VLZ56-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ56-GS08 is a Zener diode rated at 56.5 V nominal voltage 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. The part carries AEC-Q101 automotive qualification and is ROHS3 compliant. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure supply chain availability for applications requiring this voltage and power rating.

Substiute Parts

VLZ56-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 889VLZ56-GS08 Datasheet

Current PartRFQ

TLZ56-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 120268TLZ56-GS08 Datasheet

DirectRFQ

BZV55-B56,115

Nexperia USA Inc.In Stock: 3481BZV55-B56,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ56-GS08 is determined by the following critical parameters:

Zener Voltage Compatibility: Substitute parts must operate at nominal Zener voltages within the functional range of 56 V to 56.5 V. This voltage specification is fundamental to circuit operation and cannot be significantly deviated.

Power Dissipation Rating: All substitute parts must maintain the 500 mW power rating to ensure thermal performance and reliability under specified operating conditions.

Package and Mounting: Substitute parts must be surface mount devices compatible with SOD-80 package family specifications, including MiniMELF and LLDS variants, to ensure mechanical and electrical compatibility with existing PCB layouts.

Impedance Characteristics: Maximum impedance specifications (100 Ohms to 200 Ohms) determine dynamic response and must be evaluated for circuit-specific requirements.

Reverse Leakage Current: Leakage specifications range from 40 nA to 50 nA at specified reverse voltages and directly impact circuit performance in high-impedance applications.

Operating Temperature Range: Substitute parts must support the -65°C to 175°C operating range, with extended range options available up to 200°C.

Compliance and Qualification: All substitute parts maintain ROHS3 compliance, AEC-Q101 automotive qualification (where applicable), and equivalent regulatory status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TLZ56-GS08

The TLZ56-GS08 is the direct equivalent from Vishay General Semiconductor - Diodes Division. This part maintains identical electrical specifications (56 V nominal, 500 mW power rating, 100 Ohms maximum impedance) and operating temperature range (-65°C to 175°C). The primary difference is the package variant: TLZ56-GS08 uses SOD-80 MiniMELF configuration compared to the QuadroMELF variant of the VLZ56-GS08. Both packages are SOD-80 family compatible. The TLZ56-GS08 is currently in Active product status with substantial inventory availability (120,180 pieces), ensuring supply chain continuity. This part is recommended as the first choice for direct replacement.

Secondary Substitute: BZV55-B56,115

The BZV55-B56,115 manufactured by Nexperia USA Inc. provides an alternative from a different manufacturer. This part meets the core functional requirements: 56 V nominal Zener voltage, 500 mW power rating, and surface mount SOD-80 LLDS MiniMELF package. The BZV55-B56,115 offers extended operating temperature range (-65°C to 200°C) and includes ±2% voltage tolerance specification. Notable differences include higher maximum impedance (200 Ohms versus 100 Ohms) and lower reverse leakage current (50 nA at 39.2 V). The part is currently in Active product status with adequate inventory (3,444 pieces). Selection of this substitute requires evaluation of impedance tolerance and leakage current specifications for the specific application circuit.

Both substitute parts maintain ROHS3 compliance and equivalent regulatory status. Selection between TLZ56-GS08 and BZV55-B56,115 depends on package footprint compatibility, impedance requirements, and leakage current specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the TLZ56-GS08 directly replace the VLZ56-GS08 on existing PCBs?

A: The TLZ56-GS08 uses SOD-80 MiniMELF packaging while the VLZ56-GS08 uses SOD-80 QuadroMELF packaging. Both are SOD-80 family variants with compatible electrical specifications. Physical footprint compatibility must be verified against the PCB design. If the PCB footprint accommodates MiniMELF dimensions, direct substitution is electrically valid.

Q: What is the significance of the reverse leakage current difference between VLZ56-GS08 (40 µA) and TLZ56-GS08 (40 nA)?

A: The VLZ56-GS08 specification lists 40 µA reverse leakage current, while the TLZ56-GS08 lists 40 nA. This three-order-of-magnitude difference represents a significant improvement in leakage performance. For high-impedance circuit applications, the TLZ56-GS08 provides superior performance. For standard applications, both specifications are acceptable.

Q: Is the BZV55-B56,115 suitable for automotive applications?

A: The BZV55-B56,115 is manufactured by Nexperia and maintains ROHS3 compliance. The original VLZ56-GS08 carries AEC-Q101 automotive qualification. The BZV55-B56,115 specifications do not explicitly reference AEC-Q101 qualification in the provided data. Automotive application suitability requires verification of Nexperia's qualification status for this specific part number.

Q: What is the impact of the 200 Ohms maximum impedance specification in the BZV55-B56,115 compared to 100 Ohms in the VLZ56-GS08?

A: Impedance affects the dynamic response and voltage regulation characteristics of the Zener diode. The BZV55-B56,115 with 200 Ohms maximum impedance exhibits higher dynamic impedance than the VLZ56-GS08 with 100 Ohms. This difference impacts transient response and voltage stability. Circuit-specific requirements determine whether the higher impedance is acceptable.

Q: Can both substitute parts operate at the extended temperature range of 200°C?

A: The TLZ56-GS08 operates from -65°C to 175°C, matching the original VLZ56-GS08 specification. The BZV55-B56,115 extends the upper operating temperature to 200°C. If the application requires operation above 175°C, only the BZV55-B56,115 is suitable. For standard operating ranges up to 175°C, both substitutes are valid.

Q: Are there any moisture sensitivity considerations for these parts?

A: All three parts (VLZ56-GS08, TLZ56-GS08, and BZV55-B56,115) carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special moisture control requirements.