MZP4746ARLG Equivalent & Substitute Parts

Part Overview

The MZP4746ARLG is a Zener diode rated at 18 V, 1 W with ±5% tolerance, manufactured by onsemi in DO-204AL/DO-41 axial through-hole packaging. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -65°C to 200°C and features a maximum impedance of 20 Ohms with reverse leakage current of 5 µA at 13.7 V.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Power - Max	1	W
Tolerance	±5%	—
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 13.7 V
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 MZP4746ARLG is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Power - Max: 1 W (exact match required for direct substitutes; higher power ratings acceptable as upgrades)
Tolerance: ±5% (exact match required for direct substitutes; tighter tolerances acceptable)
Mounting Type: Through Hole (required)
Package / Case: DO-204AL, DO-41, or Axial (compatible formats)
Operating Temperature Range: -65°C minimum and 200°C maximum (or compatible subset)

Substitution Categories:

Direct Parametric Equivalents: Parts matching all electrical specifications (18 V, 1 W, ±5%, 20 Ohms impedance, 5 µA reverse leakage) with identical or superior performance characteristics and active product status.

Similar Equivalents with Enhanced Specifications: Parts matching core voltage and tolerance requirements but with higher power ratings (1.5 W or 3 W) or improved impedance characteristics. These provide functional equivalence with upgraded performance margins.

Package Variants: Parts with identical electrical specifications but different supplier device packaging (Cut Tape vs. Bulk) or minor package designations (DO-41 vs. DO-204AL).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance	Zzt (Ohms)	Reverse Leakage (µA @ V)	Temp Range (°C)	Package	Product Status
MZP4746ARLG	onsemi	18	1	±5%	20	5 @ 13.7	-65 to 200	DO-204AL, DO-41, Axial	Obsolete
1N4746A-T50A	onsemi	18	1	±5%	20	5 @ 13.7	-65 to 200	DO-41	Active
1N4746A	Microchip Technology	18	1	±5%	20	5 @ 13.7	-65 to 200	DO-204AL (DO-41)	Active
1N5931BRLG	onsemi	18	3	±5%	12	1 @ 13.7	-65 to 200	DO-204AL, DO-41, Axial	Active
1N4746ATR	onsemi	18	1	±5%	20	5 @ 13.7	-65 to 200	DO-41	Active
1N4471	Microchip Technology	18	1.5	±5%	11	0.05 @ 14.4	-65 to 175	DO-41	Active
1N4471D	Microchip Technology	18	1.5	±1%	11	0.05 @ 14.4	-65 to 175	DO-41	Active
1N4705	Microchip Technology	18	0.5	±5%	—	0.05 @ 13.6	-65 to 175	DO-35 (DO-204AH)	Active
1N4746A G	Microsemi Corporation	18	1	±5%	20	5 @ 13.7	-65 to 175	DO-204AL (DO-41)	Active
1N4746AGE3	Microchip Technology	18	1	±5%	20	5 @ 13.7	-65 to 175	DO-41	Active

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Recommended Primary Substitutes):

1N4746A-T50A (onsemi) and 1N4746ATR (onsemi) are direct electrical equivalents with identical specifications to the MZP4746ARLG. Both are active products with ROHS3 compliance and maintain the full -65°C to 200°C operating temperature range. The 1N4746A-T50A is supplied in Cut Tape packaging with 9,382 units in stock, while 1N4746ATR is also in Cut Tape format with 27,300 units available. Both parts are manufactured by onsemi, ensuring design continuity.

1N4746A (Microchip Technology) provides electrical equivalence with identical voltage, power, tolerance, and impedance specifications. This part is active with 50,200 units in stock. However, it carries RoHS non-compliant status and operates to -65°C to 200°C. The higher inventory level provides supply security.

Tier 2 - Enhanced Performance Substitutes:

1N5931BRLG (onsemi) is an active upgrade option with identical 18 V voltage and ±5% tolerance but increased power rating of 3 W (versus 1 W). The impedance is reduced to 12 Ohms, and reverse leakage is improved to 1 µA. This part maintains the full -65°C to 200°C temperature range and is ROHS3 compliant. Use this substitute when higher power dissipation capability is required or when improved impedance characteristics are beneficial.

1N4471 and 1N4471D (Microchip Technology) offer 1.5 W power rating with improved impedance of 11 Ohms and significantly lower reverse leakage (50 nA). The 1N4471D provides tighter ±1% tolerance. Both operate to -65°C to 175°C. These parts are suitable for applications requiring lower leakage or tighter voltage tolerance, though the reduced upper temperature limit (-175°C vs. -200°C) must be verified for compatibility.

1N4746A G (Microsemi Corporation) is an electrical equivalent with identical 18 V, 1 W, ±5% specifications and 20 Ohms impedance. It is active with 993 units in stock but operates to -65°C to 175°C, requiring temperature range verification.

1N4746AGE3 (Microchip Technology) matches all electrical specifications with identical voltage, power, tolerance, and impedance. It is ROHS3 compliant and active with 1,116 units in stock. Operating temperature is -65°C to 175°C.

