MZP4741ARLG Zener Diode Equivalent & Substitute Parts

Part Overview

The MZP4741ARLG is an 11V 3W axial-mounted zener diode manufactured by onsemi, designed for voltage regulation and protection applications in through-hole circuit designs. This component is classified as obsolete, necessitating identification of functionally equivalent substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain the same nominal zener voltage (11V), tolerance (±5%), and through-hole axial mounting configuration while accommodating variations in power dissipation ratings and package specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5	%
Power - Max	3	W
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	5 µA @ 8.4 V	µA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the MZP4741ARLG is determined by the following critical parameters:

Primary Substitution Criteria:

Nominal zener voltage of 11V (±5% tolerance required)
Through-hole axial mounting configuration
Operating temperature range compatibility (-65°C minimum, 200°C maximum preferred)
DO-204AL or DO-41 package compatibility

Secondary Considerations:

Power dissipation rating (3W nominal; substitutes may have lower ratings for lower-power applications or higher ratings for enhanced thermal margin)
Impedance characteristics (8 Ohms maximum for MZP4741ARLG)
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are grouped into three categories based on power rating alignment:

Category A - Lower Power (1W to 1.5W): Suitable for applications where the original 3W rating exceeds thermal requirements. These parts maintain voltage regulation capability with reduced power dissipation.

Category B - Equivalent Power (1.3W to 1.5W): Intermediate power ratings providing moderate thermal margin.

Category C - Higher Power (5W): Suitable for applications requiring enhanced thermal performance or higher current handling.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
MZP4741ARLG	onsemi	11 V	±5%	3 W	8 Ω	1.5 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Obsolete
1N4741A	Lumimax Optoelectronic Technology	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N5348BRLG	onsemi	11 V	±5%	5 W	2.5 Ω	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Active
BZX85C11	Taiwan Semiconductor Corporation	11 V	±5%	1.3 W	8 Ω	1.2 V @ 10 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4466	Microchip Technology	11 V	±5%	1.5 W	6 Ω	1.5 V @ 1 A	-65 to 175°C	DO-204AL, DO-41	Active
1N4698	Microchip Technology	11 V	±5%	500 mW	—	1.1 V @ 200 mA	-65 to 175°C	DO-204AA, DO-7	Active
1N4741A,113	Nexperia USA Inc.	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4741A,133	NXP Semiconductors	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4741AGE3	Microchip Technology	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 175°C	DO-204AL, DO-41	Active
1N4741AP/TR12	Microchip Technology	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N4741AP/TR8	Microchip Technology	11 V	±5%	1 W	8 Ω	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active

Engineering Selection Recommendations

Primary Substitute (Direct Replacement):

The 1N4741A,113 (Nexperia USA Inc.) and 1N4741A,133 (NXP Semiconductors) are the most direct substitutes for the MZP4741ARLG. Both parts maintain identical nominal zener voltage (11V), tolerance (±5%), impedance (8 Ohms), and operating temperature range (-65 to 200°C). Although rated at 1W versus the original 3W, these parts are functionally equivalent for applications where thermal dissipation does not require the full 3W capacity. Both are in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Alternative Substitutes for Lower-Power Applications:

The 1N4741A (Lumimax Optoelectronic Technology) and 1N4741AGE3 (Microchip Technology) provide equivalent electrical characteristics with 1W power ratings. The Lumimax variant maintains the full -65 to 200°C operating range, while the Microchip variant operates to 175°C maximum. Both are active products suitable for designs where thermal margin is not critical.

Substitute for Enhanced Thermal Performance:

The 1N5348BRLG (onsemi) offers 5W power dissipation with identical 11V nominal voltage and ±5% tolerance. This part is suitable for applications requiring higher current handling or enhanced thermal margin. The impedance is reduced to 2.5 Ohms, providing lower dynamic resistance. Package configuration is T-18 axial, maintaining through-hole compatibility. This part is in active production with ROHS3 compliance.

Intermediate Power Rating Option:

The BZX85C11 (Taiwan Semiconductor Corporation) provides 1.3W power rating with matching 11V voltage and ±5% tolerance. Impedance remains at 8 Ohms. This part is in active production with ROHS3 compliance and maintains the full -65 to 200°C operating range.

