VLZ3V9B-GS08 Equivalent & Substitute Parts Reference

Part Overview

The VLZ3V9B-GS08 by Vishay General Semiconductor - Diodes Division is a Zener diode rated at 4.03 V nominal Zener voltage and 500 mW maximum power dissipation, supplied in a SOD-80 QuadroMELF package, and specified for automotive applications with AEC-Q101 qualification. This part is currently obsolete, making direct procurement increasingly difficult. Sourcing alternative models with equivalent electrical and mechanical characteristics is essential to ensure continued product maintenance and new production compatibility.

Key Parameters

Parameter	VLZ3V9B-GS08 Value
Voltage - Zener (Nom) (Vz)	4.03 V
Power - Max	500 mW
Impedance (Max) (Zzt)	50 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 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
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution is based on the following key parameters: Zener voltage, maximum power dissipation, maximum impedance, reverse leakage current, forward voltage, operating temperature, package type, mounting style, RoHS status, and qualification (AEC-Q101). Substitutes are listed only if these parameters match or fall within the limits stated for the VLZ3V9B-GS08, and if the package and mounting are compatible. Compliance statuses and part availability are also considered.

Parameter Comparison

Parameter	VLZ3V9B-GS08	TLZ3V9B-GS08	1N748AUR-1
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom) (Vz)	4.03 V	3.9 V	3.9 V
Power - Max	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	50 Ohms	50 Ohms	20 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 1 V	3 µA @ 1 V	2 µA @ 1 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 Variant	DO-213AC, MINI-MELF, SOD-80	DO-213AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Qualification	AEC-Q101	-	-
MSL	1 (Unlimited)	1 (Unlimited)	-
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The VLZ3V9B-GS08 is obsolete. The TLZ3V9B-GS08 is active, is RoHS compliant, and available in Tape & Reel packaging formats, providing direct mechanical and electrical compatibility except for a slightly lower Zener voltage rating (3.9 V). The 1N748AUR-1 is active, has RoHS non-compliance, a matching electrical profile with a slightly lower Zener voltage (3.9 V), and a different package outline (DO-213AA). For automotive or compliance-critical designs, selection should confirm requirements such as RoHS status and AEC-Q101 qualification.

Frequently Asked Questions (FAQ)

Q1: What are the primary criteria for selecting a substitute for VLZ3V9B-GS08?
A1: Substitution requires matching Zener voltage, power rating, maximum impedance, reverse leakage current, forward voltage, mechanical package, mounting type, operating temperature, and regulatory compliance statuses.

Q2: Are the TLZ3V9B-GS08 and 1N748AUR-1 pin-compatible with VLZ3V9B-GS08?
A2: Both substitutes are surface-mount, compatible with SOD-80/DO-213AC/DO-213AA outlines. Verify exact pad compatibility based on package footprint specification.

Q3: What compliance differences exist between these parts?
A3: VLZ3V9B-GS08 and TLZ3V9B-GS08 are ROHS3 compliant and REACH unaffected. 1N748AUR-1 is RoHS non-compliant.

Q4: How critical is AEC-Q101 qualification?
A4: VLZ3V9B-GS08 is AEC-Q101 qualified. Neither TLZ3V9B-GS08 nor 1N748AUR-1 lists AEC-Q101; confirm qualification requirements for safety or automotive use.

Q5: What are the package differences?
A5: The main part uses SOD-80 QuadroMELF; TLZ3V9B-GS08 uses SOD-80 MiniMELF (DO-213AC); 1N748AUR-1 uses DO-213AA. Ensure PCB and assembly process compatibility.

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