VLZ30D-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ30D-GS18 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 29.77 V nominal Zener voltage with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, making substitutes critical for applications requiring maintained compliance standards.

Substiute Parts

VLZ30D-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 799VLZ30D-GS18 Datasheet

Current PartRFQ

TLZ30D-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 953TLZ30D-GS18 Datasheet

DirectRFQ

1N5545BUR-1

Microchip TechnologyIn Stock: 10021N5545BUR-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VLZ30D-GS18 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage nominal rating within the operating specification range
• Power dissipation capacity of 500 mW minimum
• Surface mount package configuration
• Operating temperature range of -65°C to 175°C
• Compliance with automotive and RoHS requirements where applicable

Substitute Classification:

Direct Manufacturer Substitute (Vishay Series): TLZ30D-GS18 represents a direct alternative from the same manufacturer, utilizing an updated MiniMELF package variant (SOD-80) with improved electrical characteristics. This substitute maintains the same power rating and operating temperature envelope while offering enhanced performance metrics.

Cross-Manufacturer Substitute (Microchip Technology): 1N5545BUR-1 provides functional equivalence through matching Zener voltage (30 V nominal), power rating (500 mW), and surface mount configuration. This substitute operates within the same temperature range and maintains electrical compatibility for circuit-level substitution, though package geometry differs (DO-213AA versus QuadroMELF).

Parameter Comparison

Engineering Selection Recommendations

TLZ30D-GS18 Selection Criteria:

The TLZ30D-GS18 is the preferred direct substitute for the VLZ30D-GS18 based on manufacturer continuity, active product status, and ROHS3 compliance. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical power ratings and operating temperature ranges. The TLZ30D-GS18 demonstrates superior reverse leakage characteristics (40 nA versus 40 µA), indicating improved performance in low-current applications. Package geometry differs between QuadroMELF and MiniMELF variants; PCB layout modifications may be required. This substitute is suitable for applications where automotive qualification is not mandatory but RoHS compliance is required.

1N5545BUR-1 Selection Criteria:

The 1N5545BUR-1 provides functional equivalence for applications where cross-manufacturer sourcing is acceptable. This Microchip Technology component matches the 30 V Zener voltage and 500 mW power rating, with superior reverse leakage performance (10 nA) and lower forward voltage drop (1.1 V). However, this substitute carries RoHS non-compliant status, restricting its use in applications with mandatory RoHS requirements. The DO-213AA package differs from both Vishay variants, requiring PCB redesign. This substitute is applicable only when RoHS compliance is not a design constraint.

Compliance Considerations:

Applications requiring AEC-Q101 automotive qualification should prioritize the TLZ30D-GS18, as the main part's automotive-grade designation is not confirmed for cross-manufacturer alternatives. Applications with mandatory RoHS compliance must exclude the 1N5545BUR-1 from consideration.

Frequently Asked Questions (FAQ)

Q: Can the TLZ30D-GS18 be used as a direct replacement for the VLZ30D-GS18 without circuit modification?

A: The TLZ30D-GS18 is electrically compatible at the circuit level, as both components share identical Zener voltage nominal range (29.77 V to 30 V), power dissipation (500 mW), and operating temperature specifications (-65°C to 175°C). However, package geometry differs between QuadroMELF and MiniMELF variants, requiring PCB footprint verification and potential layout adjustments. Electrical performance is maintained across the substitution.

Q: What is the significance of the reverse leakage current difference between VLZ30D-GS18 (40 µA) and TLZ30D-GS18 (40 nA)?

A: The TLZ30D-GS18 exhibits three orders of magnitude lower reverse leakage current, indicating superior junction quality and reduced parasitic current paths. This improvement benefits low-current precision circuits and reduces power consumption in standby conditions. The substitution provides enhanced performance in this parameter.

Q: Is the 1N5545BUR-1 suitable for automotive applications?

A: The 1N5545BUR-1 does not carry AEC-Q101 automotive qualification designation. Additionally, this component is RoHS non-compliant, which may conflict with automotive supply chain requirements. The 1N5545BUR-1 is not recommended for automotive-grade applications.

Q: What are the package compatibility implications of substituting the VLZ30D-GS18?

A: The VLZ30D-GS18 uses SOD-80 QuadroMELF packaging. The TLZ30D-GS18 substitute uses SOD-80 MiniMELF, which shares the same SOD-80 designation but differs in physical dimensions. The 1N5545BUR-1 uses DO-213AA packaging, which is physically distinct. PCB footprint verification is mandatory for both substitutes; QuadroMELF to MiniMELF substitution may require minor layout adjustments, while DO-213AA substitution requires complete footprint redesign.

Q: Why is the VLZ30D-GS18 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The TLZ30D-GS18 represents the manufacturer's active replacement within the Vishay product line, offering improved electrical characteristics and continued supply availability.

Q: Can both substitute parts be used interchangeably in the same design?

A: No. The TLZ30D-GS18 and 1N5545BUR-1 have different package geometries and compliance profiles. Design selection must be made based on specific application requirements: TLZ30D-GS18 for RoHS-compliant applications, and 1N5545BUR-1 only when RoHS compliance is not required. PCB layout differs for each substitute.