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TZMB51-GS18 Equivalent & Substitute Parts
Part Overview
The TZMB51-GS18 is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates at a nominal Zener voltage of 51 V with a maximum power dissipation of 500 mW in a surface mount SOD-80 MiniMELF package. The device is AEC-Q101 qualified and RoHS3 compliant, making it suitable for automotive applications requiring voltage regulation and transient protection. Equivalent substitute parts are identified based on matching electrical specifications, mechanical packaging, and automotive qualification standards.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 51 | V |
| Tolerance | ±2% | % |
| Power - Max | 500 | mW |
| Impedance (Max) | 125 | Ohms |
| Current - Reverse Leakage @ Vr | 100 | nA @ 39 V |
| Voltage - Forward (Vf) (Max) @ If | 1.5 | V @ 200 mA |
| Operating Temperature Range | -65 to 175 | °C |
| Package / Case | DO-213AC, MINI-MELF, SOD-80 | |
| Mounting Type | Surface Mount | |
| Grade | Automotive | |
| Qualification | AEC-Q101 |
Substitute Part Grouping Explanation
Substitute parts for the TZMB51-GS18 are identified based on strict equivalence across the following critical parameters:
- Zener Voltage (Vz): 51 V nominal with ±2% tolerance
- Power Dissipation: 500 mW maximum
- Package Type: SOD-80 MiniMELF surface mount
- Impedance (Zzt): 125 Ohms maximum
- Reverse Leakage Current: 100 nA @ 39 V
- Forward Voltage: 1.5 V maximum @ 200 mA
- Operating Temperature: -65°C to 175°C
- Automotive Grade: AEC-Q101 qualified
- Compliance: RoHS3 compliant
The TZMB51-GS08 is classified as a parametric equivalent to the TZMB51-GS18. Both devices share identical electrical specifications, thermal operating range, automotive qualification, and packaging. The substitution is valid for direct replacement in circuit applications where these parameters are required.
Parameter Comparison
| Parameter | TZMB51-GS18 | TZMB51-GS08 | Match |
|---|---|---|---|
| Voltage - Zener (Nom) | 51 V | 51 V | Yes |
| Tolerance | ±2% | ±2% | Yes |
| Power - Max | 500 mW | 500 mW | Yes |
| Impedance (Max) | 125 Ohms | 125 Ohms | Yes |
| Current - Reverse Leakage @ Vr | 100 nA @ 39 V | 100 nA @ 39 V | 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 |
| Package / Case | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| 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 |
| REACH Status | REACH Unaffected | REACH Unaffected | Yes |
Engineering Selection Recommendations
The TZMB51-GS08 is a direct parametric equivalent to the TZMB51-GS18 and is suitable for substitution in applications requiring a 51 V Zener diode with 500 mW power dissipation. Both parts are manufactured by Vishay General Semiconductor - Diodes Division within the TZM series and carry identical AEC-Q101 automotive qualification. Both devices are RoHS3 compliant and REACH unaffected, meeting regulatory requirements for automotive and industrial applications.
Selection between these two part numbers should be based on availability and supply chain considerations. The TZMB51-GS08 currently has higher inventory availability (1528 pieces) compared to the TZMB51-GS18 (734 pieces). No electrical or mechanical performance differences exist between these devices.
Frequently Asked Questions (FAQ)
Q: Can the TZMB51-GS08 be used as a direct replacement for the TZMB51-GS18?
A: Yes. The TZMB51-GS08 is a parametric equivalent with identical electrical specifications, power rating, operating temperature range, package type, and automotive qualification. Direct substitution is valid for all applications where the TZMB51-GS18 is specified.
Q: Are there any differences in the SOD-80 MiniMELF package between these parts?
A: No. Both parts use the identical DO-213AC, MINI-MELF, SOD-80 package. PCB footprint, lead spacing, and mounting procedures are identical.
Q: Do both parts meet automotive qualification standards?
A: Yes. Both the TZMB51-GS18 and TZMB51-GS08 are AEC-Q101 qualified automotive-grade components. Both are suitable for automotive applications requiring regulated voltage regulation and transient protection.
Q: What is the significance of the ±2% tolerance specification?
A: The ±2% tolerance indicates the maximum deviation of the actual Zener voltage from the nominal 51 V specification. This tolerance applies to both parts and determines the acceptable voltage regulation range in circuit applications.
Q: Are moisture sensitivity considerations the same for both parts?
A: Yes. Both parts have a Moisture Sensitivity Level (MSL) of 1, which indicates unlimited shelf life without moisture control requirements. No special storage or handling procedures are necessary.
Q: What is the maximum reverse leakage current specification?
A: Both parts specify a maximum reverse leakage current of 100 nanoamperes measured at 39 V reverse bias. This parameter defines the leakage behavior when the diode is reverse biased below the Zener voltage threshold.
Q: Can these parts be used interchangeably in high-temperature applications?
A: Yes. Both parts operate across the identical temperature range of -65°C to 175°C. Thermal performance and reliability are equivalent across this operating range.
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