MZP4749ATA Equivalent & Substitute Parts

Part Overview

The MZP4749ATA is a 24 V, 3 W Zener diode manufactured by onsemi in axial through-hole packaging (DO-204AL/DO-41). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MZP4749ATA operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is RoHS non-compliant. Substitute parts must maintain the 24 V nominal Zener voltage and ±5% tolerance while accommodating variations in power dissipation and electrical characteristics based on application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±5%	—
Power - Max	3	W
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 18.2 V
Voltage - Forward (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 MZP4749ATA is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 24 V (exact match required)
Tolerance: ±5% (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: DO-204AL, DO-41, or Axial (compatible families)

Secondary Compatibility Factors:

Power - Max: 3 W (primary part rating; substitutes with equal or greater power rating are acceptable)
Impedance (Max): 25 Ohms (electrical performance parameter)
Current - Reverse Leakage @ Vr: 5 µA @ 18.2 V (leakage specification)
Operating Temperature: -65°C to 200°C (thermal operating range)

Substitute parts are grouped into two categories:

Category 1 - Direct Power Rating Match (3 W): The 1N5934BRNG (onsemi) maintains the 3 W power dissipation specification, identical impedance characteristics, and active product status. This part provides the closest electrical equivalence to the obsolete MZP4749ATA.

Category 2 - Reduced Power Rating (1 W to 1.5 W): Parts including 1N4749A variants (Lumimax, Nexperia, NXP, Microchip) and 1N4474 (Microchip) operate at 1 W or 1.5 W power ratings. These substitutes are suitable for applications where the full 3 W dissipation capability is not required. The 1N4749A series maintains the 24 V nominal voltage, ±5% tolerance, and through-hole axial packaging. The 1N4474 provides 1.5 W capability with improved impedance characteristics (16 Ohms) but operates to 175°C maximum.

All substitute parts maintain the 24 V Zener voltage specification and ±5% tolerance required for direct functional replacement.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Product Status	RoHS Status
MZP4749ATA	onsemi	24 V	±5%	3 W	25 Ω	5 µA @ 18.2 V	1.5 V @ 200 mA	-65 to 200°C	Obsolete	Non-compliant
1N5934BRNG	onsemi	24 V	±5%	3 W	19 Ω	1 µA @ 18.2 V	1.5 V @ 200 mA	-65 to 200°C	Active	ROHS3 Compliant
1N4749A	Lumimax Optoelectronic Technology	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 200°C	Active	RoHS Compliant
1N4749ATR	Fairchild Semiconductor	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	—	-65 to 200°C	Active	—
1N4749A,113	Nexperia USA Inc.	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 200°C	Active	ROHS3 Compliant
1N4749A,133	NXP Semiconductors	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 200°C	Active	—
1N4749AP/TR8	Microchip Technology	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	Active	Non-compliant
1N4474	Microchip Technology	24 V	±5%	1.5 W	16 Ω	50 nA @ 19.2 V	1.5 V @ 1 A	-65 to 175°C	Active	Non-compliant
1N5934P/TR12	Microchip Technology	24 V	±20%	1.5 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	Active	Non-compliant
1N5934P/TR8	Microchip Technology	24 V	±20%	1.5 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	Active	Non-compliant
1N5934PE3/TR12	Microchip Technology	24 V	±20%	1.5 W	19 Ω	1 µA @ 18.2 V	1.2 V @ 200 mA	-65 to 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The 1N5934BRNG (onsemi) is the primary substitute for the MZP4749ATA. This part maintains identical electrical specifications: 24 V nominal Zener voltage, ±5% tolerance, 3 W power dissipation, and -65°C to 200°C operating temperature range. The 1N5934BRNG is manufactured by the same supplier (onsemi), carries active product status, and is ROHS3 compliant. The impedance specification (19 Ohms) is superior to the original part (25 Ohms), and reverse leakage current is reduced (1 µA versus 5 µA), indicating improved electrical performance.

Secondary Recommendations - Reduced Power Rating:

For applications where 3 W dissipation is not required, the following 1 W rated parts provide functional substitution with 24 V nominal voltage and ±5% tolerance:

1N4749A,113 (Nexperia USA Inc.) - Active status, ROHS3 compliant, -65°C to 200°C operating range
1N4749A,133 (NXP Semiconductors) - Active status, -65°C to 200°C operating range
1N4749A (Lumimax Optoelectronic Technology) - Active status, RoHS compliant, -65°C to 200°C operating range

These parts maintain 25 Ohms impedance and 5 µA reverse leakage specifications identical to the MZP4749ATA.

