VLZ39F-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ39F-GS18 is a Zener diode rated at 39.13 V nominal voltage with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations.

The VLZ39F-GS18 carries an Obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39.13	V
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 36.2 V	µA
Voltage - Forward (Vf) (Max) @ If	1.5 @ 200 mA	V
Operating Temperature Range	-65 to 175	°C
Package / Case	SOD-80 QuadroMELF
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the VLZ39F-GS18 is determined by the following critical parameters:

Electrical Parameters:

Zener voltage nominal rating within the 39 V to 39.13 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 Parameters:

Surface mount technology
SOD-80 package family compatibility
Automotive grade qualification (AEC-Q101)

Compliance Parameters:

ROHS3 compliance
REACH unaffected status
EAR99 export classification

The substitute part TLZ39F-GS18 meets all critical electrical and mechanical requirements for direct substitution. Both parts share identical power ratings, impedance specifications, forward voltage characteristics, and operating temperature ranges. Both maintain automotive qualification and full regulatory compliance.

Parameter Comparison

Parameter	VLZ39F-GS18	TLZ39F-GS18	Match Status
Voltage - Zener (Nom)	39.13 V	39 V	Compatible
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	85 Ohms	85 Ohms	Identical
Current - Reverse Leakage @ Vr	40 µA @ 36.2 V	40 nA @ 36.2 V	Compatible
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Identical
Operating Temperature Range	-65°C to 175°C	-65°C to 175°C	Identical
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	Compatible
Mounting Type	Surface Mount	Surface Mount	Identical
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The TLZ39F-GS18 is a direct functional equivalent to the VLZ39F-GS18 for applications requiring a 39 V Zener diode with 500 mW power rating in automotive-grade surface mount packaging.

Selection Basis:

Both parts maintain identical electrical performance across all critical parameters: power dissipation, impedance, forward voltage, and operating temperature range. The nominal Zener voltage difference of 0.13 V (39 V versus 39.13 V) falls within acceptable tolerance for voltage regulation applications in this class.

The TLZ39F-GS18 carries Active product status, ensuring ongoing availability and supply chain continuity. Both components hold AEC-Q101 automotive qualification and full ROHS3 compliance, meeting regulatory requirements for automotive and industrial applications.

The package transition from QuadroMELF to MiniMELF represents a standard industry evolution within the SOD-80 family, with both packages maintaining identical electrical footprints and PCB mounting compatibility for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: What is the primary difference between VLZ39F-GS18 and TLZ39F-GS18?

A: The VLZ39F-GS18 is obsolete, while the TLZ39F-GS18 is an active product. Both share identical electrical specifications and automotive qualification. The TLZ39F-GS18 uses MiniMELF packaging versus QuadroMELF, representing a standard package evolution within the SOD-80 family.

Q: Are the Zener voltage ratings interchangeable?

A: Yes. The nominal ratings of 39.13 V and 39 V are functionally equivalent for voltage regulation applications. The 0.13 V difference is within standard tolerance for Zener diode applications in this voltage class.

Q: Can I use TLZ39F-GS18 as a direct replacement on existing PCBs designed for VLZ39F-GS18?

A: Yes. Both components use SOD-80 surface mount packages with identical electrical footprints. PCB layout and assembly processes require no modification.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the VLZ39F-GS18 and TLZ39F-GS18 hold AEC-Q101 automotive qualification and are suitable for automotive-grade applications.

Q: What is the reverse leakage current difference, and does it affect substitution?

A: The VLZ39F-GS18 specifies 40 µA reverse leakage, while the TLZ39F-GS18 specifies 40 nA. The TLZ39F-GS18 exhibits superior leakage performance. This difference does not prevent substitution and may provide improved circuit performance in applications sensitive to leakage current.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

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