VLZ27B-GS18 Zener Diode Equivalent & Substitute Parts Reference

Part Overview

The VLZ27B-GS18 is an automotive-grade Zener diode from Vishay General Semiconductor - Diodes Division, featuring a nominal Zener voltage of 25.62 V, a maximum power rating of 500 mW, and surface-mount packaging (SOD-80 QuadroMELF). This part is classified as obsolete, creating a need to identify direct alternatives with matching or closely aligned electrical and mechanical parameters for ongoing design support and replacement.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	25.62 V
Power - Max	500 mW
Impedance (Max) (Zzt)	45 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 23.7 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

Substitute Part Grouping Explanation

Substitution candidates for the VLZ27B-GS18 Zener diode are grouped solely based on the following allowed and provided parameters: Zener voltage, maximum power, maximum impedance, reverse leakage current, forward voltage at specified current, operating temperature range, mounting type, package/case style, RoHS compliance, and automotive qualification. Only parts explicitly meeting or closely aligning with these key parameters can be considered direct substitutes.

Parameter Comparison

Parameter	VLZ27B-GS18	TLZ27B-GS18
Voltage - Zener (Nom) (Vz)	25.62 V	27 V
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 23.7 V	40 nA @ 23.7 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-80 Variant	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The VLZ27B-GS18 is obsolete, while the TLZ27B-GS18 is active and ROHS3 compliant. Both parts are surface-mount, automotive qualified, and have the same power rating, impedance, and forward voltage capability. The TLZ27B-GS18 offers a slightly higher Zener voltage and a significantly lower reverse leakage current at the same test voltage, matching all listed compliance and packaging criteria.

Frequently Asked Questions (FAQ)

Q1: What parameters are matched when identifying substitute Zener diodes?
A1: Substitution is based only on Zener voltage, power rating, impedance, reverse leakage current, forward voltage at specified current, operating temperature range, mounting type, package/case compatibility, and compliance or qualification status.

Q2: Can the TLZ27B-GS18 directly replace the VLZ27B-GS18 in existing designs?
A2: The TLZ27B-GS18 matches all critical listed parameters except for a slightly higher nominal Zener voltage. Package, mounting, power, and compliance parameters align as provided.

Q3: Are there differences in the package style between VLZ27B-GS18 and TLZ27B-GS18?
A3: Both utilize SOD-80 class surface-mount packages. The main part uses SOD-80 QuadroMELF, while the substitute is specified as SOD-80 MiniMELF; these package styles are documented as comparable within the input data.

Q4: How is component qualification considered in this substitution?
A4: Both the VLZ27B-GS18 and TLZ27B-GS18 are specified as meeting automotive grade requirements and are AEC-Q101 qualified.

Q5: What compliance statuses are supported by both parts?
A5: Both parts are ROHS3 compliant and REACH unaffected, with MSL 1 (unlimited floor life) as noted in the provided data.

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