VLZ47-GS18 Equivalent & Substitute Parts

Part Overview

The VLZ47-GS18 is a Zener diode rated at 46.5 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is packaged in SOD-80 QuadroMELF surface mount configuration and is qualified to AEC-Q101 automotive standards. The product is currently classified as obsolete, necessitating identification of equivalent substitute components that maintain functional and electrical compatibility for ongoing applications and new designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	46.5	V
Power - Max	500	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 41.8 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

Substitute Part Grouping Explanation

Substitution of the VLZ47-GS18 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Zener voltage nominal rating within acceptable circuit tolerance
Power dissipation capacity of 500 mW minimum
Impedance (Zzt) maximum of 90 Ohms
Reverse leakage current characteristics
Forward voltage drop at specified current
Operating temperature range of -65°C to 175°C

Mechanical & Packaging Criteria:

Surface mount configuration
SOD-80 package family compatibility
Automotive grade qualification (AEC-Q101)
RoHS3 compliance
Moisture sensitivity level MSL 1

The TLZ47-GS18 qualifies as a direct substitute based on matching electrical specifications, automotive qualification, and surface mount SOD-80 packaging, with the primary distinction being the nominal Zener voltage of 47 V versus 46.5 V and improved reverse leakage characteristics.

Parameter Comparison

Parameter	VLZ47-GS18	TLZ47-GS18	Unit
Voltage - Zener (Nom)	46.5	47	V
Power - Max	500	500	mW
Impedance (Max)	90	90	Ohms
Current - Reverse Leakage @ Vr	40 µA @ 41.8 V	40 nA @ 41.8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA
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
MSL	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The TLZ47-GS18 is the qualified substitute for the obsolete VLZ47-GS18 based on the following factors:

Product Status: The TLZ47-GS18 maintains active product status with current manufacturing and distribution, ensuring long-term availability and supply chain continuity compared to the obsolete VLZ47-GS18.

Compliance & Certification: Both components carry identical automotive grade qualification (AEC-Q101) and ROHS3 compliance, meeting regulatory and environmental requirements for automotive and industrial applications.

Electrical Performance: The TLZ47-GS18 delivers equivalent power dissipation (500 mW) and impedance characteristics (90 Ohms maximum). The nominal Zener voltage difference of 0.5 V (47 V versus 46.5 V) falls within standard circuit tolerance bands for voltage regulation applications. The TLZ47-GS18 exhibits superior reverse leakage performance (40 nA versus 40 µA), reducing standby current consumption.

Thermal & Environmental: Identical operating temperature range (-65°C to 175°C) and moisture sensitivity level (MSL 1) ensure equivalent performance across environmental conditions.

Packaging Consideration: Both components utilize SOD-80 surface mount packages. The TLZ47-GS18 employs MiniMELF variant while the VLZ47-GS18 uses QuadroMELF variant. Both are compatible with standard surface mount assembly processes and PCB footprints designed for SOD-80 packages.

Frequently Asked Questions (FAQ)

Q: Can the TLZ47-GS18 directly replace the VLZ47-GS18 in existing designs?

A: Yes. The TLZ47-GS18 meets all electrical and mechanical substitution criteria. The 0.5 V nominal voltage difference (47 V versus 46.5 V) is within standard circuit tolerance for Zener diode applications. Both components share identical power ratings, impedance specifications, operating temperature ranges, and automotive qualifications.

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

A: The TLZ47-GS18 exhibits reverse leakage of 40 nanoamperes compared to 40 microamperes in the VLZ47-GS18, representing a 1000-fold improvement. This reduces standby power consumption and improves circuit efficiency, particularly in battery-powered or low-power applications.

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

A: Both variants are SOD-80 surface mount packages compatible with standard PCB footprints and assembly equipment. The MiniMELF variant used in the TLZ47-GS18 is a recognized industry standard for this package family and presents no compatibility issues with existing designs.

Q: Does the TLZ47-GS18 maintain automotive qualification?

A: Yes. The TLZ47-GS18 carries AEC-Q101 qualification identical to the VLZ47-GS18, meeting automotive industry reliability and performance standards.

Q: Why is the VLZ47-GS18 classified as obsolete?

A: Manufacturer product lifecycle decisions result in obsolescence. The active TLZ47-GS18 provides equivalent functionality with improved electrical characteristics and ongoing supply availability.

Q: What packaging format is available for the TLZ47-GS18?

A: The TLZ47-GS18 is supplied in Tape & Reel (TR) format, standard for high-volume surface mount component distribution and automated assembly processes.

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