VLZ11C-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ11C-GS18 is a Zener Diode rated at 11.1 V nominal 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, necessitating identification of equivalent and substitute parts for ongoing design support and procurement. The part carries AEC-Q101 automotive qualification and is ROHS3 compliant.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	11.1 V
Power - Max	500 mW
Impedance (Max) (Zzt)	10 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 10.28 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 Variant
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the VLZ11C-GS18 is determined by the following critical parameters: nominal Zener voltage (11 V to 11.1 V range), maximum power dissipation (500 mW), surface mount mounting type, and operating temperature range (-65°C to 175°C). The substitute parts are grouped into two categories based on package compatibility and electrical characteristics:

Category 1: Direct Vishay Equivalent The TLZ11C-GS18 represents a direct manufacturer equivalent from Vishay, differing primarily in series designation (TLZ versus VLZ), package variant (MiniMELF versus QuadroMELF), and product status (Active versus Obsolete). Both maintain identical electrical specifications for Zener voltage, power rating, and operating temperature.

Category 2: Cross-Manufacturer Alternatives The 1N4105UR-1, 1N4698UR-1, and 1N5531BUR-1 from Microchip Technology provide functional equivalence at the 11 V Zener voltage and 500 mW power rating. These parts utilize the DO-213AA package format and maintain the required operating temperature range. Impedance values and reverse leakage characteristics vary within acceptable ranges for general-purpose Zener diode applications.

Parameter Comparison

Parameter	VLZ11C-GS18	TLZ11C-GS18	1N4105UR-1	1N4698UR-1	1N5531BUR-1
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip
Voltage - Zener (Nom) (Vz)	11.1 V	11 V	11 V	11 V	11 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	10 Ohms	10 Ohms	200 Ohms	Not Specified	80 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 10.28 V	40 nA @ 10.28 V	50 nA @ 8.5 V	50 nA @ 8.4 V	50 nA @ 9.9 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
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA	DO-213AA (Glass)	DO-213AA
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	Not Specified	RoHS Non-Compliant
Tolerance	Not Specified	Not Specified	±5%	±5%	±5%

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement: The TLZ11C-GS18 is the preferred substitute, as it maintains Vishay manufacturer origin, Active product status, ROHS3 compliance, and equivalent electrical performance. The primary consideration is package footprint compatibility: TLZ11C-GS18 uses SOD-80 MiniMELF format versus the original QuadroMELF variant. Both are SOD-80 family packages with different physical dimensions.

For General-Purpose Applications without Automotive Qualification Mandate: The Microchip Technology alternatives (1N4105UR-1, 1N4698UR-1, 1N5531BUR-1) provide functional equivalence at the 11 V / 500 mW specification with Active product status. These parts utilize the DO-213AA package, which differs physically from SOD-80 formats. Selection among these three Microchip options depends on impedance requirements: 1N5531BUR-1 (80 Ohms) provides the closest impedance match to the original 10 Ohms specification, while 1N4105UR-1 (200 Ohms) represents the highest impedance variant.

Compliance Considerations: The TLZ11C-GS18 maintains ROHS3 compliance matching the original part. The Microchip alternatives carry RoHS non-compliant status (1N4105UR-1, 1N5531BUR-1) or unspecified compliance (1N4698UR-1), requiring evaluation against end-product regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLZ11C-GS18 directly replace the VLZ11C-GS18 on existing PCB layouts?

A: The TLZ11C-GS18 uses SOD-80 MiniMELF packaging while the VLZ11C-GS18 uses SOD-80 QuadroMELF packaging. Both are SOD-80 family components but with different physical dimensions and footprints. PCB layout compatibility requires verification of the specific footprint dimensions for each package variant.

Q: What is the primary difference between the Vishay TLZ11C-GS18 and the Microchip 1N5531BUR-1?

A: Both parts meet the 11 V nominal Zener voltage and 500 mW power rating specifications. The key differences are: (1) package format (SOD-80 MiniMELF versus DO-213AA), (2) impedance (10 Ohms versus 80 Ohms), (3) manufacturer (Vishay versus Microchip), and (4) RoHS compliance status (ROHS3 compliant versus non-compliant).

Q: Are the Microchip parts suitable for automotive applications?

A: The Microchip alternatives (1N4105UR-1, 1N4698UR-1, 1N5531BUR-1) do not carry AEC-Q101 automotive qualification. The original VLZ11C-GS18 and substitute TLZ11C-GS18 both meet AEC-Q101 requirements. For automotive applications, the TLZ11C-GS18 is the appropriate selection.

Q: What does the ±5% tolerance specification on the Microchip parts mean?

A: The ±5% tolerance on Zener voltage indicates that the actual Zener voltage will fall within the range of 10.45 V to 11.55 V (±5% of 11 V nominal). The original VLZ11C-GS18 does not specify a tolerance value. This tolerance specification affects circuit design margins and must be evaluated against application requirements.

Q: Why do the reverse leakage current values differ significantly between parts?

A: The VLZ11C-GS18 specifies 40 µA reverse leakage, while all substitute parts specify leakage in the nanoampere range (40 nA to 50 nA). This represents a 1000-fold difference. The measurement conditions differ (voltage and temperature points vary), and manufacturing process improvements in newer parts contribute to lower leakage characteristics. Application circuits requiring minimal reverse leakage benefit from the lower values in substitute parts.

Q: Can I use the 1N4105UR-1 in place of the VLZ11C-GS18 if package size is not a constraint?

A: Electrical substitution is feasible based on matching Zener voltage (11 V) and power rating (500 mW). However, the 1N4105UR-1 carries RoHS non-compliant status and lacks AEC-Q101 automotive qualification. Additionally, the impedance specification (200 Ohms) differs substantially from the original (10 Ohms). Application-specific circuit analysis is required to determine if these differences are acceptable.

Q: What is the significance of the SOD-80 package variants (QuadroMELF versus MiniMELF)?

A: Both QuadroMELF and MiniMELF are SOD-80 family packages for surface mount Zener diodes. MiniMELF represents a smaller physical footprint compared to QuadroMELF. The electrical performance is equivalent; the distinction is purely mechanical. PCB layout compatibility depends on the specific footprint design used in the original design.

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