MMSZ5241B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5241B-TP is an 11 V, 500 mW Zener diode manufactured by Micro Commercial Co in SOD-123 surface mount packaging. This component is classified as Active and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits where precise voltage clamping is required. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	22	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 8.4 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5241B-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 11 V
Power - Max: 500 mW (or higher)
Package / Case: SOD-123
Mounting Type: Surface Mount
Tolerance: ±5% (or tighter)

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 150°C minimum
Voltage - Forward (Max) @ If: 900 mV @ 10 mA
RoHS3 Compliance

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all primary matching criteria with identical or superior electrical performance characteristics.

Similar Substitutes: Parts with the same nominal voltage and package but with variations in power dissipation, impedance, or tolerance that may require circuit evaluation for specific applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Grade
MMSZ5241B-TP	Micro Commercial Co	11 V	±5%	500 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard
MMSZ11T1G	onsemi	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard
MMSZ4698T1G	onsemi	11 V	±5%	500 mW	—	50 nA @ 8.4 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard
SZMMSZ11T1G	onsemi	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive (AEC-Q101)
SZMMSZ4698T1G	onsemi	11 V	±5%	500 mW	—	50 nA @ 8.4 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive (AEC-Q101)
BZT52C11-7-F	Diodes Incorporated	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Standard
BZT52B11-E3-18	Vishay General Semiconductor	11 V	±2%	410 mW	15 Ω	100 nA @ 8.5 V	—	-65 to 150°C	SOD-123	Standard
BZT52C11-E3-08	Vishay General Semiconductor	11 V	±5%	410 mW	20 Ω	100 nA @ 8.5 V	—	-55 to 150°C	SOD-123	Standard
BZT52C11Q-7-F	Diodes Incorporated	11 V	±5.45%	370 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Automotive (AEC-Q101)
DDZ11B-7	Diodes Incorporated	10.78 V	±3%	500 mW	10 Ω	100 nA @ 8.4 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Standard
DDZ9698-7	Diodes Incorporated	11 V	±5%	500 mW	—	50 nA @ 8.4 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Standard

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

The following parts are direct substitutes for the MMSZ5241B-TP and meet all primary electrical and mechanical specifications:

MMSZ11T1G (onsemi): Identical voltage, tolerance, and power rating. Lower reverse leakage current (100 nA vs. 2 µA) indicates superior performance. ROHS3 compliant, Active status.
MMSZ4698T1G (onsemi): Identical voltage, tolerance, and power rating. Lower reverse leakage current (50 nA). ROHS3 compliant, Active status.
BZT52C11-7-F (Diodes Incorporated): Identical voltage, tolerance, and power rating. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant, Active status.
DDZ9698-7 (Diodes Incorporated): Identical voltage, tolerance, and power rating. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant, Active status.

Automotive-Grade Substitutes (AEC-Q101 Qualified):

For applications requiring automotive qualification:

SZMMSZ11T1G (onsemi): AEC-Q101 qualified. Identical voltage, tolerance, and power rating. Lower reverse leakage current (100 nA). ROHS3 compliant, Active status.
SZMMSZ4698T1G (onsemi): AEC-Q101 qualified. Identical voltage, tolerance, and power rating. Lower reverse leakage current (50 nA). ROHS3 compliant, Active status.
BZT52C11Q-7-F (Diodes Incorporated): AEC-Q101 qualified. Voltage and tolerance within specification. Reduced power rating (370 mW vs. 500 mW) requires circuit evaluation. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant, Active status.

Similar Substitutes (Conditional Use):

The following parts have variations in key parameters and require circuit-level evaluation:

BZT52B11-E3-18 (Vishay): Tighter tolerance (±2%) and lower power rating (410 mW). Lower impedance (15 Ω). Extended operating temperature range (-65°C to 150°C). ROHS3 compliant, Active status.
BZT52C11-E3-08 (Vishay): Lower power rating (410 mW) requires circuit evaluation. Identical tolerance and impedance to direct substitutes. ROHS3 compliant, Active status.
DDZ11B-7 (Diodes Incorporated): Nominal voltage deviation (10.78 V vs. 11 V) with tighter tolerance (±3%). Lower impedance (10 Ω). Extended operating temperature range (-65°C to 150°C). ROHS3 compliant, Active status.

All substitute parts are ROHS3 compliant and carry Active product status, ensuring continued availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MMSZ11T1G be used as a direct replacement for MMSZ5241B-TP?

A: Yes. Both parts share identical nominal voltage (11 V), tolerance (±5%), power rating (500 mW), and SOD-123 package. The MMSZ11T1G exhibits lower reverse leakage current, which represents improved performance. Both are ROHS3 compliant and Active status.

Q: What is the difference between standard and automotive-grade substitutes?

A: Automotive-grade substitutes (SZMMSZ11T1G, SZMMSZ4698T1G, BZT52C11Q-7-F) carry AEC-Q101 qualification, indicating compliance with automotive reliability and quality standards. Standard-grade parts do not carry this qualification. Selection depends on application requirements.

Q: Can BZT52C11Q-7-F replace MMSZ5241B-TP despite lower power rating?

A: BZT52C11Q-7-F has a reduced power rating (370 mW vs. 500 mW). Substitution is conditional and requires circuit evaluation to confirm that the application does not exceed the lower power dissipation limit. The part is AEC-Q101 qualified and meets voltage and tolerance specifications.

Q: Why does DDZ11B-7 have a different nominal voltage?

A: DDZ11B-7 has a nominal voltage of 10.78 V with ±3% tolerance, resulting in a voltage range of 10.46 V to 11.10 V. This overlaps with the MMSZ5241B-TP range (10.45 V to 11.55 V). The tighter tolerance and lower impedance may be advantageous in some applications but require circuit verification.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use SOD-123 surface mount packaging. However, packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) may differ. Verify packaging compatibility with assembly equipment and procurement requirements.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects circuit performance in high-impedance applications. Lower reverse leakage (50 nA to 100 nA in substitutes vs. 2 µA in MMSZ5241B-TP) reduces parasitic current paths and improves circuit stability. This represents superior performance in most applications.

Q: Can I use BZT52B11-E3-18 if my circuit requires 500 mW power dissipation?

A: BZT52B11-E3-18 has a maximum power rating of 410 mW, which is below the 500 mW specification of MMSZ5241B-TP. Substitution requires circuit evaluation to confirm that actual power dissipation does not exceed 410 mW under all operating conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry Active product status, ensuring regulatory compliance and continued availability.

Q: What is the operating temperature range difference between substitutes?

A: MMSZ5241B-TP operates from -55°C to 150°C. Several substitutes (BZT52C11-7-F, BZT52C11Q-7-F, DDZ11B-7, DDZ9698-7) extend the lower temperature limit to -65°C. This provides additional margin in cold-temperature applications. The upper limit remains 150°C across all parts.

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