MMXZ5235B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMXZ5235B-TP is a 6.8 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. Equivalent and substitute parts are identified based on matching or exceeding electrical specifications within the 6.8 V zener voltage class, maintaining surface mount compatibility, and supporting the same or broader operating temperature ranges. Substitutes are necessary when primary inventory is unavailable, when higher power ratings are required for thermal margin, or when alternative manufacturers provide improved availability or cost structure.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 5 V
Voltage - Forward (Max) @ If	1.2	V @ 100 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the MMXZ5235B-TP is based on the following criteria:

Primary Substitution Criteria (Direct Equivalents):

Zener voltage within 6.8 V nominal specification
Power rating equal to or greater than 200 mW
Tolerance equal to or tighter than ±5%
Surface mount packaging (SOD-323 or SOD-323F)
Operating temperature range encompassing -55°C to 150°C minimum
RoHS3 compliance and unlimited MSL rating

Secondary Substitution Criteria (Functional Alternatives):

Zener voltage within 6.79 V to 6.84 V range (within ±2% of nominal 6.8 V)
Power rating 250 mW or higher for enhanced thermal margin
Tolerance ±2% to ±5%
Extended operating temperature ranges (-65°C to 150°C or higher)
Automotive-grade qualification (AEC-Q101) where applicable

Parts are grouped by substitution tier based on electrical parameter alignment and packaging compatibility. All substitute parts maintain active product status and full regulatory compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Temp Range	Status
MMXZ5235B-TP	Micro Commercial Co	6.8 V	±5%	200 mW	5 Ω	SOD-323	-55 to 150°C	Active
MMSZ5235BS-7-F	Diodes Incorporated	6.8 V	±5%	200 mW	5 Ω	SOD-323	-65 to 150°C	Active
DDZ9692S-7	Diodes Incorporated	6.8 V	±5%	200 mW	—	SOD-323	-65 to 150°C	Active
BZX84J-B6V8,115	Nexperia USA Inc.	6.8 V	±2%	550 mW	15 Ω	SOD-323F	-65 to 150°C	Active
BZX84J-C6V8,115	Nexperia USA Inc.	6.8 V	±5%	550 mW	15 Ω	SOD-323F	-65 to 150°C	Active
CMDZ5235B TR PBFREE	Central Semiconductor Corp	6.8 V	±5%	250 mW	5 Ω	SOD-323	-65 to 150°C	Active
CMDZ6V8 TR PBFREE	Central Semiconductor Corp	6.8 V	±5%	250 mW	15 Ω	SOD-323	-65 to 175°C	Active
D3Z6V8BF-7	Diodes Incorporated	6.79 V	±2%	400 mW	40 Ω	SOD-323F	-65 to 150°C	Active
DDZ6V8CSF-7	Diodes Incorporated	6.84 V	±3%	500 mW	30 Ω	SOD-323F	-65 to 150°C	Active
MM3Z6V8B	onsemi	6.8 V	±2%	200 mW	14 Ω	SOD-323F	-65 to 150°C	Active
MM3Z6V8C	Fairchild Semiconductor	6.8 V	±5%	200 mW	14 Ω	SOD-323F	-65 to 150°C	Active

Engineering Selection Recommendations

Tier 1: Direct Electrical Equivalents

MMSZ5235BS-7-F (Diodes Incorporated) and DDZ9692S-7 (Diodes Incorporated) provide direct electrical equivalence to MMXZ5235B-TP with identical 6.8 V nominal voltage, ±5% tolerance, and 200 mW power rating in SOD-323 packaging. Both parts extend the operating temperature range to -65°C, providing enhanced low-temperature performance. Both maintain RoHS3 compliance and unlimited MSL rating. MMSZ5235BS-7-F specifies forward voltage characteristics at 10 mA, while DDZ9692S-7 provides reduced reverse leakage current (100 nA @ 5.1 V versus 3 µA @ 5 V). Selection between these parts depends on circuit requirements for reverse leakage performance.

Tier 2: Enhanced Power Rating Substitutes

CMDZ5235B TR PBFREE and CMDZ6V8 TR PBFREE (Central Semiconductor Corp) provide 250 mW power rating with 6.8 V nominal voltage and ±5% tolerance. Both parts support extended operating temperature ranges (-65°C to 150°C and -65°C to 175°C respectively) and maintain SOD-323 packaging compatibility. These parts are suitable for applications requiring additional thermal margin beyond the 200 mW specification. CMDZ6V8 TR PBFREE extends maximum operating temperature to 175°C.

