MMXZ5240B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMXZ5240B-TP is a 10 V, 200 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-323 packaging. This component is classified as Active and maintains full RoHS3 compliance with unlimited moisture sensitivity rating. The part is supplied in Tape & Reel packaging format.

Equivalent and substitute parts are identified based on matching or exceeding the core electrical specifications: nominal zener voltage of 10 V, power dissipation capability, forward voltage characteristics, and operating temperature range. Substitutes may vary in packaging format (SOD-323 versus SOD-323F), impedance characteristics, and reverse leakage current specifications while maintaining functional compatibility within the defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 100 mA
Operating Temperature	-55 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 logic for the MMXZ5240B-TP is based on the following critical parameters:

Primary Matching Criteria:

Nominal zener voltage: 10 V
Voltage tolerance: ±5% or tighter
Power dissipation: 200 mW minimum
Operating temperature range: -55°C to 150°C minimum
Surface mount configuration
RoHS3 compliance

Secondary Compatibility Factors:

Package format: SOD-323 or SOD-323F (both acceptable)
Impedance (Zzt): 10 to 30 Ohms (within functional range)
Reverse leakage current: 100 nA to 7.5 µA (acceptable variance)
Forward voltage: 900 mV to 1.2 V @ specified current

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Specifications): Parts matching all primary criteria with minimal parameter variance, suitable for direct replacement without circuit redesign.

Functional Equivalents (Enhanced Specifications): Parts exceeding power dissipation or offering improved impedance characteristics while maintaining the 10 V nominal voltage and core electrical performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
MMXZ5240B-TP	Micro Commercial Co	10 V	±5%	200 mW	17 Ω	1.2 V @ 100 mA	-55 to 150°C	SOD-323	Active
MMSZ5240BS-7-F	Diodes Incorporated	10 V	±5%	200 mW	17 Ω	900 mV @ 10 mA	-65 to 150°C	SOD-323	Active
DDZ9697S-7	Diodes Incorporated	10 V	±5%	200 mW	—	900 mV @ 10 mA	-65 to 150°C	SOD-323	Active
MM3Z10VB	onsemi	10 V	±2%	200 mW	18 Ω	1 V @ 10 mA	-65 to 150°C	SOD-323F	Active
MM3Z10VC	Fairchild Semiconductor	10 V	±5%	200 mW	18 Ω	1 V @ 10 mA	-65 to 150°C	SOD-323F	Active
PZU10BA,115	Nexperia USA Inc.	10 V	±5%	320 mW	10 Ω	1.1 V @ 100 mA	-55 to 150°C	SOD-323	Active
PZU10B,115	Nexperia USA Inc.	10 V	±5%	310 mW	10 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	Active
D3Z10BF-7	Diodes Incorporated	10 V	±2%	400 mW	10 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	Active
BZX84J-C10,115	Nexperia USA Inc.	10 V	±5%	550 mW	10 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	Active
BZX84J-B10,115	Nexperia USA Inc.	10 V	±2%	550 mW	10 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	Active
DDZ10CSF-7	Diodes Incorporated	9.95 V	±3%	500 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	SOD-323F	Discontinued

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

MMSZ5240BS-7-F (Diodes Incorporated) and DDZ9697S-7 (Diodes Incorporated) are functionally equivalent to MMXZ5240B-TP. Both maintain 10 V nominal voltage, ±5% tolerance, and 200 mW power rating. Both are Active status products with RoHS3 compliance. MMSZ5240BS-7-F extends the operating temperature range to -65°C, providing enhanced low-temperature performance. DDZ9697S-7 offers improved reverse leakage characteristics (100 nA @ 7.6 V versus 3 µA @ 8 V).

Enhanced Performance Substitutes (Higher Power Dissipation):

PZU10BA,115 (Nexperia USA Inc.) provides 320 mW power dissipation with matching -55°C to 150°C temperature range and SOD-323 packaging. This part is suitable for applications requiring additional thermal margin while maintaining identical voltage specifications.

PZU10B,115 (Nexperia USA Inc.) offers 310 mW power dissipation with extended -65°C lower temperature limit and AEC-Q100 automotive qualification.

D3Z10BF-7 (Diodes Incorporated) provides 400 mW power dissipation with ±2% voltage tolerance and improved impedance (10 Ω). This part is suitable for designs requiring tighter voltage regulation.

