VLZ39B-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ39B-GS08 is a Zener Diode rated at 36.28 V 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 Obsolete, with 868 pieces currently in stock. The part qualifies for Automotive applications under AEC-Q101 certification and is ROHS3 compliant.

Due to the Obsolete product status, equivalent and substitute parts are necessary to ensure continued design support, procurement availability, and long-term supply chain reliability for new production runs and design revisions.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	36.28	V
Power - Maximum	500	mW
Impedance (Maximum)	85	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 33.6 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-80 QuadroMELF	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitute parts for the VLZ39B-GS08 are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Zener voltage within acceptable tolerance of 36.28 V nominal
Power dissipation rating of 500 mW
Surface Mount package configuration (SOD-80 family)
Operating temperature range compatibility (-65°C to 175°C minimum)
Automotive-grade qualification or equivalent reliability standard

Secondary Compatibility Factors:

Impedance (Maximum) at or below 85 Ohms
Reverse leakage current characteristics
Forward voltage characteristics
RoHS3 compliance status

The substitute parts identified maintain electrical performance within the specified operating envelope while accommodating variations in packaging designation (QuadroMELF versus MiniMELF) and manufacturer implementation.

Parameter Comparison

Parameter	VLZ39B-GS08 (Main)	TLZ39B-GS08 (Substitute)	BZV55-B36,115 (Substitute)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	NXP Semiconductors
Voltage - Zener (Nominal)	36.28 V	39 V	36 V
Power - Maximum	500 mW	500 mW	500 mW
Impedance (Maximum)	85 Ohms	85 Ohms	90 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 33.6 V	40 nA @ 33.6 V	50 nA @ 700 mV
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	900 mV @ 10 mA
Operating Temperature Range	-65 to 175 °C	-65 to 175 °C	-65 to 200 °C
Product Status	Obsolete	Active	Active
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	SOD-80 MiniMELF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TLZ39B-GS08 (Vishay General Semiconductor - Diodes Division)

The TLZ39B-GS08 is the primary substitute for the VLZ39B-GS08. Both components are manufactured by Vishay within the same product family (VLZ/TLZ series) and share identical electrical specifications for power rating (500 mW), impedance (85 Ohms), and forward voltage characteristics. The TLZ39B-GS08 maintains Active product status with significantly higher inventory availability (10,300 pieces). The zener voltage nominal of 39 V represents a 2.72 V increase from the main part, which falls within acceptable tolerance for most circuit applications. Both parts maintain identical operating temperature range (-65°C to 175°C) and RoHS3 compliance. The primary difference is the package variant designation (MiniMELF versus QuadroMELF), which represents a physical footprint variation within the SOD-80 family. Packaging in Tape & Reel format supports automated assembly processes.

BZV55-B36,115 (NXP Semiconductors)

The BZV55-B36,115 is a secondary substitute manufactured by NXP Semiconductors. This component matches the primary zener voltage specification at 36 V nominal with ±2% tolerance specification, providing closer voltage alignment to the original 36.28 V rating. Power dissipation (500 mW) and impedance (90 Ohms maximum) remain compatible. The BZV55-B36,115 extends the operating temperature range to 200°C, exceeding the original specification. Reverse leakage current is specified at 50 nA, representing improved leakage characteristics compared to the main part. The component is available in high volume (773,458 pieces) in bulk packaging. Forward voltage specification differs due to measurement at different current levels (900 mV @ 10 mA versus 1.5 V @ 200 mA). This part is suitable for applications where voltage tolerance and leakage performance are critical design parameters.

Frequently Asked Questions (FAQ)

Q: Can the TLZ39B-GS08 directly replace the VLZ39B-GS08 in existing designs?

A: The TLZ39B-GS08 is electrically compatible for most applications. The zener voltage difference of 2.72 V (39 V versus 36.28 V) must be evaluated within the specific circuit context. Both parts share identical power rating, impedance, and operating temperature specifications. The package variant (MiniMELF versus QuadroMELF) represents a physical footprint change that requires PCB layout verification.

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

A: Both designations refer to the SOD-80 package family for surface mount diodes. QuadroMELF and MiniMELF represent different physical footprint implementations within this package standard. Component selection must account for PCB pad layout compatibility and available board space.

Q: Is the BZV55-B36,115 suitable for Automotive applications?

A: The BZV55-B36,115 specifications do not include explicit Automotive grade or AEC-Q101 qualification data in the provided parameters. The TLZ39B-GS08 maintains Automotive grade classification identical to the original VLZ39B-GS08. For Automotive applications requiring AEC-Q101 certification, the TLZ39B-GS08 is the recommended substitute.

Q: How does the reverse leakage current difference affect circuit performance?

A: The VLZ39B-GS08 specifies 40 µA reverse leakage at 33.6 V, while both substitute parts specify leakage in the nanoampere range (40 nA and 50 nA respectively). Lower leakage current in substitute parts represents improved performance characteristics that reduce standby power consumption and heat generation in the zener diode.

Q: What inventory considerations apply to these substitute parts?

A: The VLZ39B-GS08 (Obsolete status) has 868 pieces in stock. The TLZ39B-GS08 (Active status) has 10,300 pieces available in Tape & Reel packaging. The BZV55-B36,115 (Active status) has 773,458 pieces available in bulk packaging. For long-term supply chain planning, Active status parts with higher inventory levels provide greater procurement flexibility.

Q: Are all three parts RoHS3 compliant?

A: The VLZ39B-GS08 and TLZ39B-GS08 are explicitly specified as ROHS3 compliant. The BZV55-B36,115 RoHS status is not specified in the provided parameters. For applications requiring RoHS3 compliance verification, the Vishay parts (VLZ39B-GS08 and TLZ39B-GS08) provide documented compliance.

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