VLZ56-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ56-GS18 is a Zener diode rated at 56.5 V nominal with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount 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 that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	56.5	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 50.4 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the VLZ56-GS18 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Zener voltage nominal rating within the application tolerance band
Maximum power dissipation capacity of 500 mW or greater
Maximum impedance specification of 100 Ohms or less
Reverse leakage current characteristics suitable for the circuit application
Forward voltage drop at specified current conditions
Operating temperature range encompassing -65°C to 175°C

Mechanical Compatibility Criteria:

Surface mount package classification (SOD-80 family variants acceptable)
Automotive grade qualification with AEC-Q101 certification
RoHS3 compliance for regulatory alignment

The TLZ56-GS18 qualifies as a direct substitute based on matching electrical specifications and automotive qualification requirements, with the distinction of active product status and improved reverse leakage characteristics.

Parameter Comparison

Parameter	VLZ56-GS18	TLZ56-GS18	Match Status
Voltage - Zener (Nom)	56.5 V	56 V	Compatible
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	100 Ohms	100 Ohms	Identical
Current - Reverse Leakage @ Vr	40 µA @ 50.4 V	40 nA @ 50.4 V	Compatible (Improved)
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Identical
Operating Temperature Range	-65 to 175°C	-65 to 175°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	Compatible
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Improved

Engineering Selection Recommendations

The TLZ56-GS18 serves as the primary substitute for the obsolete VLZ56-GS18. Selection is based on the following engineering factors:

Electrical Equivalence: Both components maintain identical maximum power dissipation (500 mW), impedance specification (100 Ohms maximum), and forward voltage characteristics. The nominal Zener voltage differs by 0.5 V (56 V versus 56.5 V), which remains within typical circuit tolerance bands for high-voltage Zener applications. The TLZ56-GS18 demonstrates superior reverse leakage performance (40 nanoamperes versus 40 microamperes), representing a 1000-fold improvement in leakage characteristics.

Compliance and Qualification: Both components carry Automotive grade designation with AEC-Q101 qualification, ensuring suitability for automotive applications. Both maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current procurement and manufacturing.

Product Availability: The TLZ56-GS18 maintains active product status with 682 units in stock, providing supply continuity for the obsolete VLZ56-GS18 (869 units in stock). Active status ensures long-term availability and continued manufacturer support.

Package Consideration: Both components utilize SOD-80 surface mount packages. The VLZ56-GS18 employs QuadroMELF variant while the TLZ56-GS18 uses MiniMELF variant. Both are compatible with standard SOD-80 footprints in surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the TLZ56-GS18 directly replace the VLZ56-GS18 in existing designs?

A: Yes. Both components share identical electrical specifications for power dissipation, impedance, forward voltage, and operating temperature range. The 0.5 V difference in nominal Zener voltage (56 V versus 56.5 V) falls within standard circuit tolerance for high-voltage Zener applications. Both carry AEC-Q101 automotive qualification and ROHS3 compliance.

Q: What is the significance of the reverse leakage current difference?

A: The TLZ56-GS18 exhibits 40 nanoamperes reverse leakage compared to 40 microamperes in the VLZ56-GS18. This 1000-fold improvement reduces standby current consumption and heat generation, providing enhanced performance characteristics in the substitute component.

Q: Are the SOD-80 QuadroMELF and SOD-80 MiniMELF packages interchangeable?

A: Both variants conform to the SOD-80 surface mount package standard and are compatible with standard SOD-80 PCB footprints. Assembly equipment and reflow processes accommodate both variants without modification.

Q: Why is the VLZ56-GS18 listed as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. The TLZ56-GS18 represents the current active equivalent from the same manufacturer, providing continued access to functionally equivalent components.

Q: What certifications apply to both components?

A: Both the VLZ56-GS18 and TLZ56-GS18 carry AEC-Q101 automotive qualification, ROHS3 compliance, and REACH unaffected status. These certifications ensure suitability for automotive applications and compliance with current environmental and regulatory standards.

Q: Is the TLZ56-GS18 available in Tape & Reel packaging?

A: Yes. The TLZ56-GS18 is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. The VLZ56-GS18 packaging format is not specified in the provided data.

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