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BZT52C4V3S-TP Zener Diode Equivalent & Substitute Parts
Part Overview
The BZT52C4V3S-TP is a 4.3 V Zener diode rated at 200 mW in a surface mount SOD-323 package, manufactured by Micro Commercial Co. This component is classified as Active and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 4.3 | V |
| Tolerance | ±7% | - |
| Power - Max | 200 | mW |
| Impedance (Max) | 90 | Ohms |
| Current - Reverse Leakage @ Vr | 3 | µA @ 1 V |
| Voltage - Forward (Vf) (Max) @ If | 900 | mV @ 10 mA |
| Operating Temperature | -65 to 150 | °C |
| Mounting Type | Surface Mount | - |
| Package / Case | SC-76, SOD-323 | - |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitution of the BZT52C4V3S-TP is determined by the following critical parameters:
Primary Substitution Criteria:
- Zener voltage: 4.3 V nominal
- Mounting type: Surface Mount
- Package compatibility: SOD-323 or SOD-323F
- Operating temperature range: Minimum -65°C to 150°C
- RoHS3 compliance and MSL rating
Secondary Substitution Criteria:
- Power dissipation rating: 200 mW or higher
- Voltage tolerance: ±7% or tighter
- Impedance: 90 Ohms or lower
- Reverse leakage current: 3 µA @ 1 V or lower
Substitute parts are grouped into three categories based on electrical performance alignment:
Direct Parametric Equivalents: Parts matching all primary criteria with identical or superior electrical specifications.
Similar Performance Substitutes: Parts with 4.3 V zener voltage and SOD-323 packaging but with variations in power rating, tolerance, or impedance that remain functionally compatible within the application envelope.
Automotive-Grade Alternatives: Parts meeting AEC-Q101 qualification for applications requiring automotive-grade reliability.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Ir @ 1V (µA) | Vf @ 10mA (mV) | Temp Range (°C) | Package | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| BZT52C4V3S-TP | Micro Commercial Co | 4.3 | ±7% | 200 | 90 | 3 | 900 | -65 to 150 | SOD-323 | Tape & Reel |
| MM3Z4V3T1G | onsemi | 4.3 | ±7% | 300 | 90 | 3 | 900 | -65 to 150 | SOD-323 | Tape & Reel |
| CMDZ4V3 TR PBFREE | Central Semiconductor Corp | 4.3 | ±5% | 250 | 90 | 1 | 900 | -65 to 175 | SOD-323 | Tape & Reel |
| DDZ4V3BSF-7 | Diodes Incorporated | 4.3 | ±3% | 500 | 130 | 10 | 900 | -65 to 150 | SOD-323F | Tape & Reel |
| MM3Z4V3B | Fairchild Semiconductor | 4.3 | ±2% | 200 | 84 | 2.7 | 1000 | -65 to 150 | SOD-323F | Bulk |
| MM3Z4V3C | Fairchild Semiconductor | 4.3 | ±5% | 200 | 84 | 2.7 | 1000 | -65 to 150 | SOD-323F | Bulk |
| MM3Z4V3ST1G | onsemi | 4.3 | ±3% | 300 | 90 | 3 | 900 | -65 to 150 | SOD-323 | Tape & Reel |
| MMSZ5229BS-7-F | Diodes Incorporated | 4.3 | ±5% | 200 | 22 | 5 | 900 | -65 to 150 | SOD-323 | Tape & Reel |
| SZMM3Z4V3ST1G | onsemi | 4.3 | - | 300 | 90 | 3 | 900 | -65 to 150 | SOD-323 | Cut Tape & Digi-Reel |
| UDZ4V3B-7 | Diodes Incorporated | 4.3 | ±3.02% | 200 | 100 | 5 | - | -65 to 150 | SOD-323 | Tape & Reel |
| BZT52C4V3S-7-F | Diodes Incorporated | 4.3 | ±7% | 200 | 90 | 3 | 900 | -65 to 150 | SOD-323 | Tape & Reel |
Engineering Selection Recommendations
Direct Parametric Equivalent:
BZT52C4V3S-7-F (Diodes Incorporated) is a direct parametric equivalent to the BZT52C4V3S-TP. Both parts share identical electrical specifications: 4.3 V zener voltage, ±7% tolerance, 200 mW power rating, 90 Ohms impedance, and SOD-323 packaging. Both are ROHS3 compliant with MSL 1 rating. This part is suitable for direct substitution in applications where the original specification is maintained.
Higher Power Alternatives:
MM3Z4V3T1G and MM3Z4V3ST1G (onsemi) provide 300 mW power dissipation while maintaining 4.3 V zener voltage, ±7% and ±3% tolerance respectively, and SOD-323 packaging. These parts are applicable in designs requiring increased thermal headroom or higher current handling capacity. MM3Z4V3ST1G includes AEC-Q101 automotive qualification.
