VLZ27B-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ27B-GS08 is a Zener Diode rated at 25.62 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, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The part carries Automotive grade qualification (AEC-Q101) and is ROHS3 compliant.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	25.62 V
Power - Max	500 mW
Impedance (Max) (Zzt)	45 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 23.7 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	SOD-80 Variant
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the VLZ27B-GS08 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage rating within acceptable tolerance for the application circuit
Maximum power dissipation capacity of 500 mW
Impedance specification of 45 Ohms maximum
Operating temperature range of -65°C to 175°C
Forward voltage characteristic of 1.5 V maximum at 200 mA

Mechanical & Packaging Criteria:

Surface Mount mounting type
SOD-80 package family compatibility
Automotive grade qualification (AEC-Q101)
ROHS3 compliance requirement

Regulatory & Compliance Criteria:

Moisture Sensitivity Level 1 (Unlimited)
REACH Unaffected status
ECCN EAR99 classification

The TLZ27B-GS08 meets all substitution criteria with the exception of a nominal zener voltage of 27 V (compared to 25.62 V) and improved reverse leakage characteristics (40 nA versus 40 µA). The substitute part is Active status with significantly higher inventory availability.

Parameter Comparison

Parameter	VLZ27B-GS08 (Main Part)	TLZ27B-GS08 (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	25.62 V	27 V
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 23.7 V	40 nA @ 23.7 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-80 Variant (QuadroMELF)	SOD-80 Variant (MiniMELF)
Grade	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The TLZ27B-GS08 serves as the direct substitute for the obsolete VLZ27B-GS08. Both components are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications for power dissipation (500 mW), impedance (45 Ohms maximum), and forward voltage characteristics (1.5 V @ 200 mA).

Both parts carry Automotive grade qualification with AEC-Q101 certification and are ROHS3 compliant, meeting regulatory requirements for automotive and industrial applications. The operating temperature range of -65°C to 175°C is identical across both parts.

The primary difference is the nominal zener voltage: the substitute operates at 27 V compared to the main part's 25.62 V. This 1.38 V differential must be evaluated within the specific application circuit requirements. The substitute part exhibits superior reverse leakage performance (40 nA versus 40 µA), representing a 1000-fold improvement in leakage characteristics.

The TLZ27B-GS08 is currently in Active product status with substantially higher inventory availability (225,600 pieces) compared to the obsolete VLZ27B-GS08 (819 pieces remaining).

Frequently Asked Questions (FAQ)

Q: Can the TLZ27B-GS08 directly replace the VLZ27B-GS08 in all applications?

A: Direct substitution is possible when the application circuit tolerates a 27 V zener voltage instead of 25.62 V. The 1.38 V difference must be verified against circuit design specifications and voltage regulation requirements. All other electrical and mechanical parameters are equivalent.

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

A: Both are SOD-80 package variants in the Surface Mount category. The QuadroMELF (VLZ27B-GS08) and MiniMELF (TLZ27B-GS08) designations indicate different physical form factors within the SOD-80 family. PCB layout and footprint compatibility must be verified for the specific application.

Q: Why is the reverse leakage current significantly lower in the TLZ27B-GS08?

A: The TLZ27B-GS08 exhibits 40 nanoamperes reverse leakage compared to 40 microamperes in the VLZ27B-GS08. This represents improved semiconductor material quality and manufacturing process in the active substitute part. Both specifications are measured at 23.7 V reverse bias.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the VLZ27B-GS08 and TLZ27B-GS08 carry Automotive grade classification with AEC-Q101 qualification. Both are ROHS3 compliant and REACH unaffected, meeting automotive industry standards.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. No baking or desiccant storage is required prior to assembly.

Q: Why is the VLZ27B-GS08 listed as Obsolete?

A: The VLZ27B-GS08 has been discontinued by the manufacturer. The TLZ27B-GS08 represents the active equivalent in the Vishay product line, with ongoing production and availability.

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