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ZMM5259B-7 Equivalent & Substitute Parts
Part Overview
The ZMM5259B-7 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 39 V nominal Zener voltage with 500 mW maximum power dissipation. This component is designed for voltage regulation and protection applications in surface mount configurations using the Mini MELF package format (DO-213AA).
The ZMM5259B-7 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 39 | V |
| Tolerance | ±5% | % |
| Power - Max | 500 | mW |
| Impedance (Max) | 80 | Ohms |
| Current - Reverse Leakage @ Vr | 100 | nA @ 30 V |
| Voltage - Forward (Vf) (Max) @ If | 1.5 | V @ 200 mA |
| Operating Temperature Range | -65 to 175 | °C (TJ) |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-213AA | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the ZMM5259B-7 is determined by strict equivalence across the following critical parameters:
Electrical Parameters (Must Match):
- Voltage - Zener (Nom): 39 V
- Tolerance: ±5%
- Power - Max: 500 mW
- Impedance (Max): 80 Ohms
- Current - Reverse Leakage @ Vr: 100 nA @ 30 V
- Operating Temperature Range: -65°C to 175°C (TJ)
Mechanical Parameters (Must Match):
- Mounting Type: Surface Mount
- Package / Case: DO-213AA
Compliance Parameters:
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
The 1N5259BUR-1/TR from Microchip Technology meets all specified electrical and mechanical parameters and maintains full compliance with RoHS3 and MSL requirements. This part is classified as Active product status, ensuring ongoing availability and support.
Parameter Comparison
| Parameter | ZMM5259B-7 (Vishay) | 1N5259BUR-1/TR (Microchip) | Match Status |
|---|---|---|---|
| Voltage - Zener (Nom) | 39 V | 39 V | Equivalent |
| Tolerance | ±5% | ±5% | Equivalent |
| Power - Max | 500 mW | 500 mW | Equivalent |
| Impedance (Max) | 80 Ohms | 80 Ohms | Equivalent |
| Current - Reverse Leakage @ Vr | 100 nA @ 30 V | 100 nA @ 30 V | Equivalent |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | 1.1 V @ 200 mA | Compatible (1N5259BUR-1/TR lower) |
| Operating Temperature Range | -65 to 175°C (TJ) | -65 to 175°C (TJ) | Equivalent |
| Mounting Type | Surface Mount | Surface Mount | Equivalent |
| Package / Case | DO-213AA | DO-213AA | Equivalent |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Equivalent |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Equivalent |
Engineering Selection Recommendations
The 1N5259BUR-1/TR is a direct parametric equivalent to the ZMM5259B-7 across all critical electrical and mechanical specifications. The substitute part is manufactured by Microchip Technology and carries Active product status, ensuring long-term availability and supply chain stability compared to the obsolete ZMM5259B-7.
Both parts maintain identical compliance certifications: ROHS3 compliance and MSL Level 1 (Unlimited). The forward voltage characteristic of the 1N5259BUR-1/TR (1.1 V @ 200 mA) is lower than the ZMM5259B-7 (1.5 V @ 200 mA), which represents an operational advantage in applications where reduced forward voltage drop is beneficial or neutral to circuit performance.
The identical DO-213AA package format and surface mount configuration ensure direct mechanical and electrical compatibility in existing PCB layouts and assembly processes.
Frequently Asked Questions (FAQ)
Q: Can the 1N5259BUR-1/TR replace the ZMM5259B-7 in existing designs?
A: Yes. The 1N5259BUR-1/TR meets all specified electrical parameters (39 V Zener voltage, ±5% tolerance, 500 mW power rating, 80 Ohms impedance, 100 nA reverse leakage) and uses the identical DO-213AA package. No circuit redesign is required.
Q: What is the difference in forward voltage between these parts?
A: The ZMM5259B-7 specifies 1.5 V maximum forward voltage at 200 mA, while the 1N5259BUR-1/TR specifies 1.1 V maximum at the same current. The lower forward voltage of the substitute part does not create compatibility issues and may reduce power dissipation in forward-biased conditions.
Q: Are both parts RoHS compliant?
A: Yes. Both the ZMM5259B-7 and 1N5259BUR-1/TR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings.
Q: What is the packaging difference between these parts?
A: The ZMM5259B-7 is supplied in Mini MELF format. The 1N5259BUR-1/TR is supplied in Tape & Reel (TR) format. Both use the DO-213AA package case, ensuring identical PCB footprint and assembly compatibility.
Q: Why is the ZMM5259B-7 marked as obsolete?
A: The ZMM5259B-7 is classified as obsolete by Vishay General Semiconductor. The 1N5259BUR-1/TR from Microchip Technology is an Active product with ongoing manufacturing and support, making it the recommended choice for new designs and ongoing production.
Q: Are the operating temperature ranges identical?
A: Yes. Both parts operate across the identical temperature range of -65°C to 175°C (TJ).
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