MZP4749ARLG Equivalent & Substitute Parts

Part Overview

The MZP4749ARLG is a 24 V, 1 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole packaging. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Equivalent and substitute parts are necessary to maintain design continuity and ensure uninterrupted supply for applications requiring 24 V Zener regulation in through-hole configurations.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	24 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	25 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 18.2 V
Voltage - Forward (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

Substitute Part Grouping Explanation

Substitution of the MZP4749ARLG is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 24 V (nominal)
Zener voltage tolerance: ±5%
Power dissipation: 1 W (minimum)
Mounting type: Through Hole
Package type: DO-204AL / DO-41 Axial

Secondary Compatibility Parameters:

Impedance (Zzt): 25 Ohms (maximum)
Reverse leakage current: 5 µA @ 18.2 V (maximum)
Forward voltage: 1.5 V @ 200 mA (maximum)
Operating temperature range: -65°C ~ 200°C (minimum)

Substitute parts are grouped into three categories:

Direct Parametric Equivalents: Parts matching all primary and secondary parameters with identical electrical performance.
Similar Parts with Enhanced Specifications: Parts exceeding minimum power or impedance requirements while maintaining core voltage and tolerance specifications.
Compatible Alternatives: Parts meeting primary substitution criteria with minor variations in secondary parameters within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
MZP4749ARLG	onsemi	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.5 V @ 200 mA	-65°C ~ 200°C	DO-41 Axial	Obsolete
1N4749A	Lumimax Optoelectronic Technology	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41G Axial	Active
1N5934BG	Microsemi Corporation	24 V	±5%	1.25 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 175°C	DO-204AL Axial	Active
1N4749A-T50A	onsemi	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	Not Specified	-65°C ~ 200°C	DO-41 Axial	Active
1N4749A-T50R	onsemi	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	Not Specified	-65°C ~ 200°C	DO-41 Axial	Obsolete
1N4749ATR	Fairchild Semiconductor	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	Not Specified	-65°C ~ 200°C	DO-204AL Axial	Active
1N4474	Microchip Technology	24 V	±5%	1.5 W	16 Ω	50 nA @ 19.2 V	1.5 V @ 1 A	-65°C ~ 175°C	DO-41 Axial	Active
1N4749AP/TR8	Microchip Technology	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-204AL Axial	Active
1N5934B	Microchip Technology	24 V	±5%	1.25 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 175°C	DO-41 Axial	Active
1N5934P/TR12	Microchip Technology	24 V	±20%	1.5 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-204AL Axial	Active
1N5934P/TR8	Microchip Technology	24 V	±20%	1.5 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65°C ~ 150°C	DO-204AL Axial	Active

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Recommended Primary Substitutes):

1N4749A (Lumimax Optoelectronic Technology) - Active status. Matches all primary electrical parameters with identical 24 V nominal voltage, ±5% tolerance, 1 W power rating, and 25 Ω impedance. Forward voltage specification (1.2 V @ 200 mA) is superior to the original part. Operating temperature range (-65°C ~ 200°C) matches the original specification. High inventory availability (37,200 pcs) ensures supply continuity.
1N4749A-T50A (onsemi) - Active status. Manufactured by the original equipment supplier. Identical electrical specifications to MZP4749ARLG with 24 V, ±5%, 1 W, and 25 Ω impedance. RoHS3 compliant. Operating temperature range (-65°C ~ 200°C) matches original. Adequate inventory (6,419 pcs).
1N4749ATR (Fairchild Semiconductor) - Active status. Meets all primary substitution criteria with 24 V, ±5%, 1 W, and 25 Ω impedance. Operating temperature range (-65°C ~ 200°C) matches original. Highest inventory availability (24,885 pcs) among equivalent parts.

Tier 2 - Enhanced Specification Alternatives (Secondary Substitutes):

1N5934B (Microchip Technology) - Active status. Exceeds power rating (1.25 W vs. 1 W) while maintaining 24 V, ±5% tolerance. Impedance reduced to 19 Ω (improved regulation). Reverse leakage current reduced to 1 µA (improved performance). Operating temperature range (-65°C ~ 175°C) is slightly reduced. High inventory (22,632 pcs).
1N5934BG (Microsemi Corporation) - Active status. Similar enhanced specifications to 1N5934B with 1.25 W power rating and 19 Ω impedance. Reverse leakage current 1 µA. Operating temperature range (-65°C ~ 175°C). Adequate inventory (1,059 pcs).
1N4474 (Microchip Technology) - Active status. Highest power rating (1.5 W) with lowest impedance (16 Ω) among alternatives. Maintains 24 V, ±5% specifications. Reverse leakage current significantly reduced (50 nA). Operating temperature range (-65°C ~ 175°C). Suitable for applications requiring enhanced thermal margin.

