VLZ36D-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ36D-GS18 is a Zener diode rated at 34.89 V nominal voltage with 500 mW power dissipation in a surface mount SOD-80 QuadroMELF package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Automotive grade with AEC-Q101 qualification. The part is currently listed as Obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement requirements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	34.89 V
Power - Max	500 mW
Impedance (Max) (Zzt)	75 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 32.3 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	SOD-80 Variant
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the obsolete VLZ36D-GS18 is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage rating within acceptable tolerance for the application
Maximum power dissipation capacity of 500 mW
Impedance specification of 75 Ohms maximum
Forward voltage characteristics at specified current levels
Operating temperature range of -65°C to 175°C

Mechanical & Compliance Equivalence Criteria:

Surface mount package compatibility (SOD-80 family)
Automotive grade classification
AEC-Q101 qualification
ROHS3 compliance
MSL rating of 1 (Unlimited)

The substitute part TLZ36D-GS18 meets these criteria with a nominal Zener voltage of 36 V, representing a 3.2% deviation from the original 34.89 V specification. Both parts share identical power ratings, impedance specifications, forward voltage characteristics, and operating temperature ranges. Both maintain Automotive grade status with AEC-Q101 qualification and ROHS3 compliance.

Parameter Comparison

Parameter	VLZ36D-GS18 (Main Part)	TLZ36D-GS18 (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	34.89 V	36 V
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	75 Ohms	75 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 32.3 V	40 nA @ 32.3 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 QuadroMELF	SOD-80 MiniMELF
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The TLZ36D-GS18 is the direct substitute for the obsolete VLZ36D-GS18. Both components are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical Automotive grade classification with AEC-Q101 qualification. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited).

The primary distinction between the parts is product status: VLZ36D-GS18 is Obsolete while TLZ36D-GS18 is Active, ensuring continued availability and supply chain support. The TLZ36D-GS18 demonstrates superior reverse leakage characteristics (40 nA versus 40 µA), indicating improved device quality and performance stability.

The nominal Zener voltage difference of 1.11 V (36 V versus 34.89 V) must be evaluated within the context of the specific application circuit. Both parts share identical electrical specifications for power dissipation, impedance, forward voltage, and operating temperature range. Package variants differ between QuadroMELF and MiniMELF configurations within the SOD-80 family, both suitable for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can TLZ36D-GS18 directly replace VLZ36D-GS18 in existing designs?

A: TLZ36D-GS18 is the designated substitute for the obsolete VLZ36D-GS18. Both parts share identical power ratings (500 mW), impedance specifications (75 Ohms), forward voltage characteristics (1.5 V @ 200 mA), and operating temperature range (-65°C to 175°C). Both maintain Automotive grade status with AEC-Q101 qualification. The 1.11 V difference in nominal Zener voltage (36 V versus 34.89 V) must be verified for circuit compatibility.

Q: What is the difference between SOD-80 QuadroMELF and SOD-80 MiniMELF packages?

A: Both are surface mount SOD-80 package variants. QuadroMELF and MiniMELF designations refer to different physical configurations within the SOD-80 family. The TLZ36D-GS18 uses MiniMELF configuration while the VLZ36D-GS18 uses QuadroMELF. Physical dimensions and PCB footprint requirements differ between these variants and must be verified for mechanical compatibility.

Q: Why is the reverse leakage current specification different between the two parts?

A: VLZ36D-GS18 specifies 40 µA reverse leakage current while TLZ36D-GS18 specifies 40 nA at 32.3 V. This represents a 1000-fold improvement in the substitute part, indicating enhanced device quality and lower leakage performance in the active TLZ36D-GS18 component.

Q: Are both parts compliant with automotive and environmental standards?

A: Both VLZ36D-GS18 and TLZ36D-GS18 are Automotive grade components with AEC-Q101 qualification. Both are ROHS3 compliant and REACH unaffected. Both maintain MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: What is the availability status of these components?

A: VLZ36D-GS18 is classified as Obsolete. TLZ36D-GS18 is classified as Active, ensuring ongoing manufacturing support and supply chain availability for new designs and production requirements.

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