VLZ30-GS18 Equivalent & Substitute Parts Reference

Part Overview

The VLZ30-GS18 from Vishay General Semiconductor - Diodes Division is a Zener diode, part of the VLZ series, with a nominal Zener voltage of 30 V and a maximum power dissipation of 500 mW. It is designed for automotive-grade applications and qualified to AEC-Q101 standards. The component has reached obsolete status, making it necessary to identify equivalent or substitute parts that can perform the same electrical and mechanical functions.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	30 V
Power - Max	500 mW
Impedance (Max) (Zzt)	55 Ohms
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
Supplier Device Package	SOD-80 QuadroMELF
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Equivalent and substitute parts for a Zener diode in this product category are identified based on the following strictly defined key parameters: nominal Zener voltage (Vz), maximum power dissipation, maximum impedance (Zzt), forward voltage at specified current, operating temperature range, surface-mount package compatibility, automotive grade, qualification (such as AEC-Q101), RoHS status, and other compliance information. Only parts matching or surpassing these characteristics within defined limits qualify as substitutes.

Parameter Comparison

Parameter	Main Part: VLZ30-GS18	Substitute: TLZ30-GS18
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	30 V	30 V
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	55 Ohms	80 Ohms
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
Supplier Device Package	SOD-80 QuadroMELF	SOD-80 MiniMELF
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Selection between VLZ30-GS18 and TLZ30-GS18 can be based on product availability and compliance status. VLZ30-GS18 is obsolete, whereas TLZ30-GS18 remains active. Both parts are ROHS3 compliant and unaffected by REACH requirements, with moisture sensitivity level 1 (unlimited shelf life), providing alignment with environmental and handling standards.

Frequently Asked Questions (FAQ)

Q1: On what basis can TLZ30-GS18 be used as a substitute for VLZ30-GS18 in a design?
A1: TLZ30-GS18 can be used as a substitute strictly because key electrical parameters such as nominal Zener voltage (30 V), maximum power dissipation (500 mW), forward voltage at 200 mA (1.5 V), operating temperature range (-65°C ~ 175°C), mounting type (surface mount), and compliance standards are aligned.

Q2: Are the package types between VLZ30-GS18 and TLZ30-GS18 compatible?
A2: Both products use surface-mount SOD-80-compatible packages; VLZ30-GS18 features SOD-80 QuadroMELF and TLZ30-GS18 features SOD-80 MiniMELF. Compatibility is determined strictly by matching SOD-80 footprint requirements as specified.

Q3: Does the difference in maximum impedance (Zzt) between the two parts restrict substitution?
A3: Both impedance values are specified for this product category and parameter use. Substitution is based only on the allowable range of the parameter as provided.

Q4: What compliance requirements are relevant for selecting a substitute Zener diode?
A4: The relevant compliance requirements explicitly provided and observed are ROHS3 compliance, REACH unaffected status, and AEC-Q101 automotive qualification. Both VLZ30-GS18 and TLZ30-GS18 satisfy these criteria.

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