VLZ11B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ11B-GS18 is a Zener Diode rated at 10.78 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, necessitating identification of equivalent and substitute parts for ongoing design support and procurement requirements. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10.78	V
Power - Maximum	500	mW
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 9.98 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package Type	SOD-80 QuadroMELF	Surface Mount
Grade	Automotive	AEC-Q101
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the VLZ11B-GS18 is determined by the following critical parameters: nominal Zener voltage, maximum power dissipation, operating temperature range, and surface mount compatibility. The substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Voltage Series Equivalent

TLZ11B-GS18: Shares the same manufacturer (Vishay), operates at 11 V nominal (within acceptable tolerance variance for Zener applications), maintains 500 mW power rating, and provides identical operating temperature range. Package variant is SOD-80 MiniMELF rather than QuadroMELF, representing a physical footprint change within the same package family.

Category 2: Cross-Manufacturer Alternatives

1N4105UR-1, 1N4698UR-1, 1N5531BUR-1: All manufactured by Microchip Technology, rated at 11 V nominal with 500 mW power dissipation and identical operating temperature range. These parts utilize DO-213AA package format, representing a different physical package than the original SOD-80 variant. All three maintain surface mount mounting type and support the required thermal and electrical operating envelope.

Substitution logic is based strictly on: (1) Zener voltage nominal rating within the 10.78 V to 11 V range, (2) 500 mW power rating maintenance, (3) -65°C to 175°C operating temperature compatibility, and (4) surface mount technology compatibility.

Parameter Comparison

Parameter	VLZ11B-GS18	TLZ11B-GS18	1N4105UR-1	1N4698UR-1	1N5531BUR-1
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip
Voltage - Zener (Nom)	10.78 V	11 V	11 V	11 V	11 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	10 Ohms	10 Ohms	200 Ohms	Not Specified	80 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 9.98 V	40 nA @ 9.98 V	50 nA @ 8.5 V	50 nA @ 8.4 V	50 nA @ 9.9 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
Operating Temperature	-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
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

Engineering Selection Recommendations

TLZ11B-GS18 is the primary substitute for the VLZ11B-GS18. Both components are manufactured by Vishay, maintain ROHS3 compliance, and share identical electrical specifications with the exception of nominal Zener voltage (11 V versus 10.78 V). The TLZ11B-GS18 is in Active product status, ensuring long-term availability. The package variant change from SOD-80 QuadroMELF to SOD-80 MiniMELF requires PCB layout verification but remains within the SOD-80 family. This part is recommended for applications where Vishay component continuity and RoHS3 compliance are required.

1N4105UR-1, 1N4698UR-1, and 1N5531BUR-1 are cross-manufacturer alternatives manufactured by Microchip Technology. All three maintain the 11 V nominal Zener voltage and 500 mW power rating. These parts are in Active product status and support the full operating temperature range. However, these alternatives are RoHS non-compliant or have unspecified RoHS status, which may conflict with automotive or environmental compliance requirements. The DO-213AA package format differs from the original SOD-80 variant, requiring PCB footprint redesign. These parts are suitable for applications where RoHS compliance is not mandated and package redesign is acceptable.

Selection between substitute parts depends on: (1) RoHS compliance requirements, (2) package footprint constraints, (3) manufacturer preference, and (4) impedance specifications for circuit performance.

Frequently Asked Questions (FAQ)

Q: Can the TLZ11B-GS18 directly replace the VLZ11B-GS18 without PCB modification?

A: The TLZ11B-GS18 uses SOD-80 MiniMELF packaging while the original uses SOD-80 QuadroMELF. Both are SOD-80 variants but have different physical dimensions. PCB footprint verification is required. Electrical compatibility is confirmed across all specified parameters.

Q: What is the significance of the voltage difference between 10.78 V and 11 V?

A: The 0.22 V difference represents a 2% variance in nominal Zener voltage. For Zener diode applications, this variance is within typical tolerance ranges and does not prevent substitution. Circuit design margins should accommodate this voltage shift.

Q: Why are the Microchip alternatives RoHS non-compliant?

A: RoHS compliance status is determined by the manufacturing process and material composition. The provided data indicates 1N4105UR-1 and 1N5531BUR-1 are RoHS non-compliant. Applications requiring RoHS3 compliance should use the TLZ11B-GS18 or verify compliance requirements with the design authority.

Q: What is the impact of impedance differences between substitute parts?

A: The VLZ11B-GS18 and TLZ11B-GS18 both specify 10 Ohms maximum impedance. The Microchip alternatives specify 200 Ohms (1N4105UR-1), 80 Ohms (1N5531BUR-1), or unspecified impedance (1N4698UR-1). Higher impedance affects transient response and voltage regulation characteristics. Applications sensitive to impedance performance should prioritize parts with lower impedance specifications.

Q: Are all substitute parts suitable for automotive applications?

A: The VLZ11B-GS18 carries AEC-Q101 automotive qualification. The TLZ11B-GS18 does not specify AEC-Q101 qualification in the provided data. The Microchip alternatives do not specify automotive qualification. Applications requiring automotive-grade components should confirm qualification status with the manufacturer or design authority.

Q: What package considerations apply when switching from SOD-80 to DO-213AA?

A: SOD-80 and DO-213AA are distinct package families with different physical dimensions, lead spacing, and PCB footprints. Switching to DO-213AA requires PCB redesign and re-qualification of the assembly process. The electrical performance remains compatible, but mechanical integration differs significantly.

Q: Can reverse leakage current differences affect circuit performance?

A: The VLZ11B-GS18 specifies 40 µA reverse leakage, while all substitute parts specify 40-50 nA. This represents a 1000-fold reduction in leakage current. Lower leakage improves circuit efficiency and reduces standby power consumption. Applications with tight leakage specifications should evaluate this parameter against design requirements.

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