VLZ22D-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ22D-GS18 is a Zener diode rated at 22.08 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the SOD-80 QuadroMELF package and meets automotive-grade specifications under AEC-Q101 qualification. The part is currently classified as obsolete, necessitating identification of equivalent and substitute components that maintain functional compatibility while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22.08	V
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 20.4 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the VLZ22D-GS18 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage nominal rating within the 22 V to 22.08 V range
Power dissipation rating of 500 mW minimum
Surface mount mounting type
Operating temperature range of -65°C to 175°C minimum
RoHS3 compliance
REACH unaffected status

Secondary Compatibility Factors:

Impedance characteristics (maximum 30 to 100 Ohms acceptable)
Reverse leakage current specifications
Forward voltage characteristics
Package form factor compatibility (SOD-80 variants and DO-213 series)

The identified substitute parts meet these criteria through equivalent electrical performance and compliance certifications, though packaging and specific parameter tolerances may vary.

Parameter Comparison

Parameter	VLZ22D-GS18 (Main)	TLZ22D-GS18 (Substitute)	1N5541BUR-1 (Substitute)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom)	22.08 V	22 V	22 V
Tolerance	-	-	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	30 Ohms	30 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 20.4 V	40 nA @ 20.4 V	10 nA @ 19.8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C
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	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

TLZ22D-GS18 (Vishay General Semiconductor - Diodes Division)

The TLZ22D-GS18 is the primary direct substitute for the VLZ22D-GS18. Both components are manufactured by Vishay General Semiconductor and share identical electrical specifications: 22 V nominal zener voltage, 500 mW power rating, 30 Ohms maximum impedance, and -65°C to 175°C operating temperature range. The TLZ22D-GS18 maintains active product status and ROHS3 compliance. The primary difference is the package variant: TLZ22D-GS18 uses SOD-80 MiniMELF (DO-213AC) versus the VLZ22D-GS18 QuadroMELF package. Both are SOD-80 form factors suitable for surface mount assembly. The TLZ22D-GS18 exhibits superior reverse leakage characteristics (40 nA versus 40 µA), representing improved performance. This substitute is recommended for direct replacement in applications where the MiniMELF package footprint is compatible with the original design.

1N5541BUR-1 (Microchip Technology)

The 1N5541BUR-1 is a secondary substitute manufactured by Microchip Technology. This component meets the core electrical requirements with 22 V nominal zener voltage and 500 mW power dissipation across the -65°C to 175°C operating temperature range. The 1N5541BUR-1 features a DO-213AA package, which differs from the original SOD-80 form factor. Key electrical differences include higher impedance (100 Ohms maximum versus 30 Ohms), lower forward voltage (1.1 V versus 1.5 V at 200 mA), and superior reverse leakage performance (10 nA). The component includes ±5% zener voltage tolerance specification. This substitute is suitable for applications where package footprint compatibility can be accommodated and where the higher impedance specification does not conflict with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLZ22D-GS18 be used as a direct replacement for the VLZ22D-GS18?

A: The TLZ22D-GS18 is electrically equivalent to the VLZ22D-GS18 with identical zener voltage (22 V nominal), power rating (500 mW), impedance (30 Ohms maximum), and operating temperature range (-65°C to 175°C). The primary consideration is package compatibility. The TLZ22D-GS18 uses SOD-80 MiniMELF (DO-213AC) packaging while the VLZ22D-GS18 uses SOD-80 QuadroMELF. Both are SOD-80 variants with different physical dimensions. PCB layout and footprint compatibility must be verified before substitution.

Q: What are the key differences between the TLZ22D-GS18 and 1N5541BUR-1?

A: Both components share 22 V nominal zener voltage and 500 mW power rating. The TLZ22D-GS18 maintains 30 Ohms maximum impedance matching the original VLZ22D-GS18, while the 1N5541BUR-1 has 100 Ohms maximum impedance. The 1N5541BUR-1 offers lower forward voltage (1.1 V versus 1.5 V at 200 mA) and superior reverse leakage (10 nA versus 40 nA). Package form factors differ: TLZ22D-GS18 uses SOD-80 MiniMELF while 1N5541BUR-1 uses DO-213AA. The 1N5541BUR-1 includes ±5% zener voltage tolerance specification.

Q: Why does the VLZ22D-GS18 show as obsolete?

A: The VLZ22D-GS18 is classified as obsolete by the manufacturer. The TLZ22D-GS18 and 1N5541BUR-1 are active products with current manufacturing and distribution support. For new designs or component replenishment, active substitute parts are recommended to ensure long-term availability and supply chain continuity.

Q: Are there compliance differences between the substitute parts?

A: Both the VLZ22D-GS18 and TLZ22D-GS18 are ROHS3 compliant and REACH unaffected. Both maintain automotive-grade specifications with AEC-Q101 qualification (VLZ22D-GS18 explicitly; TLZ22D-GS18 inherits Vishay automotive-grade standards). The 1N5541BUR-1 is REACH unaffected but RoHS status is not specified in the provided data. Compliance verification with specific application requirements is necessary before final selection.

Q: What is the significance of the reverse leakage current differences?

A: The VLZ22D-GS18 specifies 40 µA reverse leakage at 20.4 V, while the TLZ22D-GS18 specifies 40 nA and the 1N5541BUR-1 specifies 10 nA at similar voltages. Lower reverse leakage indicates reduced parasitic current flow in reverse bias conditions. Applications sensitive to leakage current (high-impedance circuits, precision analog circuits) benefit from the improved characteristics of the substitute parts. Standard applications typically tolerate the original specification.

Q: Can package dimensions be interchanged between SOD-80 variants?

A: SOD-80 QuadroMELF and SOD-80 MiniMELF are distinct package variants with different physical dimensions and footprints. While both are classified as SOD-80, they are not mechanically interchangeable on PCBs designed for specific package types. DO-213AA is a separate package family. PCB footprint verification is mandatory before substitution to ensure proper component placement and solder joint formation.

Q: What factors should determine which substitute to select?

A: Selection between TLZ22D-GS18 and 1N5541BUR-1 depends on: (1) PCB footprint compatibility with available package options, (2) impedance requirements (30 Ohms versus 100 Ohms), (3) forward voltage specifications for the application circuit, (4) reverse leakage current sensitivity, (5) compliance certification requirements, and (6) supply chain and cost considerations. The TLZ22D-GS18 maintains closer electrical equivalence to the original part, while the 1N5541BUR-1 offers alternative sourcing from a different manufacturer.

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