MZP4750ARL Zener Diode 27V 3W Equivalent & Substitute Parts

Part Overview

The MZP4750ARL is a through-hole axial zener diode manufactured by onsemi, rated for 27 V nominal zener voltage and 3 W maximum power dissipation. This component is classified as obsolete, though 908 pieces remain in current inventory. The part operates across a temperature range of -65°C to 200°C and is RoHS non-compliant. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs, production continuity, and long-term component availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±5%	—
Power - Max	3	W
Impedance (Max)	35	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 20.6 V
Voltage - Forward (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	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MZP4750ARL is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 27 V nominal (±5% tolerance preferred for direct equivalence)
Power rating: Minimum 3 W to maintain equivalent thermal performance
Impedance (Zzt): Maximum 35 Ohms
Reverse leakage current: 5 µA @ 20.6 V or lower
Forward voltage: 1.5 V @ 200 mA or lower
Operating temperature range: Minimum -65°C to 200°C (or -65°C to 150°C for reduced-temperature variants)
Mounting type: Through Hole
Package: DO-204AL, DO-41, or Axial configurations

Substitution Groups:

Group 1: Direct Power-Rated Equivalents (3 W or Higher) Parts with 3 W or greater power ratings maintain full thermal equivalence to the MZP4750ARL. The 1N5361BRLG (5 W) and 1N5361BE3/TR13 (5 W) fall into this category, offering superior power handling and lower impedance (5 Ohms).

Group 2: Reduced Power Substitutes (1 W to 1.5 W) Parts rated at 1 W to 1.5 W (1N4750A, 1N4750ATR, 1N4475, 1N4750AP/TR12, 1N4750AP/TR8, 1N5935B) are suitable for applications where the full 3 W dissipation is not required. These parts maintain the 27 V zener voltage and ±5% tolerance but operate at lower power levels.

Group 3: Voltage-Adjacent Variants (28 V) The 1N5935E3/TR13 operates at 28 V nominal with ±20% tolerance, representing a voltage deviation from the primary specification. This part is suitable only for applications with voltage tolerance flexibility.

All substitute parts maintain through-hole axial or DO-41 packaging and operate within the specified temperature range or a subset thereof.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
MZP4750ARL	onsemi	27 V	±5%	3 W	35 Ω	5 µA @ 20.6 V	1.5 V @ 200 mA	-65 to 200°C	DO-41, Axial	Obsolete
1N4750A	Lumimax Optoelectronic Technology	27 V	±5%	1 W	35 Ω	5 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 200°C	DO-41G, Axial	Active
1N4750ATR	Fairchild Semiconductor	27 V	±5%	1 W	35 Ω	5 µA @ 20.6 V	—	-65 to 200°C	DO-204AL (DO-41)	Active
1N5361BRLG	onsemi	27 V	±5%	5 W	5 Ω	500 nA @ 20.6 V	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Active
1N4475	Microchip Technology	27 V	±5%	1.5 W	18 Ω	50 nA @ 21.6 V	1.5 V @ 1 A	-65 to 175°C	DO-204AL, DO-41	Active
1N4750AP/TR12	Microchip Technology	27 V	±5%	1 W	35 Ω	5 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL (DO-41)	Active
1N4750AP/TR8	Microchip Technology	27 V	±5%	1 W	35 Ω	5 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL (DO-41)	Active
1N5361BE3/TR13	Microchip Technology	27 V	±5%	5 W	5 Ω	500 nA @ 19.4 V	1.2 V @ 1 A	-65 to 150°C	T-18, Axial	Active
1N5361E3/TR13	Microchip Technology	27 V	±20%	5 W	5 Ω	500 nA @ 19.4 V	1.2 V @ 1 A	-65 to 150°C	T-18, Axial	Active
1N5935B	Microchip Technology	27 V	±5%	1.25 W	23 Ω	1 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 175°C	DO-204AL, DO-41	Active
1N5935E3/TR13	Microchip Technology	28 V	±20%	1.5 W	23 Ω	1 µA @ 20.6 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

For Direct Thermal Equivalence (3 W Power Rating):

The 1N5361BRLG and 1N5361BE3/TR13 provide the closest functional equivalence to the MZP4750ARL. Both maintain 27 V nominal zener voltage with ±5% tolerance, deliver 5 W maximum power dissipation (exceeding the 3 W requirement), and operate across the full -65°C to 200°C temperature range (1N5361BRLG) or -65°C to 150°C (1N5361BE3/TR13). The 1N5361BRLG is manufactured by onsemi (same as the original part) and carries ROHS3 compliance. The reduced impedance (5 Ohms versus 35 Ohms) provides superior voltage regulation characteristics.

