1N4003 Equivalent & Substitute Parts

Part Overview

The 1N4003 is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This part is classified as obsolete, indicating it is no longer in active production. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for applications utilizing this rectifier diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 175	°C

Substitute Part Grouping Explanation

Substitute parts for the 1N4003 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial configurations

Technology Considerations: Substitute parts may employ either standard recovery (>500 ns) or fast recovery (≤500 ns) technology. Fast recovery diodes are functionally compatible with standard recovery applications and offer improved performance characteristics.

Temperature Range: Operating temperature ranges must encompass the application requirements. Parts with extended temperature ranges (-65°C to 175°C) provide broader operational flexibility compared to the original 1N4003 specification (-55°C to 175°C).

Product Status: Active parts are preferred for new designs and ongoing production. Parts marked "Not For New Designs" remain functionally equivalent but are suitable only for legacy system support and maintenance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	Speed	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
1N4003	onsemi	200	1	1.1	Standard >500ns	10 @ 200V	DO-41	-55 to 175	Obsolete
1N4003G	Taiwan Semiconductor Corporation	200	1	1.0	Standard >500ns	5 @ 200V	DO-204AL (DO-41)	-55 to 150	Active
1N4003RLG	onsemi	200	1	1.1	Standard >500ns	10 @ 200V	Axial	-65 to 175	Not For New Designs
1N4935G	Taiwan Semiconductor Corporation	200	1	1.2	Fast ≤500ns	5 @ 200V	DO-204AL (DO-41)	-55 to 150	Active
1N4935RLG	onsemi	200	1	1.2	Fast ≤500ns	5 @ 200V	Axial	-65 to 150	Not For New Designs
EGP10D	Fairchild Semiconductor	200	1	0.95	Fast ≤500ns	5 @ 200V	DO-204AL (DO-41)	-65 to 150	Active
MUR120G	onsemi	200	1	0.875	Fast ≤500ns	2 @ 200V	Axial	-65 to 175	Active
MUR120RLG	onsemi	200	1	0.875	Fast ≤500ns	2 @ 200V	Axial	-65 to 175	Active
RGP10D	Fairchild Semiconductor	200	1	1.3	Fast ≤500ns	5 @ 200V	DO-204AL (DO-41)	-65 to 175	Active
UF4003	Diotec Semiconductor	200	1	1.0	Fast ≤500ns	5 @ 200V	DO-41/DO-204AC	-50 to 175	Active
1N4003GP-E3/54	Vishay General Semiconductor - Diodes Division	200	1	1.1	Standard >500ns	5 @ 200V	DO-204AL (DO-41)	-65 to 175	Active

Engineering Selection Recommendations

Direct Equivalent (Active Status): The 1N4003GP-E3/54 manufactured by Vishay General Semiconductor is the primary direct equivalent. It maintains identical electrical specifications (200 V, 1 A, 1.1 V forward voltage, standard recovery) and extends the operating temperature range to -65°C to 175°C. This part carries ROHS3 compliance and active product status, making it suitable for both legacy system support and new designs.

Alternative with Improved Performance (Active Status): The 1N4003G manufactured by Taiwan Semiconductor Corporation provides electrical equivalence with reduced forward voltage (1.0 V vs. 1.1 V) and lower reverse leakage current (5 µA vs. 10 µA). This part is active and ROHS3 compliant, though the operating temperature range is limited to -55°C to 150°C.

Fast Recovery Alternatives (Active Status): Parts including EGP10D, MUR120G, MUR120RLG, RGP10D, and UF4003 employ fast recovery technology (≤500 ns) and are functionally compatible with standard recovery applications. These parts offer superior switching characteristics and lower reverse leakage current. MUR120G and MUR120RLG provide the lowest forward voltage (0.875 V) and extended temperature range (-65°C to 175°C).

Legacy System Support (Not For New Designs): The 1N4003RLG and 1N4935RLG remain available for maintenance and repair of existing systems but are not recommended for new design implementations.

Compliance and Certification: All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component manufacturing and distribution.

Frequently Asked Questions (FAQ)

Q: Can the 1N4003G directly replace the 1N4003? A: Yes. The 1N4003G maintains the same 200 V reverse voltage, 1 A current rating, and standard recovery characteristics. The forward voltage is slightly lower (1.0 V vs. 1.1 V), and reverse leakage is reduced (5 µA vs. 10 µA), both favorable characteristics. The operating temperature range is -55°C to 150°C, which covers the original -55°C to 175°C specification at the lower end but does not extend to 175°C.

Q: What is the difference between standard recovery and fast recovery diodes? A: Standard recovery diodes have recovery times exceeding 500 ns, while fast recovery diodes have recovery times of 500 ns or less. Fast recovery diodes are functionally compatible with standard recovery applications and provide improved switching performance, lower reverse leakage, and reduced power dissipation. They are suitable as direct replacements in rectifier applications.

Q: Are axial package diodes compatible with DO-41 package requirements? A: Axial and DO-41 packages are mechanically different. DO-41 refers to the DO-204AL package with specific lead spacing and form factor. Axial packages have different physical dimensions and lead configurations. Mechanical compatibility must be verified based on PCB layout and mounting requirements. The 1N4003RLG and 1N4935RLG are available in axial configuration for applications requiring this package type.

Q: Why do some substitutes have lower operating temperature maximums? A: The 1N4003G and 1N4935G are rated to 150°C maximum junction temperature, compared to the original 1N4003 specification of 175°C. This reflects manufacturer design specifications and thermal characteristics. For applications requiring operation at temperatures above 150°C, alternatives such as 1N4003GP-E3/54, MUR120G, MUR120RLG, or RGP10D with 175°C ratings are required.

Q: Is the 1N4003GP-E3/54 suitable for new designs? A: Yes. The 1N4003GP-E3/54 is classified as active and ROHS3 compliant. It provides direct electrical equivalence to the 1N4003 with extended temperature range (-65°C to 175°C) and improved reverse leakage characteristics (5 µA vs. 10 µA). This part is recommended for both legacy system maintenance and new design implementations.

Q: What is the advantage of MUR120G and MUR120RLG over the 1N4003? A: The MUR120 series offers fast recovery technology (35 ns recovery time), significantly lower forward voltage (0.875 V vs. 1.1 V), and reduced reverse leakage current (2 µA vs. 10 µA). These characteristics result in lower power dissipation and improved efficiency in rectifier applications. Both MUR120G and MUR120RLG are active products with extended temperature range (-65°C to 175°C) and ROHS3 compliance.

Q: Can I use UF4003 as a substitute for the 1N4003? A: Yes. The UF4003 is electrically compatible with 200 V reverse voltage and 1 A current rating. It employs fast recovery technology (50 ns) and offers lower forward voltage (1.0 V). The operating temperature range is -50°C to 175°C, which covers the original specification above -50°C. The UF4003 is active and ROHS3 compliant.

Q: What does "Not For New Designs" mean for 1N4003RLG and 1N4935RLG? A: This designation indicates that these parts remain available for maintenance, repair, and support of existing systems but are not recommended for incorporation into new product designs. These parts are functionally equivalent and suitable for legacy system applications where the original part number or equivalent is required.

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