener voltage tolerance variation (39 V nominal versus 39.87 V nominal) and reverse leakage current specification improvement (40 nA versus 40 µA).

Parameter Comparison

Engineering Selection Recommendations

TLZ39G-GS08 as Primary Substitute:

The TLZ39G-GS08 is the direct substitute for the obsolete VLZ39G-GS08. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical performance across power dissipation, impedance, forward voltage, and operating temperature specifications.

The TLZ39G-GS08 offers the following advantages:

• Active product status ensures ongoing availability and supply chain continuity
• Zener voltage nominal of 39 V is within acceptable tolerance of the original 39.87 V specification for most circuit applications
• Reverse leakage current specification of 40 nA at 37 V represents improved performance compared to the original 40 µA specification
• ROHS3 compliance and REACH unaffected status maintain regulatory alignment
• Moisture Sensitivity Level 1 (Unlimited) matches the original component

Package Consideration:

The TLZ39G-GS08 is supplied in SOD-80 MiniMELF package format, while the VLZ39G-GS08 uses SOD-80 QuadroMELF. Both are SOD-80 family packages suitable for surface mount applications. Physical footprint differences between MiniMELF and QuadroMELF variants require PCB layout verification prior to implementation.

Compliance Status:

The main part VLZ39G-GS08 carries explicit automotive grade and AEC-Q101 qualification designations. The substitute part TLZ39G-GS08 does not list these qualifications in the provided specifications. Applications requiring automotive qualification should confirm AEC-Q101 compliance status with the manufacturer prior to design release.

Frequently Asked Questions (FAQ)

Q: Can TLZ39G-GS08 directly replace VLZ39G-GS08 in existing designs?

A: The TLZ39G-GS08 is electrically equivalent across all critical parameters: 500 mW power rating, 85 Ohm maximum impedance, 1.5 V forward voltage at 200 mA, and -65°C to 175°C operating range. The zener voltage nominal differs by 0.87 V (39 V versus 39.87 V), which is acceptable for most applications. Physical package differences (MiniMELF versus QuadroMELF) require PCB footprint verification.

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

A: Both are SOD-80 family surface mount packages for zener diodes. QuadroMELF and MiniMELF variants differ in physical dimensions and lead configuration. PCB layout and reflow profile compatibility must be confirmed before substitution.

Q: Why does the substitute part show improved reverse leakage current (40 nA versus 40 µA)?

A: The TLZ39G-GS08 specifies reverse leakage current of 40 nanoamperes at 37 V, compared to 40 microamperes for the VLZ39G-GS08. This represents a 1000-fold improvement in leakage performance and indicates enhanced device quality. This improvement is compatible with the original design requirements.

Q: Is the TLZ39G-GS08 suitable for automotive applications?

A: The TLZ39G-GS08 is manufactured by Vishay and shares the same product family as the original automotive-qualified VLZ39G-GS08. However, the provided specifications do not explicitly list AEC-Q101 qualification for the substitute part. Automotive applications should confirm qualification status with the manufacturer.

Q: What is the inventory status of these parts?

A: The VLZ39G-GS08 (obsolete) has 971 pieces in stock. The TLZ39G-GS08 (active) has 1480 pieces in stock, providing superior supply chain availability.

Q: Are both parts ROHS3 compliant?

A: Yes. Both VLZ39G-GS08 and TLZ39G-GS08 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.