MZP4745ARLG Equivalent & Substitute Parts

Part Overview

The MZP4745ARLG is a 16 V, 3 W Zener diode manufactured by onsemi in DO-204AL/DO-41 axial through-hole packaging. This component is classified as obsolete, indicating discontinuation from the manufacturer. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Substitute selection must maintain electrical compatibility across voltage regulation, power dissipation, and thermal operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Power - Max	3	W
Tolerance	±5%	-
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 12.2 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 MZP4745ARLG is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 16 V (exact match required)
Tolerance: ±5% (acceptable range for voltage regulation)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: DO-204AL, DO-41, or Axial variants (physical fit)

Secondary Compatibility Factors:

Power - Max: Minimum 3 W (equal or greater power rating)
Impedance (Max): 16 Ohms or lower (dynamic impedance performance)
Current - Reverse Leakage @ Vr: 5 µA or lower (leakage characteristics)
Operating Temperature: -65°C to 200°C or compatible range overlap

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (3 W Power Rating): Parts with 3 W or greater power dissipation capacity, matching the original specification exactly.

Category B - Functional Substitutes (1 W to 1.5 W Power Rating): Parts with reduced power ratings (1 W to 1.5 W) suitable for applications where the full 3 W capacity is not required. These maintain voltage regulation and thermal stability within reduced power envelopes.

Category C - Enhanced Performance (5 W Power Rating): Parts with increased power ratings (5 W) providing superior thermal margin and extended operational capability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Power - Max (W)	Tolerance	Impedance (Max) (Ohms)	Current - Reverse Leakage @ Vr (µA)	Voltage - Forward (Vf) (Max) @ If (V)	Operating Temperature (°C)	Package / Case	Product Status
MZP4745ARLG	onsemi	16	3	±5%	16	5 @ 12.2 V	1.5 @ 200 mA	-65 to 200	DO-204AL, DO-41, Axial	Obsolete
1N4745A	Lumimax Optoelectronic Technology	16	1	±5%	16	5 @ 12.2 V	1.2 @ 200 mA	-65 to 200	DO-204AL, DO-41, Axial	Active
1N4745ATR	Fairchild Semiconductor	16	1	±5%	16	5 @ 12.2 V	Not specified	-65 to 200	DO-204AL, DO-41, Axial	Active
1N5353BRLG	onsemi	16	5	±5%	2.5	1 @ 12.2 V	1.2 @ 1 A	-65 to 200	T-18, Axial	Active
1N4470	Microchip Technology	16	1.5	±5%	10	50 nA @ 12.8 V	1.5 @ 1 A	-65 to 175	DO-204AL, DO-41, Axial	Active
1N4745A,113	Nexperia USA Inc.	16	1	±5%	16	5 @ 12.2 V	1.2 @ 200 mA	-65 to 200	DO-204AL, DO-41, Axial	Active
1N4745A,133	NXP USA Inc.	16	1	±5%	16	5 @ 12.2 V	1.2 @ 200 mA	-65 to 200	DO-204AL, DO-41, Axial	Active
1N4745AP/TR8	Microchip Technology	16	1	±5%	16	5 @ 12.2 V	1.2 @ 200 mA	-65 to 150	DO-204AL, DO-41, Axial	Active
1N5353CE3/TR13	Microchip Technology	16	5	±2%	2.5	1 @ 11.5 V	1.2 @ 1 A	-65 to 150	T-18, Axial	Active
1N5930P/TR12	Microchip Technology	16	1.5	±20%	10	1 @ 12.2 V	1.2 @ 200 mA	-65 to 150	DO-204AL, DO-41, Axial	Active

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

No active substitute parts maintain the exact 3 W power rating of the MZP4745ARLG. The closest functional equivalent is the 1N5353BRLG (onsemi, 5 W, 16 V), which provides superior power dissipation capacity and is manufactured by the same supplier as the original part. This part is active and RoHS3 compliant. The T-18 package requires mechanical verification for board layout compatibility.

