VLZ39G-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ39G-GS18 is a Zener diode rated at 39.87 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 qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

The VLZ39G-GS18 carries an Obsolete product status. Identification of equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39.87	V
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 37 V	µA
Voltage - Forward (Vf) (Max) @ If	1.5 @ 200 mA	V
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount
Package / Case	SOD-80
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the VLZ39G-GS18 is determined by the following critical parameters:

Electrical Specifications:

Zener voltage nominal rating within the 39 V to 39.87 V range
Maximum power dissipation of 500 mW
Maximum impedance of 85 Ohms
Forward voltage maximum of 1.5 V at 200 mA
Operating temperature range of -65°C to 175°C

Mechanical & Package Requirements:

Surface mount technology
SOD-80 package variant compatibility

Compliance & Qualification:

Automotive grade classification
AEC-Q101 qualification
ROHS3 compliance
REACH unaffected status

The substitute part TLZ39G-GS18 meets all critical electrical parameters, maintains automotive qualification, and operates within the specified temperature range. Both parts share identical power ratings, impedance specifications, and forward voltage characteristics. The primary distinction is the zener voltage nominal value (39 V versus 39.87 V) and reverse leakage current specification, which remain within acceptable substitution tolerances for this component category.

Parameter Comparison

Parameter	VLZ39G-GS18	TLZ39G-GS18	Unit
Voltage - Zener (Nom)	39.87	39	V
Power - Max	500	500	mW
Impedance (Max)	85	85	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 37 V	40 nA @ 37 V	µA / nA
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
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The TLZ39G-GS18 serves as a direct functional substitute for the obsolete VLZ39G-GS18. Both components maintain identical automotive qualification under AEC-Q101 standards and comply with ROHS3 environmental requirements. The substitute part carries Active product status, ensuring continued availability and supply chain support.

The zener voltage differential of 0.87 V (39 V nominal versus 39.87 V nominal) falls within standard tolerance bands for zener diode specifications and does not preclude substitution in voltage regulation applications. The reverse leakage current improvement in the TLZ39G-GS18 (40 nA versus 40 µA) represents enhanced performance characteristics.

Both components share identical electrical performance in power dissipation, impedance, and forward voltage specifications. The package variant difference (QuadroMELF versus MiniMELF) requires verification of PCB layout compatibility and land pattern alignment, as both utilize the SOD-80 form factor but may differ in physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can the TLZ39G-GS18 directly replace the VLZ39G-GS18 in existing designs?

A: The TLZ39G-GS18 is electrically compatible with the VLZ39G-GS18 across all critical parameters including power rating, impedance, and operating temperature range. Both components maintain AEC-Q101 automotive qualification. PCB layout verification is required to confirm compatibility between SOD-80 QuadroMELF and SOD-80 MiniMELF package variants.

Q: What is the significance of the zener voltage difference between these parts?

A: The VLZ39G-GS18 specifies 39.87 V nominal zener voltage while the TLZ39G-GS18 specifies 39 V nominal. This 0.87 V difference is within standard zener diode tolerance specifications and does not prevent substitution for voltage regulation applications. Circuit design margins should be evaluated for applications with tight voltage tolerance requirements.

Q: Are both parts suitable for automotive applications?

A: Both the VLZ39G-GS18 and TLZ39G-GS18 carry Automotive grade classification and AEC-Q101 qualification. The TLZ39G-GS18 maintains Active product status, providing continued support for automotive production environments.

Q: What packaging considerations apply to this substitution?

A: Both components utilize SOD-80 surface mount packages. The VLZ39G-GS18 employs QuadroMELF variant packaging while the TLZ39G-GS18 uses MiniMELF variant packaging. Physical dimensions and land pattern specifications may differ between these variants. PCB design files and component datasheets must be consulted to verify footprint compatibility before implementation.

Q: Does the reverse leakage current difference affect circuit performance?

A: The TLZ39G-GS18 exhibits lower reverse leakage current (40 nA) compared to the VLZ39G-GS18 (40 µA). This represents improved performance characteristics and does not negatively impact substitution. Applications sensitive to leakage current benefit from the enhanced specification of the substitute part.

Q: Are compliance and environmental certifications equivalent between these parts?

A: Both components comply with ROHS3 requirements and carry REACH unaffected status. Moisture sensitivity level is rated as 1 (Unlimited) for both parts. Environmental and regulatory compliance is equivalent between the VLZ39G-GS18 and TLZ39G-GS18.

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