SF42G A0G Equivalent & Substitute Parts

Part Overview

The SF42G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 4 A average rectified current in a DO-201AD axial through-hole package. This component is classified as Active and complies with RoHS3 and REACH standards. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required for design flexibility, supply chain alternatives, or inventory management.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Mandatory Compatibility Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Package / Case: Must be DO-201AD, Axial
Mounting Type: Must be Through Hole
RoHS Status: Must be ROHS3 Compliant

Current Rating Consideration: The SF42G A0G is rated for 4 A average rectified current. Substitute parts with equal or higher current ratings maintain full compatibility. Parts with lower current ratings (3 A) operate within reduced capacity and are listed as substitutes where supply or design constraints apply.

Recovery Speed Consideration: The SF42G A0G features fast recovery (≤500 ns, >200 mA). Substitute parts with standard recovery (>500 ns) represent a functional trade-off in switching performance but maintain voltage and current compatibility.

The following parts meet the mandatory compatibility parameters and are classified as substitutes:

1N5401-E3/54 and 1N5401-E3/73: 100 V, 3 A, DO-201AD, standard recovery
60S1-TP: 100 V, 6 A, DO-201AD, standard recovery (Not For New Designs status)
GP30B-E3/54: 100 V, 3 A, DO-201AD, standard recovery, extended temperature range

Parameter Comparison

Parameter	SF42G A0G	1N5401-E3/54	1N5401-E3/73	60S1-TP	GP30B-E3/54
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Micro Commercial Co	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	4 A	3 A	3 A	6 A	3 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A	1.2 V @ 3 A	1.2 V @ 3 A	1 V @ 6 A	1.2 V @ 3 A
Speed	Fast Recovery ≤500ns, >200mA	Standard Recovery >500ns, >200mA	Standard Recovery >500ns, >200mA	Standard Recovery >500ns, >200mA	Standard Recovery >500ns, >200mA
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-50°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C
Product Status	Active	Active	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status):

1N5401-E3/54 and 1N5401-E3/73 are functionally equivalent substitutes with Active product status. Both are manufactured by Vishay General Semiconductor - Diodes Division and maintain 100 V reverse voltage rating and DO-201AD package compatibility. The 3 A current rating represents a reduction from the SF42G A0G 4 A specification; these parts are suitable for applications where the load current does not exceed 3 A. Both parts comply with RoHS3 and REACH standards.

GP30B-E3/54 is an Active substitute manufactured by Vishay General Semiconductor - Diodes Division, rated for 100 V and 3 A in DO-201AD package. This part features an extended operating temperature range (-65°C ~ 175°C) compared to the SF42G A0G (-55°C ~ 150°C), providing thermal margin for high-temperature applications. RoHS3 and REACH compliance is maintained.

Secondary Substitute (Not For New Designs):

60S1-TP is rated for 100 V and 6 A, exceeding the SF42G A0G current capacity. This part carries a "Not For New Designs" product status and is suitable only for legacy system maintenance or replacement scenarios where existing inventory is available. RoHS3 compliance is maintained.

Compliance Summary:

All substitute parts maintain RoHS3 Compliant and REACH Unaffected status, ensuring regulatory alignment with the original SF42G A0G component.

Frequently Asked Questions (FAQ)

Q: Can the 1N5401-E3/54 or 1N5401-E3/73 directly replace the SF42G A0G?

A: Yes, for applications where the average rectified current does not exceed 3 A. Both parts share the same 100 V reverse voltage rating, DO-201AD package, and through-hole mounting configuration. The primary difference is the reduced current rating (3 A versus 4 A) and standard recovery speed versus fast recovery. Verify that circuit load current remains within the 3 A specification.

Q: What is the difference between the SF42G A0G and the 60S1-TP?

A: The 60S1-TP is rated for 6 A average rectified current, compared to the SF42G A0G at 4 A. Both share 100 V reverse voltage and DO-201AD package specifications. The 60S1-TP carries a "Not For New Designs" status, indicating it is not recommended for new product development. Use this part only for replacement in existing systems.

Q: Why does the GP30B-E3/54 have a different operating temperature range?

A: The GP30B-E3/54 is rated for -65°C ~ 175°C, compared to the SF42G A0G at -55°C ~ 150°C. This extended range reflects the design specifications of the SUPERECTIFIER® series from Vishay. Select this part when applications require operation at temperatures below -55°C or above 150°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (1N5401-E3/54, 1N5401-E3/73, 60S1-TP, and GP30B-E3/54) are ROHS3 Compliant and REACH Unaffected, matching the regulatory status of the SF42G A0G.

Q: What is the significance of fast recovery versus standard recovery?

A: The SF42G A0G features fast recovery (≤500 ns), while all substitute parts feature standard recovery (>500 ns). Fast recovery reduces switching losses in high-frequency applications. Standard recovery parts are suitable for lower-frequency rectification circuits. Verify circuit operating frequency before substitution.

Q: Can I use a 3 A rated diode in a circuit designed for 4 A?

A: No. The 1N5401-E3/54, 1N5401-E3/73, and GP30B-E3/54 are rated for 3 A average rectified current. Using these parts in a circuit requiring 4 A operation exceeds the component specification and may result in thermal stress or failure. Confirm that actual circuit load current does not exceed 3 A before substitution.

Q: Is the 60S1-TP suitable for new product designs?

A: No. The 60S1-TP carries a "Not For New Designs" product status. This part is available for replacement in existing systems but should not be selected for new product development. Use 1N5401-E3/54, 1N5401-E3/73, or GP30B-E3/54 for new designs.

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