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MMSZ5259BT1 Zener Diode 39V 500mW SOD-123 Equivalent & Substitute Parts
Part Overview
The MMSZ5259BT1 is a 39 V, 500 mW Zener diode manufactured by onsemi in SOD-123 surface mount packaging. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is RoHS non-compliant.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 39 | V |
| Power - Maximum | 500 | mW |
| Tolerance | ±5% | — |
| Impedance (Maximum) | 80 | Ohms |
| Current - Reverse Leakage @ Vr | 100 | nA @ 30 V |
| Voltage - Forward (Maximum) @ If | 900 | mV @ 10 mA |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | SOD-123 | — |
| RoHS Status | Non-compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the MMSZ5259BT1 is determined by the following critical parameters:
Primary Substitution Criteria:
- Zener voltage: 39 V nominal
- Maximum power dissipation: 500 mW or greater
- Voltage tolerance: ±5% or tighter
- Impedance (maximum): 80 Ohms or lower
- Reverse leakage current: 100 nA @ 30 V or lower
- Forward voltage: 900 mV @ 10 mA or lower
- Operating temperature range: -55°C to 150°C minimum
- Package: SOD-123 or SOD-123F (mechanically compatible)
- Mounting type: Surface Mount
Substitution Categories:
Direct Manufacturer Equivalents (onsemi): Parts with identical electrical specifications and active product status, differing only in packaging format (Cut Tape vs. Tape & Reel).
Parametric Equivalents (Vishay, Micro Commercial Co, onsemi automotive grade): Parts meeting all electrical specifications with active product status. Includes variants with tighter tolerance (±2%) and automotive-grade qualifications (AEC-Q101).
Similar Parts (Nexperia): Parts with matching 39 V zener voltage and ±5% tolerance but with reduced maximum power (375 mW vs. 500 mW) and different package variant (SOD-123F). Operating temperature range extends to -65°C. Automotive-grade with AEC-Q101 qualification.
Parameter Comparison
| Part Number | Manufacturer | Vz (V) | Power (mW) | Tolerance | Zzt (Ohms) | Ir @ Vr (nA) | Vf @ If (mV) | Temp Range (°C) | Package | Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MMSZ5259BT1 | onsemi | 39 | 500 | ±5% | 80 | 100 @ 30V | 900 @ 10mA | -55 to 150 | SOD-123 | Obsolete | Non-compliant |
| MMSZ5259BT1G | onsemi | 39 | 500 | ±5% | 80 | 100 @ 30V | 900 @ 10mA | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| SZMMSZ5259BT1G | onsemi | 39 | 500 | ±5% | 80 | 100 @ 30V | 900 @ 10mA | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259B-E3-08 | Vishay | 39 | 500 | ±5% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259B-E3-18 | Vishay | 39 | 500 | ±5% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259B-G3-08 | Vishay | 39 | 500 | ±5% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259B-G3-18 | Vishay | 39 | 500 | ±5% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259B-HE3-08 | Vishay | 39 | 500 | ±5% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Obsolete | ROHS3 Compliant |
| MMSZ5259B-TP | Micro Commercial Co | 39 | 500 | ±5% | 80 | 100 @ 30V | 900 @ 10mA | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| MMSZ5259C-E3-08 | Vishay | 39 | 500 | ±2% | 80 | 100 @ 30V | — | -55 to 150 | SOD-123 | Active | ROHS3 Compliant |
| BZT52H-C39,115 | Nexperia USA Inc. | 39 | 375 | ±5% | 75 | 50 @ 27.3V | 900 @ 10mA | -65 to 150 | SOD-123F | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation for Direct Replacement:
MMSZ5259BT1G (onsemi) is the direct successor to the obsolete MMSZ5259BT1. This part maintains identical electrical specifications and SOD-123 packaging while achieving ROHS3 compliance and active product status. It is available in Cut Tape and Digi-Reel packaging formats.
Recommended Parametric Equivalents:
SZMMSZ5259BT1G (onsemi) provides identical electrical performance with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. This part is suitable for applications requiring automotive-grade components and offers the highest inventory availability (125,400 units).
MMSZ5259B-E3-08 and MMSZ5259B-G3-08 (Vishay) are active parametric equivalents with ROHS3 compliance. These parts meet all electrical specifications and are available in Tape & Reel packaging.
