VLZ12C-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ12C-GS18 is a Zener diode rated at 24.09 V, 500 mW, manufactured by Vishay General Semiconductor - Diodes Division in the SOD-80 QuadroMELF surface mount package. This component is classified as Obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24.09	V
Power - Max	500	mW
Impedance (Max)	12	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 11.2 V	µA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-80 QuadroMELF	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the VLZ12C-GS18 is constrained by the following critical parameters:

Zener Voltage (Vz): The nominal Zener voltage of 24.09 V is the primary functional specification. Substitute parts must operate at this voltage level to maintain circuit regulation and protection characteristics.

Power Dissipation (Pmax): The 500 mW maximum power rating defines thermal and current handling capability. Substitute parts must support this power level or higher.

Impedance (Zzt): The 12 Ohm maximum impedance specification affects voltage regulation quality and transient response.

Operating Temperature Range: The -65°C to 175°C range establishes environmental operating limits.

Mounting Type and Package: Surface mount configuration with SOD-80 package form factor determines PCB compatibility and assembly requirements.

Compliance Requirements: AEC-Q101 automotive qualification and ROHS3 compliance are mandatory for automotive applications.

The substitute parts listed (1N963BUR-1, 1N5532BUR-1, 1N759AUR-1, 1N4106UR-1, TLZ12C-GS18) operate at 12 V nominal Zener voltage, which differs from the main part specification of 24.09 V. These parts are functionally distinct and cannot serve as direct electrical substitutes for the VLZ12C-GS18 in applications requiring 24.09 V regulation or protection.

Parameter Comparison

Parameter	VLZ12C-GS18	TLZ12C-GS18	1N4106UR-1	1N5532BUR-1	1N759AUR-1	1N963BUR-1
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip	Microchip
Voltage - Zener (Nom)	24.09 V	12 V	12 V	12 V	12 V	12 V
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 @ 11.2 V	40 nA @ 11.2 V	50 nA @ 9.2 V	50 nA @ 10.8 V	1 µA @ 9 V	1 µA @ 9.1 V
Voltage - Forward (Vf) (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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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

Product Status Consideration: The VLZ12C-GS18 is classified as Obsolete. The TLZ12C-GS18 is the only listed substitute with Active product status from the original manufacturer (Vishay). However, the TLZ12C-GS18 operates at 12 V nominal Zener voltage, not 24.09 V, and therefore cannot serve as an electrical substitute in applications requiring the original voltage specification.

Compliance and Qualification: The VLZ12C-GS18 carries AEC-Q101 automotive qualification and ROHS3 compliance. The TLZ12C-GS18 maintains ROHS3 compliance and is from the same manufacturer, supporting continuity in automotive applications. The Microchip alternatives (1N4106UR-1, 1N5532BUR-1, 1N759AUR-1, 1N963BUR-1) are RoHS non-compliant, which may restrict their use in applications with RoHS compliance requirements.

Package Compatibility: The VLZ12C-GS18 uses SOD-80 QuadroMELF packaging. The TLZ12C-GS18 uses SOD-80 MiniMELF packaging, which differs in physical dimensions. The Microchip alternatives use DO-213AA packaging, which is distinct from both SOD-80 variants and requires PCB layout modification.

Voltage Specification Mismatch: All listed substitute parts operate at 12 V nominal Zener voltage. For applications requiring 24.09 V regulation or overvoltage protection, these substitutes are not functionally equivalent and cannot replace the VLZ12C-GS18 without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the TLZ12C-GS18 directly replace the VLZ12C-GS18 in my circuit?

A: No. While both are Vishay Zener diodes in SOD-80 packages, the TLZ12C-GS18 operates at 12 V nominal Zener voltage, whereas the VLZ12C-GS18 operates at 24.09 V. Direct substitution would alter circuit voltage regulation and protection characteristics. Additionally, the TLZ12C-GS18 uses MiniMELF packaging while the VLZ12C-GS18 uses QuadroMELF packaging, requiring PCB layout verification.

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

A: Both are SOD-80 surface mount packages but differ in physical dimensions and thermal characteristics. QuadroMELF is larger than MiniMELF. PCB footprints are not interchangeable without layout modification.

Q: Are the Microchip alternatives (1N4106UR-1, 1N5532BUR-1, 1N759AUR-1, 1N963BUR-1) suitable for automotive applications?

A: These parts are RoHS non-compliant, which may conflict with automotive compliance requirements. Additionally, they operate at 12 V, not 24.09 V, and use DO-213AA packaging instead of SOD-80. They are not suitable as direct replacements for the VLZ12C-GS18 in automotive circuits.

Q: Why do all substitute parts have 12 V Zener voltage instead of 24.09 V?

A: The substitute parts listed represent available alternatives in the Vishay and Microchip product portfolios. However, the voltage mismatch indicates these are not true electrical equivalents. For applications requiring 24.09 V Zener regulation, alternative sources or custom specifications must be evaluated.

Q: What is the impedance difference between these parts, and does it matter?

A: Impedance (Zzt) affects voltage regulation quality and transient response. The VLZ12C-GS18 specifies 12 Ohms maximum. The Microchip alternatives range from 10 to 200 Ohms. Higher impedance results in poorer voltage regulation. The 1N4106UR-1 at 200 Ohms represents significantly degraded regulation performance compared to the original specification.

Q: Can I use 1N963BUR-1 instead of VLZ12C-GS18 if my circuit can tolerate lower power dissipation?

A: No. The 1N963BUR-1 is rated at 400 mW maximum power, which is lower than the VLZ12C-GS18 specification of 500 mW. More critically, it operates at 12 V instead of 24.09 V, making it functionally incompatible regardless of power rating.

Q: What should I do if I need to replace an obsolete VLZ12C-GS18?

A: Evaluate your circuit requirements for the specific Zener voltage needed. If 24.09 V regulation is required, consult alternative manufacturers for equivalent 24.09 V Zener diodes in compatible packages. If circuit redesign is possible, the 12 V alternatives may be considered, but compliance requirements (RoHS, AEC-Q101) and package compatibility must be verified for your application.

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