VLZ20-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ20-GS18 is a Zener Diode rated at 20 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 or unavailable. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure project timelines are not compromised due to component availability constraints.

Substiute Parts

VLZ20-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 686VLZ20-GS18 Datasheet

Current PartRFQ

TLZ20-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 934TLZ20-GS18 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ20-GS18 is determined by strict equivalence across the following critical parameters:

• Zener Voltage: 20 V nominal
• Power Dissipation: 500 mW maximum
• Impedance: 28 Ohms maximum
• Forward Voltage: 1.5 V maximum at 200 mA
• Operating Temperature Range: -65°C to 175°C
• Surface Mount Configuration: SOD-80 package family
• Compliance Standards: ROHS3, REACH Unaffected, AEC-Q101 Automotive Grade

The substitute part TLZ20-GS18 meets all electrical specifications and compliance requirements. The primary distinction is the packaging variant within the SOD-80 family (MiniMELF versus QuadroMELF) and product status transition from Obsolete to Active, along with packaging format (Tape & Reel).

Parameter Comparison

Engineering Selection Recommendations

TLZ20-GS18 as Primary Substitute

The TLZ20-GS18 is the direct electrical equivalent to the VLZ20-GS18 and is recommended for new designs and component replenishment. Selection rationale:

• All electrical parameters are identical across zener voltage, power rating, impedance, and forward voltage specifications
• Operating temperature range is fully compatible
• Both components maintain ROHS3 compliance and REACH Unaffected status
• Both are qualified to AEC-Q101 automotive standards
• TLZ20-GS18 holds Active product status, ensuring long-term availability and supply chain stability
• SOD-80 package family compatibility ensures mechanical and thermal performance equivalence

Package Variant Consideration

The transition from SOD-80 QuadroMELF to SOD-80 MiniMELF represents a dimensional change within the same package family. Both variants are surface-mount compatible and maintain identical electrical performance. PCB layout and thermal management characteristics remain functionally equivalent for standard applications.

Compliance and Qualification

Both components satisfy automotive-grade requirements through AEC-Q101 qualification, making them suitable for applications requiring automotive-level reliability and traceability.

Frequently Asked Questions (FAQ)

Q: Can TLZ20-GS18 be used as a direct replacement for VLZ20-GS18 in existing designs?

A: Yes. The TLZ20-GS18 meets all electrical specifications of the VLZ20-GS18, including zener voltage, power dissipation, impedance, and operating temperature range. Both components are SOD-80 surface-mount packages and maintain identical electrical performance.

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

A: Both are SOD-80 package variants with identical electrical characteristics. The difference is dimensional: MiniMELF is a smaller form factor than QuadroMELF. Both are surface-mount compatible and suitable for standard PCB assembly processes.

Q: Why is VLZ20-GS18 marked as Obsolete?

A: Obsolete status indicates the component is no longer in active production. TLZ20-GS18, with Active product status, provides continuity of supply and is the recommended path forward for new procurement.

Q: Are there any compliance or certification differences between these parts?

A: No. Both VLZ20-GS18 and TLZ20-GS18 are ROHS3 compliant, REACH Unaffected, and AEC-Q101 qualified for automotive applications. Compliance profiles are identical.

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both components have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling procedures apply without special moisture control requirements.

Q: Can PCB layouts designed for VLZ20-GS18 be used with TLZ20-GS18 without modification?

A: PCB footprints must be verified for compatibility between SOD-80 QuadroMELF and SOD-80 MiniMELF variants. While both are SOD-80 family packages, dimensional differences may require footprint adjustment. Consult package datasheets for precise pin spacing and land pattern specifications.