VLZ2V7B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ2V7B-GS18 is a Zener diode rated at 2.8 V nominal with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring 2.8 V Zener regulation.

Substiute Parts

VLZ2V7B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 916VLZ2V7B-GS18 Datasheet

Current PartRFQ

TLZ2V7B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 808TLZ2V7B-GS18 Datasheet

DirectRFQ

1N4618UR-1

Microchip TechnologyIn Stock: 11371N4618UR-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ2V7B-GS18 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage nominal rating within the application tolerance band
• Power dissipation capacity of 500 mW or greater
• Surface mount mounting type
• Operating temperature range of -65°C to 175°C or broader
• Reverse leakage current specification
• Forward voltage characteristics

Substitute Classification:

Direct Equivalent (TLZ2V7B-GS18): This Vishay part maintains identical electrical specifications (2.7 V nominal Zener voltage, 500 mW power, 100 Ohms impedance, 50 µA reverse leakage) with equivalent thermal and electrical performance. The primary difference is the package variant (SOD-80 MiniMELF versus SOD-80 QuadroMELF), which affects physical footprint but not electrical function. This part is active status, ensuring continued availability.

Functional Equivalent (1N4618UR-1): This Microchip Technology part provides 2.7 V Zener regulation at 500 mW power dissipation with equivalent operating temperature range. Electrical differences include higher impedance (1500 Ohms versus 100 Ohms), lower reverse leakage (500 nA versus 50 µA), and lower forward voltage (1.1 V versus 1.5 V). The package is DO-213AA (Glass) rather than SOD-80, requiring PCB layout modification. This part is active status.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The TLZ2V7B-GS18 is the primary substitute for the VLZ2V7B-GS18. Both parts are manufactured by Vishay General Semiconductor and maintain identical electrical specifications (500 mW power, 100 Ohms impedance, 50 µA reverse leakage, 1.5 V forward voltage). The TLZ2V7B-GS18 is active status, ensuring long-term supply availability. The package difference (MiniMELF versus QuadroMELF) requires PCB footprint verification but does not affect electrical performance. Both parts are ROHS3 compliant and suitable for automotive applications.

For Alternative Substitution (When Direct Replacement Unavailable):

The 1N4618UR-1 from Microchip Technology provides functional equivalence with 2.7 V Zener regulation and 500 mW power dissipation. This part is active status and maintains the required operating temperature range. However, electrical parameter differences exist: impedance is significantly higher (1500 Ohms), reverse leakage is lower (500 nA), and forward voltage is lower (1.1 V). The DO-213AA package requires PCB layout modification from the original SOD-80 footprint. Circuit performance validation is necessary to confirm suitability for the specific application, particularly regarding impedance effects on regulation characteristics.

Compliance Considerations:

Both substitute parts maintain ROHS3 compliance and REACH unaffected status consistent with the original part. The TLZ2V7B-GS18 retains automotive grade qualification (AEC-Q101), while the 1N4618UR-1 does not specify automotive qualification. For automotive applications, the TLZ2V7B-GS18 is the recommended substitute.

Frequently Asked Questions (FAQ)

Q: Can the TLZ2V7B-GS18 be used as a direct replacement for the VLZ2V7B-GS18?

A: The TLZ2V7B-GS18 is electrically equivalent to the VLZ2V7B-GS18, with identical power rating (500 mW), impedance (100 Ohms), reverse leakage (50 µA), and forward voltage characteristics. The primary difference is the package variant: TLZ2V7B-GS18 uses SOD-80 MiniMELF while VLZ2V7B-GS18 uses SOD-80 QuadroMELF. PCB footprint verification is required before implementation.

Q: What is the voltage difference between the VLZ2V7B-GS18 (2.8 V) and substitute parts (2.7 V)?

A: The VLZ2V7B-GS18 has a nominal Zener voltage of 2.8 V, while both substitute parts (TLZ2V7B-GS18 and 1N4618UR-1) are rated at 2.7 V nominal. This 0.1 V difference must be evaluated against circuit tolerance requirements. The 1N4618UR-1 includes ±5% tolerance specification, providing defined voltage accuracy.

Q: Why does the 1N4618UR-1 have higher impedance (1500 Ohms) compared to the original part (100 Ohms)?

A: Impedance differences reflect different semiconductor designs and manufacturing processes between Microchip and Vishay. Higher impedance affects voltage regulation characteristics under load changes. Circuit analysis is necessary to determine if this parameter difference is acceptable for the specific application.

Q: Is the 1N4618UR-1 suitable for automotive applications?

A: The 1N4618UR-1 does not specify automotive grade qualification or AEC-Q101 certification. For automotive applications, the TLZ2V7B-GS18 is the appropriate substitute, as it maintains automotive grade status and AEC-Q101 qualification consistent with the original VLZ2V7B-GS18.

Q: What packaging changes occur with each substitute part?

A: The TLZ2V7B-GS18 uses SOD-80 MiniMELF packaging, which differs from the original SOD-80 QuadroMELF but maintains the same general SOD-80 family. The 1N4618UR-1 uses DO-213AA (Glass) packaging, which is a different package family requiring PCB layout redesign. Mechanical compatibility with existing PCB designs must be verified for each substitute.

Q: Are all substitute parts RoHS compliant?

A: The TLZ2V7B-GS18 is ROHS3 compliant, matching the original part. The 1N4618UR-1 does not specify RoHS status in the provided data. Compliance verification with the component supplier is recommended before procurement.

Q: What is the product status of each part, and how does this affect availability?

A: The VLZ2V7B-GS18 is obsolete, indicating limited or discontinued availability. The TLZ2V7B-GS18 and 1N4618UR-1 are both active status parts, ensuring continued manufacturing and supply chain support. Active status parts are recommended for new designs and ongoing production.