Tier 3 - Conditional Alternatives (Limited Substitution):

1N4749AP/TR8 (Microchip Technology) - Active status. Meets primary electrical specifications (24 V, ±5%, 1 W, 25 Ω). Operating temperature range reduced to -65°C ~ 150°C. Suitable only for applications not requiring full -65°C ~ 200°C range.
1N5934P/TR12 and 1N5934P/TR8 (Microchip Technology) - Active status. Voltage tolerance increased to ±20% (not suitable for precision regulation applications). Power rating 1.5 W and impedance 19 Ω provide enhanced performance. Operating temperature range -65°C ~ 150°C. Use only when tolerance relaxation is acceptable.

Parts to Avoid:

1N4749A-T50R (onsemi) - Obsolete status. Not recommended despite matching electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MZP4749ARLG with 1N4749A?

A: Yes. The 1N4749A meets all primary substitution criteria with identical 24 V nominal voltage, ±5% tolerance, 1 W power rating, and 25 Ω impedance. The part is in active production status with high inventory availability. Forward voltage performance (1.2 V @ 200 mA) is superior to the original specification.

Q: What is the difference between 1N4749A and 1N5934B?

A: Both parts maintain the 24 V nominal voltage and ±5% tolerance required for substitution. The 1N5934B provides enhanced specifications: 1.25 W power rating (vs. 1 W), 19 Ω impedance (vs. 25 Ω), and 1 µA reverse leakage (vs. 5 µA). The 1N5934B is suitable for applications requiring improved thermal performance or lower leakage current. Operating temperature range is reduced to -65°C ~ 175°C.

Q: Are there RoHS-compliant alternatives?

A: Yes. The 1N4749A-T50A (onsemi) is RoHS3 compliant and provides identical electrical specifications to the original MZP4749ARLG. This part is recommended for applications requiring RoHS compliance.

Q: Can I use 1N5934P/TR12 or 1N5934P/TR8 as substitutes?

A: These parts are not recommended as direct substitutes. While they maintain the 24 V nominal voltage and through-hole axial package, the voltage tolerance is increased to ±20% (compared to ±5% for the original part). These parts are suitable only for applications where voltage tolerance relaxation is acceptable. Operating temperature range is also reduced to -65°C ~ 150°C.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects voltage regulation quality. The original MZP4749ARLG specifies 25 Ω maximum impedance. Substitute parts with lower impedance (such as 1N5934B at 19 Ω or 1N4474 at 16 Ω) provide superior voltage regulation and lower dynamic resistance. Parts with identical impedance (25 Ω) provide equivalent regulation performance.

Q: Does operating temperature range affect substitution?

A: Yes, for applications requiring the full -65°C ~ 200°C range. The original MZP4749ARLG supports this full range. Alternatives such as 1N5934B, 1N4474, and 1N5934P series are limited to -65°C ~ 175°C or -65°C ~ 150°C. Verify application temperature requirements before selecting a substitute with a reduced range.

Q: What packaging options are available?

A: All substitute parts are available in DO-204AL (DO-41) axial through-hole packaging, matching the original MZP4749ARLG. Packaging variations include bulk, cut tape (CT), and tape & reel (TR) formats. Select the packaging format that matches your procurement and assembly requirements.

Q: Which substitute offers the best long-term availability?

A: The 1N4749A (Lumimax Optoelectronic Technology) and 1N4749ATR (Fairchild Semiconductor) are recommended for long-term availability. Both are in active production status with high inventory levels (37,200 pcs and 24,885 pcs respectively). The 1N4749A-T50A (onsemi) is also actively produced by the original manufacturer.

Q: Can I use 1N4474 in place of MZP4749ARLG?

A: Yes, with consideration of enhanced specifications. The 1N4474 maintains the 24 V nominal voltage and ±5% tolerance. It provides superior performance with 1.5 W power rating (vs. 1 W), 16 Ω impedance (vs. 25 Ω), and significantly reduced reverse leakage (50 nA vs. 5 µA). Operating temperature range is reduced to -65°C ~ 175°C. This part is suitable for applications where enhanced thermal margin and improved regulation are beneficial.

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