MMXZ5221B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMXZ5221B-TP is a 2.4 V, 200 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-323 packaging. This component is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating. 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 based on matching electrical characteristics and mechanical compatibility to ensure direct replacement capability in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.4	V
Tolerance	±5%	-
Power - Max	200	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	µA @ 1 V
Voltage - Forward (Max) @ If	1.2	V @ 100 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-323	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the MMXZ5221B-TP are classified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Zener voltage: 2.4 V nominal
Maximum power dissipation: 200 mW or greater
Tolerance: ±5% or tighter
Mounting type: Surface Mount
Package type: SOD-323 or SOD-323F (compatible footprints)
Operating temperature range: Minimum -55°C to +150°C or broader
RoHS3 compliance and REACH unaffected status

Substitution Categories:

Direct Equivalents (200 mW, SOD-323): Parts with identical power rating and standard SOD-323 package, maintaining the same electrical performance envelope.

Enhanced Performance Substitutes (Higher Power Rating): Parts rated at 500 mW or 550 mW with SOD-323 or SOD-323F packaging. These provide superior thermal performance and can be used in applications requiring higher power dissipation margins.

Precision Variants (Tighter Tolerance): Parts with ±2% or ±4% tolerance specifications instead of ±5%, offering improved voltage regulation accuracy where required.

Automotive Grade Options: Parts qualified to AEC-Q101 automotive standards for applications requiring automotive-grade reliability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ 1V (µA)	Temp Range (°C)	Package	Grade
MMXZ5221B-TP	Micro Commercial Co	2.4	±5%	200	30	100	-55 to 150	SOD-323	Standard
MMSZ5221BS-7-F	Diodes Incorporated	2.4	±5%	200	30	100	-65 to 150	SOD-323	Standard
BZX384B2V4-E3-08	Vishay General Semiconductor	2.4	±2%	200	100	50	-55 to 150	SOD-323	Standard
BZX384B2V4-G3-08	Vishay General Semiconductor	2.4	±2%	200	100	50	-55 to 150	SOD-323	Standard
BZX384B2V4-HE3-08	Vishay General Semiconductor	2.4	±2%	200	100	50	-55 to 150	SOD-323	Automotive AEC-Q101
BZX384C2V4-E3-08	Vishay General Semiconductor	2.4	±5%	200	100	50	-55 to 150	SOD-323	Standard
BZX84J-B2V4,115	Nexperia USA Inc.	2.4	±2%	550	100	50	-65 to 150	SOD-323F	Automotive AEC-Q101
BZX84J-C2V4,115	Nexperia USA Inc.	2.4	±5%	550	100	50	-65 to 150	SOD-323F	Automotive AEC-Q101
CMDZ5221B TR PBFREE	Central Semiconductor Corp	2.4	±5%	500	30	100	-65 to 200	SOD-323	Standard
GDZ2V4B-E3-08	Vishay General Semiconductor	2.4	±4%	200	100	120	-55 to 150	SOD-323	Standard
MM3Z2V4B	onsemi	2.4	±2%	200	94	45	-65 to 150	SOD-323F	Standard

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): MMSZ5221BS-7-F from Diodes Incorporated provides direct functional equivalence to MMXZ5221B-TP with identical electrical parameters. This part extends the lower operating temperature limit to -65°C, offering broader environmental compatibility while maintaining all other specifications.

Standard Grade Alternatives (200 mW, SOD-323): BZX384C2V4-E3-08 from Vishay General Semiconductor matches the ±5% tolerance and 200 mW power rating. This part features higher impedance (100 Ohms vs. 30 Ohms) and lower reverse leakage current (50 µA vs. 100 µA), providing improved voltage regulation characteristics in applications sensitive to dynamic impedance.

Precision Grade Alternatives (±2% Tolerance): BZX384B2V4-E3-08 and BZX384B2V4-G3-08 from Vishay General Semiconductor offer tighter ±2% tolerance specifications suitable for applications requiring enhanced voltage accuracy. Both maintain 200 mW power rating and SOD-323 packaging.

Automotive Grade Selection: BZX384B2V4-HE3-08 from Vishay General Semiconductor is qualified to AEC-Q101 automotive standards with ±2% tolerance and 200 mW rating. BZX84J-B2V4,115 and BZX84J-C2V4,115 from Nexperia USA Inc. provide automotive qualification with enhanced 550 mW power rating and SOD-323F packaging, suitable for high-reliability automotive applications.

Enhanced Power Dissipation: CMDZ5221B TR PBFREE from Central Semiconductor Corp provides 500 mW power rating with identical impedance (30 Ohms) and reverse leakage characteristics to the main part, extending the upper operating temperature to 200°C. BZX84J series parts offer 550 mW rating with automotive qualification.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original MMXZ5221B-TP.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5221BS-7-F replace MMXZ5221B-TP in all applications? A: Yes. MMSZ5221BS-7-F provides identical electrical specifications with extended lower temperature operation (-65°C vs. -55°C). The part is functionally equivalent for direct substitution in existing circuit designs.

Q: What is the difference between SOD-323 and SOD-323F packages? A: SOD-323F is a variant of SOD-323 with compatible footprint dimensions. Both packages are mechanically interchangeable on standard PCB layouts. SOD-323F is used by some manufacturers for specific product lines but maintains electrical equivalence.

Q: When should I select a ±2% tolerance part instead of ±5%? A: Select ±2% tolerance parts (BZX384B2V4 series, MM3Z2V4B) when circuit design requires tighter voltage regulation accuracy or when the application has narrow voltage tolerance bands. Standard ±5% parts are suitable for general-purpose voltage regulation and protection applications.

Q: Are automotive-grade parts (AEC-Q101) required for non-automotive applications? A: No. Automotive-grade parts are not required for non-automotive applications. However, they provide enhanced reliability and qualification testing. Standard grade parts are appropriate for consumer and industrial applications meeting the specified electrical parameters.

Q: What is the advantage of higher power-rated substitutes (500 mW or 550 mW)? A: Higher power-rated parts provide thermal margin in applications with variable or peak power dissipation. CMDZ5221B TR PBFREE (500 mW) and BZX84J series (550 mW) allow operation at higher current levels without exceeding thermal limits, extending component life in demanding applications.

Q: Can I use MM3Z2V4B as a substitute if my circuit requires SOD-323 footprint? A: MM3Z2V4B uses SOD-323F packaging, which is mechanically compatible with SOD-323 footprints. Verify PCB layout compatibility with your design specifications. The part provides ±2% tolerance and -65°C lower temperature operation.

Q: What is the significance of impedance (Zzt) differences between parts? A: Impedance affects dynamic voltage regulation performance. Lower impedance (30 Ohms in MMXZ5221B-TP and CMDZ5221B) provides better transient response. Higher impedance (100 Ohms in BZX384 series) is acceptable in applications with slower load changes. Select based on circuit transient requirements.

Q: Are all listed substitutes in active production status? A: Yes. All substitute parts listed are classified as active products with current manufacturing status and available inventory, ensuring long-term supply availability and design continuity.

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