Tier 3: Higher Power Density Alternatives

BZX84J-B6V8,115 and BZX84J-C6V8,115 (Nexperia USA Inc.) provide 550 mW power rating in SOD-323F packaging with 6.8 V nominal voltage. BZX84J-B6V8,115 specifies ±2% tolerance, while BZX84J-C6V8,115 maintains ±5% tolerance matching the original part. Both parts carry AEC-Q101 automotive qualification and support -65°C to 150°C operating range. Package transition from SOD-323 to SOD-323F requires PCB layout verification for mechanical fit.

Tier 4: Voltage-Adjacent Alternatives

D3Z6V8BF-7 (6.79 V, ±2%, 400 mW) and DDZ6V8CSF-7 (6.84 V, ±3%, 500 mW) provide zener voltages within ±2% of the 6.8 V nominal specification. Both parts are packaged in SOD-323F and support -65°C to 150°C operating range. These parts are suitable for applications where voltage tolerance is non-critical and higher power dissipation capability is required.

Tier 5: Tighter Tolerance Equivalents

MM3Z6V8B (onsemi) and MM3Z6V8C (Fairchild Semiconductor) provide 6.8 V nominal voltage with 200 mW power rating in SOD-323F packaging. MM3Z6V8B specifies ±2% tolerance with reduced impedance (14 Ω maximum), while MM3Z6V8C maintains ±5% tolerance. Both parts support -65°C to 150°C operating range. These parts are suitable for applications requiring tighter voltage tolerance or improved impedance characteristics.

All substitute parts maintain active product status, RoHS3 compliance, and unlimited MSL rating. Package transitions from SOD-323 to SOD-323F require verification of PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5235BS-7-F directly replace MMXZ5235B-TP in existing designs?

A: Yes. MMSZ5235BS-7-F provides identical electrical specifications (6.8 V, ±5%, 200 mW) in the same SOD-323 package. The extended operating temperature range (-65°C versus -55°C minimum) provides additional performance margin. No circuit modifications are required.

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

A: SOD-323 and SOD-323F are both surface mount packages with identical electrical performance but differ in physical dimensions. SOD-323F has a slightly larger footprint. PCB layout verification is required when transitioning between these packages to confirm pad compatibility and trace routing.

Q: Why would I select a higher power rating substitute like BZX84J-B6V8,115 (550 mW) over the original 200 mW part?

A: Higher power rating substitutes provide thermal margin in applications with sustained current flow or elevated ambient temperatures. The 550 mW rating allows operation at higher junction temperatures before reaching maximum power dissipation limits. This extends component life and improves reliability in thermally constrained designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and unlimited MSL rating, matching the regulatory status of MMXZ5235B-TP.

Q: What is the significance of ±2% tolerance versus ±5% tolerance?

A: Tolerance specifies the allowable deviation from nominal zener voltage. ±2% tolerance (6.64 V to 6.96 V) provides tighter voltage regulation compared to ±5% tolerance (6.46 V to 7.14 V). Selection depends on circuit requirements for voltage accuracy. Applications requiring precise voltage reference benefit from ±2% tolerance parts.

Q: Can I use DDZ6V8CSF-7 (6.84 V) in place of MMXZ5235B-TP (6.8 V)?

A: DDZ6V8CSF-7 operates at 6.84 V nominal, which is 0.59% above the 6.8 V specification. This voltage difference is within ±2% tolerance but outside the ±5% tolerance band of the original part. Substitution is acceptable only if circuit design tolerates the higher voltage output. Verify voltage regulation requirements before selection.

Q: What is the advantage of CMDZ6V8 TR PBFREE with -65°C to 175°C operating range?

A: Extended maximum operating temperature to 175°C allows operation in high-temperature environments without derating. This is beneficial for automotive applications, industrial equipment, or designs with elevated ambient conditions. The 250 mW power rating combined with extended temperature range provides enhanced thermal performance.

Q: Are automotive-qualified parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive applications or designs subject to automotive reliability standards. BZX84J-B6V8,115 and BZX84J-C6V8,115 carry this qualification. For non-automotive applications, AEC-Q101 qualification is not necessary but provides additional assurance of manufacturing process control and reliability testing.

Q: What does impedance (Zzt) represent in zener diode specifications?

A: Impedance (Zzt) is the dynamic impedance of the zener diode in the reverse bias region. Lower impedance values indicate better voltage regulation and reduced output ripple. MMXZ5235B-TP specifies 5 Ω maximum impedance. Substitutes with higher impedance (14 Ω to 40 Ω) may exhibit slightly higher output voltage ripple but remain functionally compatible for most applications.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts maintain identical electrical specifications and regulatory compliance. Mixing manufacturers is acceptable from an electrical standpoint. However, verify that all parts are sourced from authorized distributors and maintain consistent quality certifications.

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