VLZ22B-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ22B-GS18 is a Zener Diode rated at 20.64 V with 500 mW power dissipation in a Surface Mount SOD-80 QuadroMELF package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as Obsolete, requiring identification of equivalent alternatives for new designs and ongoing production support. The part carries Automotive grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for regulated applications. Substitute parts must maintain electrical performance within the specified operating parameters while accommodating modern packaging and availability constraints.

Substiute Parts

VLZ22B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 1053VLZ22B-GS18 Datasheet

Current PartRFQ

TLZ22B-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 829TLZ22B-GS18 Datasheet

DirectRFQ

1N5541BUR-1

Microchip TechnologyIn Stock: 8391N5541BUR-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VLZ22B-GS18 are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Zener voltage within the application tolerance band (20.64 V nominal)
• Power dissipation rating of 500 mW or greater
• Operating temperature range of -65°C to 175°C minimum
• Surface Mount technology requirement
• Impedance characteristics suitable for circuit function

Mechanical Compatibility Criteria:

• SOD-80 package family (includes SOD-80 QuadroMELF, SOD-80 MiniMELF, and DO-213 variants)
• Surface Mount mounting type

Compliance and Status Criteria:

• Active product status preferred for long-term availability
• ROHS3 compliance maintained
• Automotive-grade qualification or equivalent

The substitute parts listed below satisfy these criteria with documented electrical parameters and current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

TLZ22B-GS18 (Vishay General Semiconductor - Diodes Division)

The TLZ22B-GS18 is the primary substitute for the VLZ22B-GS18. Both components are manufactured by Vishay General Semiconductor and share identical electrical specifications for power rating (500 mW), impedance (30 Ohms), forward voltage characteristics, and operating temperature range. The TLZ22B-GS18 is currently in Active product status, ensuring long-term availability and supply chain continuity. The zener voltage is specified at 22 V compared to 20.64 V in the main part, representing a 6.6% increase. The TLZ22B-GS18 demonstrates superior reverse leakage performance (40 nA versus 40 µA), indicating lower standby current consumption. Both parts maintain ROHS3 compliance. The package variant changes from SOD-80 QuadroMELF to SOD-80 MiniMELF, which are mechanically compatible within the SOD-80 family. This substitution is suitable for applications where the zener voltage tolerance accommodates the 22 V specification.

1N5541BUR-1 (Microchip Technology)

The 1N5541BUR-1 is an alternative substitute manufactured by Microchip Technology. This component shares the 500 mW power rating and -65°C to 175°C operating temperature range with the main part. The zener voltage is specified at 22 V with ±5% tolerance, providing defined voltage accuracy. The impedance specification is higher at 100 Ohms compared to 30 Ohms in the main part, which may affect circuit performance in applications sensitive to dynamic impedance. Reverse leakage is significantly lower at 10 nA, and forward voltage is reduced to 1.1 V at 200 mA. The package is DO-213AA, which is mechanically compatible within the SOD-80 family. This substitution is suitable for applications where the higher impedance and different package form factor are acceptable, and where the 22 V zener voltage meets circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLZ22B-GS18 directly replace the VLZ22B-GS18 in existing designs?

A: The TLZ22B-GS18 is electrically compatible for applications where a 22 V zener voltage is acceptable. Both parts share identical power ratings (500 mW), impedance (30 Ohms), forward voltage characteristics, and operating temperature ranges. The package change from SOD-80 QuadroMELF to SOD-80 MiniMELF requires PCB layout verification, as both are SOD-80 variants with different physical dimensions. Automotive-grade qualification is specified only for the VLZ22B-GS18; the TLZ22B-GS18 qualification status is not provided in the available data.

Q: What is the voltage difference between the main part and substitute parts?

A: The VLZ22B-GS18 is specified at 20.64 V nominal zener voltage. Both substitute parts (TLZ22B-GS18 and 1N5541BUR-1) are specified at 22 V nominal, representing a 6.6% increase. The 1N5541BUR-1 includes ±5% tolerance specification, providing defined voltage accuracy. Circuit designs must accommodate this voltage shift or confirm that the application tolerance band includes 22 V operation.

Q: How do the reverse leakage characteristics compare?

A: The VLZ22B-GS18 specifies 40 µA reverse leakage at 19.6 V. The TLZ22B-GS18 specifies 40 nA at 19.6 V, representing a 1000-fold reduction. The 1N5541BUR-1 specifies 10 nA at 19.8 V, representing a 4000-fold reduction. Lower reverse leakage reduces standby current consumption and improves circuit efficiency in applications where leakage current is a design constraint.

Q: Are the package variants mechanically compatible?

A: All three parts use Surface Mount technology within the SOD-80 package family. The VLZ22B-GS18 uses SOD-80 QuadroMELF, the TLZ22B-GS18 uses SOD-80 MiniMELF, and the 1N5541BUR-1 uses DO-213AA. These variants have different physical dimensions and footprints. PCB layout and assembly equipment compatibility must be verified before substitution. Consult package datasheets for precise dimensional specifications.

Q: What is the impedance difference between the 1N5541BUR-1 and the main part?

A: The VLZ22B-GS18 specifies maximum impedance of 30 Ohms. The 1N5541BUR-1 specifies maximum impedance of 100 Ohms, representing a 3.3-fold increase. Higher impedance affects dynamic response in circuits sensitive to zener impedance characteristics. Applications requiring low impedance performance should prioritize the TLZ22B-GS18 or main part.

Q: Is the 1N5541BUR-1 suitable for automotive applications?

A: The 1N5541BUR-1 is manufactured by Microchip Technology and does not specify Automotive grade or AEC-Q101 qualification in the available data. The VLZ22B-GS18 carries Automotive grade and AEC-Q101 qualification. For applications requiring automotive qualification, the TLZ22B-GS18 is preferred, though its automotive qualification status is not specified in the available data. Consult manufacturer datasheets for complete qualification information.

Q: What is the forward voltage difference at 200 mA?

A: The VLZ22B-GS18 specifies maximum forward voltage of 1.5 V at 200 mA. The TLZ22B-GS18 specifies 1.5 V at 200 mA (identical). The 1N5541BUR-1 specifies 1.1 V at 200 mA, representing a 0.4 V reduction. Lower forward voltage reduces power dissipation in forward-biased conditions and improves circuit efficiency.

Q: Why is the VLZ22B-GS18 classified as Obsolete?

A: The VLZ22B-GS18 is listed with Obsolete product status, indicating that the manufacturer has discontinued active production and support. Substitute parts with Active status (TLZ22B-GS18 and 1N5541BUR-1) ensure continued availability and supply chain reliability for new designs and ongoing production requirements.