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MMSZ5226B-TP Zener Diode 3.3V 500mW SOD-123 Equivalent & Substitute Parts
Part Overview
The MMSZ5226B-TP is a surface mount Zener diode manufactured by Micro Commercial Co, rated for 3.3 V nominal Zener voltage with 500 mW maximum power dissipation in SOD-123 package. The device is ROHS3 compliant and carries Active product status. Equivalent and substitute parts are identified based on matching or compatible electrical specifications and mechanical packaging requirements. Alternative sources and variants are necessary to support supply chain flexibility, alternative packaging formats, and application-specific requirements such as automotive qualification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 3.3 | V |
| Tolerance | ±5% | % |
| Power - Max | 500 | mW |
| Impedance (Max) | 28 | Ohms |
| Current - Reverse Leakage @ Vr | 25 | µA @ 1 V |
| Voltage - Forward (Vf) (Max) @ If | 900 | mV @ 10 mA |
| Operating Temperature | -55 to 150 | °C |
| Mounting Type | Surface Mount | |
| Package / Case | SOD-123 | |
| RoHS Status | ROHS3 Compliant | |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution logic is based on the following critical parameters that determine functional equivalence:
Primary Matching Criteria:
- Voltage - Zener (Nom): 3.3 V
- Tolerance: ±5% or ±6%
- Power - Max: 500 mW (direct equivalents) or reduced power ratings (similar/limited substitutes)
- Mounting Type: Surface Mount
- Operating Temperature Range: -55°C to 150°C minimum
- RoHS3 Compliance: Required
- Moisture Sensitivity Level: 1 (Unlimited)
Substitution Categories:
Direct Equivalents match all primary electrical parameters and SOD-123 packaging with identical or superior performance characteristics.
Direct Manufacturer Variants from onsemi (MMSZ3V3T1G, MMSZ4684T1G, SZMMSZ3V3T1G, SZMMSZ4684T1G) provide identical Zener voltage and power ratings with alternative impedance and leakage specifications. Automotive-grade variants (SZMMSZ series) include AEC-Q101 qualification.
Similar Substitutes maintain 3.3 V Zener voltage and ±5% to ±6% tolerance but differ in power rating, package format, or impedance characteristics. These are suitable where application requirements permit reduced power dissipation or alternative package geometries.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance (%) | Power (mW) | Zzt (Ohms) | Ir @ Vr (µA) | Package | Packaging Format | Temp Range (°C) | Grade |
|---|---|---|---|---|---|---|---|---|---|---|
| MMSZ5226B-TP | Micro Commercial Co | 3.3 | ±5 | 500 | 28 | 25 @ 1V | SOD-123 | Tape & Reel | -55 to 150 | Commercial |
| MMSZ3V3T1G | onsemi | 3.3 | ±5 | 500 | 95 | 5 @ 1V | SOD-123 | Tape & Reel | -55 to 150 | Commercial |
| MMSZ4684T1G | onsemi | 3.3 | ±5 | 500 | Not specified | 7.5 @ 1.5V | SOD-123 | Cut Tape & Digi-Reel | -55 to 150 | Commercial |
| SZMMSZ3V3T1G | onsemi | 3.3 | ±5 | 500 | 95 | 5 @ 1V | SOD-123 | Tape & Reel | -55 to 150 | Automotive (AEC-Q101) |
| SZMMSZ4684T1G | onsemi | 3.3 | ±5 | 500 | Not specified | 7.5 @ 1.5V | SOD-123 | Tape & Reel | -55 to 150 | Automotive (AEC-Q101) |
| BZT52C3V3T-7 | Diodes Incorporated | 3.3 | ±6 | 300 | 95 | 5 @ 1V | SOD-523 | Tape & Reel | -65 to 150 | Commercial |
| CMHZ5226B TR PBFREE | Central Semiconductor Corp | 3.3 | ±5 | 500 | 28 | 25 @ 1V | SOD-123 | Tape & Reel | -65 to 150 | Commercial |
| DDZ9684-7 | Diodes Incorporated | 3.3 | ±5 | 500 | Not specified | 7.5 @ 1.5V | SOD-123 | Tape & Reel | -65 to 150 | Commercial |
| MMSZ5226B-7-F | Diodes Incorporated | 3.3 | ±5 | 500 | 28 | 25 @ 1V | SOD-123 | Cut Tape & Digi-Reel | -65 to 150 | Commercial |
| MMSZ5226B_R1_00001 | Panjit International Inc. | 3.3 | ±5 | 500 | 28 | 25 @ 1V | SOD-123 | Tape & Reel | -55 to 150 | Commercial |
| PZU3.3BA,115 | Nexperia USA Inc. | 3.3 | ±5 | 320 | 95 | 5 @ 1V | SOD-323 | Tape & Reel | -55 to 150 | Commercial |
Engineering Selection Recommendations
Direct Equivalents (Recommended for Pin-Compatible Replacement):
MMSZ3V3T1G, MMSZ4684T1G, CMHZ5226B TR PBFREE, DDZ9684-7, MMSZ5226B-7-F, and MMSZ5226B_R1_00001 are functionally equivalent to MMSZ5226B-TP. All maintain 3.3 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, SOD-123 package, and ROHS3 compliance. These parts are suitable for direct substitution in applications where the original part is unavailable.
