MMSZ5243B Equivalent & Substitute Parts Reference

Part Overview

The MMSZ5243B, manufactured by SMC Diode Solutions, is an active Zener diode in the SOD-123 package category, rated for 13 V Zener voltage, 500 mW maximum power, and ±5% tolerance. It features RoHS3 compliance and a wide operating temperature range (-55°C to 150°C). Zener diodes are commonly used for voltage regulation and protection in electronic circuits.
Alternatives or substitutes are often required to address sourcing constraints, inventory management, or application-specific certification needs, while maintaining strict adherence to specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	MMSZ5243B
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	13 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	13 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.9 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Affected
ECCN	EAR99
HTSUS	8541.10.0050

Substitute Part Grouping Explanation

Substitute parts for MMSZ5243B are identified by strictly matching the following key parametric criteria:

Zener Voltage (13 V)
Tolerance (±5%)
Maximum Power Dissipation (500 mW)
Maximum Impedance (13 Ohms)
Reverse Leakage (500 nA @ 9.9 V)
Operating Temperature Range (-55°C ~ 150°C)
Mounting Type (Surface Mount)
Package / Case (SOD-123)
Compliance (RoHS3 and MSL 1)

Selection is limited to parts matching these explicit parameters and compliance statuses within the Diodes, Zener category.

Parameter Comparison

Parameter	MMSZ5243B SMC Diode Solutions	MMSZ5243B-AU_R1_000A1 Panjit International Inc.	MMSZ5243BHE3-TP Micro Commercial Co	MMSZ5243B_R1_00001 Panjit International Inc.
Voltage - Zener (Nom) (Vz)	13 V	13 V	13 V	13 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	13 Ohms	13 Ohms	13 Ohms	13 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Operating Grade / Qualification	-	Automotive / AEC-Q101	Automotive / AEC-Q101	-
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.10.0050	8541.10.0050	8541.10.0050	8541.10.0050

Engineering Selection Recommendations

All listed substitute parts are active Zener diodes within the same package category, maintaining identical electrical and mechanical characteristics to MMSZ5243B.
All are specified as ROHS3 compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited), suitable for use where lead-free and moisture robustness is required.
Automotive grade (AEC-Q101 qualification) is available in MMSZ5243B-AU_R1_000A1 and MMSZ5243BHE3-TP.
REACH status and compliance should be matched to application needs where required.

Frequently Asked Questions (FAQ)

Q1: What parameters determine whether MMSZ5243B can be directly substituted?
A1: Substitution is strictly based on the following: Zener voltage, tolerance, power rating, impedance, reverse leakage, operating temperature, package/case type, mounting type, RoHS status, and MSL.

Q2: Are substitute parts compatible in terms of footprint and assembly?
A2: All substitutes listed use SOD-123 package with surface mount configuration, ensuring mechanical and footprint compatibility.

Q3: When is it necessary to select a substitute with AEC-Q101 certification?
A3: Select automotive grade (AEC-Q101) substitutes such as MMSZ5243B-AU_R1_000A1 or MMSZ5243BHE3-TP only when required for automotive or high reliability applications.

Q4: Is there any difference in electrical performance among these substitutes?
A4: Based on provided parameters, all listed substitutes match the electrical specifications of the MMSZ5243B.

Q5: How does REACH status affect the selection?
A5: REACH status should be matched to application and regulatory requirements, with substitutes available in both affected and unaffected statuses.

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