Enhanced Tolerance Options:
CMDZ4V3 (Central Semiconductor Corp) offers ±5% tolerance with 250 mW power rating and extended operating temperature to 175°C. MM3Z4V3B and MM3Z4V3C (Fairchild Semiconductor) provide ±2% and ±5% tolerance respectively at 200 mW, with lower impedance (84 Ohms). These options are suitable for applications requiring tighter voltage regulation.
Automotive-Grade Selection:
SZMM3Z4V3ST1G (onsemi) is qualified to AEC-Q101 and rated at 300 mW with 4.3 V zener voltage. This part is specified for automotive applications requiring formal qualification documentation.
Packaging Considerations:
All recommended substitutes maintain surface mount compatibility. SOD-323F variants (DDZ4V3BSF-7, MM3Z4V3B, MM3Z4V3C) feature a slightly larger footprint than SOD-323 but remain compatible with standard surface mount assembly processes. Tape & Reel packaging is standard for production volumes; Bulk packaging (MM3Z4V3B, MM3Z4V3C) and Cut Tape & Digi-Reel (SZMM3Z4V3ST1G) are available for alternative supply chain requirements.
Compliance Status:
All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.
Frequently Asked Questions (FAQ)
Q: Can MM3Z4V3T1G replace BZT52C4V3S-TP directly?
A: Yes. MM3Z4V3T1G is a direct substitute with identical zener voltage (4.3 V), tolerance (±7%), and package (SOD-323). The higher power rating (300 mW vs. 200 mW) provides additional thermal margin and is functionally compatible. Both parts are ROHS3 compliant with MSL 1 rating.
Q: What is the difference between SOD-323 and SOD-323F packages?
A: SOD-323F is a variant of the SOD-323 package with slightly different physical dimensions. Both are surface mount packages suitable for automated assembly. SOD-323F variants (DDZ4V3BSF-7, MM3Z4V3B, MM3Z4V3C) are mechanically compatible with standard SOD-323 footprints on PCBs designed for either package type.
Q: Can I use CMDZ4V3 in place of BZT52C4V3S-TP?
A: Yes. CMDZ4V3 meets the primary substitution criteria with 4.3 V zener voltage, surface mount SOD-323 package, and operating temperature range of -65°C to 175°C. The ±5% tolerance is tighter than the original ±7%, and the 250 mW power rating exceeds the 200 mW requirement. This part is suitable for applications requiring improved voltage regulation accuracy.
Q: Is SZMM3Z4V3ST1G suitable for automotive applications?
A: Yes. SZMM3Z4V3ST1G carries AEC-Q101 automotive qualification and is rated at 300 mW with 4.3 V zener voltage. This part is specified for automotive-grade applications requiring formal qualification documentation and reliability assurance.
Q: What does the impedance (Zzt) parameter indicate?
A: Impedance (Zzt) represents the dynamic impedance of the zener diode in the reverse bias region. Lower impedance values indicate better voltage regulation performance and lower output impedance. The BZT52C4V3S-TP has 90 Ohms impedance. Substitutes with lower impedance (such as MM3Z4V3B and MM3Z4V3C at 84 Ohms, or MMSZ5229BS-7-F at 22 Ohms) provide superior voltage regulation characteristics.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance requirements of the original BZT52C4V3S-TP.
Q: What is the significance of reverse leakage current (Ir)?
A: Reverse leakage current indicates the small current flowing through the diode when reverse biased below the zener voltage. Lower leakage current values indicate better diode quality and lower power consumption in standby conditions. The BZT52C4V3S-TP specifies 3 µA @ 1 V. Substitutes with equal or lower leakage current (CMDZ4V3 at 1 µA, MM3Z4V3B and MM3Z4V3C at 2.7 µA) provide equivalent or superior performance.
Q: Can I substitute a 500 mW zener diode (DDZ4V3BSF-7) for the 200 mW original?
A: Yes. DDZ4V3BSF-7 is functionally compatible with 4.3 V zener voltage and SOD-323F package. The higher power rating (500 mW) provides increased thermal capacity. However, the impedance is higher (130 Ohms vs. 90 Ohms), which may affect voltage regulation performance in precision applications. Verify impedance requirements for your specific application.
Q: What packaging options are available for production volumes?
A: Tape & Reel (TR) packaging is standard for high-volume production and is available for most substitute parts. Bulk packaging is available for MM3Z4V3B and MM3Z4V3C. Cut Tape & Digi-Reel packaging is available for SZMM3Z4V3ST1G. Select packaging based on assembly process requirements and volume specifications.
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