VLZ12B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ12B-GS18 is a Zener Diode rated at 11.75 V 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, requiring identification of equivalent and substitute parts for ongoing design and procurement requirements. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	11.75	V
Power - Maximum	500	mW
Impedance (Maximum)	12	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 10.9 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package / Case	SOD-80 QuadroMELF	-
Mounting Type	Surface Mount	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the VLZ12B-GS18 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage nominal rating within the application tolerance band
Power dissipation capacity equal to or greater than 500 mW
Operating temperature range spanning -65°C to 175°C minimum
Forward voltage and reverse leakage characteristics suitable for the circuit function

Mechanical Compatibility Criteria:

Surface mount mounting type
Package footprint compatibility or acceptable PCB layout modification

Compliance Criteria:

RoHS compliance status
REACH compliance status
Automotive qualification where required by application

The substitute parts identified operate at 12 V nominal zener voltage, representing a 0.25 V deviation from the original 11.75 V specification. This deviation falls within typical circuit tolerance margins for voltage regulation and protection applications. All substitute parts maintain the 500 mW power rating, -65°C to 175°C operating range, and surface mount configuration.

Parameter Comparison

Parameter	VLZ12B-GS18	TLZ12B-GS18	1N4106UR-1	1N5532BUR-1	1N759AUR-1	1N963BUR-1
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip	Microchip
Voltage - Zener (Nom)	11.75 V	12 V	12 V	12 V	12 V	12 V
Tolerance	-	-	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	400 mW
Impedance (Max)	12 Ohms	12 Ohms	200 Ohms	90 Ohms	10 Ohms	11.5 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 10.9 V	40 nA @ 10.9 V	50 nA @ 9.2 V	50 nA @ 10.8 V	1 µA @ 9 V	1 µA @ 9.1 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA	DO-213AA	DO-213AA	DO-213AA
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	Not specified

Engineering Selection Recommendations

Primary Recommendation: TLZ12B-GS18

The TLZ12B-GS18 is the direct manufacturer equivalent from Vishay General Semiconductor - Diodes Division. This part maintains ROHS3 compliance matching the original specification and carries Active product status, ensuring long-term availability. The TLZ12B-GS18 operates at 12 V nominal zener voltage with identical 500 mW power rating and 12 Ohms maximum impedance. The primary distinction is the package variant: SOD-80 MiniMELF versus the original SOD-80 QuadroMELF. Both packages are SOD-80 form factors with compatible footprints for most applications. The TLZ12B-GS18 demonstrates superior reverse leakage characteristics (40 nA versus 40 µA), indicating improved performance in low-current applications.

Secondary Recommendations: 1N759AUR-1 and 1N963BUR-1

Both 1N759AUR-1 and 1N963BUR-1 from Microchip Technology provide 12 V nominal zener voltage with impedance values closely matching the original specification (10 Ohms and 11.5 Ohms respectively). These parts carry Active product status and REACH compliance. However, both are RoHS non-compliant, which may restrict use in applications requiring ROHS3 certification. The 1N963BUR-1 operates at 400 mW maximum power, representing a 100 mW reduction from the original 500 mW specification and may not be suitable for applications requiring full 500 mW dissipation capacity.

Alternative Options: 1N4106UR-1 and 1N5532BUR-1

The 1N4106UR-1 and 1N5532BUR-1 maintain 12 V nominal zener voltage and 500 mW power rating with Active product status. The 1N4106UR-1 exhibits elevated impedance (200 Ohms) compared to the original specification, while 1N5532BUR-1 provides intermediate impedance (90 Ohms). Both are RoHS non-compliant. These options are suitable for applications where RoHS compliance is not mandated and where the impedance variation does not affect circuit performance.

Frequently Asked Questions (FAQ)

Q: Why is the VLZ12B-GS18 marked as Obsolete?

A: The VLZ12B-GS18 has been discontinued by Vishay General Semiconductor - Diodes Division. Active substitute parts with equivalent electrical and mechanical characteristics are available to support ongoing production and maintenance requirements.

Q: Can the TLZ12B-GS18 directly replace the VLZ12B-GS18 without PCB modification?

A: The TLZ12B-GS18 uses SOD-80 MiniMELF packaging while the original uses SOD-80 QuadroMELF packaging. Both are SOD-80 form factors. PCB footprint compatibility depends on the specific layout design. Verification of pad dimensions and spacing is required before implementation.

Q: What is the significance of the 0.25 V difference between 11.75 V and 12 V zener ratings?

A: The 0.25 V difference represents approximately 2.1% deviation from the original specification. This variation falls within typical circuit tolerance margins for voltage regulation and protection applications. Applications with strict voltage tolerance requirements should evaluate circuit performance impact before substitution.

Q: Why do the Microchip substitute parts show RoHS non-compliance?

A: RoHS compliance status is determined by the manufacturing process and material composition of each part. The Microchip alternatives may utilize different manufacturing processes or material selections that do not meet ROHS3 requirements. Applications requiring ROHS3 certification should prioritize the TLZ12B-GS18, which maintains this compliance.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current determines the quality of the reverse blocking characteristic. Lower reverse leakage (measured in nanoamperes) indicates superior performance in low-current applications and reduced power dissipation in standby conditions. The TLZ12B-GS18 demonstrates significantly lower reverse leakage (40 nA) compared to the original VLZ12B-GS18 (40 µA), representing improved performance.

Q: Is the 1N963BUR-1 suitable for all applications requiring 500 mW dissipation?

A: The 1N963BUR-1 is rated for 400 mW maximum power dissipation, which is 100 mW below the original 500 mW specification. This part is not suitable for applications requiring full 500 mW dissipation capacity. Applications operating near the 500 mW limit should select parts with 500 mW or greater ratings.

Q: What packaging considerations apply when substituting these parts?

A: The original VLZ12B-GS18 uses SOD-80 QuadroMELF packaging. The TLZ12B-GS18 uses SOD-80 MiniMELF packaging. The Microchip alternatives use DO-213AA packaging. All are surface mount packages with different physical dimensions. PCB layout modifications may be required when transitioning between package types. Footprint verification is mandatory before production implementation.

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

A: Substitution decisions should be based on specific application requirements including voltage tolerance, power dissipation, impedance characteristics, and compliance certifications. While all identified parts operate at 12 V nominal zener voltage, variations in impedance, reverse leakage, and power rating may affect circuit performance. Each substitution should be evaluated individually within the context of the complete circuit design.

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