MMXZ5256B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMXZ5256B-TP is a 30 V, 200 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-323 packaging. This component is classified as Active and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and mechanical compatibility requirements. Alternative sources are necessary to address inventory availability, lead time constraints, or specific application requirements such as automotive qualification or enhanced power dissipation capabilities.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Power - Max	200	mW
Tolerance	±5%	-
Impedance (Max)	49	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 23 V
Voltage - Forward (Max)	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 are classified into two categories based on electrical parameter alignment with the MMXZ5256B-TP:

Direct Equivalents maintain identical or near-identical specifications across all critical parameters: nominal zener voltage (30 V), power dissipation (200 mW), tolerance (±5%), and SOD-323 packaging. These parts are pin-compatible and functionally interchangeable without circuit modification.

Functional Alternatives share the same nominal zener voltage (30 V) and surface mount technology but differ in one or more secondary parameters such as power rating, tolerance, impedance, or package variant (SOD-323F). These parts are suitable for applications where the enhanced or alternative specifications provide equivalent or superior performance.

Substitution eligibility is determined by:

Matching nominal zener voltage (30 V)
Power rating equal to or exceeding 200 mW
Surface mount configuration
ROHS3 compliance
Active product status

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Package	Packaging Type
MMXZ5256B-TP	Micro Commercial Co	30 V	200 mW	±5%	49 Ω	100 nA @ 23 V	1.2 V @ 100 mA	-55 to 150°C	SOD-323	Tape & Reel
MMSZ5256BS-7-F	Diodes Incorporated	30 V	200 mW	±5%	49 Ω	100 nA @ 23 V	900 mV @ 10 mA	-65 to 150°C	SOD-323	Tape & Reel
DDZ9713S-7	Diodes Incorporated	30 V	200 mW	±5%	Not specified	50 nA @ 22.8 V	900 mV @ 10 mA	-65 to 150°C	SOD-323	Cut Tape & Digi-Reel
MM3Z30VC	Fairchild Semiconductor	30 V	200 mW	±5%	75 Ω	45 nA @ 21 V	1 V @ 10 mA	-65 to 150°C	SOD-323F	Bulk
MM3Z30VB	onsemi	30 V	200 mW	±2%	75 Ω	45 nA @ 21 V	1 V @ 10 mA	-65 to 150°C	SOD-323F	Cut Tape & Digi-Reel
PZU30BA,115	Nexperia USA Inc.	30 V	320 mW	±5%	40 Ω	50 nA @ 23 V	1.1 V @ 100 mA	-55 to 150°C	SOD-323	Tape & Reel
BZX84J-B30,115	Nexperia USA Inc.	30 V	550 mW	±2%	40 Ω	50 nA @ 21 V	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	Tape & Reel

Engineering Selection Recommendations

MMSZ5256BS-7-F (Diodes Incorporated) is the primary direct equivalent. This part matches all critical electrical parameters of the MMXZ5256B-TP, including 30 V nominal voltage, 200 mW power rating, ±5% tolerance, and 49 Ω impedance. The extended operating temperature range (-65 to 150°C versus -55 to 150°C) provides additional thermal margin. Both parts are ROHS3 compliant and Active status. This substitution requires no circuit modification.

DDZ9713S-7 (Diodes Incorporated) is functionally equivalent with identical voltage, power, and tolerance specifications. The lower reverse leakage current (50 nA versus 100 nA) and extended temperature range (-65°C minimum) represent performance improvements. Packaging is available in Cut Tape & Digi-Reel format. ROHS3 compliant and Active status.

PZU30BA,115 (Nexperia USA Inc.) provides enhanced power dissipation at 320 mW while maintaining 30 V nominal voltage and ±5% tolerance. This part is suitable for applications requiring higher power handling. SOD-323 package maintains mechanical compatibility. ROHS3 compliant and Active status.

BZX84J-B30,115 (Nexperia USA Inc.) offers the highest power rating at 550 mW with improved tolerance (±2%) and lower impedance (40 Ω). This part includes AEC-Q101 automotive qualification. Package variant is SOD-323F. ROHS3 compliant and Active status. Use this part when automotive-grade reliability is required or when higher power dissipation is necessary.

MM3Z30VB (onsemi) and MM3Z30VC (Fairchild Semiconductor) maintain 30 V voltage and 200 mW power specifications with improved tolerance (±2% for MM3Z30VB). Both use SOD-323F package variant. These parts are suitable where tighter tolerance is beneficial. ROHS3 compliant and Active status.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5256BS-7-F directly replace MMXZ5256B-TP without circuit modification?

A: Yes. MMSZ5256BS-7-F is a direct equivalent with matching nominal zener voltage (30 V), power rating (200 mW), tolerance (±5%), and impedance (49 Ω). Both use SOD-323 packaging. The extended temperature range of MMSZ5256BS-7-F provides additional operational margin.

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

A: SOD-323 and SOD-323F are both surface mount packages for small signal diodes. SOD-323F is a variant designation used by certain manufacturers. Both are mechanically compatible in standard SOD-323 footprints. Verify PCB layout compatibility with your specific design requirements.

Q: Can I use BZX84J-B30,115 as a substitute for higher power applications?

A: Yes. BZX84J-B30,115 provides 550 mW power dissipation compared to the MMXZ5256B-TP specification of 200 mW. The nominal zener voltage remains 30 V. This part is suitable for applications requiring enhanced power handling. Verify that the SOD-323F package footprint is compatible with your PCB design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of MMXZ5256B-TP. All parts are classified as Active products.

Q: What is the significance of tolerance differences between ±5% and ±2%?

A: Tolerance specifies the allowable deviation of the nominal zener voltage from the specified 30 V value. ±5% tolerance allows deviation of ±1.5 V (28.5 V to 31.5 V). ±2% tolerance restricts deviation to ±0.6 V (29.4 V to 30.6 V). Applications requiring tighter voltage regulation benefit from ±2% tolerance parts such as MM3Z30VB or BZX84J-B30,115.

Q: Does reverse leakage current affect substitution compatibility?

A: Reverse leakage current is a secondary parameter. All listed parts maintain leakage currents in the range of 45 to 100 nA, which is acceptable for standard zener diode applications. Lower leakage current (as in MM3Z30VB at 45 nA) represents improved performance but does not prevent substitution.

Q: Can I substitute parts with different packaging types (Tape & Reel versus Cut Tape)?

A: Packaging type refers to the supply format (how the component is delivered), not the physical package. Both Tape & Reel and Cut Tape & Digi-Reel formats contain components in SOD-323 or SOD-323F packages. Substitution is valid from a functional standpoint. Verify that your assembly process accommodates the supplied format.

Q: Is automotive qualification (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive applications. BZX84J-B30,115 carries this qualification. For non-automotive applications, AEC-Q101 qualification is not necessary. All parts meet standard industrial reliability requirements.

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