1N4730ATR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4730ATR is a 3.9 V, 1 W Zener diode manufactured by onsemi in a through-hole DO-41 package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Zener diodes in this voltage and power rating are used for voltage regulation, overvoltage protection, and reference applications in electronic circuits. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications requiring 3.9 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.9	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	9	Ohms
Current - Reverse Leakage @ Vr	50	µA @ 1 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 1N4730ATR is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 3.9 V (exact match required)
Tolerance: ±5% or tighter (±1% acceptable)
Power - Max: 1 W or greater
Impedance (Max): 9 Ohms or lower
Current - Reverse Leakage @ Vr: 50 µA @ 1 V or lower
Operating Temperature Range: Must encompass -65°C to 200°C or be compatible with application requirements
Mounting Type: Through Hole (primary), Surface Mount (alternative for redesign)
Package / Case: DO-41 or DO-204AL (primary), Axial compatible

Substitute parts are grouped into three categories:

Direct Equivalents (Same Electrical & Package Specifications): Parts with identical voltage, tolerance, power rating, and through-hole DO-41 packaging.

Enhanced Equivalents (Improved Specifications): Parts with superior power ratings, tighter tolerance, or lower impedance while maintaining 3.9 V nominal voltage and through-hole mounting.

Alternative Mounting (Surface Mount): Parts meeting all electrical specifications but using surface-mount packaging for applications permitting PCB redesign.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Mounting	Package	Product Status
1N4730ATR	onsemi	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 200°C	Through Hole	DO-41	Obsolete
1N4730A,133	NXP USA Inc.	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 200°C	Through Hole	DO-41	Active
1N4730A,113	Nexperia USA Inc.	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 200°C	Through Hole	DO-41	Active
1N4730A TR	Central Semiconductor Corp	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 200°C	Through Hole	DO-41	Obsolete
1N4730AG	Microsemi Corporation	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 175°C	Through Hole	DO-41	Active
1N4730 G	Microsemi Corporation	3.9 V	±10%	1 W	9 Ω	50 µA @ 1 V	-65 to 175°C	Through Hole	DO-41	Active
1N4730A-TR	Vishay General Semiconductor	3.9 V	±5%	1.3 W	9 Ω	50 µA @ 1 V	-65 to 175°C	Through Hole	DO-41	Active
1N5915DG	Microsemi Corporation	3.9 V	±1%	1.25 W	7.5 Ω	25 µA @ 1 V	-65 to 175°C	Through Hole	DO-41	Active
2EZ3.9D5	Microsemi Corporation	3.9 V	±5%	2 W	5 Ω	30 µA @ 1 V	-65 to 150°C	Through Hole	DO-41	Active
1N5335BRLG	onsemi	3.9 V	±5%	5 W	2 Ω	50 µA @ 1 V	-65 to 200°C	Through Hole	Axial	Active
1N4730AUR	Microchip Technology	3.9 V	±5%	1 W	9 Ω	50 µA @ 1 V	-65 to 175°C	Surface Mount	DO-213AB	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Recommended for Immediate Substitution):

1N4730A,133 (NXP USA Inc.) and 1N4730A,113 (Nexperia USA Inc.) are the primary recommended substitutes. Both parts are active products with identical electrical specifications to the 1N4730ATR, including 3.9 V nominal voltage, ±5% tolerance, 1 W power rating, and -65°C to 200°C operating temperature range. Both maintain through-hole DO-41 packaging for direct PCB compatibility. NXP and Nexperia are established semiconductor manufacturers with robust supply chains and RoHS3 compliance certifications.

Tier 2 - Enhanced Performance Equivalents (For Improved Reliability):

1N4730A-TR (Vishay General Semiconductor) provides a 1.3 W power rating while maintaining all other specifications, offering thermal margin improvement. This part is AEC-Q101 qualified and RoHS3 compliant, suitable for automotive and industrial applications. 1N5915DG (Microsemi Corporation) offers superior specifications with ±1% tolerance, 1.25 W power rating, and lower impedance (7.5 Ω), providing tighter voltage regulation and reduced reverse leakage current (25 µA @ 1 V).

Tier 3 - Higher Power Alternatives (For Thermal Margin):

2EZ3.9D5 (Microsemi Corporation) provides 2 W power dissipation with improved impedance characteristics (5 Ω), suitable for applications requiring additional thermal headroom. 1N5335BRLG (onsemi) offers 5 W power rating with superior impedance (2 Ω), maintaining the original manufacturer's product line and -65°C to 200°C temperature range.

Tier 4 - Surface Mount Alternative (For PCB Redesign):

1N4730AUR (Microchip Technology) meets all electrical specifications in a surface-mount DO-213AB package. This option is applicable only when PCB redesign is feasible and surface-mount assembly is available.