For Reduced Power Applications (1 W to 1.5 W):

When circuit design permits operation below 3 W dissipation, the 1N4750A, 1N4750ATR, 1N4750AP/TR12, and 1N4750AP/TR8 are suitable alternatives. These parts maintain 27 V ±5% specifications and operate at 1 W power rating. The 1N4750A from Lumimax and 1N4750ATR from Fairchild both support the full -65°C to 200°C temperature range. The Microchip variants (1N4750AP/TR12 and 1N4750AP/TR8) operate to 150°C maximum.

The 1N5935B offers an intermediate power rating of 1.25 W with improved impedance characteristics (23 Ohms) and operates to 175°C, providing a balanced option between the 1 W and 3 W categories.

For Compliance Considerations:

The 1N5361BRLG carries ROHS3 compliance, making it suitable for applications requiring RoHS certification. The original MZP4750ARL is RoHS non-compliant. All substitute parts maintain REACH Unaffected and EAR99 ECCN status consistent with the original part.

For Temperature-Constrained Applications:

If the full -65°C to 200°C operating range is required, select from 1N4750A, 1N4750ATR, or 1N5361BRLG. Parts with -65°C to 150°C or -65°C to 175°C ranges are suitable only for applications not requiring operation above 150°C or 175°C respectively.

Frequently Asked Questions (FAQ)

Q: Can the 1N4750A (1 W) directly replace the MZP4750ARL (3 W) in all applications?

A: The 1N4750A maintains identical zener voltage (27 V ±5%), impedance (35 Ohms), and reverse leakage specifications. However, it is rated for 1 W maximum power dissipation versus 3 W for the MZP4750ARL. Substitution is valid only if circuit analysis confirms that steady-state power dissipation does not exceed 1 W. Transient or peak power events must also remain within the 1 W limit. For applications requiring the full 3 W thermal capability, use 1N5361BRLG or 1N5361BE3/TR13 instead.

Q: What is the difference between 1N5361BRLG and 1N5361BE3/TR13?

A: Both parts are 27 V 5 W zener diodes in T-18 axial package. The primary difference is operating temperature range: 1N5361BRLG operates -65°C to 200°C, while 1N5361BE3/TR13 operates -65°C to 150°C. The 1N5361BRLG is manufactured by onsemi; 1N5361BE3/TR13 is manufactured by Microchip Technology. Select based on maximum operating temperature requirements.

Q: Why does 1N5935E3/TR13 show 28 V instead of 27 V?

A: The 1N5935E3/TR13 is rated for 28 V nominal zener voltage with ±20% tolerance. This represents a voltage specification deviation from the MZP4750ARL (27 V ±5%). This part is not a direct substitute and should be used only in applications where the zener voltage tolerance permits operation at 28 V nominal.

Q: Are all substitute parts available in the same axial package as the MZP4750ARL?

A: The MZP4750ARL uses DO-204AL, DO-41, or Axial packaging. Most substitute parts maintain DO-41 or DO-204AL (DO-41) compatibility. The 1N5361 series (1N5361BRLG, 1N5361BE3/TR13, 1N5361E3/TR13) use T-18 axial package, which is physically larger but maintains through-hole axial mounting. Verify PCB layout compatibility before selection.

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

A: Impedance (Zzt) affects voltage regulation quality under load changes. The MZP4750ARL specifies 35 Ohms maximum impedance. The 1N5361 series offers superior regulation with 5 Ohms impedance, while 1N4475 provides 18 Ohms. Lower impedance results in better voltage stability. Higher impedance (within specification limits) is acceptable for applications with less stringent regulation requirements.

Q: Can I use 1N4750AP/TR12 or 1N4750AP/TR8 if my circuit operates above 150°C?

A: No. Both parts are rated for maximum operating temperature of 150°C (TJ). If your application requires operation above 150°C, select alternatives with higher temperature ratings: 1N4750A (200°C), 1N4750ATR (200°C), 1N5361BRLG (200°C), 1N5935B (175°C), or 1N4475 (175°C).

Q: What does "Tape & Reel (TR)" packaging mean for 1N4750AP/TR12 and 1N4750AP/TR8?

A: Tape & Reel packaging indicates the parts are supplied on continuous carrier tape wound on reels, suitable for automated assembly equipment. The "TR12" and "TR8" designations refer to reel quantities (12 and 8 units per reel respectively). For manual assembly or small-quantity applications, select parts with Bulk or standard packaging. Electrical specifications remain identical regardless of packaging format.

Q: Is RoHS compliance a critical factor for selecting a substitute?

A: RoHS compliance depends on application requirements. The original MZP4750ARL is RoHS non-compliant. If your design requires RoHS certification, select 1N5361BRLG or 1N5361BE3/TR13 (both ROHS3 compliant). If RoHS compliance is not required, all substitute parts are acceptable from a regulatory standpoint.

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