MZP4729AG Equivalent & Substitute Parts

Part Overview

The MZP4729AG is a 3.6 V, 3 W Zener diode manufactured by onsemi in a through-hole axial package (DO-204AL/DO-41). This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MZP4729AG is determined by the following critical parameters: nominal Zener voltage (3.6 V), voltage tolerance (±5%), maximum power dissipation capability, impedance characteristics, reverse leakage current, forward voltage drop, operating temperature range, and through-hole axial mounting configuration.

Substitute parts are grouped into two categories:

Category 1: Lower Power Substitutes (1 W - 1.3 W) Parts 1N4729A,113, 1N4729A,133, and BZV85-C3V6,113/133 share identical Zener voltage and tolerance specifications but operate at reduced maximum power levels. These substitutes are suitable for applications where the full 3 W dissipation capability of the MZP4729AG is not required.

Category 2: Intermediate Power Substitute (2 W) Part 2EZ3.6D5 provides 2 W maximum power dissipation, positioning it between lower-power alternatives and the original 3 W specification. This part exhibits improved impedance characteristics (5 Ohms versus 10 Ohms) and lower reverse leakage current (80 µA versus 100 µA).

Category 3: Parametric Equivalent (3 W) Part MZP4729ARL is a direct parametric equivalent manufactured by onsemi, maintaining identical electrical specifications and power rating while offering active product status and improved availability.

Parameter Comparison

Parameter	MZP4729AG	1N4729A,113	1N4729A,133	2EZ3.6D5	BZV85-C3V6,113	BZV85-C3V6,133	MZP4729ARL
Manufacturer	onsemi	Nexperia USA Inc.	NXP USA Inc.	Microsemi Corporation	NXP Semiconductors	NXP Semiconductors	onsemi
Voltage - Zener (Nom)	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V
Tolerance	±5%	±5%	±5%	±5%	±5%	±5%	±5%
Power - Max	3 W	1 W	1 W	2 W	1.3 W	1.3 W	3 W
Impedance (Max)	10 Ohms	10 Ohms	10 Ohms	5 Ohms	15 Ohms	15 Ohms	10 Ohms
Current - Reverse Leakage @ Vr	100 µA @ 1 V	100 µA @ 1 V	100 µA @ 1 V	80 µA @ 1 V	50 µA @ 1 V	50 µA @ 1 V	100 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1 V @ 50 mA	1 V @ 50 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 150°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: MZP4729ARL

The MZP4729ARL is the preferred substitute for the obsolete MZP4729AG. This part is manufactured by onsemi and maintains identical electrical specifications across all critical parameters: 3.6 V nominal Zener voltage, 3 W maximum power dissipation, ±5% tolerance, 10 Ohms maximum impedance, and -65°C to 200°C operating temperature range. The MZP4729ARL carries active product status with significantly higher inventory availability (99,827 units) and RoHS3 compliance certification. This substitute provides direct functional equivalence without design modification.

Secondary Recommendation: 2EZ3.6D5

The 2EZ3.6D5 manufactured by Microsemi Corporation is suitable for applications where power dissipation does not exceed 2 W. This part offers superior impedance characteristics (5 Ohms) and lower reverse leakage current (80 µA) compared to the original specification. The operating temperature range extends to 150°C, which is acceptable for most applications within the -65°C to 200°C envelope of the MZP4729AG. High inventory availability (29,595 units) supports production continuity.

Tertiary Recommendations: 1N4729A,113 / 1N4729A,133 / BZV85-C3V6,113 / BZV85-C3V6,133

These lower-power alternatives (1 W to 1.3 W) are applicable only to designs where maximum power dissipation requirements do not exceed their respective ratings. All four parts maintain the 3.6 V Zener voltage and ±5% tolerance specification. The 1N4729A variants are available from Nexperia USA Inc. and NXP USA Inc. with active product status. The BZV85-C3V6 variants from NXP Semiconductors offer reduced reverse leakage current (50 µA) but exhibit higher impedance (15 Ohms). These substitutes require verification that circuit power dissipation remains within the reduced power envelope.

Frequently Asked Questions (FAQ)

Q: Can the MZP4729AG be directly replaced with the MZP4729ARL?

A: Yes. The MZP4729ARL is a parametric equivalent with identical electrical specifications: 3.6 V nominal Zener voltage, 3 W maximum power dissipation, ±5% tolerance, 10 Ohms impedance, and -65°C to 200°C operating temperature. Both parts use through-hole axial packaging. No circuit modifications are required.

Q: What is the primary difference between the MZP4729AG and lower-power substitutes?

A: The MZP4729AG is rated for 3 W maximum power dissipation. Substitutes such as 1N4729A (1 W) and BZV85-C3V6 (1.3 W) are rated for lower power levels. Selection of lower-power alternatives requires confirmation that circuit power dissipation does not exceed the substitute part's maximum rating.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts listed use through-hole axial mounting in DO-204AL/DO-41 packages. Physical dimensions and lead spacing are compatible with the original MZP4729AG footprint. No PCB redesign is necessary.

Q: What is the significance of the 2EZ3.6D5 impedance specification of 5 Ohms?

A: The 2EZ3.6D5 exhibits lower impedance (5 Ohms) compared to the MZP4729AG (10 Ohms). Lower impedance results in improved voltage regulation characteristics and reduced voltage variation under load changes. This represents an enhancement over the original specification.

Q: Does the operating temperature range of 2EZ3.6D5 (-65°C to 150°C) limit its application?

A: The 2EZ3.6D5 operating temperature range of -65°C to 150°C is narrower than the MZP4729AG range of -65°C to 200°C. This substitute is suitable for applications where the maximum operating temperature does not exceed 150°C. Applications requiring operation above 150°C require selection of alternatives with extended temperature ratings.

Q: What compliance certifications are relevant for substitute selection?

A: The MZP4729ARL carries RoHS3 compliance certification, indicating conformance to Restriction of Hazardous Substances regulations. The 2EZ3.6D5 is RoHS non-compliant. Selection between these alternatives depends on compliance requirements of the end application and regulatory jurisdiction.

Q: How do reverse leakage current specifications affect circuit performance?

A: Reverse leakage current is specified at 1 V reverse bias. The MZP4729AG exhibits 100 µA leakage, while the 2EZ3.6D5 exhibits 80 µA and BZV85-C3V6 variants exhibit 50 µA. Lower leakage current reduces standby power consumption and improves circuit efficiency in applications sensitive to leakage effects.

Q: Are packaging variants (Cut Tape versus Bulk) functionally equivalent?

A: Yes. Packaging variants (Cut Tape, Bulk) represent different supply formats and do not affect electrical performance or functional equivalence. Selection between packaging formats depends on procurement and assembly process requirements.

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