Temperature Consideration:

The original 1N4730ATR specifies -65°C to 200°C operation. Substitutes 1N4730AG, 1N4730 G, 1N4730A-TR, 1N5915DG, 2EZ3.9D5, and 1N4730AUR limit operation to -65°C to 175°C. Applications requiring the full 200°C upper temperature limit must use 1N4730A,133, 1N4730A,113, or 1N5335BRLG.

Tolerance Consideration:

1N4730 G specifies ±10% tolerance, compared to the ±5% tolerance of the original part. This wider tolerance may be unsuitable for precision voltage regulation applications. All other substitutes maintain ±5% or tighter tolerance.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4730A,133 as a direct replacement for 1N4730ATR?

A: Yes. The 1N4730A,133 (NXP USA Inc.) is electrically and mechanically identical to the 1N4730ATR. Both specify 3.9 V nominal voltage, ±5% tolerance, 1 W power rating, 9 Ω maximum impedance, and -65°C to 200°C operating temperature. The through-hole DO-41 package is identical, permitting direct PCB substitution without design modification.

Q: What is the difference between 1N4730A,113 and 1N4730A,133?

A: Both parts are electrically equivalent with identical specifications: 3.9 V, ±5% tolerance, 1 W power, and DO-41 packaging. The primary difference is manufacturer: 1N4730A,113 is manufactured by Nexperia USA Inc., while 1N4730A,133 is manufactured by NXP USA Inc. Both are active products with RoHS3 compliance and equivalent supply availability.

Q: Why would I choose 1N5915DG over 1N4730A,133?

A: 1N5915DG offers superior specifications: ±1% tolerance (versus ±5%), 1.25 W power rating (versus 1 W), lower impedance (7.5 Ω versus 9 Ω), and reduced reverse leakage current (25 µA @ 1 V versus 50 µA @ 1 V). These improvements provide tighter voltage regulation and lower leakage, beneficial for precision applications. The trade-off is a reduced upper operating temperature limit of 175°C versus 200°C.

Q: Can I use 1N4730AUR in place of 1N4730ATR?

A: 1N4730AUR meets all electrical specifications but uses surface-mount DO-213AB packaging instead of through-hole DO-41. Direct PCB substitution is not possible without redesign. This option is applicable only when PCB layout permits surface-mount assembly and soldering equipment is available.

Q: Is 1N4730 G a suitable substitute?

A: 1N4730 G is electrically compatible but has two limitations: ±10% tolerance (versus ±5% for the original) and maximum operating temperature of 175°C (versus 200°C). The wider tolerance may compromise voltage regulation accuracy in precision applications. Use only when tolerance relaxation is acceptable and operating temperature does not exceed 175°C.

Q: What is the advantage of 2EZ3.9D5 over direct equivalents?

A: 2EZ3.9D5 provides 2 W power dissipation and lower impedance (5 Ω), offering improved thermal performance and voltage regulation characteristics. This part is suitable for applications with higher current demands or thermal constraints. The trade-off is a reduced upper operating temperature limit of 150°C.

Q: Why is 1N5335BRLG listed as a substitute if it has 5 W power rating?

A: 1N5335BRLG maintains the 3.9 V nominal voltage and ±5% tolerance of the original part, with superior power handling (5 W) and impedance (2 Ω). While the higher power rating exceeds the original 1 W specification, it provides thermal margin and improved regulation characteristics. The axial package is mechanically compatible with through-hole PCB layouts. This part is suitable for applications where thermal headroom or improved performance is beneficial.

Q: Are all substitute parts RoHS compliant?

A: RoHS compliance varies. 1N4730A,133, 1N4730A,113, 1N4730A-TR, and 2EZ3.9D5 are RoHS3 compliant. 1N4730AG, 1N4730 G, 1N5915DG, 1N4730AUR, and 1N5335BRLG are RoHS non-compliant or not specified. Verify RoHS requirements for your application before final part selection.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL are equivalent designations for the same through-hole axial package. Both refer to a cylindrical component with axial leads suitable for through-hole PCB assembly. All substitute parts listed use this package family, ensuring mechanical compatibility.

Q: Can I use multiple substitute parts interchangeably in production?

A: Yes, provided all parts meet your application's electrical and thermal requirements. 1N4730A,133 and 1N4730A,113 are fully interchangeable. Enhanced equivalents (1N4730A-TR, 1N5915DG, 2EZ3.9D5) may be used interchangeably if their improved specifications do not conflict with circuit design. Verify temperature range compatibility and tolerance requirements before implementing multi-source procurement.

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