VLZ51-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ51-GS18 is a Zener Diode rated at 51 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 is qualified to AEC-Q101 automotive standards. The product is currently classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	51 V
Power - Max	500 mW
Impedance (Max)	100 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 45.6 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	SOD-80
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the VLZ51-GS18 is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 51 V nominal
Power dissipation: 500 mW maximum
Operating temperature range: -65°C to 175°C
Surface mount configuration

Secondary Electrical Criteria:

Impedance characteristics (Zzt)
Reverse leakage current specifications
Forward voltage characteristics

Compliance & Qualification Criteria:

RoHS compliance status
Automotive grade qualification (AEC-Q101)
REACH and ECCN classifications

Substitute parts must maintain electrical equivalence within the specified parameter ranges while accommodating variations in package geometry (SOD-80 variants) and manufacturing source. The obsolete status of the primary part necessitates active alternatives with equivalent or superior electrical performance characteristics.

Parameter Comparison

Parameter	VLZ51-GS18	TLZ51-GS18	1N4126UR-1
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom)	51 V	51 V	51 V
Tolerance	-	-	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	100 Ohms	300 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 45.6 V	40 nA @ 45.6 V	10 nA @ 38.8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Grade	Automotive	Not specified	Not specified
Qualification	AEC-Q101	Not specified	Not specified

Engineering Selection Recommendations

TLZ51-GS18 (Vishay General Semiconductor - Diodes Division)

The TLZ51-GS18 is the primary direct substitute for the VLZ51-GS18. Both components are manufactured by Vishay General Semiconductor and share identical electrical specifications: 51 V nominal zener voltage, 500 mW power rating, 100 Ohms maximum impedance, and -65°C to 175°C operating temperature range. The TLZ51-GS18 is currently in Active product status, ensuring long-term availability. Both parts maintain ROHS3 compliance. The primary difference is packaging geometry: TLZ51-GS18 uses SOD-80 MiniMELF configuration versus the QuadroMELF variant of the original part. The TLZ51-GS18 demonstrates superior reverse leakage performance (40 nA versus 40 µA), indicating improved device quality. This substitute is suitable for direct replacement in applications where SOD-80 MiniMELF footprint compatibility exists.

1N4126UR-1 (Microchip Technology)

The 1N4126UR-1 provides electrical equivalence at the 51 V zener voltage and 500 mW power rating with full operating temperature range alignment (-65°C to 175°C). This component is manufactured by Microchip Technology and maintains Active product status. The 1N4126UR-1 exhibits superior reverse leakage characteristics (10 nA) and lower forward voltage (1.1 V versus 1.5 V), indicating enhanced performance in certain circuit applications. However, this substitute presents two significant considerations: the impedance specification is 300 Ohms (versus 100 Ohms for the primary part), and the component is RoHS non-compliant. The package configuration is DO-213AA, requiring PCB footprint verification. This substitute is applicable in applications where RoHS compliance is not mandated and impedance tolerance permits the higher specification.

Frequently Asked Questions (FAQ)

Q: Can the TLZ51-GS18 be used as a direct replacement for the VLZ51-GS18?

A: The TLZ51-GS18 is electrically equivalent to the VLZ51-GS18 across all critical parameters: 51 V zener voltage, 500 mW power dissipation, 100 Ohms impedance, and identical operating temperature range. Both

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