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MMSZ5231C-TP Zener Diode Equivalent & Substitute Parts
Part Overview
The MMSZ5231C-TP is a 5.1 V Zener diode manufactured by Micro Commercial Co, rated for 500 mW maximum power dissipation with ±2% voltage tolerance. This surface mount component in SOD-123 package is designed for interface applications requiring voltage regulation and transient protection. The part is currently in active production status with 904 units in stock.
Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for components with comparable electrical characteristics and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 5.1 | V |
| Tolerance | ±2% | - |
| Power - Maximum | 500 | mW |
| Impedance (Maximum) | 17 | Ohms |
| Current - Reverse Leakage @ Vr | 5 | µA @ 2 V |
| Voltage - Forward (Maximum) @ If | 900 | mV @ 10 mA |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | - |
| Package / Case | SOD-123 | - |
Substitute Part Grouping Explanation
Substitution of the MMSZ5231C-TP is determined by the following critical parameters:
Primary Substitution Criteria:
- Zener voltage: 5.1 V nominal
- Package type: SOD-123 surface mount
- Operating temperature range: -55°C to 150°C minimum
- Mounting type: Surface mount
Secondary Compatibility Factors:
- Voltage tolerance: ±2% to ±6% acceptable
- Power rating: 410 mW to 500 mW acceptable
- Impedance: 17 to 60 Ohms acceptable
- Reverse leakage current: 2 µA to 100 nA acceptable
Substitute parts are grouped into two categories based on power rating and tolerance specifications. Parts with 410 mW power ratings represent reduced power dissipation alternatives suitable for lower-current applications. Parts with ±5% and ±6% tolerances provide broader voltage acceptance windows compared to the ±2% specification of the primary part.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Package | Status | Inventory |
|---|---|---|---|---|---|---|---|---|
| MMSZ5231C-TP | Micro Commercial Co | 5.1 | ±2% | 500 | 17 | SOD-123 | Active | 904 |
| BZT52B5V1-E3-08 | Vishay General Semiconductor | 5.1 | ±2% | 410 | 60 | SOD-123 | Active | 118690 |
| BZT52B5V1-E3-18 | Vishay General Semiconductor | 5.1 | ±2% | 410 | 60 | SOD-123 | Active | 30036 |
| BZT52B5V1-HE3-08 | Vishay General Semiconductor | 5.1 | ±2% | 410 | 60 | SOD-123 | Obsolete | 31444 |
| BZT52C5V1-7-F | Diodes Incorporated | 5.1 | ±6% | 500 | 60 | SOD-123 | Active | 110400 |
| BZT52C5V1-E3-08 | Vishay General Semiconductor | 5.1 | ±6% | 410 | 60 | SOD-123 | Active | 17200 |
| BZT52C5V1-E3-18 | Vishay General Semiconductor | 5.1 | ±5% | 410 | 60 | SOD-123 | Active | 7882 |
| BZT52C5V1-G3-08 | Vishay General Semiconductor | 5.1 | ±5% | 410 | 60 | SOD-123 | Active | 12032 |
| BZT52C5V1-HE3-08 | Vishay General Semiconductor | 5.1 | ±5% | 410 | 60 | SOD-123 | Obsolete | 47380 |
| BZT52C5V1-HE3-18 | Vishay General Semiconductor | 5.1 | ±5% | 410 | 60 | SOD-123 | Obsolete | 8613 |
| BZT52C5V1T-7 | Diodes Incorporated | 5.1 | ±6% | 300 | 60 | SOD-523 | Active | 191300 |
Engineering Selection Recommendations
Preferred Active Substitutes (Matching ±2% Tolerance):
BZT52B5V1-E3-08 and BZT52B5V1-E3-18 from Vishay General Semiconductor maintain the ±2% voltage tolerance specification of the MMSZ5231C-TP. Both parts are in active production status with substantial inventory availability. The primary difference is reduced power rating (410 mW versus 500 mW), which is acceptable for applications not requiring maximum power dissipation. Both parts are RoHS3 compliant with MSL 1 rating.
Alternative Active Substitutes (±5% to ±6% Tolerance):
BZT52C5V1-7-F from Diodes Incorporated provides equivalent 500 mW power rating with ±6% tolerance and is in active production with high inventory (110,400 units). This part accommodates broader voltage tolerance specifications. BZT52C5V1-E3-08, BZT52C5V1-E3-18, and BZT52C5V1-G3-08 from Vishay offer ±5% to ±6% tolerance with 410 mW power rating and are all in active production status.
Obsolete Parts (Not Recommended for New Designs):
BZT52B5V1-HE3-08, BZT52C5V1-HE3-08, and BZT52C5V1-HE3-18 are marked as obsolete. While inventory remains available, these parts should not be selected for new designs or long-term production commitments.
Package Consideration:
BZT52C5V1T-7 uses SOD-523 package instead of SOD-123, making it incompatible with existing PCB layouts designed for the MMSZ5231C-TP. This part is suitable only when PCB redesign is acceptable.
Frequently Asked Questions (FAQ)
Q: Can BZT52B5V1-E3-08 replace MMSZ5231C-TP in all applications?
A: BZT52B5V1-E3-08 is compatible for applications where 410 mW power dissipation is sufficient. The ±2% voltage tolerance matches the original specification. Verify that circuit design does not require the full 500 mW power rating of the MMSZ5231C-TP.
Q: What is the difference between BZT52B5V1 and BZT52C5V1 series?
A: The primary difference is voltage tolerance. BZT52B5V1 series maintains ±2% tolerance, while BZT52C5V1 series has ±5% to ±6% tolerance. Both series share identical 5.1 V nominal voltage and SOD-123 package specifications.
Q: Why do some substitute parts have different impedance values?
A: Impedance (Zzt) varies between manufacturers and product lines. The MMSZ5231C-TP has 17 Ohms maximum impedance, while Vishay BZT52 series parts specify 60 Ohms maximum. Both values are within acceptable ranges for typical zener diode applications. Verify impedance requirements for specific circuit designs.
Q: Are the Vishay BZT52 parts with -HE3 suffix suitable for new designs?
A: No. Parts with -HE3 suffix are marked as obsolete. Use active production alternatives such as BZT52B5V1-E3-08, BZT52B5V1-E3-18, or BZT52C5V1-E3-18 instead.
Q: Can BZT52C5V1T-7 be used as a direct replacement?
A: No. BZT52C5V1T-7 uses SOD-523 package, which is physically different from the SOD-123 package of MMSZ5231C-TP. PCB layout modification is required. Use this part only when package change is acceptable.
Q: What is the significance of the packaging suffix (E3-08 versus E3-18)?
A: The suffix indicates packaging format. E3-08 denotes 8mm tape width, while E3-18 denotes 18mm tape width. Both are Tape & Reel (TR) formats suitable for automated assembly. Selection depends on manufacturing equipment compatibility.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts are RoHS3 compliant. The MMSZ5231C-TP does not specify RoHS status in the provided data. Verify RoHS compliance requirements for your application.
Q: Which substitute offers the best inventory availability?
A: BZT52C5V1T-7 from Diodes Incorporated has the highest inventory at 191,300 units. For SOD-123 package specifically, BZT52B5V1-E3-08 has 118,690 units available.
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