MZP4751ARLG Equivalent & Substitute Parts

Part Overview

The MZP4751ARLG is a 30 V, 3 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole package with ±5% tolerance. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage, power, and thermal operating parameters while accommodating available packaging and manufacturer options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Power - Max	3	W
Tolerance	±5%	—
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 22.8 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	—

Substitute Part Grouping Explanation

Substitution of the MZP4751ARLG is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 30 V nominal (±5% tolerance required for direct equivalence)
Power dissipation capability: minimum 3 W for direct replacement; lower power ratings acceptable only in reduced-load applications
Impedance (Zzt): 40 Ohms maximum
Reverse leakage current: 5 µA @ 22.8 V
Forward voltage: 1.5 V maximum @ 200 mA

Mechanical & Thermal Criteria:

Mounting type: Through Hole (axial package)
Package / Case: DO-204AL or DO-41 compatible
Operating temperature range: -65°C to 200°C minimum (or -65°C to 175°C for limited-temperature applications)

Compliance & Status:

Product status: Active preferred (obsolete status of main part requires active substitutes)
REACH and ECCN compliance maintained across all substitutes

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (30 V, ±5% tolerance): Parts maintaining 30 V nominal voltage with ±5% tolerance specification. Power ratings vary from 1 W to 1.5 W, suitable for applications where the full 3 W capability is not required.

Category B - Higher Power Alternative (28 V, ±5% tolerance): The 1N5362BRLG provides 5 W power capability with 28 V nominal voltage, acceptable where voltage tolerance permits 2 V deviation and higher power dissipation is beneficial.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
MZP4751ARLG	onsemi	30 V	±5%	3 W	40 Ω	5 µA @ 22.8 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Obsolete
1N4751A	Lumimax Optoelectronic Technology	30 V	±5%	1 W	40 Ω	5 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL, DO-41	Active
1N4751ATR	Fairchild Semiconductor	30 V	±5%	1 W	40 Ω	5 µA @ 22.8 V	Not specified	-65 to 200°C	DO-204AL, DO-41	Active
1N4476	Microchip Technology	30 V	±5%	1.5 W	20 Ω	50 nA @ 24 V	1.5 V @ 1 A	-65 to 175°C	DO-204AL, DO-41	Active
1N4751AG	Microsemi Corporation	30 V	±5%	1 W	40 Ω	5 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 175°C	DO-204AL, DO-41	Active
1N4751AP/TR12	Microchip Technology	30 V	±5%	1 W	40 Ω	5 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N4751AP/TR8	Microchip Technology	30 V	±5%	1 W	40 Ω	5 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N5936P/TR12	Microchip Technology	30 V	±20%	1.5 W	28 Ω	1 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N5936P/TR8	Microchip Technology	30 V	±20%	1.5 W	28 Ω	1 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N5936PE3/TR12	Microchip Technology	30 V	±20%	1.5 W	28 Ω	1 µA @ 22.8 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL, DO-41	Active
1N5362BRLG	onsemi	28 V	±5%	5 W	6 Ω	500 nA @ 21.2 V	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Active

Engineering Selection Recommendations

For Direct Voltage and Tolerance Equivalence (30 V, ±5%):

The following parts provide exact electrical equivalence to the MZP4751ARLG in terms of nominal voltage and tolerance specification:

1N4751A (Lumimax): Active status, 1 W power rating, full temperature range (-65 to 200°C), identical impedance and leakage specifications. Suitable for applications where 1 W dissipation is sufficient.
1N4751ATR (Fairchild Semiconductor): Active status, 1 W power rating, full temperature range (-65 to 200°C), identical impedance and leakage specifications. Highest inventory availability (43,805 pcs).
1N4476 (Microchip Technology): Active status, 1.5 W power rating, improved impedance (20 Ω vs. 40 Ω), reduced reverse leakage (50 nA vs. 5 µA). Temperature range limited to -65 to 175°C. RoHS non-compliant.
1N4751AG (Microsemi Corporation): Active status, 1 W power rating, temperature range -65 to 175°C, identical impedance and leakage specifications.
1N4751AP/TR12 and 1N4751AP/TR8 (Microchip Technology): Active status, 1 W power rating, tape & reel packaging, temperature range -65 to 150°C. Suitable for automated assembly processes.

For Relaxed Tolerance Applications (30 V, ±20%):

1N5936P/TR12, 1N5936P/TR8, and 1N5936PE3/TR12 (Microchip Technology): Active status, 1.5 W power rating, ±20% tolerance, improved impedance (28 Ω), reduced reverse leakage (1 µA). Temperature range -65 to 150°C. 1N5936PE3/TR12 is ROHS3 compliant.

