VLZ18-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ18-GS08 is a Zener Diode rated at 18 V with 500 mW power dissipation in a Surface Mount SOD-80 QuadroMELF package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as Obsolete, indicating that direct procurement from original manufacturing channels may be limited. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Substiute Parts

VLZ18-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1080VLZ18-GS08 Datasheet

Current PartRFQ

TLZ18-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 960TLZ18-GS08 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ18-GS08 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Zener voltage rating: 18 V nominal
• Maximum power dissipation: 500 mW
• Maximum impedance: 23 Ohms
• Forward voltage: 1.5 V maximum at 200 mA
• Operating temperature range: -65°C to 175°C

Mechanical and Compliance Criteria:

• Surface Mount mounting type
• SOD-80 package family compatibility
• Automotive grade qualification (AEC-Q101)
• ROHS3 compliance
• Moisture Sensitivity Level 1

The substitute part TLZ18-GS08 meets all electrical parameters identically and maintains automotive-grade qualification with AEC-Q101 certification. The primary distinction is the package variant designation (MiniMELF versus QuadroMELF) and the active product status of the substitute, which ensures ongoing availability and supply chain support.

Parameter Comparison

Engineering Selection Recommendations

The TLZ18-GS08 is a direct electrical and functional equivalent to the VLZ18-GS08. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications, automotive-grade qualification (AEC-Q101), and regulatory compliance (ROHS3, REACH Unaffected).

The primary advantage of selecting TLZ18-GS08 is its Active product status, which ensures continued availability, supply chain support, and manufacturing consistency. The VLZ18-GS08, classified as Obsolete, presents supply constraints and potential discontinuation risks.

Both parts are packaged in the SOD-80 family with compatible mechanical footprints suitable for Surface Mount assembly. The package variant designation (MiniMELF for TLZ18-GS08 versus QuadroMELF for VLZ18-GS08) reflects internal construction differences that do not affect electrical performance or external mechanical compatibility for standard PCB applications.

For new designs or production continuity, TLZ18-GS08 is the recommended selection. For existing designs currently utilizing VLZ18-GS08, substitution with TLZ18-GS08 is electrically and mechanically valid without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Are the VLZ18-GS08 and TLZ18-GS08 electrically interchangeable?

A: Yes. Both components have identical Zener voltage (18 V), power rating (500 mW), impedance (23 Ohms maximum), forward voltage (1.5 V @ 200 mA), and operating temperature range (-65°C to 175°C). Electrical performance is equivalent.

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

A: Both are SOD-80 package variants within the same family. The QuadroMELF and MiniMELF designations refer to internal construction and lead configuration. Both are Surface Mount packages with compatible PCB footprints for standard applications. Physical dimensions and soldering characteristics are within acceptable tolerances for automated assembly processes.

Q: Why is the VLZ18-GS08 listed as Obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support for this part number. This classification necessitates identification of active equivalent parts to ensure supply chain continuity and long-term availability.

Q: Can I use TLZ18-GS08 in a design currently specified for VLZ18-GS08?

A: Yes. The TLZ18-GS08 meets all electrical and mechanical requirements of the VLZ18-GS08. No circuit modifications are required. Both parts carry identical automotive-grade qualification (AEC-Q101) and regulatory compliance certifications.

Q: What is the inventory status of these parts?

A: VLZ18-GS08 has 977 pieces in stock (Obsolete status). TLZ18-GS08 has 904 pieces in stock (Active status). The Active status of TLZ18-GS08 provides assurance of continued availability and replenishment capability.

Q: Are both parts RoHS compliant?

A: Yes. Both VLZ18-GS08 and TLZ18-GS08 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the Moisture Sensitivity Level for these Zener diodes?

A: Both components have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage, handling, or assembly processes.