VLZ20B-GS08 Equivalent & Substitute Parts Reference

Part Overview

The VLZ20B-GS08 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division. It features a nominal Zener voltage of 19.11 V, 500 mW power dissipation, and an automotive grade qualification, supplied in a SOD-80 QuadroMELF surface-mount package. As this product is classified as obsolete, it is necessary to identify substitute models with matching key electrical and mechanical parameters for continued design support and maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	VLZ20B-GS08
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	19.11 V
Power - Max	500 mW
Impedance (Max) (Zzt)	28 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 17.1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	SOD-80 Variant
RoHS Status	ROHS3 Compliant
Qualification	AEC-Q101
Part Status	Obsolete

Substitute Part Grouping Explanation

Substitute selection for Zener diodes is determined by matching essential electrical and mechanical parameters: Nominal Zener voltage, maximum power dissipation, maximum impedance, reverse leakage current, forward voltage, operating temperature range, mounting type, and package. Only components with all these criteria explicitly specified can be considered as substitutes. Compliance with RoHS and AEC-Q101 is also noted but only included according to direct documentation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Category	Voltage - Zener (Nom) (Vz)	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Qualification	Part Status
VLZ20B-GS08	Vishay General Semiconductor	Diodes, Zener	19.11 V	500 mW	28 Ohms	40 µA @ 17.1 V	1.5 V @ 200 mA	-65°C ~ 175°C	Surface Mount	SOD-80 Variant	ROHS3 Compliant	AEC-Q101	Obsolete
TLZ20B-GS08	Vishay General Semiconductor	Diodes, Zener	20 V	500 mW	28 Ohms	40 nA @ 17.7 V	1.5 V @ 200 mA	-65°C ~ 175°C	Surface Mount	SOD-80 MiniMELF	ROHS3 Compliant	-	Active
1N4114UR-1	Microchip Technology	Diodes, Zener	20 V	500 mW	150 Ohms	10 nA @ 15.2 V	1.1 V @ 200 mA	-65°C ~ 175°C (TA)	Surface Mount	DO-213AA	-	-	Active
1N5540BUR-1	Microchip Technology	Diodes, Zener	20 V	500 mW	100 Ohms	10 nA @ 18 V	1.1 V @ 200 mA	-65°C ~ 175°C (TJ)	Surface Mount	DO-213AA	RoHS non-compliant	-	Active

Engineering Selection Recommendations

As the VLZ20B-GS08 is obsolete, selection of substitute parts is based on equivalent electrical ratings and matching mounting/package types for direct mechanical interchange. TLZ20B-GS08 provides ROHS3 compliance but does not include AEC-Q101 qualification documentation in the provided data. 1N4114UR-1 and 1N5540BUR-1 have similar electrical ratings but are not specified as RoHS compliant and may feature package differences. Only parameters specified in the source documentation are considered for equivalency—no additional certifications are implied beyond this data.

Frequently Asked Questions (FAQ)

Q: On what basis are substitute Zener diodes selected for VLZ20B-GS08?
A: Selection is strictly based on nominal Zener voltage, power rating, maximum impedance, reverse leakage current, forward voltage at rated current, operating temperature range, surface-mount package, and compliance status.

Q: Can a substitute part be used without concern for electrical variations?
A: Substitutes must match all explicitly listed parameters; check the comparison table for voltage, power, and impedance values.

Q: Are the package types of substitutes identical to VLZ20B-GS08?
A: TLZ20B-GS08 is specified with SOD-80 MiniMELF, VLZ20B-GS08 with SOD-80 QuadroMELF; Microchip alternatives specify DO-213AA. Mechanical differences should be reviewed if the footprint is critical.

Q: Do substitute parts hold the same compliance and qualification status?
A: Only TLZ20B-GS08 is indicated as ROHS3 compliant. Qualification status (e.g., AEC-Q101) is only considered if listed in the data.

Q: Is there a difference in the part status between the main and substitute parts?
A: VLZ20B-GS08 is obsolete. All listed substitutes are marked 'Active' in provided information.

Q: Does the reverse leakage current vary among substitutes?
A: Yes. Refer to the table for specific leakage current values at given test voltages for each part.

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