Lower Power Alternatives:

The 1N4466 (Microchip Technology) and 1N4698 (Microchip Technology) are suitable for applications with reduced power requirements. The 1N4466 provides 1.5W at 11V with 6 Ohms impedance but operates only to 175°C. The 1N4698 provides 500mW in a DO-7 package, suitable only for minimal power dissipation applications.

Compliance Considerations:

Parts with ROHS3 compliance (1N5348BRLG, BZX85C11, 1N4741A,113, 1N4741A,133) are preferred for new designs. Parts with RoHS non-compliant status (1N4466, 1N4698, 1N4741AP/TR8, 1N4741AP/TR12) may be restricted in certain applications or regions.

Frequently Asked Questions (FAQ)

Q: Can the 1W-rated 1N4741A substitute for the 3W MZP4741ARLG in all applications?

A: The 1N4741A is electrically equivalent at 11V nominal voltage and ±5% tolerance. Substitution is valid when the application's actual power dissipation does not exceed 1W. If the circuit requires sustained power dissipation above 1W, thermal stress on the 1W device will reduce reliability. Verify actual circuit power requirements before substitution.

Q: What is the difference between 1N4741A variants from different manufacturers?

A: All 1N4741A variants maintain identical electrical specifications: 11V nominal, ±5% tolerance, 1W power rating, 8 Ohms impedance, and -65 to 200°C operating range. Differences exist in packaging format (Tape & Reel versus Bulk), compliance certifications (ROHS3 versus non-compliant), and inventory availability. Selection should prioritize active production status and compliance requirements for the target application.

Q: Is the 1N5348BRLG (5W) a direct replacement for the MZP4741ARLG (3W)?

A: The 1N5348BRLG maintains the same 11V nominal voltage and ±5% tolerance, making it electrically compatible. The 5W rating provides enhanced thermal margin. However, the impedance is reduced to 2.5 Ohms (versus 8 Ohms), and the package is T-18 axial. Physical board layout may require adjustment. This part is suitable when higher power dissipation capability is beneficial.

Q: Why do some substitutes have lower operating temperature maximums (175°C versus 200°C)?

A: Operating temperature range is a specified parameter that varies by manufacturer and product line. Parts rated to 175°C maximum are suitable for applications where junction temperature does not exceed this limit. For designs requiring operation to 200°C, select substitutes explicitly rated to this temperature (1N4741A variants from Lumimax, Nexperia, or NXP; 1N5348BRLG; BZX85C11).

Q: What does the impedance (Zzt) parameter indicate for zener diode substitution?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode in the reverse-biased region. Lower impedance indicates better voltage regulation stability under varying load conditions. The MZP4741ARLG specifies 8 Ohms maximum. Most 1W substitutes maintain 8 Ohms, while the 1N5348BRLG (5W) has 2.5 Ohms, providing superior regulation. The 1N4466 has 6 Ohms, providing slightly better regulation than the original.

Q: Are tape and reel (TR) packaged parts functionally identical to bulk-packaged parts?

A: Tape and reel packaging is a manufacturing and distribution format only. Electrical specifications and functional performance are identical between TR and bulk packaging for the same part number. Selection between TR and bulk depends on production volume requirements and inventory management practices, not electrical compatibility.

Q: Can the 1N4698 (500mW, DO-7 package) substitute for the MZP4741ARLG?

A: The 1N4698 maintains 11V nominal voltage and ±5% tolerance, providing electrical compatibility. However, the 500mW power rating is significantly lower than the original 3W, and the DO-7 package differs from the DO-41 axial package. This part is suitable only for low-power applications where power dissipation is minimal and board layout accommodates the different package footprint.

Q: What compliance certifications should be prioritized for new designs?

A: ROHS3 compliance is the current standard for new electronic component designs. Parts with ROHS3 certification (1N5348BRLG, BZX85C11, 1N4741A,113, 1N4741A,133) are preferred. RoHS non-compliant parts may face restrictions in certain markets or applications. All listed substitutes maintain REACH Unaffected status and EAR99 export classification, consistent with the original MZP4741ARLG.

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