1N4730A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4730A is a through-hole zener diode rated at 3.9 V nominal with 1 W maximum power dissipation in a DO-41 axial package. This component is classified as obsolete by the original manufacturer (SMC Diode Solutions), necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Zener diodes in this voltage and power class are used for voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. The obsolete status of the original part requires substitution with active production equivalents that maintain identical electrical and mechanical specifications.

Substiute Parts

1N4730A

SMC Diode SolutionsIn Stock: 203331N4730A Datasheet

Current PartRFQ

1N4730A,113

Nexperia USA Inc.In Stock: 84811N4730A,113 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Electrical Specifications:

• Zener voltage (Vz): 3.9 V nominal with ±5% tolerance
• Maximum power dissipation: 1 W
• Maximum impedance (Zzt): 9 Ohms
• Reverse leakage current: 50 µA @ 1 V
• Forward voltage: 1.2 V maximum @ 200 mA

Mechanical Specifications:

• Package type: DO-41 axial through-hole configuration
• Mounting: Through-hole PCB assembly

Substitute parts must match all electrical parameters within the specified tolerances and maintain the identical DO-41 through-hole package form factor to ensure direct PCB compatibility without layout modifications.

Parameter Comparison

Engineering Selection Recommendations

1N4730A,113 (Nexperia USA Inc.) is the direct functional equivalent for the obsolete 1N4730A (SMC Diode Solutions).

Basis for Selection:

All electrical parameters match exactly: 3.9 V zener voltage, ±5% tolerance, 1 W power rating, 9 Ohms maximum impedance, 50 µA reverse leakage, and 1.2 V forward voltage specification. The mechanical package (DO-41 through-hole axial) is identical, enabling direct PCB substitution without layout changes.

The Nexperia part carries active product status, ensuring long-term availability and supply chain continuity. The component is ROHS3 compliant and maintains REACH unaffected status, meeting current regulatory requirements. The extended operating temperature range (-65°C to 200°C) provides broader environmental compatibility compared to the original specification.

Moisture sensitivity level (MSL 1 - Unlimited) and ECCN/HTSUS classifications are identical between the original and substitute part.

Frequently Asked Questions (FAQ)

Q: Can the 1N4730A,113 be used as a direct replacement for the 1N4730A?

A: Yes. The 1N4730A,113 is electrically and mechanically equivalent. All zener voltage, power rating, impedance, leakage current, and forward voltage specifications are identical. The DO-41 through-hole package is the same, permitting direct PCB substitution without modification.

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

A: The primary difference is product status: the SMC part is obsolete, while the Nexperia part is in active production. The Nexperia variant includes ROHS3 compliance certification and specifies an extended operating temperature range (-65°C to 200°C versus 200°C maximum for the original). All electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: Both parts use the DO-41 axial through-hole package. The Nexperia part is supplied in Cut Tape (CT) packaging, while the original SMC part packaging format is not specified. This difference affects procurement and handling but does not impact electrical performance or PCB assembly compatibility.

Q: Does the Nexperia part meet current regulatory requirements?

A: Yes. The 1N4730A,113 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components in most jurisdictions.

Q: Can I use a different zener voltage rating as a substitute?

A: No. Zener voltage is a critical parameter for voltage regulation and protection circuits. Only parts rated at 3.9 V ±5% are functionally equivalent. Different voltage ratings will alter circuit behavior and may cause circuit malfunction or component damage.

Q: What if I cannot source the Nexperia 1N4730A,113?

A: Consult the component manufacturer's datasheet for alternative part numbers within the same base product family (1N4730 series). Ensure any alternative maintains identical electrical specifications: 3.9 V nominal zener voltage, ±5% tolerance, 1 W power rating, and DO-41 through-hole package configuration.