For Higher Power Requirement (28 V, ±5%):

1N5362BRLG (onsemi): Active status, 5 W power rating, 28 V nominal voltage (2 V deviation from original), significantly improved impedance (6 Ω), reduced reverse leakage (500 nA). Full temperature range (-65 to 200°C). ROHS3 compliant. Suitable where higher power dissipation is required and 2 V voltage deviation is acceptable.

Selection Priority Based on Product Status:

All substitute parts listed maintain active product status, ensuring long-term availability and supply chain continuity. The MZP4751ARLG obsolete status necessitates transition to one of these active alternatives.

Frequently Asked Questions (FAQ)

Q: Can 1 W rated Zener diodes replace the 3 W MZP4751ARLG?

A: Yes, provided the application circuit does not require the full 3 W dissipation capability. The 1 W alternatives (1N4751A, 1N4751ATR, 1N4751AG, 1N4751AP/TR12, 1N4751AP/TR8) maintain identical 30 V nominal voltage, ±5% tolerance, impedance, and leakage specifications. Circuit analysis must confirm that actual power dissipation remains below 1 W under all operating conditions.

Q: What is the difference between 1N4751AP/TR12 and 1N4751AP/TR8?

A: Both parts are electrically identical 30 V, 1 W Zener diodes from Microchip Technology with identical electrical specifications. The designation suffix indicates tape & reel packaging configuration: TR12 specifies 12 mm tape pitch, while TR8 specifies 8 mm tape pitch. Selection depends on automated assembly equipment compatibility.

Q: Why does 1N5936P have ±20% tolerance instead of ±5%?

A: The 1N5936P series is specified with ±20% tolerance, which is a broader voltage tolerance band. This part is suitable for applications where voltage regulation tolerance permits ±20% deviation from the 30 V nominal value (acceptable range: 24 V to 36 V). Applications requiring tighter ±5% tolerance must use alternative parts.

Q: Is the 1N5362BRLG (28 V) compatible with the MZP4751ARLG (30 V) application?

A: The 1N5362BRLG is compatible only in applications where a 2 V lower nominal voltage (28 V vs. 30 V) is acceptable. This part offers advantages in higher power dissipation (5 W vs. 3 W) and improved impedance (6 Ω vs. 40 Ω). Circuit voltage regulation requirements must be evaluated to determine acceptability of the 28 V nominal specification.

Q: What is the temperature range limitation for Microchip 1N4751AP parts?

A: Microchip 1N4751AP/TR12 and 1N4751AP/TR8 are specified for -65°C to 150°C operating temperature range, which is narrower than the original MZP4751ARLG (-65°C to 200°C). Applications requiring operation above 150°C must use alternative parts with extended temperature ratings (1N4751A, 1N4751ATR, or 1N5362BRLG).

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

A: Yes. The 1N5936PE3/TR12 is ROHS3 compliant. The 1N5362BRLG is ROHS3 compliant. Parts designated as 1N4751A, 1N4751ATR, 1N4751AG, 1N4751AP/TR12, 1N4751AP/TR8, 1N5936P/TR12, and 1N5936P/TR8 are RoHS non-compliant. Applications subject to RoHS requirements must specify ROHS3 compliant alternatives.

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

A: Impedance (Zzt) affects voltage regulation performance under dynamic load conditions. Lower impedance values provide better voltage regulation. The 1N5362BRLG (6 Ω) and 1N5936 series (28 Ω) offer improved impedance compared to the MZP4751ARLG (40 Ω), resulting in superior voltage stability under transient load changes. The 1N4476 (20 Ω) provides intermediate impedance performance.

Q: Can I use 1N4476 in place of MZP4751ARLG?

A: The 1N4476 is electrically compatible with 30 V, ±5% specification and offers improved impedance (20 Ω) and reduced reverse leakage (50 nA). However, the temperature range is limited to -65°C to 175°C (vs. -65°C to 200°C for the original), and it is RoHS non-compliant. Use is acceptable only in applications not exceeding 175°C and not subject to RoHS requirements.

Q: What inventory considerations apply to these substitute parts?

A: All listed substitute parts maintain active inventory status. The 1N4751ATR (Fairchild Semiconductor) offers the highest inventory availability at 43,805 pcs. Parts with lower inventory (773–1,468 pcs) may require longer lead times for large-volume orders. Procurement planning should account for inventory levels when selecting substitutes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message