MZP4750ARLG Equivalent & Substitute Parts

Part Overview

The MZP4750ARLG is a Zener diode rated at 27 V nominal voltage with 3 W maximum power dissipation, manufactured by onsemi in an axial through-hole package (DO-204AL, DO-41). This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for applications utilizing this Zener diode specification.

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 (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 MZP4750ARLG is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Tolerance: ±5% or tighter
Power rating: 3 W or greater
Mounting type: Through Hole
Package compatibility: DO-204AL, DO-41, or Axial

Secondary Considerations:

Impedance (Zzt): Lower impedance values indicate improved regulation characteristics
Reverse leakage current: Lower values indicate better performance
Operating temperature range: Must encompass application requirements
Product status: Active parts ensure ongoing availability

Substitute parts are grouped into two categories:

Direct Equivalent (Matching 3 W Power Rating): Parts that maintain the full 3 W power specification, ensuring identical thermal and electrical performance characteristics.

Functional Equivalent (Lower Power Ratings: 1 W to 1.5 W): Parts that share the 27 V Zener voltage and axial through-hole package but with reduced power ratings. These are suitable for applications where the full 3 W dissipation is not required, offering improved availability and compliance status.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If	Temp Range (°C)	Package	Status
MZP4750ARLG	onsemi	27	±5%	3	35	5 @ 20.6	1.5 @ 200 mA	-65 to 200	DO-204AL, DO-41	Obsolete
1N5935BRLG	onsemi	27	±5%	3	23	1 @ 20.6	1.5 @ 200 mA	-65 to 200	DO-204AL, DO-41	Active
1N4750A	Lumimax Optoelectronic Technology	27	±5%	1	35	5 @ 20.6	1.2 @ 200 mA	-65 to 200	DO-204AL, DO-41	Active
1N4750ATR	Fairchild Semiconductor	27	±5%	1	35	5 @ 20.6	—	-65 to 200	DO-204AL, DO-41	Active
1N5361BG	onsemi	27	±5%	5	5	0.5 @ 20.6	1.2 @ 1 A	-65 to 200	T-18, Axial	Active
1N3030C-1	Microchip Technology	27	±2%	1	35	10 @ 20.6	1.2 @ 200 mA	-55 to 175	DO-204AL, DO-41	Active
1N4475	Microchip Technology	27	±5%	1.5	18	50 nA @ 21.6	1.5 @ 1 A	-65 to 175	DO-204AL, DO-41	Active
1N4475C	Microchip Technology	27	±2%	1.5	18	50 nA @ 21.6	1.5 @ 1 A	-65 to 175	DO-204AL, DO-41	Active
1N4711	Microchip Technology	27	±5%	0.5	—	10 nA @ 20.4	1.1 @ 200 mA	-65 to 175	DO-204AH, DO-35	Active
1N4750AP/TR12	Microchip Technology	27	±5%	1	35	5 @ 20.6	1.2 @ 200 mA	-65 to 150	DO-204AL, DO-41	Active
1N4750AP/TR8	Microchip Technology	27	±5%	1	35	5 @ 20.6	1.2 @ 200 mA	-65 to 150	DO-204AL, DO-41	Active

Engineering Selection Recommendations

Primary Recommendation: 1N5935BRLG (onsemi)

The 1N5935BRLG is the optimal direct equivalent for the MZP4750ARLG. Both parts are manufactured by onsemi, share identical 27 V nominal voltage and 3 W power rating, and are housed in compatible DO-204AL/DO-41 axial packages. The 1N5935BRLG offers superior electrical characteristics with lower impedance (23 Ohms vs. 35 Ohms) and significantly reduced reverse leakage current (1 µA vs. 5 µA), resulting in improved voltage regulation. The part is currently in active production status with ROHS3 compliance and REACH unaffected designation, ensuring long-term supply availability and regulatory compliance.

Secondary Recommendation: 1N5361BG (onsemi)

The 1N5361BG provides a higher power-rated alternative at 5 W, suitable for applications requiring enhanced thermal margin or higher current dissipation. This part maintains the 27 V Zener voltage and axial through-hole configuration. The significantly lower impedance (5 Ohms) and minimal reverse leakage (500 nA) deliver superior regulation performance. The T-18 package is mechanically compatible with standard axial mounting. Active production status and ROHS3 compliance support long-term availability.

Functional Alternatives (1 W to 1.5 W Power Ratings):

For applications where the full 3 W dissipation is not required, the following parts provide active, compliant alternatives:

1N4475 / 1N4475C (Microchip Technology): 1.5 W rating with excellent impedance (18 Ohms) and extremely low reverse leakage (50 nA). The 1N4475C variant offers tighter ±2% tolerance. Both support the full -65°C to 175°C operating range.
1N4750A / 1N4750ATR / 1N4750AP/TR12 / 1N4750AP/TR8 (Multiple Manufacturers): 1 W rating with standard impedance (35 Ohms) and reverse leakage (5 µA). Available from Lumimax Optoelectronic Technology, Fairchild Semiconductor, and Microchip Technology in various packaging formats (bulk, tape & reel).
1N3030C-1 (Microchip Technology): 1 W rating with ±2% tolerance and standard impedance. Operating temperature range is -55°C to 175°C, which is narrower than the original part.

