VLZ39C-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ39C-GS18 is a Zener diode rated at 36.93 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 continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36.93	V
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 34.2 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount
Package / Case	SOD-80
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the VLZ39C-GS18 is determined by the following critical parameters:

Electrical Compatibility:

Zener voltage nominal rating within acceptable circuit tolerance
Maximum power dissipation capacity of 500 mW
Impedance specification of 85 Ohms maximum
Forward voltage characteristic of 1.5 V maximum at 200 mA
Operating temperature range of -65°C to 175°C

Mechanical & Packaging Compatibility:

Surface mount mounting type
SOD-80 package footprint compatibility

Compliance & Quality:

Automotive grade classification
AEC-Q101 qualification
ROHS3 compliance
MSL rating of 1 (Unlimited)

The substitute part TLZ39C-GS18 meets these criteria with the following considerations: the nominal Zener voltage is 39 V (compared to 36.93 V), representing a 1.9% deviation. All other electrical parameters, operating temperature range, mounting type, package designation, and compliance certifications remain equivalent or superior to the original part.

Parameter Comparison

Parameter	VLZ39C-GS18	TLZ39C-GS18	Unit
Voltage - Zener (Nom)	36.93	39	V
Power - Max	500	500	mW
Impedance (Max)	85	85	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 34.2 V	40 nA @ 34.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 @ 200 mA	1.5 @ 200 mA	V
Operating Temperature Range	-65 to 175	-65 to 175	°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The TLZ39C-GS18 is the direct substitute for the obsolete VLZ39C-GS18. Selection is based on the following engineering factors:

Product Status: The TLZ39C-GS18 maintains Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete VLZ39C-GS18.

Compliance & Certification: Both parts maintain identical compliance profiles: ROHS3 compliance, AEC-Q101 automotive qualification, and MSL rating of 1 (Unlimited). This ensures no degradation in regulatory or quality requirements.

Electrical Parameters: The substitute part delivers equivalent electrical performance across all critical specifications. The nominal Zener voltage difference of 2.07 V (39 V versus 36.93 V) must be evaluated within the context of circuit design tolerance. Reverse leakage current is superior in the substitute (40 nA versus 40 µA), representing a 1000-fold improvement in leakage performance.

Package Compatibility: Both parts utilize SOD-80 surface mount packages. The QuadroMELF variant of the original part and the MiniMELF variant of the substitute are both SOD-80 designations. Physical footprint compatibility must be confirmed against PCB layout specifications.

Procurement: The TLZ39C-GS18 is available in Tape & Reel packaging with confirmed inventory of 1168 pieces, supporting production requirements.

Frequently Asked Questions (FAQ)

Q: Can the TLZ39C-GS18 directly replace the VLZ39C-GS18 in existing designs?

A: The TLZ39C-GS18 is electrically and mechanically compatible with the VLZ39C-GS18 across all specified parameters. Both parts are surface mount SOD-80 devices with identical power ratings, impedance specifications, and operating temperature ranges. Circuit design tolerance for the 2.07 V Zener voltage difference must be confirmed for the specific application.

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

A: Both designations refer to the SOD-80 package standard. The QuadroMELF and MiniMELF variants represent different physical implementations within the SOD-80 specification. PCB footprint compatibility must be verified against design documentation to ensure proper component placement and soldering.

Q: Why is the reverse leakage current significantly lower in the TLZ39C-GS18?

A: The TLZ39C-GS18 exhibits reverse leakage current of 40 nanoamperes compared to 40 microamperes in the VLZ39C-GS18. This 1000-fold reduction represents improved device performance and is a result of manufacturing process differences between the VLZ and TLZ series. This improvement does not negatively impact circuit performance.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the VLZ39C-GS18 and TLZ39C-GS18 carry Automotive grade classification and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: What is the significance of the Active product status for the TLZ39C-GS18?

A: Active product status indicates that the TLZ39C-GS18 is currently manufactured and supported by Vishay General Semiconductor - Diodes Division. This ensures ongoing availability, consistent supply chain access, and manufacturer technical support, contrasting with the Obsolete status of the VLZ39C-GS18.

Q: Are there any moisture sensitivity concerns with these parts?

A: Both parts carry MSL rating 1 (Unlimited), indicating no moisture sensitivity limitations. These components can be stored and handled without moisture barrier packaging requirements or bake-out procedures prior to soldering.

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