BZX84J-C10,115 (Nexperia USA Inc.) and BZX84J-B10,115 (Nexperia USA Inc.) offer 550 mW power dissipation with AEC-Q101 automotive qualification. BZX84J-B10,115 includes ±2% voltage tolerance.

Tolerance Considerations:

MM3Z10VB (onsemi) and BZX84J-B10,115 (Nexperia USA Inc.) provide ±2% voltage tolerance, tighter than the MMXZ5240B-TP specification of ±5%. These parts are suitable for applications requiring improved voltage regulation accuracy.

Package Format Considerations:

MMXZ5240B-TP uses SOD-323 packaging. Substitutes using SOD-323F packaging (MM3Z10VB, MM3Z10VC, PZU10B,115, D3Z10BF-7, BZX84J-C10,115, BZX84J-B10,115) are physically compatible with SOD-323 footprints in most applications, though PCB layout verification is required.

Avoid:

DDZ10CSF-7 is marked as Discontinued at DiGi Electronics and should not be selected for new designs despite functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5240BS-7-F directly replace MMXZ5240B-TP without circuit modification?

A: Yes. Both parts share identical electrical specifications: 10 V nominal voltage, ±5% tolerance, 200 mW power rating, and 17 Ω maximum impedance. MMSZ5240BS-7-F extends the operating temperature range to -65°C, which is a superset of the original -55°C specification. Both are RoHS3 compliant with MSL 1 rating.

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

A: SOD-323 and SOD-323F are both surface mount diode packages with identical electrical performance. SOD-323F is a variant designation used by certain manufacturers. Both packages are mechanically compatible with standard SOD-323 PCB footprints. Verify footprint compatibility with your PCB design documentation before substitution.

Q: Why would I select a higher power-rated substitute like D3Z10BF-7 (400 mW) instead of the original 200 mW part?

A: Higher power-rated substitutes provide thermal margin in applications where the component operates near its maximum power dissipation limit. D3Z10BF-7 also offers ±2% voltage tolerance versus ±5%, improving voltage regulation accuracy. Selection depends on circuit requirements and thermal design considerations.

Q: Are automotive-qualified parts (AEC-Q101, AEC-Q100) compatible with non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed the electrical and reliability specifications required for non-automotive applications. Parts such as BZX84J-C10,115 (AEC-Q101) and PZU10B,115 (AEC-Q100) are suitable for general-purpose use and provide additional qualification assurance.

Q: What does ±2% versus ±5% voltage tolerance mean for circuit design?

A: Voltage tolerance specifies the allowable deviation from the nominal 10 V zener voltage. ±5% tolerance allows 9.5 V to 10.5 V operation, while ±2% tolerance allows 9.8 V to 10.2 V operation. Tighter tolerance (±2%) is required in applications with strict voltage regulation requirements. Looser tolerance (±5%) is acceptable in applications with wider voltage margins.

Q: Can I use MM3Z10VC (Fairchild Semiconductor) if it is supplied in Bulk packaging instead of Tape & Reel?

A: MM3Z10VC electrical specifications match MMXZ5240B-TP requirements. However, packaging format (Bulk versus Tape & Reel) affects handling, storage, and assembly processes. Verify that your manufacturing process and component handling procedures support Bulk packaging before substitution.

Q: What is reverse leakage current and why does it vary among substitutes?

A: Reverse leakage current is the small current flowing through the zener diode when reverse-biased below the zener voltage. Typical values range from 100 nA to 7.5 µA depending on the manufacturer and process. Lower leakage current (100 nA) indicates better device quality and lower power consumption in standby conditions. Higher leakage (3 µA to 7.5 µA) is still within acceptable limits for most applications.

Q: Is DDZ10CSF-7 available for new designs?

A: No. DDZ10CSF-7 is marked as Discontinued at DiGi Electronics. Although it meets electrical specifications, discontinued parts should not be selected for new designs due to supply uncertainty and potential long-term availability issues. Select from Active status alternatives such as MMSZ5240BS-7-F, DDZ9697S-7, or enhanced-performance options.

Q: What does RoHS3 compliance mean?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component meets European Union environmental regulations restricting the use of hazardous materials including lead, cadmium, mercury, and certain flame retardants. All listed substitutes maintain RoHS3 compliance, ensuring regulatory compatibility.

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