MZP4734ARLG Equivalent & Substitute Parts

Part Overview

The MZP4734ARLG is a Zener diode manufactured by onsemi, rated at 5.6 V nominal voltage with 3 W maximum power dissipation in an axial through-hole package (DO-204AL/DO-41). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement 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)	5.6	V
Tolerance	±5	%
Power - Max	3	W
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
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 MZP4734ARLG is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal with ±5% tolerance
Power rating: Maximum 3 W (lower power ratings are not direct substitutes)
Package type: Through-hole axial configuration (DO-204AL/DO-41)
Operating temperature range: Minimum -65°C to 200°C coverage
Impedance (Max): 5 Ohms or lower
Reverse leakage current: 10 µA @ 2 V or lower

Substitution Categories:

Direct Equivalents (Same Power Rating - 3 W): Parts with identical 3 W power rating maintain full electrical equivalence for the MZP4734ARLG in all circuit applications.

Functional Substitutes (Reduced Power Rating - 1 W): Parts rated at 1 W power dissipation share identical voltage, tolerance, impedance, and temperature specifications but are limited to applications with lower power requirements. These substitutes are electrically compatible but thermally derated.

Similar Parts (Variant Specifications): Parts with matching voltage and tolerance but differing in secondary parameters (reverse leakage current, forward voltage, or operating temperature range) are classified as similar alternatives with specific application constraints.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status
MZP4734ARLG	onsemi	5.6 V	±5%	3 W	5 Ω	10 µA @ 2 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL/DO-41 Axial	Obsolete
1N5919BRLG	onsemi	5.6 V	±5%	3 W	2 Ω	5 µA @ 3 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL/DO-41 Axial	Active
1N4734A	Microsemi Corporation	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	N/A	-65 to 200°C	DO-204AL/DO-41	Active
1N4734A-T50A	onsemi	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	N/A	-65 to 200°C	DO-204AL/DO-41	Active
1N4734A-T50R	onsemi	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	N/A	-65 to 200°C	DO-204AL/DO-41	Obsolete
1N4734ATR	onsemi	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	N/A	-65 to 200°C	DO-204AL/DO-41	Active
1N4734A,113	NXP Semiconductors	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL/DO-41	Active
1N4734A,133	Nexperia USA Inc.	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL/DO-41	Active
1N3827A-1	Microchip Technology	5.6 V	±5%	1 W	5 Ω	3 µA @ 2 V	1.2 V @ 200 mA	-65 to 175°C	DO-204AL/DO-41	Active
1N4734AGE3	Microchip Technology	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 175°C	DO-204AL/DO-41	Active
1N4734AP/TR12	Microchip Technology	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL/DO-41	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The 1N5919BRLG (onsemi) is the direct equivalent replacement for the MZP4734ARLG. Both parts share identical 3 W power rating, 5.6 V nominal voltage, ±5% tolerance, and -65°C to 200°C operating temperature range. The 1N5919BRLG is currently in active production status with 12,200 units in stock, ensuring long-term availability. This part features improved impedance characteristics (2 Ω maximum versus 5 Ω) and lower reverse leakage current (5 µA @ 3 V versus 10 µA @ 2 V), providing superior performance in voltage regulation applications. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

Secondary Recommendation - Functional Substitute:

The 1N4734A-T50A (onsemi) serves as a functional substitute for applications where power dissipation does not exceed 1 W. This part maintains identical voltage specifications, tolerance, impedance, and temperature range as the original component. Active production status with 16,767 units in stock ensures availability. RoHS3 compliance and cut-tape packaging provide modern manufacturing compatibility.

Alternative Substitutes:

The 1N4734ATR (onsemi) and 1N4734A,113 (NXP Semiconductors) are functionally equivalent 1 W alternatives with active product status. The 1N4734A,113 offers the advantage of higher inventory availability (136,034 units) and NXP manufacturing support.

Constrained Alternatives:

The 1N4734AP/TR12 (Microchip Technology) and 1N4734AGE3 (Microchip Technology) are suitable substitutes with the constraint that operating temperature range is limited to -65°C to 150°C or -65°C to 175°C respectively, making them unsuitable for applications requiring the full 200°C upper temperature specification of the original part.

The 1N3827A-1 (Microchip Technology) features lower reverse leakage current (3 µA @ 2 V) and reduced operating temperature range (-65°C to 175°C), limiting its use to applications not requiring the full thermal specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 W rated Zener diode as a direct replacement for the 3 W MZP4734ARLG?

A: A 1 W rated Zener diode is a functional substitute only for applications where power dissipation does not exceed 1 W. The 1N4734A series (1 W) shares identical voltage, tolerance, impedance, and temperature specifications with the MZP4734ARLG but cannot handle the full 3 W power rating. Circuit analysis must confirm that actual power dissipation remains below 1 W before substitution.

Q: What is the difference between the 1N5919BRLG and 1N4734A-T50A?

A: The primary difference is power rating. The 1N5919BRLG is rated at 3 W maximum power dissipation and is a direct equivalent to the MZP4734ARLG. The 1N4734A-T50A is rated at 1 W and is suitable only for lower-power applications. Both share the same 5.6 V nominal voltage, ±5% tolerance, and -65°C to 200°C operating temperature range. The 1N5919BRLG also features superior impedance (2 Ω versus 5 Ω) and lower reverse leakage current.

Q: Are there RoHS compliance differences between substitute options?

A: Yes. The 1N5919BRLG and 1N4734A-T50A are RoHS3 compliant. The 1N4734A (Microsemi) is RoHS non-compliant. The NXP and Nexperia variants (1N4734A,113 and 1N4734A,133) are RoHS3 compliant. Microchip variants show varying compliance status. Verify RoHS requirements for your application before final part selection.

Q: Can I substitute parts with different operating temperature ranges?

A: Operating temperature range substitution is application-dependent. The MZP4734ARLG operates from -65°C to 200°C. Substitutes with reduced upper temperature limits (such as 1N4734AP/TR12 at -65°C to 150°C) are unsuitable for applications requiring operation at temperatures above 150°C. Verify your circuit's maximum operating temperature before selecting a substitute with a narrower temperature range.

Q: What does the packaging designation "Cut Tape (CT)" versus "Bulk" mean for substitution?

A: Packaging designation refers to the form in which the component is supplied, not the physical package type. "Cut Tape (CT)" indicates components supplied on cut tape suitable for automated pick-and-place equipment. "Bulk" indicates loose components. Both forms contain the same physical DO-41 axial package. Selection depends on your assembly process requirements, not electrical compatibility.

Q: Why does the 1N5919BRLG have lower impedance (2 Ω) than the MZP4734ARLG (5 Ω)?

A: Impedance (Zzt) is a dynamic characteristic that affects voltage regulation performance. Lower impedance indicates better voltage stability under load changes. The 1N5919BRLG's 2 Ω impedance provides superior regulation compared to the 5 Ω specification of the MZP4734ARLG, making it a performance-enhanced equivalent rather than a compromise substitute.

Q: Is the MZP4734ARLG truly obsolete, and how long will substitutes remain available?

A: The MZP4734ARLG is classified as obsolete by onsemi. The recommended substitute, 1N5919BRLG, is in active production status with substantial inventory (12,200 units). Alternative 1 W substitutes such as 1N4734A-T50A and 1N4734ATR are also in active production. Active status indicates ongoing manufacturing support and long-term availability.

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