MZP4744ARLG Equivalent & Substitute Parts

Part Overview

The MZP4744ARLG is a Zener diode rated at 15 V nominal voltage with 3 W maximum power dissipation in an axial through-hole package. Manufactured by onsemi, this component is classified as obsolete, which necessitates 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	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	%
Power - Max	3	W
Impedance (Max)	14	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 11.4 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitution of the MZP4744ARLG is determined by the following critical parameters: nominal Zener voltage (15 V), voltage tolerance (±5%), maximum power rating (3 W or higher), package type (axial through-hole), and operating temperature range compatibility (-65°C to 200°C or higher). Parts are grouped into three categories based on power rating alignment:

Direct Equivalent (3 W Power Rating): Parts with identical 3 W power dissipation maintain full functional equivalence with the MZP4744ARLG.

Higher Power Rating (5 W): Parts rated at 5 W power dissipation provide enhanced thermal capability and are electrically compatible for applications where the original 3 W rating is sufficient but higher power margin is desired.

Lower Power Rating (1 W to 1.5 W): Parts with reduced power ratings (1 W or 1.5 W) are suitable only for applications where the circuit design does not require the full 3 W dissipation capability of the original part.

All substitute parts maintain the 15 V nominal Zener voltage, ±5% tolerance, through-hole axial mounting, and compatible operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vr Leakage	Vf (Max)	Temp Range	Package	Status
MZP4744ARLG	onsemi	15 V	±5%	3 W	14 Ω	5 µA @ 11.4 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41, Axial	Obsolete
1N5929BRLG	onsemi	15 V	±5%	3 W	9 Ω	1 µA @ 11.4 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41, Axial	Active
1N5352BRLG	onsemi	15 V	±5%	5 W	2.5 Ω	1 µA @ 11.5 V	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Active
1N4744ATR	onsemi	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	Not specified	-65 to 200°C	DO-204AL, DO-41	Active
1N4744A	Microchip Technology	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	1.2 V @ 200 mA	-65 to 175°C	DO-204AL, DO-41	Discontinued
1N4744A,113	Nexperia USA Inc.	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4744A,133	NXP Semiconductors	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4744AE3/TR13	Microchip Technology	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N4744AP/TR8	Microchip Technology	15 V	±5%	1 W	14 Ω	5 µA @ 11.4 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N4469	Microchip Technology	15 V	±5%	1.5 W	9 Ω	50 nA @ 12 V	1.5 V @ 1 A	-65 to 175°C	DO-204AL, DO-41	Active
1N5245	Microchip Technology	15 V	±5%	500 mW	16 Ω	100 nA @ 10.5 V	1.5 V @ 200 mA	-65 to 175°C	DO-204AH, DO-35	Active

Engineering Selection Recommendations

Primary Substitute - Direct Equivalent: The 1N5929BRLG (onsemi) is the recommended direct substitute for the MZP4744ARLG. Both parts share identical 15 V nominal voltage, ±5% tolerance, 3 W maximum power rating, and -65°C to 200°C operating temperature range. The 1N5929BRLG is currently in active production status with 18,939 units in stock, ensuring supply continuity. The part exhibits improved electrical characteristics with lower impedance (9 Ω versus 14 Ω) and reduced reverse leakage current (1 µA versus 5 µA), providing enhanced performance. RoHS3 compliance status supports modern manufacturing requirements.

Higher Power Alternative: The 1N5352BRLG (onsemi) provides a 5 W power rating with identical 15 V voltage specification and -65°C to 200°C temperature range. This part is suitable for applications where thermal margin enhancement is required. The package designation changes to T-18 axial format. Lower impedance (2.5 Ω) and reduced leakage current (1 µA) offer superior electrical performance. Active production status with 40,200 units in stock ensures availability.