Intermediate Power Rating Option:

The 1N4474 (Microchip Technology) provides 1.5 W dissipation with improved impedance (16 Ohms) and significantly lower reverse leakage (50 nA). However, the maximum operating temperature is limited to 175°C, which is 25°C below the MZP4749ATA specification.

Tolerance Consideration:

Parts designated 1N5934P/TR12, 1N5934P/TR8, and 1N5934PE3/TR12 carry ±20% voltage tolerance, which deviates from the ±5% specification of the MZP4749ATA. These parts are not recommended for applications requiring ±5% tolerance accuracy.

Temperature Range Consideration:

The 1N4749AP/TR8 (Microchip Technology) operates to 150°C maximum, which is 50°C below the MZP4749ATA specification. Selection of this part requires verification that the application does not exceed 150°C junction temperature.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 W rated Zener diode as a direct replacement for the 3 W MZP4749ATA?

A: A 1 W rated part can be used only if the application circuit does not require the full 3 W dissipation capability. The 1N4749A series maintains the 24 V nominal voltage and ±5% tolerance, making it functionally compatible for lower-power applications. Verify that the actual power dissipation in your circuit does not exceed 1 W before substitution.

Q: What is the difference between the 1N4749A variants from different manufacturers?

A: The 1N4749A,113 (Nexperia), 1N4749A,133 (NXP), and 1N4749A (Lumimax) are electrically equivalent 24 V, 1 W Zener diodes with identical specifications: ±5% tolerance, 25 Ohms impedance, 5 µA reverse leakage, and -65°C to 200°C operating range. The primary differences are manufacturer, packaging format (Cut Tape versus Bulk), and RoHS compliance status. Selection between these variants depends on procurement requirements and compliance certifications needed for your application.

Q: Why is the 1N5934BRNG recommended over the 1N4749A series?

A: The 1N5934BRNG maintains the 3 W power dissipation rating of the original MZP4749ATA, whereas the 1N4749A series is rated at 1 W. If your application requires the full 3 W capability, the 1N5934BRNG is the appropriate choice. Additionally, the 1N5934BRNG offers improved electrical characteristics: lower impedance (19 Ohms versus 25 Ohms) and reduced reverse leakage (1 µA versus 5 µA).

Q: Are all substitute parts available in the same axial through-hole package?

A: Yes, all substitute parts listed are available in DO-204AL (DO-41) axial through-hole packaging, which is mechanically and electrically compatible with the MZP4749ATA. Verify the specific supplier device package designation when ordering to ensure correct packaging format.

Q: What is the significance of the ±20% tolerance on the 1N5934P series?

A: The 1N5934P/TR12, 1N5934P/TR8, and 1N5934PE3/TR12 parts carry ±20% voltage tolerance, compared to the ±5% tolerance of the MZP4749ATA. This wider tolerance range means the actual Zener voltage can deviate up to ±20% from the 24 V nominal specification. These parts are not suitable for applications requiring tight voltage regulation or ±5% accuracy. Use only if your circuit design accommodates the wider tolerance band.

Q: Can I use the 1N4474 if my application operates at temperatures above 175°C?

A: No. The 1N4474 is rated for operation only to 175°C maximum junction temperature, whereas the MZP4749ATA operates to 200°C. If your application requires operation above 175°C, the 1N4474 is not suitable. The 1N5934BRNG or 1N4749A series (both rated to 200°C) are appropriate alternatives.

Q: What is the difference between RoHS compliant and ROHS3 compliant parts?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current version of the RoHS directive. Parts marked as RoHS compliant or ROHS3 compliant meet the same hazardous substance restrictions. Selection between these variants depends on your procurement and regulatory requirements.

Q: Is the MZP4749ATA still available for purchase?

A: The MZP4749ATA is classified as obsolete. While limited inventory may be available from component distributors (765 pieces noted in stock), this part is no longer in active production. For new designs or ongoing procurement, substitution with an active product such as the 1N5934BRNG is recommended to ensure long-term availability and supply chain stability.

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