1A3 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 1A3 is a general purpose rectifier diode manufactured by SMC Diode Solutions, rated for 200 V DC reverse voltage and 1 A average rectified current. This component is designed for through-hole mounting in axial R-1 package configuration. The 1A3 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating potential package differences.

Substiute Parts

1A3

SMC Diode SolutionsIn Stock: 10381A3 Datasheet

Current PartRFQ

1N4003G

Taiwan Semiconductor CorporationIn Stock: 279541N4003G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1A3 is determined by strict equivalence across the following critical electrical parameters:

• Reverse Voltage Rating (Vr): 200 V maximum
• Average Rectified Current (Io): 1 A
• Forward Voltage Drop (Vf): 1 V maximum at 1 A
• Recovery Speed: Standard recovery classification (>500 ns, >200 mA)
• Reverse Leakage Current: 5 µA at 200 V
• Mounting Configuration: Through-hole axial package

The 1N4003G manufactured by Taiwan Semiconductor Corporation meets all electrical specifications required for direct substitution. While the 1N4003G uses a DO-204AL (DO-41) package instead of the R-1 package, both are through-hole axial configurations with compatible lead geometry for standard PCB mounting applications. The 1N4003G maintains active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The 1N4003G is a direct electrical equivalent to the obsolete 1A3 diode and is suitable for substitution in applications requiring 200 V, 1 A general purpose rectification. Selection of the 1N4003G is supported by the following factors:

Product Status: The 1N4003G maintains active product status with 27,889 pieces in current inventory, ensuring reliable procurement and supply chain continuity compared to the obsolete 1A3.

Electrical Equivalence: All critical electrical parameters—reverse voltage, average rectified current, forward voltage drop, recovery speed, and reverse leakage current—are identical between the two parts.

Compliance: Both parts carry identical REACH and ECCN classifications (REACH Unaffected, EAR99), confirming regulatory compatibility.

Package Compatibility: While the 1N4003G uses DO-204AL (DO-41) package designation versus the R-1 designation of the 1A3, both are through-hole axial packages with compatible lead spacing and mounting characteristics for standard PCB applications.

Thermal Performance: The 1N4003G operating temperature range (-55°C ~ 150°C) exceeds the 1A3 range (-65°C ~ 125°C), providing extended upper temperature capability.

Capacitance Consideration: The 1N4003G exhibits lower junction capacitance (10 pF versus 15 pF at 4V, 1MHz), which may provide improved performance in high-frequency switching applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N4003G directly replace the 1A3 in existing designs?

A: Yes. The 1N4003G meets all electrical specifications of the 1A3 and is suitable for direct substitution. Both components are through-hole axial diodes with compatible lead geometry. PCB layout modifications are not required.

Q: What is the difference between the R-1 and DO-204AL packages?

A: R-1 and DO-204AL (DO-41) are both through-hole axial package designations for general purpose rectifier diodes. Both use identical lead spacing and mounting methods. The different package codes reflect manufacturer nomenclature variations rather than physical incompatibility.

Q: Does the lower capacitance of the 1N4003G affect circuit performance?

A: The 1N4003G capacitance (10 pF) is lower than the 1A3 (15 pF) at the same measurement conditions. In most general purpose rectification applications, this difference is not significant. Applications sensitive to junction capacitance should evaluate circuit performance with the substitute part.

Q: Is the 1N4003G RoHS compliant?

A: The 1N4003G is ROHS3 compliant. Both parts carry REACH Unaffected status, confirming compliance with environmental regulations.

Q: Why is the 1A3 listed as obsolete?

A: The 1A3 is classified as obsolete by the manufacturer, indicating discontinued production. The 1N4003G provides an active, equivalent alternative for ongoing design support and procurement.

Q: What is the temperature operating range difference between the two parts?

A: The 1A3 operates from -65°C to 125°C, while the 1N4003G operates from -55°C to 150°C. The 1N4003G provides a higher maximum junction temperature rating, suitable for applications requiring extended thermal performance.

Q: Are there any electrical performance differences between the 1A3 and 1N4003G?

A: No. Both parts are rated for 200 V reverse voltage, 1 A average rectified current, 1 V forward voltage drop at 1 A, and 5 µA reverse leakage current at 200 V. Recovery speed specifications are identical.