MMXZ5229B-TP Zener Diode 4.3V 200mW SOD-323 Equivalent & Substitute Parts

Part Overview

The MMXZ5229B-TP is a 4.3V Zener diode manufactured by Micro Commercial Co, rated for 200mW power dissipation in a surface mount SOD-323 package. This component is classified as Active product status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative sourcing improves supply chain resilience, or when design requirements permit functional equivalents with identical or superior electrical characteristics within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.3	V
Tolerance	±5%	—
Power - Maximum	200	mW
Impedance (Maximum)	22	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1V
Voltage - Forward (Maximum) @ If	1.2	V @ 100mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMXZ5229B-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 4.3V nominal (tolerance range 4.085V to 4.515V at ±5%)
Power rating: minimum 200mW (equal or greater)
Package: SOD-323 or SOD-323F (mechanically compatible)
Mounting: Surface Mount
Temperature range: must encompass -55°C to 150°C minimum
Compliance: RoHS3, MSL 1

Secondary Compatibility Parameters:

Impedance (Zzt): values up to 22 Ohms preferred; higher impedance acceptable if voltage regulation requirements permit
Reverse leakage current: 5µA @ 1V or lower
Forward voltage: 1.2V @ 100mA or lower

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications and package) and Functional Equivalents (same zener voltage and power rating with acceptable parameter variations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ 1V	Vf (Max) @ If	Temp Range	Package	Status
MMXZ5229B-TP	Micro Commercial Co	4.3V	±5%	200mW	22Ω	5µA	1.2V @ 100mA	-55 to 150°C	SOD-323	Active
MMSZ5229BS-7-F	Diodes Incorporated	4.3V	±5%	200mW	22Ω	5µA	900mV @ 10mA	-65 to 150°C	SOD-323	Active
BZT52C4V3SQ-7-F	Diodes Incorporated	4.3V	±6.98%	200mW	90Ω	3µA	900mV @ 10mA	-65 to 150°C	SOD-323	Active
BZX384C4V3-E3-08	Vishay General Semiconductor	4.3V	±5%	200mW	90Ω	3µA	—	-55 to 150°C	SOD-323	Active
BZX84J-B4V3,115	Nexperia USA Inc.	4.3V	±2%	550mW	90Ω	3µA	1.1V @ 100mA	-65 to 150°C	SOD-323F	Active
BZX84J-C4V3,115	Nexperia USA Inc.	4.3V	±5%	550mW	90Ω	3µA	1.1V @ 100mA	-65 to 150°C	SOD-323F	Active
CMDZ4L3 TR PBFREE	Central Semiconductor Corp	4.3V	±5%	250mW	900Ω	5µA	900mV @ 10mA	-65 to 150°C	SOD-323	Active
D3Z4V3BF-7	Diodes Incorporated	4.33V	±4%	400mW	90Ω	3µA	1.1V @ 100mA	-65 to 150°C	SOD-323F	Discontinued
DDZ4V3BSF-7	Diodes Incorporated	4.3V	±3%	500mW	130Ω	10µA	900mV @ 10mA	-65 to 150°C	SOD-323F	Active
MM3Z4V3B	Fairchild Semiconductor	4.3V	±2%	200mW	84Ω	2.7µA	1V @ 10mA	-65 to 150°C	SOD-323F	Active
MM3Z4V3C	Fairchild Semiconductor	4.3V	±5%	200mW	84Ω	2.7µA	1V @ 10mA	-65 to 150°C	SOD-323F	Active

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

MMSZ5229BS-7-F (Diodes Incorporated) is the primary direct equivalent. It matches the MMXZ5229B-TP in zener voltage (4.3V), tolerance (±5%), power rating (200mW), and impedance (22Ω). The extended temperature range (-65 to 150°C) provides superior thermal coverage. Product status is Active with full RoHS3 compliance and MSL 1 rating. This part is suitable for direct substitution without circuit redesign.

Functional Equivalents (Acceptable Substitutes):

BZX384C4V3-E3-08 (Vishay) and MM3Z4V3C (Fairchild) are functionally equivalent with matching zener voltage and power rating. Both maintain ±5% tolerance and RoHS3 compliance. Higher impedance values (90Ω and 84Ω respectively) are acceptable in most applications where voltage regulation is not critically dependent on low dynamic impedance. Both are Active status products.

Higher Power Alternatives (When Thermal Margin Required):

DDZ4V3BSF-7, BZX84J-B4V3,115, and BZX84J-C4V3,115 provide 500mW to 550mW power ratings, offering increased thermal headroom. These are suitable when circuit design permits higher power dissipation capability. All maintain 4.3V zener voltage and RoHS3 compliance. Package variants (SOD-323F) are mechanically compatible with SOD-323 footprints in most PCB designs.

Not Recommended:

D3Z4V3BF-7 is marked Discontinued at DiGi Electronics and should not be selected for new designs despite acceptable electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5229BS-7-F replace MMXZ5229B-TP directly without circuit modification?

A: Yes. MMSZ5229BS-7-F is electrically equivalent with identical zener voltage (4.3V), tolerance (±5%), power rating (200mW), and impedance (22Ω). The extended operating temperature range (-65 to 150°C versus -55 to 150°C) is a performance enhancement. Both use SOD-323 packaging. No circuit changes are required.

Q: What is the difference between SOD-323 and SOD-323F packages?

A: SOD-323 and SOD-323F are mechanically compatible surface mount packages with identical footprints. SOD-323F is a variant designation used by some manufacturers. Both fit standard SOD-323 PCB pads. Package designation does not affect electrical substitution eligibility.

Q: Why do some substitute parts have higher impedance values (90Ω vs 22Ω)?

A: Impedance (Zzt) affects dynamic voltage regulation under load transients. Lower impedance (22Ω) provides better voltage stability during rapid current changes. Higher impedance (90Ω) is acceptable in applications where load current is stable or where voltage regulation tolerance is not critical. Verify circuit requirements before selecting high-impedance alternatives.

Q: Are the Nexperia BZX84J series parts (550mW) suitable replacements?

A: BZX84J-B4V3,115 and BZX84J-C4V3,115 are functionally compatible with superior power ratings (550mW). They maintain 4.3V zener voltage and RoHS3 compliance. Use these parts when thermal analysis indicates the 200mW rating is marginal. Package is SOD-323F, which is mechanically compatible. Verify PCB layout accommodates the variant package if required.

Q: Can I use MM3Z4V3B (±2% tolerance) instead of MM3Z4V3C (±5% tolerance)?

A: Yes. MM3Z4V3B offers tighter tolerance (±2% versus ±5%), which is a performance improvement for voltage regulation accuracy. Both parts are 4.3V, 200mW, Active status, and RoHS3 compliant. MM3Z4V3B is suitable for applications requiring higher voltage precision.

Q: What is the inventory status of substitute parts?

A: MMSZ5229BS-7-F has 9200 pcs in stock. BZX384C4V3-E3-08 has 13698 pcs. DDZ4V3BSF-7 has 27400 pcs. MM3Z4V3C has 3100 pcs. All listed Active status parts maintain current inventory. Verify real-time availability with your supplier before final design selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All Active status substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original MMXZ5229B-TP specifications.

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