VLZ24D-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ24D-GS08 is a Zener diode rated at 24.85 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 discontinuation from active production. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Substiute Parts

VLZ24D-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1175VLZ24D-GS08 Datasheet

Current PartRFQ

TLZ24D-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1157TLZ24D-GS08 Datasheet

DirectRFQ

BZV55-B24,115

Nexperia USA Inc.In Stock: 28007BZV55-B24,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLZ24D-GS08 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Zener voltage nominal rating within the 24 V to 24.85 V range
• Power dissipation capacity of 500 mW minimum
• Operating temperature range spanning -65°C to 175°C minimum
• Surface mount package configuration (SOD-80 or equivalent MiniMELF)
• Impedance characteristics suitable for the application circuit

Compliance & Certification Requirements:

• RoHS3 compliance
• Automotive grade qualification (AEC-Q101 preferred for automotive applications)
• Moisture sensitivity level MSL 1 (Unlimited)

Identified Substitute Parts:

1. TLZ24D-GS08 (Vishay General Semiconductor - Diodes Division): Direct series equivalent with 24 V nominal rating, 500 mW power rating, and identical impedance specification. Active product status with improved reverse leakage characteristics (40 nA vs. 40 µA). SOD-80 MiniMELF package.

2. BZV55-B24,115 (Nexperia USA Inc.): Manufacturer-recommended alternative with 24 V nominal rating, 500 mW power rating, and extended operating temperature range to 200°C. Active product status with higher impedance (70 Ohms) and improved forward voltage characteristics. LLDS MiniMELF package configuration.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TLZ24D-GS08

The TLZ24D-GS08 is the direct equivalent within the Vishay product family. It maintains identical electrical specifications for power dissipation (500 mW), impedance (35 Ohms), and operating temperature range (-65°C to 175°C). The TLZ24D-GS08 is an active product with superior reverse leakage performance (40 nA versus 40 µA), providing enhanced reliability. Both parts share RoHS3 compliance and MSL 1 rating. The nominal voltage difference of 0.85 V (24.85 V to 24 V) is within typical circuit tolerance margins for Zener diode applications. This part is recommended for direct replacement in existing designs.

Secondary Substitute: BZV55-B24,115

The BZV55-B24,115 is the manufacturer-recommended alternative from Nexperia. It meets the core electrical requirements with 24 V nominal rating and 500 mW power dissipation. This part offers an extended operating temperature range to 200°C, providing additional thermal margin for demanding applications. The BZV55-B24,115 includes ±2% voltage tolerance specification and improved forward voltage characteristics. The impedance specification of 70 Ohms is higher than the original part; circuit validation is necessary if impedance-dependent performance is critical. This part is suitable for applications requiring enhanced temperature performance or when Nexperia supply chain preference is established.

Compliance Considerations:

Both substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. The TLZ24D-GS08 retains automotive-grade qualification consistent with the original VLZ24D-GS08. The BZV55-B24,115 does not specify automotive qualification; verification against application requirements is necessary for automotive-grade designs.

Frequently Asked Questions (FAQ)

Q: Can the TLZ24D-GS08 directly replace the VLZ24D-GS08 in all applications?

A: The TLZ24D-GS08 is electrically compatible for most applications. The nominal Zener voltage differs by 0.85 V (24 V versus 24.85 V). Circuit designs with tight voltage regulation requirements should evaluate this difference. Both parts share identical power ratings, impedance, and operating temperature ranges. Package compatibility requires verification of PCB layout, as QuadroMELF and MiniMELF variants have different physical dimensions.

Q: What is the significance of the reverse leakage current difference between VLZ24D-GS08 and TLZ24D-GS08?

A: The VLZ24D-GS08 specifies 40 µA reverse leakage at 22.4 V, while the TLZ24D-GS08 specifies 40 nA at the same voltage. The TLZ24D-GS08 exhibits 1000 times lower reverse leakage, indicating superior device quality and reduced standby current consumption. This improvement is typical of newer manufacturing processes and does not create compatibility issues.

Q: Is the BZV55-B24,115 suitable for automotive applications?

A: The BZV55-B24,115 does not specify AEC-Q101 automotive qualification. The original VLZ24D-GS08 carries automotive-grade designation. For applications requiring automotive qualification, the TLZ24D-GS08 is the preferred substitute. The BZV55-B24,115 is suitable for industrial and commercial applications within its specified operating parameters.

Q: How does the impedance difference between TLZ24D-GS08 (35 Ohms) and BZV55-B24,115 (70 Ohms) affect circuit performance?

A: Impedance affects the dynamic response of the Zener diode to transient voltage changes. Higher impedance (70 Ohms) results in slower response to load transients. For applications with stringent transient suppression requirements, the lower impedance of TLZ24D-GS08 (35 Ohms) is preferred. For general voltage regulation and overvoltage protection, both impedance values are acceptable. Circuit simulation or testing is recommended for noise-sensitive applications.

Q: What are the package compatibility considerations?

A: The VLZ24D-GS08 uses SOD-80 QuadroMELF packaging, while TLZ24D-GS08 uses SOD-80 MiniMELF, and BZV55-B24,115 uses LLDS MiniMELF. These are physically different packages with different lead spacing and dimensions. PCB footprint redesign is required when switching between QuadroMELF and MiniMELF variants. Verify component placement and solder pad geometry before implementing substitution.

Q: Are all three parts RoHS3 compliant?

A: Yes. The VLZ24D-GS08, TLZ24D-GS08, and BZV55-B24,115 are all ROHS3 compliant. All three parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.

Q: What is the impact of the extended temperature range in BZV55-B24,115 (-65°C to 200°C)?

A: The BZV55-B24,115 operates to 200°C maximum, compared to 175°C for the VLZ24D-GS08 and TLZ24D-GS08. This 25°C additional margin provides thermal headroom for high-temperature applications. For standard industrial temperature ranges (-40°C to 85°C or -55°C to 125°C), this difference is not operationally significant. The extended range is beneficial for applications in thermal management systems or high-ambient-temperature environments.