VLZ39D-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ39D-GS08 is a Zener diode rated at 37.58 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 obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for regulated applications requiring long-term component availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	37.58	V
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 34.8 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 QuadroMELF	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the VLZ39D-GS08 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Zener voltage nominal rating within the application tolerance band
Power dissipation rating of 500 mW
Surface mount package compatibility (SOD-80 family)
Operating temperature range coverage (-65°C to 175°C minimum)
Impedance characteristics suitable for circuit performance

Substitution Logic: The VLZ39D-GS08 operates at 37.58 V nominal. Substitute parts rated at 39 V nominal represent the closest available standard Zener voltage in the product ecosystem. Both the TLZ39D-GS08 (Vishay) and BZV55-C39,115 (NXP) meet the 500 mW power requirement and SOD-80 package specification. The TLZ39D-GS08 maintains Vishay manufacturing continuity with identical impedance (85 Ohms) and forward voltage characteristics. The BZV55-C39,115 provides an alternative from a different manufacturer with extended temperature range capability (up to 200°C) and includes voltage tolerance specification (±5%).

Parameter Comparison

Parameter	VLZ39D-GS08	TLZ39D-GS08	BZV55-C39,115
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	NXP Semiconductors
Voltage - Zener (Nom)	37.58 V	39 V	39 V
Voltage Tolerance	—	—	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	85 Ohms	85 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 34.8 V	40 nA @ 34.8 V	50 nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	SOD-80 MiniMELF
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TLZ39D-GS08 (Vishay General Semiconductor - Diodes Division): This substitute maintains manufacturer continuity within the Vishay product line and is classified as active with established supply availability (7700 pcs in stock). The TLZ39D-GS08 provides identical impedance (85 Ohms) and forward voltage characteristics to the original VLZ39D-GS08, ensuring circuit performance consistency. The primary difference is packaging format (MiniMELF versus QuadroMELF) and zener voltage nominal (39 V versus 37.58 V). The part carries ROHS3 compliance and unlimited moisture sensitivity rating. This option is suitable for applications where Vishay component continuity and impedance matching are design priorities.

BZV55-C39,115 (NXP Semiconductors): This substitute represents a cross-manufacturer alternative with active product status and substantial inventory availability (837,966 pcs in stock). The BZV55-C39,115 meets the 500 mW power requirement and SOD-80 package specification with extended operating temperature range (-65°C to 200°C). The part includes explicit voltage tolerance specification (±5%) and carries ROHS3 compliance. Impedance is specified at 130 Ohms (higher than the original 85 Ohms), which may affect circuit transient response characteristics. This option is suitable for applications requiring cross-manufacturer sourcing flexibility and extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the TLZ39D-GS08 directly replace the VLZ39D-GS08 in existing designs?

A: The TLZ39D-GS08 is functionally equivalent for applications where the 39 V nominal zener voltage is acceptable within circuit tolerance margins. Both parts share identical power rating (500 mW), impedance (85 Ohms), and forward voltage characteristics (1.5 V @ 200 mA). The primary consideration is the 1.42 V difference in nominal zener voltage (39 V versus 37.58 V). PCB layout modifications may be required due to package format differences (MiniMELF versus QuadroMELF).

Q: What are the key differences between the TLZ39D-GS08 and BZV55-C39,115?

A: Both parts are rated at 39 V nominal and 500 mW power dissipation in SOD-80 packages. The TLZ39D-GS08 maintains Vishay manufacturing with 85 Ohms impedance and -65°C to 175°C temperature range. The BZV55-C39,115 is manufactured by NXP with 130 Ohms impedance, extended temperature range to 200°C, and explicit ±5% voltage tolerance specification. The impedance difference (85 versus 130 Ohms) affects circuit transient response and should be evaluated for specific applications.

Q: Are package format differences between QuadroMELF and MiniMELF significant for substitution?

A: Both QuadroMELF and MiniMELF are SOD-80 package variants with different physical dimensions and lead configurations. PCB footprint modifications are required when substituting between these formats. Design review and layout verification are necessary to confirm mechanical compatibility with existing circuit board designs.

Q: Does the higher impedance of the BZV55-C39,115 (130 Ohms versus 85 Ohms) affect circuit performance?

A: Impedance differences influence transient response characteristics and voltage regulation performance. The BZV55-C39,115 impedance of 130 Ohms is higher than the original 85 Ohms specification. Circuit simulation or testing may be required to confirm performance equivalence in applications with stringent transient response requirements.

Q: What is the significance of the reverse leakage current differences between substitute parts?

A: The VLZ39D-GS08 specifies 40 µA reverse leakage at 34.8 V, while both substitute parts specify leakage in the nanoampere range (40 nA and 50 nA respectively). Lower reverse leakage improves circuit performance in high-impedance applications and reduces power dissipation. This represents an improvement over the original part specification.

Q: Are all substitute parts ROHS3 compliant and suitable for regulated applications?

A: Yes, all three parts (VLZ39D-GS08, TLZ39D-GS08, and BZV55-C39,115) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). The TLZ39D-GS08 maintains automotive-grade qualification (AEC-Q101). Component selection should be based on specific application requirements for automotive or other regulated environments.

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