Not Recommended:

The 1N4711 (500 mW) is unsuitable as a direct substitute due to its significantly lower power rating and different package format (DO-35/DO-204AH), which may require circuit board layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5935BRLG directly replace the MZP4750ARLG without circuit modifications?

A: Yes. The 1N5935BRLG is a direct electrical and mechanical equivalent. Both parts share identical 27 V nominal voltage, 3 W power rating, ±5% tolerance, and compatible DO-204AL/DO-41 axial packages. The 1N5935BRLG exhibits superior performance characteristics (lower impedance and reverse leakage), making it a drop-in replacement with no circuit design changes required.

Q: What is the difference between the 1 W and 3 W rated Zener diodes?

A: The power rating indicates the maximum continuous power dissipation the diode can handle. A 3 W diode can dissipate three times more heat than a 1 W diode. Selection depends on the application's current and voltage conditions. If your circuit dissipates less than 1 W, a 1 W rated diode is acceptable. If dissipation approaches or exceeds 1 W, the 3 W rated part (1N5935BRLG or 1N5361BG) is required to ensure reliable operation and prevent thermal failure.

Q: Are the 1N4750A variants (1N4750AP/TR12, 1N4750AP/TR8) interchangeable?

A: The 1N4750AP/TR12 and 1N4750AP/TR8 are electrically identical 1 W Zener diodes with the same electrical specifications. The designation difference (TR12 vs. TR8) refers to the tape & reel packaging configuration used for automated assembly. They are functionally interchangeable but have different maximum operating temperatures (-65°C to 150°C) compared to the original MZP4750ARLG (-65°C to 200°C). Verify that your application does not require operation above 150°C.

Q: Why does the 1N5361BG have a different package designation (T-18) compared to the original part?

A: The 1N5361BG uses a T-18 axial package, which is a larger diameter variant of the standard axial package. Both are through-hole axial configurations and are mechanically compatible with standard component mounting. The T-18 package accommodates the higher 5 W power rating and provides improved heat dissipation. Verify that your circuit board layout has sufficient space for the larger package diameter.

Q: What does "impedance (Zzt)" mean, and why is it important?

A: Impedance (Zzt) is the dynamic resistance of the Zener diode in its regulation region. Lower impedance values indicate better voltage regulation—the output voltage remains more stable as load current changes. The original MZP4750ARLG has 35 Ohms impedance. The 1N5935BRLG (23 Ohms) and 1N5361BG (5 Ohms) provide superior regulation. For precision voltage reference applications, select parts with lower impedance values.

Q: Can I use a 1.5 W rated diode (1N4475) instead of the 3 W rated original part?

A: The 1N4475 is suitable only if your application's power dissipation does not exceed 1.5 W. The 1N4475 offers excellent impedance (18 Ohms) and extremely low reverse leakage (50 nA), providing superior regulation performance. However, if your circuit requires the full 3 W dissipation capability, the 1N4475 will overheat and fail. Perform a thermal analysis of your application to determine the actual power dissipation before selecting a lower-rated substitute.

Q: What is the significance of the ±2% tolerance variants (1N3030C-1, 1N4475C)?

A: The ±2% tolerance variants provide tighter Zener voltage accuracy compared to the standard ±5% tolerance. These are suitable for applications requiring precise voltage regulation. The original MZP4750ARLG specifies ±5% tolerance. If your design requires ±2% accuracy, select the tighter tolerance variant. If ±5% is acceptable, either tolerance grade will function correctly.

Q: Why is the MZP4750ARLG listed as obsolete?

A: Obsolete status indicates that the manufacturer (onsemi) has discontinued production and no longer accepts new orders. The part may still be available from inventory held by distributors, but supply is finite and will eventually be exhausted. Identifying and qualifying active substitute parts ensures long-term design sustainability and supply chain continuity.

Q: Are there compliance or regulatory differences between the substitute parts?

A: Yes. The 1N5935BRLG is ROHS3 compliant, while some alternatives (1N4475, 1N4750AP variants) are listed as RoHS non-compliant. If your application or market requires RoHS compliance, select the 1N5935BRLG, 1N5361BG, or 1N4475C. All listed parts have REACH unaffected status and EAR99 export classification.

Q: Can I use the 1N4711 (500 mW) as a substitute?

A: The 1N4711 is not recommended as a direct substitute. Its 500 mW power rating is significantly lower than the original 3 W specification, and it uses a different package format (DO-35/DO-204AH) that may require circuit board layout modifications. Use the 1N4711 only if your application's power dissipation is confirmed to be below 500 mW and the smaller package is acceptable.

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