VLZ4V3B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ4V3B-GS18 is a Zener diode rated at 4.3 V nominal voltage with 500 mW maximum power dissipation in a SOD-80 QuadroMELF surface mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Automotive grade with AEC-Q101 qualification. The part is currently listed as Obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	4.3 V
Power - Max	500 mW
Impedance (Max)	40 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the VLZ4V3B-GS18 is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Zener voltage: 4.3 V nominal
Maximum power dissipation: 500 mW
Operating temperature range: -65°C to 175°C
Surface mount technology requirement

Mechanical Compatibility Criteria:

Surface mount package format
Physical footprint compatibility with SOD-80 or equivalent package variants

Compliance Requirements:

RoHS3 compliance
REACH unaffected status
Automotive grade or equivalent qualification

Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain surface mount compatibility. Package variants within the SOD-80 family (QuadroMELF, MiniMELF, DO-213AA) are acceptable provided electrical characteristics remain within specified limits.

Parameter Comparison

Parameter	VLZ4V3B-GS18	TLZ4V3B-GS18	1N4623UR-1
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V
Tolerance	-	-	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	40 Ohms	40 Ohms	1600 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 1 V	3 µA @ 1 V	2 µA @ 2 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	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

TLZ4V3B-GS18 (Vishay General Semiconductor)

The TLZ4V3B-GS18 is the primary direct substitute for the VLZ4V3B-GS18. Both components are manufactured by Vishay General Semiconductor and share identical electrical specifications: 4.3 V nominal zener voltage, 500 mW maximum power, 40 Ohms maximum impedance, and -65°C to 175°C operating temperature range. The TLZ4V3B-GS18 is currently in Active product status, ensuring long-term availability. The primary difference is the package variant: TLZ4V3B-GS18 uses SOD-80 MiniMELF (DO-213AC) versus the original QuadroMELF format. Both packages are surface mount variants within the SOD-80 family. The TLZ4V3B-GS18 maintains ROHS3 compliance and REACH unaffected status. This substitute is recommended for applications where package footprint compatibility with MiniMELF dimensions is acceptable.

1N4623UR-1 (Microchip Technology)

The 1N4623UR-1 is a manufacturer-recommended substitute manufactured by Microchip Technology. This component maintains the 4.3 V nominal zener voltage, 500 mW maximum power rating, and -65°C to 175°C operating temperature range. The 1N4623UR-1 includes ±5% voltage tolerance specification and features improved forward voltage characteristics (1.1 V @ 200 mA versus 1.5 V @ 200 mA). However, the impedance specification differs significantly at 1600 Ohms maximum versus 40 Ohms for the original part. The package format is DO-213AA, a surface mount variant. The 1N4623UR-1 is currently in Active product status with ROHS3 compliance and REACH unaffected status. This substitute is suitable for applications where the higher impedance specification and improved forward voltage characteristics are compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLZ4V3B-GS18 be used as a direct replacement for the VLZ4V3B-GS18?

A: The TLZ4V3B-GS18 is electrically equivalent to the VLZ4V3B-GS18 with identical zener voltage (4.3 V), power rating (500 mW), impedance (40 Ohms), and operating temperature range (-65°C to 175°C). The primary difference is the package variant: TLZ4V3B-GS18 uses SOD-80 MiniMELF (DO-213AC) while the original uses SOD-80 QuadroMELF. Substitution is valid provided the PCB layout accommodates the MiniMELF footprint dimensions.

Q: What are the key differences between the 1N4623UR-1 and the VLZ4V3B-GS18?

A: The 1N4623UR-1 maintains the same 4.3 V zener voltage, 500 mW power rating, and operating temperature range. Differences include: impedance specification of 1600 Ohms (versus 40 Ohms), forward voltage of 1.1 V @ 200 mA (versus 1.5 V @ 200 mA), voltage tolerance of ±5%, and package format of DO-213AA. These differences may affect circuit performance in applications sensitive to impedance or forward voltage characteristics.

Q: Are all three parts automotive qualified?

A: The VLZ4V3B-GS18 carries Automotive grade classification with AEC-Q101 qualification. The TLZ4V3B-GS18 and 1N4623UR-1 do not list explicit automotive qualification in the provided specifications. Automotive applications requiring AEC-Q101 certification should verify qualification status with manufacturers before substitution.

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

A: Both are surface mount SOD-80 package variants. QuadroMELF and MiniMELF differ in physical dimensions and footprint. The MiniMELF variant (used in TLZ4V3B-GS18) has a smaller form factor. PCB layout compatibility must be verified before substitution, as the different footprints may not be interchangeable on existing designs.

Q: Why is the VLZ4V3B-GS18 listed as Obsolete?

A: The VLZ4V3B-GS18 is marked as Obsolete by the manufacturer, indicating it is no longer in active production. The TLZ4V3B-GS18 and 1N4623UR-1 are both listed as Active products, ensuring continued availability for new designs and production requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The VLZ4V3B-GS18, TLZ4V3B-GS18, and 1N4623UR-1 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the impedance difference between the 1N4623UR-1 and the original part?

A: The 1N4623UR-1 has a maximum impedance of 1600 Ohms compared to 40 Ohms for the VLZ4V3B-GS18. Impedance affects the zener diode's dynamic response and voltage regulation characteristics. Applications requiring low impedance for fast transient response or tight voltage regulation may not be compatible with the 1N4623UR-1 substitute.

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