MMXZ5237B-TP Zener Diode 8.2V 200mW SOD-323 Equivalent & Substitute Parts

Part Overview

The MMXZ5237B-TP is an 8.2V 200mW Zener diode manufactured by Micro Commercial Co in SOD-323 surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching or superior electrical specifications within the same package family, enabling direct replacement or design flexibility in voltage regulation and protection circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Tolerance	±5%	—
Power - Maximum	200	mW
Impedance (Maximum)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6.5V
Voltage - Forward (Maximum) @ If	1.2	V @ 100mA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOD-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 8.2V nominal
Package type: SOD-323 or SOD-323F (compatible footprints)
Tolerance: ±5% or tighter (±2%)
Power rating: 200mW minimum
Surface mount configuration

Substitution Logic: Parts are grouped into two categories based on electrical equivalence:

Category 1 - Direct Equivalents (200mW, 8.2V, ±5%): Parts with identical zener voltage, tolerance, and power rating. These provide pin-for-pin replacement capability with no circuit redesign required.

Category 2 - Enhanced Specifications (200mW or higher, 8.2V, ±2% or ±5%): Parts with superior impedance characteristics, tighter voltage tolerance, or higher power ratings. These are suitable for applications requiring improved performance margins or automotive-grade reliability.

Category 3 - Higher Power Variants (250mW–550mW, 8.2V): Parts with increased power dissipation capability. These are applicable when thermal headroom or higher current handling is required, provided circuit layout accommodates the alternative package variant.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr	Package	Temp Range (°C)	Grade
MMXZ5237B-TP	Micro Commercial Co	8.2	±5%	200	8	3 µA @ 6.5V	SOD-323	-55 to 150	Commercial
MMSZ5237BS-7-F	Diodes Incorporated	8.2	±5%	200	8	3 µA @ 6.5V	SOD-323	-65 to 150	Commercial
BZX384B8V2-E3-08	Vishay General Semiconductor	8.2	±2%	200	15	700 nA @ 5V	SOD-323	-55 to 150	Commercial
BZX384B8V2-HE3-08	Vishay General Semiconductor	8.2	±2%	200	15	700 nA @ 5V	SOD-323	-55 to 150	Automotive AEC-Q101
BZX384C8V2-HE3-08	Vishay General Semiconductor	8.2	±5%	200	15	700 nA @ 5V	SOD-323	-55 to 150	Automotive AEC-Q101
BZX384C8V2-HE3-18	Vishay General Semiconductor	8.2	±5%	200	15	700 nA @ 5V	SOD-323	-55 to 150	Automotive AEC-Q101
BZX84J-C8V2,115	Nexperia USA Inc.	8.2	±5%	550	10	700 nA @ 5V	SOD-323F	-65 to 150	Automotive AEC-Q101
CMDZ5237B TR PBFREE	Central Semiconductor Corp	8.2	±5%	250	8	3 µA @ 6.5V	SOD-323	-65 to 150	Commercial
CMDZ8V2 TR PBFREE	Central Semiconductor Corp	8.2	±5%	250	15	700 nA @ 5V	SOD-323	-65 to 175	Commercial
DDZ8V2CSF-7	Diodes Incorporated	8.24	±3%	500	30	7.5 µA @ 7.63V	SOD-323F	-65 to 150	Commercial
DDZ9694S-7	Diodes Incorporated	8.2	±5%	200	Not specified	100 nA @ 6.2V	SOD-323	-65 to 150	Commercial

Engineering Selection Recommendations

Direct Replacement (No Circuit Modification Required):

MMSZ5237BS-7-F (Diodes Incorporated) and DDZ9694S-7 (Diodes Incorporated) are direct electrical equivalents with identical zener voltage (8.2V), tolerance (±5%), and power rating (200mW). Both are Active status products with RoHS3 compliance. MMSZ5237BS-7-F extends the operating temperature range to -65°C, providing improved low-temperature performance. DDZ9694S-7 features significantly lower reverse leakage current (100nA vs. 3µA), beneficial for precision voltage reference applications.

