VLZ30C-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ30C-GS08 is a Zener diode rated at 29.09 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is packaged in SOD-80 QuadroMELF surface mount configuration and qualified to AEC-Q101 automotive standards. The part is classified as obsolete, necessitating identification of equivalent alternatives that maintain functional and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	29.09	V
Power - Maximum	500	mW
Impedance (Maximum)	55	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 26.9 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-80 Variant	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the VLZ30C-GS08 is determined by the following critical parameters: nominal Zener voltage, maximum power dissipation, operating temperature range, mounting type, and package compatibility. The obsolete VLZ30C-GS08 operates at 29.09 V nominal with 500 mW maximum power in a SOD-80 QuadroMELF package.

Equivalent substitutes must satisfy these constraints:

Nominal Zener voltage within the functional operating range of 29–30 V
Maximum power rating of 500 mW
Surface mount configuration
Operating temperature range of -65°C to 175°C minimum
Compatible package footprint (SOD-80 or equivalent MiniMELF variants)
Compliance with automotive or industrial standards where applicable

The three identified substitutes meet these criteria through direct voltage and power equivalence, with variations in impedance, leakage current, and forward voltage characteristics that remain within acceptable engineering tolerances for Zener diode applications.

Parameter Comparison

Parameter	VLZ30C-GS08 (Main)	TLZ30C-GS08	1N5545BUR-1	BZV55-B30,115
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology	NXP Semiconductors
Voltage - Zener (Nominal)	29.09 V	30 V	30 V	30 V
Tolerance	-	-	±5%	±2%
Power - Maximum	500 mW	500 mW	500 mW	500 mW
Impedance (Maximum)	55 Ohms	80 Ohms	100 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 26.9 V	40 nA @ 26.9 V	10 nA @ 27 V	50 nA @ 700 mV
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	900 mV @ 10 mA
Operating Temperature Range	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 200°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 Variant	DO-213AC, MINI-MELF, SOD-80	DO-213AA	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	Not Specified

Engineering Selection Recommendations

TLZ30C-GS08 is the primary substitute for the VLZ30C-GS08. Both components are manufactured by Vishay General Semiconductor within the same product family (VLZ/TLZ series). The TLZ30C-GS08 is active in production, ROHS3 compliant, and maintains identical power rating and operating temperature range. The nominal voltage difference of 0.91 V (29.09 V to 30 V) is within acceptable tolerance for Zener diode applications. Package compatibility is confirmed through SOD-80 MiniMELF designation. This substitute provides the highest degree of functional and mechanical equivalence.

BZV55-B30,115 is a secondary substitute manufactured by NXP Semiconductors. This component meets all critical electrical parameters: 30 V nominal voltage, 500 mW power rating, and -65°C to 200°C operating range. The BZV55-B30,115 offers superior temperature range extension to 200°C and tighter voltage tolerance (±2%). Package compatibility is confirmed through DO-213AC and MINI-MELF designations. Inventory availability is significantly higher (244,858 units). This substitute is suitable for applications where extended temperature performance is beneficial.

1N5545BUR-1 is a tertiary substitute manufactured by Microchip Technology. This component satisfies core electrical requirements: 30 V nominal voltage and 500 mW power rating. However, the 1N5545BUR-1 is RoHS non-compliant, which may restrict use in regulated applications. The package designation (DO-213AA) differs from the original SOD-80 configuration, requiring PCB layout verification. This substitute is applicable only where RoHS compliance is not mandated.

For automotive-grade applications requiring AEC-Q101 qualification, the TLZ30C-GS08 is the recommended selection. For general industrial applications with extended temperature requirements, the BZV55-B30,115 provides enhanced performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TLZ30C-GS08 directly replace the VLZ30C-GS08 without PCB modification?

A: Yes. Both components use SOD-80 MiniMELF packaging with identical footprint geometry. No PCB layout changes are required. The 0.91 V nominal voltage difference (29.09 V to 30 V) is within standard Zener diode tolerance and does not require circuit redesign for typical applications.

Q: What is the significance of the impedance difference between the main part (55 Ohms) and substitutes (80–100 Ohms)?

A: Impedance affects dynamic response and noise characteristics. The TLZ30C-GS08 and BZV55-B30,115 both specify 80 Ohms impedance, representing a 45% increase from the original 55 Ohms. This difference is acceptable for voltage regulation and transient suppression applications. Applications requiring precise impedance matching should evaluate circuit performance through simulation or testing.

Q: Why is the 1N5545BUR-1 marked as RoHS non-compliant?

A: The 1N5545BUR-1 does not meet ROHS3 compliance standards, indicating the presence of restricted substances. This designation restricts use in applications subject to RoHS regulations, including consumer electronics and regulated industrial equipment. The TLZ30C-GS08 and BZV55-B30,115 are both ROHS3 compliant and are preferred for regulated applications.

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

A: Both designations refer to surface mount Zener diode packages with identical electrical footprints. QuadroMELF and MiniMELF are variant nomenclatures used by different manufacturers for the same DO-213AC package standard. Components are mechanically and electrically interchangeable on the PCB.

Q: How does the reverse leakage current difference affect circuit performance?

A: The VLZ30C-GS08 specifies 40 µA reverse leakage, while substitutes specify 40 nA to 50 nA. The original part exhibits significantly higher leakage (1000× greater). Substitutes provide superior leakage characteristics, resulting in lower standby current consumption and improved voltage regulation stability. This represents a performance improvement rather than a compatibility concern.

Q: Is the BZV55-B30,115 suitable for automotive applications?

A: The BZV55-B30,115 is not explicitly qualified to AEC-Q101 automotive standards. While it meets electrical and temperature requirements, automotive applications requiring formal AEC-Q101 qualification should use the TLZ30C-GS08, which maintains Vishay's automotive-grade designation.

Q: What inventory considerations apply to these substitutes?

A: The TLZ30C-GS08 has 10,200 units in stock. The BZV55-B30,115 has significantly higher availability at 244,858 units. The 1N5545BUR-1 has 967 units available. For high-volume production, the BZV55-B30,115 offers superior supply chain security.

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