VLZ27D-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ27D-GS18 is a Zener diode rated at 26.97 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the SOD-80 QuadroMELF package format and meets automotive-grade specifications under AEC-Q101 qualification.

The VLZ27D-GS18 is classified as an obsolete product. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

VLZ27D-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 779VLZ27D-GS18 Datasheet

Current PartRFQ

TLZ27D-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 933TLZ27D-GS18 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ27D-GS18 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Zener voltage nominal rating within the application tolerance band
• Maximum power dissipation capacity of 500 mW or greater
• Impedance specification of 45 Ohms maximum
• Reverse leakage current specification
• Forward voltage characteristics at specified current levels
• Operating temperature range of -65°C to 175°C minimum

Mechanical and Packaging Requirements:

• Surface mount mounting type
• SOD-80 package compatibility
• Automotive-grade classification
• AEC-Q101 qualification

Compliance Requirements:

• ROHS3 compliance
• REACH unaffected status
• Moisture sensitivity level 1 (unlimited)

The substitute part TLZ27D-GS18 meets all critical electrical parameters and maintains automotive-grade qualification with AEC-Q101 certification. The zener voltage nominal rating of 27 V represents a 0.03 V variance from the original 26.97 V specification, which falls within acceptable substitution tolerance for this component category. Both parts share identical power ratings, impedance specifications, and operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

The TLZ27D-GS18 is a direct substitute for the obsolete VLZ27D-GS18 based on the following engineering criteria:

Electrical Performance: Both components maintain identical power dissipation capacity, impedance specifications, and forward voltage characteristics. The zener voltage nominal rating differs by 0.03 V (26.97 V versus 27 V), which is within acceptable substitution parameters for this component class. The TLZ27D-GS18 demonstrates superior reverse leakage current performance at 40 nA compared to the original 40 µA specification.

Compliance and Certification: Both parts carry automotive-grade classification and AEC-Q101 qualification, ensuring suitability for automotive applications. ROHS3 compliance and REACH unaffected status are maintained across both components.

Product Availability: The TLZ27D-GS18 is classified as an active product with confirmed inventory availability (826 pieces), whereas the VLZ27D-GS18 is obsolete. Selection of the active substitute part ensures long-term supply chain continuity.

Package Compatibility: Both components utilize SOD-80 surface mount packages. The TLZ27D-GS18 employs the MiniMELF variant while the original uses QuadroMELF; both are compatible with standard SOD-80 footprints in surface mount applications.

Frequently Asked Questions (FAQ)

Q: What is the primary reason for substituting the VLZ27D-GS18?

A: The VLZ27D-GS18 is classified as an obsolete product. The TLZ27D-GS18 is an active equivalent that maintains all critical electrical specifications and automotive-grade certifications while providing improved availability and long-term supply chain support.

Q: Are the zener voltage ratings interchangeable between VLZ27D-GS18 and TLZ27D-GS18?

A: The nominal zener voltages are 26.97 V and 27 V respectively, representing a 0.03 V variance. This difference is within acceptable substitution tolerance for zener diode applications in this voltage class and does not affect functional compatibility in standard circuit designs.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the VLZ27D-GS18 and TLZ27D-GS18 are automotive-grade components with AEC-Q101 qualification, ensuring compliance with automotive industry standards and reliability requirements.

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

A: Both package variants conform to the SOD-80 standard and are compatible with standard SOD-80 surface mount footprints. The QuadroMELF and MiniMELF designations refer to internal package geometry variations that do not affect PCB-level compatibility or electrical performance.

Q: Is the reverse leakage current difference between the two parts significant?

A: The TLZ27D-GS18 exhibits reverse leakage current of 40 nA compared to 40 µA in the original part. This represents improved leakage performance in the substitute component, which is advantageous for applications requiring low standby current or high impedance characteristics.

Q: Are both parts RoHS compliant?

A: Yes. Both the VLZ27D-GS18 and TLZ27D-GS18 are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: Can the TLZ27D-GS18 be used as a direct drop-in replacement?

A: The TLZ27D-GS18 is electrically and mechanically compatible with the VLZ27D-GS18 across all critical parameters. Both components share identical power ratings, impedance specifications, operating temperature ranges, and automotive certifications, supporting direct substitution in applications designed for the original part.