Automotive-Grade Alternatives:
SZMMSZ3V3T1G and SZMMSZ4684T1G are automotive-qualified variants (AEC-Q101) from onsemi, providing identical electrical specifications with enhanced reliability for automotive applications. These are appropriate for designs requiring automotive-grade components.
Limited Substitutes (Reduced Power Rating):
BZT52C3V3T-7 (Diodes Incorporated) and PZU3.3BA,115 (Nexperia USA Inc.) maintain 3.3 V Zener voltage and ±5% to ±6% tolerance but feature reduced maximum power dissipation (300 mW and 320 mW respectively). These are suitable for applications where thermal constraints or circuit requirements permit lower power ratings. BZT52C3V3T-7 uses SOD-523 package; PZU3.3BA,115 uses SOD-323 package. Both require PCB layout verification for mechanical compatibility.
Packaging Format Considerations:
MMSZ4684T1G is supplied in Cut Tape & Digi-Reel format rather than standard Tape & Reel. MMSZ5226B-7-F is also supplied in Cut Tape & Digi-Reel format. These formats are suitable for applications with lower volume requirements or where component handling equipment supports alternative tape formats.
Temperature Range Extension:
CMHZ5226B TR PBFREE, DDZ9684-7, and MMSZ5226B-7-F extend the operating temperature range to -65°C to 150°C, providing enhanced low-temperature performance compared to the standard -55°C to 150°C range of MMSZ5226B-TP.
All substitute parts listed maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and Active product status.
Frequently Asked Questions (FAQ)
Q: Can MMSZ3V3T1G be used as a direct replacement for MMSZ5226B-TP?
A: Yes. MMSZ3V3T1G matches all critical electrical parameters: 3.3 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, SOD-123 package, and ROHS3 compliance. The impedance (95 Ohms vs. 28 Ohms) and reverse leakage current (5 µA vs. 25 µA) differ, but these variations remain within acceptable ranges for most circuit applications. Verification against specific circuit requirements is necessary.
Q: What is the difference between MMSZ5226B-TP and SZMMSZ3V3T1G?
A: Both parts share identical electrical specifications (3.3 V, ±5%, 500 mW, SOD-123). The primary difference is grade classification: MMSZ5226B-TP is commercial-grade, while SZMMSZ3V3T1G is automotive-grade with AEC-Q101 qualification. Automotive-grade parts undergo additional qualification testing and are required for automotive applications.
Q: Why does BZT52C3V3T-7 have a lower power rating (300 mW vs. 500 mW)?
A: BZT52C3V3T-7 is designed for applications with lower power dissipation requirements. The reduced power rating reflects the device's thermal design and package capability. This part is suitable only for circuits where the maximum power dissipation does not exceed 300 mW.
Q: Can PZU3.3BA,115 replace MMSZ5226B-TP in a surface mount design?
A: PZU3.3BA,115 maintains the same Zener voltage (3.3 V) and tolerance (±5%), but uses SOD-323 package instead of SOD-123. The SOD-323 package has different footprint dimensions and pin spacing. PCB layout and component placement must be verified for mechanical compatibility. Additionally, the power rating is reduced to 320 mW.
Q: What does ±6% tolerance in BZT52C3V3T-7 mean compared to ±5% in MMSZ5226B-TP?
A: Tolerance specifies the allowable deviation from the nominal Zener voltage. ±5% tolerance on 3.3 V allows Zener voltage between 3.135 V and 3.465 V. ±6% tolerance allows 3.102 V to 3.498 V. The wider tolerance in BZT52C3V3T-7 permits greater voltage variation and may affect circuit performance in applications with tight voltage regulation requirements.
Q: Are MMSZ4684T1G and MMSZ5226B-7-F suitable for high-volume production?
A: MMSZ4684T1G is supplied in Cut Tape & Digi-Reel format, and MMSZ5226B-7-F is supplied in Cut Tape & Digi-Reel format. These packaging formats are appropriate for applications with moderate to lower volume requirements. Standard Tape & Reel format (used by MMSZ5226B-TP, MMSZ3V3T1G, and others) is typically preferred for high-volume automated assembly. Verify component handling equipment compatibility with alternative tape formats.
Q: What is the significance of reverse leakage current differences (25 µA vs. 5 µA)?
A: Reverse leakage current specifies the small current flowing through the Zener diode when reverse-biased below the Zener voltage. Lower leakage current (5 µA) indicates better reverse blocking performance and lower power consumption in standby conditions. Higher leakage current (25 µA) results in slightly higher standby power dissipation. Selection depends on application power budget requirements.
Q: Can automotive-grade parts (SZMMSZ series) be used in non-automotive applications?
A: Yes. Automotive-grade parts exceed commercial-grade specifications and are fully compatible with non-automotive applications. Using automotive-grade components in non-automotive designs provides enhanced reliability margin but may increase component cost.
Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?
A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. The device can be stored and handled without special moisture control measures, and there are no time-to-reflow limitations after package opening. This simplifies supply chain and manufacturing logistics.
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