1N4730A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4730A is a 3.9 V, 1 W Zener diode in DO-41 through-hole package manufactured by Diodes Incorporated. This component is classified as obsolete, though 35,100 units remain in stock. Zener diodes are used for voltage regulation and protection in electronic circuits. Due to the obsolete status of the original part, equivalent substitutes from active manufacturers are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	3.9 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	9 Ohms
Current - Reverse Leakage @ Vr	50 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N4730A is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 3.9 V nominal
Maximum power dissipation: 1 W
Package type: DO-41 through-hole
Voltage tolerance: ±5% or better
Impedance: 9 Ohms maximum
Forward voltage: 1.2 V maximum @ 200 mA

Substitution Categories:

Direct Commercial Equivalents maintain identical electrical specifications and commercial-grade status. These parts are manufactured by Nexperia USA Inc. and NXP USA Inc., both with active product status and extended operating temperature ranges (-65°C to 200°C).

Military-Grade Parametric Equivalents are manufactured by Microchip Technology under military qualification MIL-PRF-19500/115. These parts meet or exceed the electrical specifications of the 1N4730A with improved reverse leakage characteristics (25 µA @ 1 V versus 50 µA @ 1 V). Military-grade variants are available in tolerance grades of ±5%, ±2%, and ±1%, providing options for applications requiring tighter voltage regulation. The JAN, JANTX, and JANTXV designations indicate different screening and qualification levels within the military standard.

All substitute parts maintain DO-41 package compatibility, ROHS3 compliance, and EAR99 export classification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ 1V	Vf (Max) @ 200mA	Temp Range	Grade	Packaging
1N4730A-T	Diodes Incorporated	Obsolete	3.9 V	±5%	1 W	9 Ω	50 µA	1.2 V	-65°C ~ 175°C	Commercial	DO-41
1N4730A,113	Nexperia USA Inc.	Active	3.9 V	±5%	1 W	9 Ω	50 µA	1.2 V	-65°C ~ 200°C	Commercial	Cut Tape
1N4730A,133	NXP USA Inc.	Active	3.9 V	±5%	1 W	9 Ω	50 µA	1.2 V	-65°C ~ 200°C	Commercial	Bulk
JAN1N3823A-1/TR	Microchip Technology	Active	3.9 V	±5%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JAN1N3823C-1/TR	Microchip Technology	Active	3.9 V	±2%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JAN1N3823D-1/TR	Microchip Technology	Active	3.9 V	±1%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JANTX1N3823A-1/TR	Microchip Technology	Active	3.9 V	±5%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JANTX1N3823C-1/TR	Microchip Technology	Active	3.9 V	±2%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JANTX1N3823D-1/TR	Microchip Technology	Active	3.9 V	±1%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JANTXV1N3823A-1/TR	Microchip Technology	Active	3.9 V	±5%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel
JANTXV1N3823D-1/TR	Microchip Technology	Active	3.9 V	±1%	1 W	9 Ω	25 µA	1.2 V	-65°C ~ 175°C	Military	Tape & Reel

Engineering Selection Recommendations

For Commercial Applications with Standard Tolerance Requirements:

The 1N4730A,113 (Nexperia USA Inc.) and 1N4730A,133 (NXP USA Inc.) are direct commercial equivalents with active product status. Both maintain the ±5% tolerance specification and identical electrical performance to the original 1N4730A. The extended operating temperature range (-65°C to 200°C) provides additional margin over the original specification (-65°C to 175°C). Selection between these two depends on packaging requirements: Cut Tape format for automated assembly or Bulk packaging for manual assembly operations.

For Applications Requiring Military Qualification or Enhanced Reliability:

The Microchip Technology JAN, JANTX, and JANTXV series (1N3823 base part number) are qualified to MIL-PRF-19500/115 and provide superior reverse leakage characteristics (25 µA @ 1 V versus 50 µA @ 1 V). These parts are suitable for defense, aerospace, and high-reliability industrial applications. All military-grade variants are supplied in Tape & Reel packaging.

For Applications Requiring Tighter Voltage Tolerance:

Military-grade variants are available in three tolerance grades:

±5% tolerance: JAN1N3823A-1/TR, JANTX1N3823A-1/TR, JANTXV1N3823A-1/TR
±2% tolerance: JAN1N3823C-1/TR, JANTX1N3823C-1/TR
±1% tolerance: JAN1N3823D-1/TR, JANTX1N3823D-1/TR, JANTXV1N3823D-1/TR

Selection of tighter tolerance grades is determined by circuit voltage regulation requirements and is independent of the original 1N4730A specification.

All substitute parts maintain ROHS3 compliance and are classified as EAR99 for export purposes, matching the regulatory status of the original component.

Frequently Asked Questions (FAQ)

Q: Can the 1N4730A be directly replaced with the Nexperia or NXP equivalents?

A: Yes. The 1N4730A,113 and 1N4730A,133 are direct electrical and mechanical equivalents with identical zener voltage (3.9 V), power rating (1 W), tolerance (±5%), and DO-41 package. The primary difference is packaging format (Cut Tape versus Bulk) and extended operating temperature range (200°C maximum versus 175°C).

Q: What is the difference between commercial-grade and military-grade substitutes?

A: Commercial-grade parts (Nexperia, NXP) are manufactured to standard industrial specifications. Military-grade parts (Microchip Technology JAN series) are qualified to MIL-PRF-19500/115 and undergo additional screening and testing. Military-grade parts exhibit lower reverse leakage current (25 µA versus 50 µA @ 1 V) and are suitable for applications requiring enhanced reliability and traceability.

Q: Are the military-grade JAN, JANTX, and JANTXV designations interchangeable?

A: All three designations (JAN, JANTX, JANTXV) meet the same electrical specifications and MIL-PRF-19500/115 qualification. The designations indicate different screening levels and procurement requirements within the military standard. Selection depends on specific procurement and traceability requirements for the application.

Q: Can I use a ±1% tolerance part (1N3823D) in place of the ±5% original (1N4730A)?

A: Yes. The ±1% tolerance part is a superior specification that meets all electrical requirements of the ±5% original. Tighter tolerance provides improved voltage regulation accuracy. No circuit modifications are required.

Q: What packaging formats are available for substitutes?

A: Commercial equivalents are available in Cut Tape and Bulk formats. Military-grade parts are supplied exclusively in Tape & Reel format. All maintain the DO-41 through-hole package for direct PCB compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the regulatory status of the original 1N4730A.

Q: What is the impact of the extended temperature range in commercial equivalents?

A: The Nexperia and NXP equivalents specify -65°C to 200°C operating range, compared to -65°C to 175°C for the original. This provides additional thermal margin and is beneficial for applications operating at elevated temperatures. No circuit modifications are required.

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