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VLZ39-GS18 Equivalent & Substitute Parts
Part Overview
The VLZ39-GS18 is a Zener diode rated at 39 V nominal voltage with 500 mW maximum 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 VLZ39-GS18 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for ongoing production and field support applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 39 | V |
| Power - Max | 500 | mW |
| Impedance (Max) | 85 | Ohms |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | V @ 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 | |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the VLZ39-GS18 is determined by electrical and mechanical parameter equivalence. The critical parameters that define substitution eligibility are:
- Zener voltage: 39 V nominal
- Maximum power dissipation: 500 mW
- Maximum impedance: 85 Ohms
- Forward voltage: 1.5 V maximum at 200 mA
- Operating temperature range: -65°C to 175°C
- Surface mount configuration
- SOD-80 package family compatibility
- Automotive grade qualification (AEC-Q101)
- RoHS3 compliance
- MSL 1 rating
The TLZ39-GS18 meets all electrical parameter requirements and maintains automotive qualification. The primary distinction is the package variant designation (MiniMELF versus QuadroMELF) within the SOD-80 family and the product status transition from obsolete to active.
Parameter Comparison
| Parameter | VLZ39-GS18 | TLZ39-GS18 | Match |
|---|---|---|---|
| Voltage - Zener (Nom) | 39 V | 39 V | Yes |
| Power - Max | 500 mW | 500 mW | Yes |
| Impedance (Max) | 85 Ohms | 85 Ohms | Yes |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | 1.5 V @ 200 mA | Yes |
| Operating Temperature Range | -65°C to 175°C | -65°C to 175°C | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| Package / Case | SOD-80 QuadroMELF | SOD-80 MiniMELF | SOD-80 Family |
| Grade | Automotive | Automotive | Yes |
| Qualification | AEC-Q101 | AEC-Q101 | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Yes |
| Product Status | Obsolete | Active | Upgrade Path |
Engineering Selection Recommendations
The TLZ39-GS18 is the direct electrical and functional equivalent to the VLZ39-GS18. Both components are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications across all critical parameters: 39 V zener voltage, 500 mW power rating, 85 Ohms maximum impedance, and -65°C to 175°C operating temperature range.
Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance certification, ensuring suitability for automotive and regulated applications. The MSL 1 rating on both components indicates unlimited moisture sensitivity protection.
The TLZ39-GS18 represents an active product status, whereas the VLZ39-GS18 is obsolete. Selection of the TLZ39-GS18 provides access to current manufacturing, ongoing inventory availability, and manufacturer support. The package variant difference (MiniMELF versus QuadroMELF) within the SOD-80 family requires PCB layout verification to confirm footprint compatibility with existing designs.
Frequently Asked Questions (FAQ)
Q: Are the VLZ39-GS18 and TLZ39-GS18 electrically interchangeable?
A: Yes. Both components have identical electrical specifications: 39 V nominal zener voltage, 500 mW maximum power dissipation, 85 Ohms maximum impedance, 1.5 V forward voltage at 200 mA, and -65°C to 175°C operating temperature range. Electrical performance is equivalent.
Q: What is the difference between SOD-80 QuadroMELF and SOD-80 MiniMELF packages?
A: Both are SOD-80 package variants within the MELF (Metal Electrode Leadless Face) family. The QuadroMELF and MiniMELF designations indicate different physical dimensions and lead configurations. PCB footprint compatibility must be verified before substitution.
Q: Why is the VLZ39-GS18 listed as obsolete?
A: The VLZ39-GS18 has reached end-of-life status with the manufacturer. The TLZ39-GS18 is the active replacement product offering identical electrical performance with current manufacturing support.
Q: Are both parts qualified for automotive applications?
A: Yes. Both the VLZ39-GS18 and TLZ39-GS18 carry AEC-Q101 automotive qualification and are suitable for automotive-grade applications.
Q: What compliance certifications apply to both parts?
A: Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry MSL 1 (unlimited) moisture sensitivity rating.
Q: Can I use the TLZ39-GS18 as a direct replacement in existing designs?
A: Electrical substitution is valid. Physical PCB layout compatibility must be confirmed due to the package variant difference between QuadroMELF and MiniMELF within the SOD-80 family.
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