1N4001 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 1N4001 is a general purpose rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 axial package. This component is classified as obsolete, indicating that the original manufacturer (SMC Diode Solutions) has discontinued production. Locating equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-65°C ~ 125°C	-

Substitute Part Grouping Explanation

Substitution of the 1N4001 is determined by matching the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1 V @ 1 A (or within acceptable circuit tolerance)
Speed Classification: Standard or Fast Recovery acceptable
Current - Reverse Leakage @ Vr: Must not exceed 5 µA @ 50 V (or within acceptable circuit tolerance)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required)
Package / Case: DO-204AL, DO-41, or Axial (interchangeable)

Product Status Consideration:

Active status parts are preferred for new designs
Not For New Designs parts are acceptable for legacy applications
Obsolete parts require substitution

The substitute parts listed below meet all electrical parameters and mechanical requirements for direct replacement in the 1N4001 application.

Parameter Comparison

Parameter	1N4001 (SMC)	1N4001G (Taiwan Semiconductor)	1N4001RLG (onsemi)	1N4933-T (Diodes Inc.)	1N4933G (Good-Ark)
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1.1 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A
Speed	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	-	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-65°C ~ 125°C	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 150°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Not For New Designs	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status):

1N4001G (Taiwan Semiconductor Corporation) - Recommended for new designs. Active product status with ROHS3 compliance. Electrical parameters match the original 1N4001 specification exactly. Operating temperature range extends to 150°C, providing enhanced thermal margin. Capacitance is reduced to 10 pF, which may improve high-frequency performance in certain applications.
1N4933-T (Diodes Incorporated) - Active product status with ROHS3 compliance. Offers fast recovery characteristics (≤ 500 ns) compared to the standard recovery of the original 1N4001. Forward voltage is elevated to 1.2 V @ 1 A, which is acceptable for most general purpose rectification applications. Reverse recovery time is specified at 200 ns, providing improved switching performance.
1N4933G (Good-Ark Semiconductor) - Active product status with ROHS3 compliance. Fast recovery diode with 200 ns reverse recovery time. Electrical parameters are equivalent to 1N4933-T. Operating temperature range matches the original 1N4001 (-55°C ~ 125°C).

Secondary Substitute (Legacy Applications):

1N4001RLG (onsemi) - Product status is Not For New Designs. Acceptable for legacy system repairs and maintenance. ROHS3 compliant. Reverse leakage current is elevated to 10 µA @ 50 V, which remains within acceptable limits for general purpose rectification. Operating temperature range extends to 175°C.

Selection Criteria:

For new designs: Select 1N4001G or 1N4933-T
For legacy applications: 1N4001RLG or 1N4933G are acceptable
All substitute parts are through-hole axial packages compatible with DO-41 footprints
All substitute parts carry ROHS3 compliance and REACH Unaffected status

Frequently Asked Questions (FAQ)

Q: Can the 1N4001G directly replace the obsolete 1N4001?

A: Yes. The 1N4001G meets all electrical and mechanical requirements for direct replacement. Both parts are rated for 50 V reverse voltage, 1 A average rectified current, and feature identical forward voltage characteristics (1 V @ 1 A). Both use through-hole DO-41 axial packaging. The 1N4001G is an active product with ROHS3 compliance.

Q: What is the difference between standard recovery and fast recovery diodes?

A: The 1N4001 and 1N4001G are standard recovery diodes with recovery times exceeding 500 ns. The 1N4933-T and 1N4933G are fast recovery diodes with recovery times of 200 ns or less. Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Both types are suitable for general purpose rectification at 50 Hz / 60 Hz line frequencies.

Q: Are the 1N4933-T and 1N4933G suitable replacements for the 1N4001?

A: Yes, with consideration of forward voltage characteristics. The 1N4933 series has a forward voltage of 1.2 V @ 1 A compared to 1 V @ 1 A for the 1N4001. This 0.2 V difference is acceptable in most general purpose rectification circuits. The 1N4933 series offers improved switching performance due to fast recovery characteristics.

Q: What is the significance of the 1N4001RLG being marked "Not For New Designs"?

A: This designation indicates that onsemi has discontinued active development and marketing of this part for new applications. However, the part remains available for legacy system support and repairs. The 1N4001RLG is suitable for maintaining existing equipment but should not be selected for new product designs.

Q: Are all substitute parts compatible with the original DO-41 footprint?

A: Yes. All substitute parts listed are through-hole axial components with DO-204AL or DO-41 package designations. These packages are mechanically and electrically interchangeable. The axial lead configuration is identical across all parts, allowing direct PCB footprint compatibility.

Q: What is the impact of the 10 µA reverse leakage current in the 1N4001RLG compared to 5 µA in other parts?

A: The 1N4001RLG reverse leakage current of 10 µA @ 50 V is twice that of the original 1N4001 and other substitutes. This parameter affects circuit performance in high-impedance applications or precision rectification circuits. For standard general purpose rectification, this difference is typically negligible. Verify circuit requirements if reverse leakage is a critical design parameter.

Q: Do all substitute parts have ROHS3 compliance?

A: Yes. All active substitute parts (1N4001G, 1N4933-T, 1N4933G) and the legacy part (1N4001RLG) carry ROHS3 compliance certification. All parts are REACH Unaffected. These certifications ensure compliance with environmental and hazardous substance regulations for both new designs and legacy applications.

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

A: The 1N4001G operates from -55°C to 150°C, the 1N4933-T from -65°C to 150°C, the 1N4933G from -55°C to 125°C, and the 1N4001RLG from -65°C to 175°C. The original 1N4001 operates from -65°C to 125°C. For applications requiring extended low-temperature operation, the 1N4933-T or 1N4001RLG are preferred. For extended high-temperature operation, the 1N4001RLG is optimal.

Q: Can capacitance differences between parts affect circuit performance?

A: The 1N4001G has 10 pF capacitance compared to 15 pF in the original 1N4001, 1N4933-T, and 1N4933G. Lower capacitance reduces junction capacitance effects at high frequencies. For standard 50 Hz / 60 Hz rectification applications, this difference is negligible. For high-frequency switching applications, the lower capacitance of the 1N4001G may provide improved performance.

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