Tier 3 - Reduced Performance Substitutes (Use Only When Necessary):

1N4705 (Microchip Technology) is a reduced-power option rated at 500 mW (0.5 W) with 18 V nominal voltage and ±5% tolerance. This part is suitable only for applications where the 1 W power rating of the original part is not required. It uses DO-35 (DO-204AH) packaging, which differs from the original DO-41 format and may require board layout modification.

Compliance and Regulatory Status:

Parts with ROHS3 compliance (1N4746A-T50A, 1N4746ATR, 1N5931BRLG, 1N4746AGE3) are preferred for new designs and applications subject to RoHS directives. All listed substitutes maintain REACH Unaffected status and EAR99 export classification, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4746A-T50A as a direct replacement for MZP4746ARLG?

A: Yes. The 1N4746A-T50A is a direct parametric equivalent with identical voltage (18 V), power (1 W), tolerance (±5%), impedance (20 Ohms), and operating temperature range (-65°C to 200°C). Both are through-hole axial devices. The primary difference is packaging format (Cut Tape vs. the original format) and active product status, making it a suitable replacement.

Q: What is the difference between 1N4746ATR and 1N4746A-T50A?

A: Both parts are manufactured by onsemi and share identical electrical specifications (18 V, 1 W, ±5%, 20 Ohms impedance, 5 µA reverse leakage, -65°C to 200°C). Both are supplied in Cut Tape packaging and are ROHS3 compliant. The primary distinction is inventory availability (1N4746ATR: 27,300 units; 1N4746A-T50A: 9,382 units). Either part is functionally equivalent for direct substitution.

Q: Why would I choose 1N5931BRLG over 1N4746A-T50A?

A: The 1N5931BRLG offers enhanced performance with 3 W power rating (versus 1 W), reduced impedance (12 Ohms versus 20 Ohms), and improved reverse leakage (1 µA versus 5 µA). Select this part when the application requires higher power dissipation capability, lower impedance characteristics, or improved leakage performance. It maintains the same 18 V voltage, ±5% tolerance, and full -65°C to 200°C temperature range.

Q: Can I use 1N4471 if my circuit operates at temperatures above 175°C?

A: No. The 1N4471 operates to a maximum of 175°C, while the original MZP4746ARLG operates to 200°C. If your application requires operation at temperatures between 175°C and 200°C, use 1N4746A-T50A, 1N4746ATR, 1N4746A (Microchip), or 1N5931BRLG, all of which support the full -65°C to 200°C range.

Q: What is the significance of the DO-41 versus DO-204AL package designation?

A: DO-41 and DO-204AL are equivalent package designations for the same through-hole axial diode format. Parts listed with either designation are physically and electrically compatible. The MZP4746ARLG is specified as DO-204AL, DO-41, Axial, indicating compatibility with all three designations. Substitutes using DO-41 or DO-204AL (DO-41) are directly compatible without board layout modification.

Q: Is 1N4705 a suitable substitute for MZP4746ARLG?

A: The 1N4705 is not recommended as a primary substitute. While it matches the 18 V voltage and ±5% tolerance, it is rated at only 500 mW (0.5 W) compared to the original 1 W rating. Additionally, it uses DO-35 (DO-204AH) packaging, which differs from the original DO-41 format and may require board layout changes. Use 1N4705 only if your application requires less than 500 mW power dissipation and board layout modification is acceptable.

Q: What does ROHS3 compliance mean for my design?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials. Parts marked ROHS3 Compliant (1N4746A-T50A, 1N4746ATR, 1N5931BRLG, 1N4746AGE3) are preferred for new designs and applications subject to RoHS regulations. The original MZP4746ARLG is marked REACH Unaffected, as are all listed substitutes.

Q: Can I use a Microchip Technology 1N4746A instead of an onsemi part?

A: Yes. The Microchip Technology 1N4746A is electrically equivalent with identical 18 V, 1 W, ±5%, 20 Ohms impedance, and 5 µA reverse leakage specifications. It operates across -65°C to 200°C. The primary consideration is that this part is RoHS non-compliant, whereas onsemi equivalents (1N4746A-T50A, 1N4746ATR) are ROHS3 compliant. For new designs, onsemi parts are preferred; for legacy designs, either manufacturer is acceptable.

Q: What is the difference between ±5% and ±1% tolerance?

A: Tolerance specifies the allowable deviation from the nominal 18 V zener voltage. ±5% tolerance allows deviation of ±0.9 V (range: 17.1 V to 18.9 V), while ±1% tolerance allows only ±0.18 V (range: 17.82 V to 18.18 V). The 1N4471D offers ±1% tolerance for applications requiring tighter voltage regulation. The original MZP4746ARLG and most direct substitutes use ±5% tolerance.

Q: How does reverse leakage current affect my circuit?

A: Reverse leakage current is the small current that flows through the diode when reverse-biased (operating in the zener regulation region). Lower leakage current reduces power dissipation and improves circuit efficiency. The original MZP4746ARLG specifies 5 µA at 13.7 V. The 1N5931BRLG offers improved leakage of 1 µA, while 1N4471 and 1N4471D offer 50 nA. For most applications, the difference is negligible; select lower leakage parts only if power efficiency is critical.

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