Equivalent & Substitute Parts Reference for VLZ33-GS18

Part Overview

VLZ33-GS18 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, categorized under Diodes, Zener. It features a Zener voltage of 33 V, a maximum power dissipation of 500 mW, and is housed in a surface mount SOD-80 QuadroMELF package. The product is qualified to automotive standards (AEC-Q101), suitable for high-reliability requirements, and is RoHS3 compliant with moisture sensitivity level 1. As VLZ33-GS18 is obsolete, it is necessary to identify substitute components based strictly on electrical, mechanical, and compliance parameters supported in this product category.

Key Parameters

Parameter	VLZ33-GS18 Value
Manufacturer Part Number	VLZ33-GS18
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	33 V
Power - Max	500 mW
Impedance (Max) (Zzt)	65 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
Product Status	Obsolete
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts are selected based strictly on the following key parameters: Zener voltage, power rating, maximum impedance, forward voltage at test current, operating temperature range, mounting type, package compatibility, AEC-Q101 qualification, RoHS compliance, moisture sensitivity level, and REACH status. Only substitute parts matching all these criteria and specified by manufacturer documentation in the category "Diodes, Zener" are included. No parameters outside those listed are considered.

Parameter Comparison

Parameter	VLZ33-GS18	TLZ33-GS18
Manufacturer Part Number	VLZ33-GS18	TLZ33-GS18
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	33 V	33 V
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	65 Ohms	65 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
Product Status	Obsolete	Active
Qualification	AEC-Q101	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Selection between VLZ33-GS18 and TLZ33-GS18 can be made based on product availability and status. VLZ33-GS18 is obsolete, while TLZ33-GS18 is active and available. Both parts are ROHS3 compliant, AEC-Q101 qualified, and have identical electrical and mechanical parameters as per the provided data. Moisture sensitivity and REACH status are also matched.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must match for a Zener diode substitute?
A1: Key parameters are Zener voltage, maximum power dissipation, maximum impedance, and forward voltage at the specified test current.

Q2: How important is package compatibility in substitution?
A2: Substitutes must have equivalent surface mount packages. VLZ33-GS18 uses SOD-80 Variant, while TLZ33-GS18 uses DO-213AC, MINI-MELF, SOD-80. Both are compatible within the specified physical criteria.

Q3: Is AEC-Q101 qualification required for substitute selection in automotive applications?
A3: AEC-Q101 qualification is maintained for both VLZ33-GS18 and TLZ33-GS18, supporting comparable reliability standards.

Q4: Do RoHS and REACH statuses affect substitution?
A4: Both main and substitute parts are ROHS3 compliant and REACH unaffected, meeting restricted substance requirements.

Q5: What is the significance of product status in engineering selection?
A5: VLZ33-GS18 is obsolete and not recommended for new designs; TLZ33-GS18 is active, supporting ongoing production needs.

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