Equivalent & Substitute Parts Reference for MMSZ5251C-TP

Part Overview

MMSZ5251C-TP from Micro Commercial Co is a surface-mount Zener diode classified under "Diodes, Zener" with nominal Zener voltage of 22 V, ±2% tolerance, and a maximum power dissipation of 500 mW. Its standard package is SOD-123. The part is active and available in bulk packaging. For electronics design and repair applications, sourcing equivalent and substitute models is often required to ensure inventory continuity and design flexibility. Substitution is strictly based on electrical and mechanical parameters according to the product category and part specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	MMSZ5251C-TP
Category	Diodes, Zener
Package / Case	SOD-123
Supplier Device Package	SOD-123
Mounting Type	Surface Mount
Voltage - Zener (Nom) (Vz)	22 V
Tolerance	±2%
Power - Max	500 mW
Impedance (Max) (Zzt)	29 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 17 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitution is determined by matching the following key parameters: Zener voltage (22 V), package/case (SOD-123 or equivalent), mounting type (surface mount), maximum power dissipation (500 mW or close as specified), tolerance (±2% to ±6%), impedance (≤55 Ohms), reverse leakage current (≤100 nA @ appropriate test voltage), forward voltage at the test current, and operating temperature range. Substitute grouping is strictly based on these electrical and mechanical characteristics to maintain compatibility and performance in applications where MMSZ5251C-TP is specified.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Mounting Type	Voltage - Zener (Nom) (Vz)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Product Status
MMSZ5251C-TP	Micro Commercial Co	SOD-123	Surface Mount	22 V	±2%	500 mW	29 Ohms	100 nA @ 17 V	900 mV @ 10 mA	-55°C ~ 150°C	Active
MMSZ5251C-E3-08	Vishay	SOD-123	Surface Mount	22 V	±2%	500 mW	29 Ohms	100 nA @ 17 V	-	-55°C ~ 150°C	Active
BZT52C22-7-F	Diodes Inc.	SOD-123	Surface Mount	22 V	±6%	500 mW	55 Ohms	100 nA @ 15.4 V	900 mV @ 10 mA	-65°C ~ 150°C	Active
BZT52C22-E3-08	Vishay	SOD-123	Surface Mount	22 V	±5%	410 mW	55 Ohms	100 nA @ 17 V	-	-55°C ~ 150°C	Active
DDZ22D-7	Diodes Inc.	SOD-123	Surface Mount	22 V	±3%	500 mW	30 Ohms	50 nA @ 17 V	900 mV @ 10 mA	-65°C ~ 150°C	Active
CMHZ5251B TR PBFREE	Central Semi	SOD-123	Surface Mount	22 V	±5%	500 mW	29 Ohms	100 nA @ 17 V	900 mV @ 10 mA	150°C	Active
DDZ9708-7	Diodes Inc.	SOD-123	Surface Mount	22 V	±5%	500 mW	-	50 nA @ 16.7 V	900 mV @ 10 mA	-65°C ~ 150°C (TJ)	Active
MMSZ4708T1G	onsemi	SOD-123	Surface Mount	22 V	±5%	500 mW	-	10 nA @ 16.7 V	900 mV @ 10 mA	-55°C ~ 150°C	Active
MMSZ5251BT1G	onsemi	SOD-123	Surface Mount	22 V	±5%	500 mW	29 Ohms	100 nA @ 17 V	900 mV @ 10 mA	-55°C ~ 150°C	Active
SZMMSZ5251ET1G	onsemi	SOD-123	Surface Mount	22 V	±5%	500 mW	29 Ohms	100 nA @ 17 V	900 mV @ 10 mA	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Select substitute parts based on matching product status (Active), compliance certifications (RoHS3, REACH Unaffected), and equivalent electrical, mechanical, and packaging parameters. All substitute parts listed are active and maintain regulatory and compliance equivalence, ensuring suitability for direct replacement in assemblies specifying MMSZ5251C-TP. Selection must remain within the allowed parameter ranges of Zener voltage, package/case, power, and mounting configuration.

Frequently Asked Questions (FAQ)

Q1: Which electrical characteristics must match for Zener diode substitution?
A1: Critical electrical characteristics for substitution include nominal Zener voltage, maximum power dissipation, tolerance, impedance, reverse leakage current at the test voltage, and forward voltage at the test current.

Q2: Does the package type matter for substitutes?
A2: Yes. Substitutes must match the mounting type (surface mount) and use SOD-123 or form-factor-equivalent cases unless explicitly permitted otherwise.

Q3: Can lower or higher tolerance substitutes be used?
A3: Substitute tolerance may differ (e.g., ±2% to ±6%) if application specifications allow, but selection criteria here follow strict matching based on provided parameter ranges.

Q4: Are compliance certifications relevant in substitution?
A4: Yes. All listed substitutes maintain RoHS3 and REACH compliance, with product status marked as active to ensure regulatory equivalence.

Q5: What is the effect of different maximum power ratings?
A5: Substitute selection must not exceed the specified maximum. Substitutes with lower power ratings should be evaluated against application needs; in this document only provided input parameters are used.

Q6: Are SOD-323 devices direct substitutes for SOD-123?
A6: SOD-323 is noted where explicitly listed in the input; selection must be made according to mechanical compatibility and allowed substitution logic in the input parameters.

Q7: How is operating temperature addressed?
A7: Substitute parts must support the same or broader operating temperature range as the main part according to the listed specifications.

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