Enhanced Performance Substitutes (Tighter Tolerance, Lower Leakage):

BZX384B8V2-E3-08 and BZX384C8V2-HE3-08 (Vishay) offer ±2% voltage tolerance compared to the original ±5%, with substantially lower reverse leakage (700nA vs. 3µA). These are suitable for applications requiring improved voltage regulation accuracy. The BZX384 series variants with -HE3 suffix include AEC-Q101 automotive qualification, enabling use in automotive and mission-critical applications.

Higher Power Capability (Thermal Margin Enhancement):

CMDZ5237B TR PBFREE and CMDZ8V2 TR PBFREE (Central Semiconductor) provide 250mW power rating versus 200mW, offering 25% additional thermal headroom. CMDZ8V2 extends the upper operating temperature to 175°C. BZX84J-C8V2,115 (Nexperia) provides 550mW power in SOD-323F package with AEC-Q101 qualification, suitable for high-dissipation applications.

Automotive-Grade Alternatives:

BZX384B8V2-HE3-08, BZX384C8V2-HE3-08, BZX384C8V2-HE3-18, and BZX84J-C8V2,115 all carry AEC-Q101 qualification. These are appropriate for automotive, industrial, and safety-critical applications requiring documented reliability and qualification testing.

Package Compatibility Note:

SOD-323F variants (BZX84J-C8V2,115 and DDZ8V2CSF-7) have identical electrical footprint to SOD-323 but with enhanced mechanical robustness. Verify PCB layout compatibility before substitution.

Frequently Asked Questions (FAQ)

Q1: Can MMSZ5237BS-7-F replace MMXZ5237B-TP directly on the PCB?

Yes. Both parts share identical zener voltage (8.2V), tolerance (±5%), power rating (200mW), and SOD-323 package. Pin configuration and footprint are identical. No circuit modification is required.

Q2: What is the advantage of BZX384B8V2-E3-08 over the original part?

BZX384B8V2-E3-08 provides ±2% voltage tolerance (versus ±5%), resulting in tighter voltage regulation. Reverse leakage is reduced to 700nA (versus 3µA), improving circuit performance in precision applications. Operating temperature range is identical.

Q3: When should I use the higher power variants (250mW or 550mW)?

Higher power ratings provide additional thermal margin in applications with sustained or peak current dissipation. Use 250mW variants when the original 200mW part approaches thermal limits. Use 550mW variants for high-current protection circuits or when extended temperature operation is required.

Q4: Are automotive-grade parts (AEC-Q101) compatible with commercial applications?

Yes. Automotive-grade parts exceed commercial specifications and are fully backward compatible. They are appropriate for any application requiring enhanced reliability, regardless of automotive use.

Q5: What is the difference between SOD-323 and SOD-323F packages?

Both packages have identical electrical footprint and pin configuration. SOD-323F provides enhanced mechanical robustness and is preferred for high-reliability applications. Verify PCB layout supports the slightly larger physical dimensions of SOD-323F before substitution.

Q6: Can DDZ8V2CSF-7 replace MMXZ5237B-TP?

DDZ8V2CSF-7 is functionally compatible with 8.24V nominal (versus 8.2V) and ±3% tolerance. The 0.04V difference is within acceptable margins for most applications. However, the SOD-323F package requires PCB layout verification. Higher power (500mW) and impedance (30 Ohms) differ significantly; use only if circuit design accommodates these parameters.

Q7: Which substitute offers the lowest reverse leakage current?

DDZ9694S-7 features the lowest reverse leakage at 100nA @ 6.2V, compared to 3µA for the original part. This is beneficial for precision voltage reference and low-power standby circuits.

Q8: What compliance certifications apply to all listed parts?

All parts are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export control. Moisture sensitivity level is 1 (unlimited) for all variants. Automotive-grade variants carry AEC-Q101 qualification.

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