MZP4749ATAG Equivalent & Substitute Parts

Part Overview

The MZP4749ATAG is a Zener diode manufactured by onsemi, rated for 24 V nominal Zener voltage with 1 W maximum power dissipation in an axial through-hole package. 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)	24	V
Tolerance	±5%	-
Power - Max	1	W
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 18.2 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 MZP4749ATAG is determined by the following critical parameters: nominal Zener voltage (24 V), voltage tolerance (±5%), maximum power rating (1 W or higher), impedance characteristics, reverse leakage current, operating temperature range, and through-hole axial mounting configuration. Parts are grouped into three categories based on substitution relationship:

Similar Manufacturer Parts share the same electrical specifications but may differ in packaging format, manufacturer, or product status. These parts maintain electrical equivalence while offering alternative sourcing options.

Parametric Equivalent Parts meet or exceed the electrical requirements of the main part, including voltage, tolerance, power rating, and temperature range. These parts are direct functional replacements with identical or superior performance characteristics.

Direct Manufacturer Parts are alternative part numbers from different manufacturers that provide identical electrical and mechanical specifications, enabling cross-manufacturer substitution.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Temp Range	Package	Status
MZP4749ATAG	onsemi	24 V	±5%	1 W	25 Ω	-65 to 200°C	Axial	Obsolete
1N4749A-T50R	onsemi	24 V	±5%	1 W	25 Ω	-65 to 200°C	DO-41	Obsolete
1N4749ATR	Fairchild Semiconductor	24 V	±5%	1 W	25 Ω	-65 to 200°C	DO-204AL (DO-41)	Active
1N5934BG	Microsemi Corporation	24 V	±5%	1.25 W	19 Ω	-65 to 175°C	DO-204AL (DO-41)	Active
1N5934BRLG	onsemi	24 V	±5%	3 W	19 Ω	-65 to 200°C	Axial	Active
1N4749A	Lumimax Optoelectronic Technology	24 V	±5%	1 W	25 Ω	-65 to 200°C	DO-41G	Active
1N4749A-T50A	onsemi	24 V	±5%	1 W	25 Ω	-65 to 200°C	DO-41	Active
1N4749A,113	Nexperia USA Inc.	24 V	±5%	1 W	25 Ω	-65 to 200°C	DO-41	Active
1N4474	Microchip Technology	24 V	±5%	1.5 W	16 Ω	-65 to 175°C	DO-41	Active
1N4474C	Microchip Technology	24 V	±2%	1.5 W	16 Ω	-65 to 175°C	DO-41	Active
1N4709	Microchip Technology	24 V	±5%	500 mW	-	-65 to 175°C	DO-35 (DO-204AH)	Active

Engineering Selection Recommendations

For Direct Replacement (Active Status):

The 1N4749A-T50A (onsemi) and 1N4749A,113 (Nexperia USA Inc.) are recommended as primary substitutes. Both parts maintain identical electrical specifications to the MZP4749ATAG with 24 V nominal voltage, ±5% tolerance, 1 W power rating, and 25 Ω maximum impedance. Both are in active product status with RoHS3 compliance, ensuring long-term availability and regulatory conformance.

For Enhanced Performance (Active Status):

The 1N5934BRLG (onsemi) provides superior performance with 3 W power rating while maintaining the same 24 V nominal voltage and ±5% tolerance. This part operates across the full -65°C to 200°C temperature range and is RoHS3 compliant. The increased power rating accommodates higher dissipation requirements without changing circuit topology.

The 1N4474 and 1N4474C (Microchip Technology) offer 1.5 W power ratings with improved impedance characteristics (16 Ω versus 25 Ω). The 1N4474C provides tighter voltage tolerance at ±2%, suitable for applications requiring enhanced voltage regulation precision.

For Compact Applications:

The 1N4709 (Microchip Technology) is suitable for space-constrained designs, featuring a smaller DO-35 package while maintaining 24 V nominal voltage and ±5% tolerance. The 500 mW power rating limits this part to lower-power applications.

For Cross-Manufacturer Sourcing:

The 1N4749ATR (Fairchild Semiconductor) provides equivalent specifications with active product status, enabling procurement flexibility across multiple suppliers.

Frequently Asked Questions (FAQ)

Q: Can the 1N4749A-T50A directly replace the MZP4749ATAG?

A: Yes. Both parts share identical electrical specifications: 24 V nominal Zener voltage, ±5% tolerance, 1 W maximum power, 25 Ω maximum impedance, and -65°C to 200°C operating temperature range. The primary difference is packaging format (DO-41 versus axial), which does not affect electrical performance in through-hole applications.

Q: What is the difference between the 1N4749A and 1N4749A-T50A?

A: Both parts are electrically identical with 24 V nominal voltage, ±5% tolerance, and 1 W power rating. The designation suffix indicates packaging and tape format. The 1N4749A-T50A is supplied in cut tape format, while 1N4749A may reference different packaging configurations. Electrical performance is equivalent.

Q: Is the 1N5934BRLG a suitable substitute despite its 3 W rating?

A: Yes. The 1N5934BRLG maintains the same 24 V nominal voltage and ±5% tolerance as the MZP4749ATAG. The higher 3 W power rating is a performance enhancement that does not compromise compatibility. This part is suitable for applications requiring higher power dissipation capacity.

Q: Why is the 1N4709 listed as a substitute if it has lower power rating?

A: The 1N4709 is a parametric equivalent for applications where the 500 mW power rating is sufficient. It maintains the 24 V nominal voltage and ±5% tolerance. This part is appropriate only for low-power circuits and is not suitable for applications requiring the full 1 W capability of the MZP4749ATAG.

Q: What is the significance of the ±2% tolerance on the 1N4474C?

A: The 1N4474C provides tighter voltage tolerance (±2% versus ±5%) compared to the MZP4749ATAG. This enhanced precision is beneficial for voltage regulation applications requiring stricter voltage control. The part is otherwise electrically compatible with identical 24 V nominal voltage and 1.5 W power rating.

Q: Can I use the 1N4474 or 1N4474C in place of the MZP4749ATAG?

A: Yes. Both parts maintain 24 V nominal voltage and ±5% tolerance (1N4474) or ±2% tolerance (1N4474C). The 1.5 W power rating exceeds the 1 W requirement, and the 16 Ω impedance is lower than the 25 Ω specification, providing improved performance characteristics. Operating temperature range is -65°C to 175°C, which covers the primary operating window of the MZP4749ATAG.

Q: What packaging considerations apply when substituting the MZP4749ATAG?

A: The MZP4749ATAG uses an axial through-hole package. Most substitutes use DO-41 or DO-204AL packages, which are mechanically compatible in standard through-hole PCB layouts. The 1N4709 uses a smaller DO-35 package, which may require PCB layout modifications. Verify PCB footprint compatibility before component selection.

Q: Are there RoHS compliance differences among the substitute parts?

A: Yes. The 1N4749A-T50A, 1N4749A-T50A, and 1N4749A,113 are RoHS3 compliant. The 1N5934BRLG is RoHS3 compliant. The 1N4474 and 1N4474C are RoHS non-compliant. The 1N5934BG is RoHS non-compliant. Verify RoHS requirements for your application before selection.

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