Lower Power Alternatives: Parts rated at 1 W (1N4744ATR, 1N4744A variants, 1N4744AE3/TR13, 1N4744AP/TR8) and 1.5 W (1N4469) are suitable only for circuit designs where power dissipation does not exceed these ratings. The 1N4744ATR (onsemi) maintains the full -65°C to 200°C temperature range and active production status. Nexperia USA Inc. and NXP Semiconductors variants (1N4744A,113 and 1N4744A,133) provide active alternatives with RoHS3 compliance. Microchip Technology variants show reduced maximum operating temperature (-65°C to 150°C or 175°C), which may limit suitability for high-temperature applications.

Compliance Considerations: The 1N5929BRLG and 1N5352BRLG carry RoHS3 compliance certification, supporting current regulatory requirements. The 1N4744A (Microchip) is marked as discontinued at DiGi Electronics and exhibits RoHS non-compliance, limiting its use in new designs. The 1N5245 (500 mW rating) is not recommended as a substitute due to insufficient power rating for the original 3 W specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5929BRLG directly replace the MZP4744ARLG without circuit modification?

A: Yes. The 1N5929BRLG maintains identical electrical specifications for Zener voltage (15 V), tolerance (±5%), power rating (3 W), and operating temperature range (-65°C to 200°C). Both parts use axial through-hole packaging compatible with DO-204AL and DO-41 footprints. No circuit modification is required.

Q: What is the difference between the 1N5929BRLG and 1N5352BRLG?

A: The primary difference is power rating: 1N5929BRLG is rated at 3 W, while 1N5352BRLG is rated at 5 W. Both maintain 15 V nominal voltage and -65°C to 200°C operating range. The 1N5352BRLG uses a T-18 axial package format. The 1N5352BRLG is suitable for applications requiring higher thermal dissipation capability.

Q: Can 1 W rated parts (1N4744 series) substitute for the 3 W MZP4744ARLG?

A: 1 W rated parts are suitable only if the circuit design does not require the full 3 W power dissipation capability. If the application demands 3 W dissipation, 1 W parts will experience thermal stress and reduced reliability. Verify circuit power requirements before selecting lower-rated alternatives.

Q: What is the significance of the impedance (Zzt) parameter in substitution?

A: Impedance affects voltage regulation quality and transient response. The MZP4744ARLG has 14 Ω impedance. The 1N5929BRLG (9 Ω) and 1N5352BRLG (2.5 Ω) provide lower impedance, resulting in improved voltage regulation and faster transient response. Lower impedance is generally beneficial for voltage regulation applications.

Q: Are there temperature range limitations with substitute parts?

A: Yes. The MZP4744ARLG operates to 200°C maximum. The 1N5929BRLG and 1N5352BRLG maintain this full range. However, 1N4744 variants from Microchip (1N4744AE3/TR13 and 1N4744AP/TR8) are limited to -65°C to 150°C, and other 1N4744A variants operate to -65°C to 175°C. Verify application temperature requirements before selection.

Q: What packaging considerations apply to the 1N5352BRLG?

A: The 1N5352BRLG uses T-18 axial package format, which differs from the DO-204AL/DO-41 format of the MZP4744ARLG. T-18 is a larger package suitable for higher power dissipation. Verify PCB footprint compatibility before substitution.

Q: Why is the 1N4744A (Microchip) marked as discontinued?

A: The 1N4744A from Microchip Technology is discontinued at DiGi Electronics and exhibits RoHS non-compliance status. For new designs, active alternatives such as 1N4744A,113 (Nexperia) or 1N4744ATR (onsemi) are recommended to ensure long-term supply and regulatory compliance.

Q: What does RoHS3 compliance indicate?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting use of lead, cadmium, mercury, and other hazardous materials. Parts with RoHS3 compliance (1N5929BRLG, 1N5352BRLG, 1N4744A variants from Nexperia and NXP) are suitable for modern manufacturing and export to regulated markets.

Q: Is the 1N5245 (500 mW) suitable as a substitute?

A: No. The 1N5245 is rated at 500 mW maximum power, which is insufficient for applications requiring the 3 W capability of the MZP4744ARLG. The 1N5245 uses DO-35 (DO-204AH) package format, incompatible with the original axial footprint. This part is not recommended as a substitute.

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