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

The following parts are suitable for applications where full 3 W dissipation is not required:

1N4745A,113 (Nexperia USA Inc., 1 W, 16 V, ROHS3 Compliant): Maintains ±5% tolerance, identical impedance (16 Ohms), and full temperature range (-65°C to 200°C). Cut Tape packaging available.
1N4745A,133 (NXP USA Inc., 1 W, 16 V): Identical electrical specifications to 1N4745A,113. Bulk packaging available.
1N4745AP/TR8 (Microchip Technology, 1 W, 16 V): Maintains electrical compatibility with reduced operating temperature range (-65°C to 150°C). Tape & Reel packaging.
1N4470 (Microchip Technology, 1.5 W, 16 V): Provides intermediate power rating with superior reverse leakage characteristics (50 nA vs. 5 µA). Operating temperature range limited to -65°C to 175°C. RoHS non-compliant.

For Enhanced Thermal Performance (5 W):

1N5353CE3/TR13 (Microchip Technology, 5 W, 16 V, ±2% tolerance): Provides tighter voltage tolerance and significantly lower impedance (2.5 Ohms vs. 16 Ohms). Operating temperature range -65°C to 150°C. ROHS3 compliant. T-18 package requires mechanical verification.

Compliance Considerations:

Parts with active product status and RoHS3 compliance are preferred for new designs. The 1N4745A variants from Nexperia and NXP provide the most direct electrical equivalence with modern compliance certifications. The 1N5930P/TR12 exhibits ±20% tolerance, which may not be acceptable for precision voltage regulation applications requiring ±5% tolerance.

Frequently Asked Questions (FAQ)

Q: Can the 1 W rated 1N4745A series directly replace the 3 W MZP4745ARLG?

A: The 1N4745A series maintains identical voltage regulation (16 V ±5%), impedance (16 Ohms), and thermal operating range (-65°C to 200°C). Direct replacement is permissible only in applications where power dissipation does not exceed 1 W. Circuit analysis must confirm that the reduced power rating does not compromise thermal stability or voltage regulation performance under maximum load conditions.

Q: What is the difference between DO-41 and T-18 packages?

A: Both are through-hole axial packages for Zener diodes. DO-41 (DO-204AL) is the standard package for 1 W to 1.5 W diodes. T-18 is a larger package used for higher power ratings (5 W). Physical dimensions differ; board layout and lead spacing must be verified before substitution.

Q: Why does the 1N5930P/TR12 have ±20% tolerance instead of ±5%?

A: The 1N5930P/TR12 is specified with ±20% voltage tolerance, which is a wider acceptance band than the original ±5% specification. This part is suitable only for applications where voltage regulation tolerance is not critical. For precision voltage reference applications, parts with ±5% or tighter tolerance are required.

Q: Is the 1N5353BRLG suitable for direct replacement in all applications?

A: The 1N5353BRLG provides superior power handling (5 W vs. 3 W) and lower impedance (2.5 Ohms vs. 16 Ohms), making it functionally superior. However, the T-18 package has different physical dimensions than the DO-41 package of the original part. Board layout compatibility must be verified. The part is active and RoHS3 compliant, making it suitable for new designs.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current (measured at specified reverse voltage) indicates the quality of the diode junction. Lower leakage current (1 µA vs. 5 µA) represents superior junction characteristics and reduced parasitic current paths. The 1N5353 series exhibits lower leakage (1 µA), while most 1N4745A variants maintain 5 µA leakage, matching the original specification.

Q: Can I use the 1N4470 in place of the MZP4745ARLG?

A: The 1N4470 maintains 16 V nominal voltage and ±5% tolerance with 1.5 W power rating. The operating temperature range is limited to -65°C to 175°C (vs. -65°C to 200°C for the original). This part is suitable for applications where the maximum operating temperature does not exceed 175°C and power dissipation does not exceed 1.5 W. RoHS non-compliance may restrict use in regulated industries.

Q: What does "Product Status: Active" mean for substitute parts?

A: Active product status indicates the part is currently manufactured and available from the supplier. This ensures long-term availability for production runs and future repairs. The original MZP4745ARLG is classified as obsolete, meaning it is no longer manufactured and existing inventory is limited.

Q: Are all substitute parts REACH compliant?

A: Yes, all substitute parts listed are REACH Unaffected, indicating compliance with REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. This applies to both RoHS-compliant and RoHS non-compliant parts in this list.

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