MMSZ5259C-E3-08 (Vishay) offers tighter voltage tolerance (±2% vs. ±5%) while maintaining all other electrical parameters. This part is suitable for applications requiring improved voltage accuracy.
MMSZ5259B-TP (Micro Commercial Co) provides full parametric equivalence with ROHS3 compliance and active product status.
Alternative for Power-Reduced Applications:
BZT52H-C39,115 (Nexperia) is suitable only for applications where maximum power dissipation can be reduced to 375 mW. This part features automotive-grade qualification (AEC-Q101), extended low-temperature operation (-65°C), and ROHS3 compliance. The SOD-123F package is mechanically compatible with SOD-123 in most PCB layouts. Impedance is lower (75 Ohms vs. 80 Ohms) and reverse leakage is reduced (50 nA vs. 100 nA).
Compliance Considerations:
All recommended active substitutes achieve ROHS3 compliance, addressing the non-compliance status of the original MMSZ5259BT1. Selection between onsemi, Vishay, Micro Commercial Co, and Nexperia parts depends on supply chain requirements, packaging format preference, and automotive qualification needs.
Frequently Asked Questions (FAQ)
Q: Can MMSZ5259BT1G be used as a direct replacement for MMSZ5259BT1?
A: Yes. MMSZ5259BT1G is the direct active equivalent with identical electrical specifications (39 V, 500 mW, ±5% tolerance, SOD-123 package). The primary differences are active product status and ROHS3 compliance. Packaging is available in both Cut Tape and Digi-Reel formats.
Q: What is the difference between MMSZ5259BT1G and SZMMSZ5259BT1G?
A: Both parts have identical electrical specifications and SOD-123 packaging. SZMMSZ5259BT1G includes automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel packaging. MMSZ5259BT1G is available in Cut Tape and Digi-Reel formats. Selection depends on packaging requirements and whether automotive qualification is needed.
Q: Can MMSZ5259C-E3-08 replace MMSZ5259BT1?
A: Yes, with the advantage of tighter voltage tolerance. MMSZ5259C-E3-08 maintains all electrical specifications while providing ±2% tolerance instead of ±5%. This part is suitable for applications requiring improved voltage accuracy. All other parameters remain equivalent.
Q: Is BZT52H-C39,115 a suitable replacement?
A: BZT52H-C39,115 is suitable only for applications where maximum power dissipation can be reduced from 500 mW to 375 mW. The part maintains 39 V zener voltage and ±5% tolerance. It features automotive-grade qualification and extended low-temperature operation (-65°C). The SOD-123F package is mechanically compatible with SOD-123. Impedance is lower (75 Ohms) and reverse leakage is reduced (50 nA @ 27.3 V).
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Cut Tape (CT) and Digi-Reel packaging are suitable for manual handling and lower-volume assembly. Tape & Reel (TR) packaging is optimized for automated pick-and-place equipment and higher-volume production. Electrical specifications are identical; selection depends on assembly process requirements.
Q: Are all recommended substitutes RoHS compliant?
A: All active substitute parts listed achieve ROHS3 compliance. The original MMSZ5259BT1 is RoHS non-compliant. Substitution with any recommended active part addresses RoHS compliance requirements.
Q: Can Vishay parts (MMSZ5259B series) be mixed with onsemi parts in the same design?
A: Yes. All Vishay MMSZ5259B variants and onsemi MMSZ5259BT1G maintain identical electrical specifications, voltage tolerance, impedance, and operating temperature range. They are electrically interchangeable. Procurement and supply chain considerations may influence part selection.
Q: What is the significance of the "-E3-08" and "-G3-08" suffixes in Vishay part numbers?
A: These suffixes indicate packaging and tape format specifications. Both variants maintain identical electrical specifications. Selection between them depends on specific packaging and reel format requirements for automated assembly equipment.
Q: Is automotive-grade qualification required for this application?
A: Automotive-grade qualification (AEC-Q101) is required only for automotive applications. SZMMSZ5259BT1G and BZT52H-C39,115 include this qualification. For non-automotive applications, standard-grade parts such as MMSZ5259BT1G or Vishay MMSZ5259B variants are appropriate.
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