VLZ27C-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ27C-GS08 is a Zener diode rated at 26.29 V nominal 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. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for ongoing design support and production continuity. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	26.29	V
Power - Maximum	500	mW
Impedance (Maximum)	45	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 24.3 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
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 VLZ27C-GS08 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage within acceptable tolerance of 26.29 V nominal
Power dissipation rating of 500 mW or greater
Operating temperature range encompassing -65°C to 175°C minimum
Surface mount package configuration (SOD-80 family)
Reverse leakage current specifications compatible with circuit requirements

Compliance & Status Criteria:

Active product status for ongoing availability
ROHS3 compliance maintained
Automotive-grade qualification or equivalent reliability standard

The substitute parts identified (TLZ27C-GS08 and BZV55-B27,115) meet these electrical and mechanical requirements while offering improved availability and active product status. Both substitutes operate within the specified temperature range and maintain the required power rating and package form factor.

Parameter Comparison

Parameter	VLZ27C-GS08 (Main)	TLZ27C-GS08 (Substitute)	BZV55-B27,115 (Substitute)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	NXP Semiconductors
Voltage - Zener (Nominal)	26.29 V	27 V	27 V
Tolerance	—	—	±2%
Power - Maximum	500 mW	500 mW	500 mW
Impedance (Maximum)	45 Ohms	45 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 24.3 V	40 nA @ 24.3 V	50 nA @ 18.9 V
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	900 mV @ 10 mA
Operating Temperature Range	-65°C to 175°C	-65°C to 175°C	-65°C to 200°C
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	SOD-80 MiniMELF
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	REACH Unaffected

Engineering Selection Recommendations

TLZ27C-GS08 Selection: The TLZ27C-GS08 is the primary substitute from Vishay General Semiconductor. This part maintains identical electrical specifications (500 mW power rating, 45 Ohm impedance, 1.5 V forward voltage) and operating temperature range as the VLZ27C-GS08. The zener voltage is 27 V nominal versus 26.29 V, representing a 0.71 V difference. The TLZ27C-GS08 offers significantly improved reverse leakage performance (40 nA versus 40 µA), active product status, and ROHS3 compliance. The package variant transitions from QuadroMELF to MiniMELF within the SOD-80 family, maintaining surface mount compatibility.

BZV55-B27,115 Selection: The BZV55-B27,115 from NXP Semiconductors provides an alternative from a different manufacturer. This part meets the 500 mW power requirement and operates across an extended temperature range (-65°C to 200°C). The zener voltage is 27 V nominal with ±2% tolerance specification. The impedance is specified at 80 Ohms (versus 45 Ohms in the main part), and forward voltage is 900 mV at 10 mA. This part is active and REACH compliant. Selection of this substitute requires verification that the higher impedance and different forward voltage characteristics are acceptable for the specific circuit application.

Availability & Compliance: Both substitutes are active products with substantial inventory availability. The TLZ27C-GS08 is recommended as the primary choice due to closer electrical parameter alignment and maintained automotive-grade qualification. The BZV55-B27,115 serves as a secondary option when TLZ27C-GS08 availability is constrained.

Frequently Asked Questions (FAQ)

Q: Can the TLZ27C-GS08 directly replace the VLZ27C-GS08 in all applications?

A: The TLZ27C-GS08 is electrically compatible for most applications. The zener voltage difference of 0.71 V (27 V versus 26.29 V) must be evaluated against circuit tolerance requirements. Both parts share identical power ratings (500 mW), impedance (45 Ohms), and operating temperature range (-65°C to 175°C). The TLZ27C-GS08 exhibits superior reverse leakage performance (40 nA versus 40 µA). Package compatibility is maintained within the SOD-80 surface mount family.

Q: What is the significance of the package change from QuadroMELF to MiniMELF?

A: Both QuadroMELF and MiniMELF are variants within the SOD-80 package family and are surface mount compatible. The MiniMELF variant (used in TLZ27C-GS08 and BZV55-B27,115) is a smaller form factor. PCB layout and footprint compatibility must be verified before substitution. Consult component datasheets for precise dimensional specifications.

Q: Why is the reverse leakage current significantly lower in the TLZ27C-GS08?

A: The TLZ27C-GS08 specifies 40 nanoamperes versus 40 microamperes in the VLZ27C-GS08. This represents improved leakage performance in the substitute part. Lower reverse leakage reduces standby current consumption and improves circuit efficiency. This is a beneficial characteristic for substitution.

Q: Is the BZV55-B27,115 suitable for automotive applications?

A: The BZV55-B27,115 is manufactured by NXP Semiconductors and is REACH compliant. The VLZ27C-GS08 carries AEC-Q101 automotive qualification. The BZV55-B27,115 datasheet must be consulted to confirm automotive-grade qualification status before use in automotive applications requiring specific reliability standards.

Q: What is the impact of the 80 Ohm impedance in the BZV55-B27,115 versus 45 Ohm in the main part?

A: Impedance affects the zener diode's dynamic response and voltage regulation characteristics. The BZV55-B27,115 impedance of 80 Ohms is higher than the 45 Ohm specification of the VLZ27C-GS08. This difference impacts transient response and regulation performance. Circuit-specific analysis is required to determine acceptability for voltage regulation or protection applications.

Q: Are both substitutes ROHS3 compliant?

A: The TLZ27C-GS08 is explicitly ROHS3 compliant. The BZV55-B27,115 is listed as REACH Unaffected. Confirm specific ROHS3 compliance status with the NXP datasheet for the BZV55-B27,115 if ROHS3 certification is a procurement requirement.

Q: What is the inventory status of these substitutes?

A: The TLZ27C-GS08 has 30,300 pieces in stock. The BZV55-B27,115 has 41,641 pieces in stock. Both substitutes offer substantially higher availability than the obsolete VLZ27C-GS08 (694 pieces remaining).

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