MZP4729ARLG Equivalent & Substitute Parts

Part Overview

The MZP4729ARLG is a Zener diode manufactured by onsemi, rated at 3.6 V nominal voltage with 3 W maximum power dissipation. This component is designed for voltage regulation and protection applications in through-hole axial configurations. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	3.6 V
Tolerance	±5%
Power - Max	3 W
Impedance (Max)	10 Ohms
Current - Reverse Leakage @ Vr	100 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MZP4729ARLG is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.6 V nominal with ±5% tolerance
Mounting type: Through hole axial configuration
Package compatibility: DO-204AL or DO-41 axial format
Operating temperature range: Minimum -65°C to 200°C

Secondary Compatibility Factors:

Maximum power dissipation: Equal to or greater than 3 W (for direct replacement) or lower power ratings (for reduced-stress applications)
Impedance (Zzt): Maximum 10 Ohms or lower
Reverse leakage current: 100 µA @ 1 V or lower
Forward voltage: 1.5 V @ 200 mA or lower

All substitute parts listed maintain the 3.6 V zener voltage specification and ±5% tolerance. Variations in power rating, impedance, and leakage current are documented to enable selection based on specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Zzt (Max)	Leakage @ 1V	Vf (Max) @ If	Temp Range	Package	Status
MZP4729ARLG	onsemi	3.6 V	±5%	3 W	10 Ω	100 µA	1.5 V @ 200 mA	-65°C ~ 200°C	DO-41 Axial	Obsolete
1N4729A,113	Nexperia USA Inc.	3.6 V	±5%	1 W	10 Ω	100 µA	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Active
1N4729A,133	NXP USA Inc.	3.6 V	±5%	1 W	10 Ω	100 µA	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Active
2EZ3.6D5	Microsemi Corporation	3.6 V	±5%	2 W	5 Ω	80 µA	1.2 V @ 200 mA	-65°C ~ 150°C	DO-204AL (DO-41)	Active
BZV85-C3V6,113	NXP Semiconductors	3.6 V	±5%	1.3 W	15 Ω	50 µA	1 V @ 50 mA	-65°C ~ 200°C	DO-41	Active
BZV85-C3V6,133	NXP Semiconductors	3.6 V	±5%	1.3 W	15 Ω	50 µA	1 V @ 50 mA	-65°C ~ 200°C	DO-41	Active

Engineering Selection Recommendations

Direct Replacement Candidates:

The 2EZ3.6D5 (Microsemi Corporation) provides the closest functional match to the MZP4729ARLG with 2 W power rating, maintaining adequate margin below the original 3 W specification. This part is active and available in high inventory quantities. The operating temperature range extends to 150°C (versus 200°C on the original), which is acceptable for most applications. The impedance of 5 Ohms is superior to the original 10 Ohms specification.

Alternative Substitutes for Reduced-Stress Applications:

The 1N4729A variants (1N4729A,113 and 1N4729A,133) from Nexperia and NXP are active parts with identical electrical parameters to each other. These 1 W devices are suitable for applications where power dissipation does not approach the original 3 W rating. Both variants maintain the full -65°C to 200°C operating temperature range and are available in high inventory quantities.

The BZV85-C3V6 variants (BZV85-C3V6,113 and BZV85-C3V6,133) from NXP Semiconductors offer 1.3 W power rating with superior leakage characteristics (50 µA versus 100 µA). These parts maintain the full temperature range and are available in substantial quantities. The higher impedance (15 Ohms) should be evaluated against specific circuit requirements.

Compliance and Availability:

All substitute parts are active products with current manufacturing status. The 1N4729A,113 is RoHS3 compliant. The 2EZ3.6D5 is RoHS non-compliant. All parts maintain REACH unaffected status and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can the 1N4729A variants directly replace the MZP4729ARLG in all applications?

A: The 1N4729A variants maintain identical zener voltage (3.6 V), tolerance (±5%), impedance (10 Ohms), and operating temperature range (-65°C to 200°C). The primary difference is reduced power rating (1 W versus 3 W). Direct replacement is valid only when circuit power dissipation remains below 1 W. Applications requiring the full 3 W capability require the 2EZ3.6D5 alternative.

Q: What is the difference between 1N4729A,113 and 1N4729A,133?

A: Both variants are electrically identical with 3.6 V zener voltage, 1 W power rating, and ±5% tolerance. The designation suffix indicates packaging format: ,113 denotes Cut Tape (CT) packaging, while ,133 denotes Bulk packaging. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Why does the 2EZ3.6D5 have a lower maximum operating temperature (150°C versus 200°C)?

A: The 2EZ3.6D5 is specified with a 150°C maximum operating temperature, compared to 200°C for the MZP4729ARLG. This specification difference must be evaluated against the actual operating environment. Applications with ambient temperatures or component junction temperatures exceeding 150°C require alternative selections such as the 1N4729A or BZV85-C3V6 variants.

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

A: All substitute parts are through-hole axial configuration devices compatible with DO-204AL or DO-41 package specifications. Physical dimensions and lead spacing are consistent across all listed alternatives, enabling direct mechanical substitution on printed circuit boards designed for the MZP4729ARLG.

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

A: Impedance (Zzt) represents the dynamic impedance of the zener diode at the specified test current. Lower impedance values indicate better voltage regulation characteristics and reduced voltage variation across the operating current range. The 2EZ3.6D5 with 5 Ohms impedance provides superior regulation compared to the original 10 Ohms specification.

Q: Can the BZV85-C3V6 variants be used in high-current applications?

A: The BZV85-C3V6 variants are specified with forward voltage of 1 V @ 50 mA, indicating characterization at lower current levels compared to the 1.2 V @ 200 mA specification of the 1N4729A or 1.5 V @ 200 mA of the original MZP4729ARLG. Forward voltage behavior at higher currents (200 mA) requires circuit-specific evaluation.

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

A: Reverse leakage current indicates the small current flowing through the zener diode when reverse-biased below the zener voltage threshold. Lower leakage values (such as 50 µA in the BZV85-C3V6 versus 100 µA in the original) result in reduced power consumption in standby conditions and improved circuit efficiency. Selection depends on application sensitivity to leakage current.

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