SF42G General Purpose Rectifier Diode - Equivalent & Substitute Parts

Part Overview

The SF42G is an active general purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100V DC reverse voltage and 4A average rectified current in a DO-201AD axial through-hole package. This component is designed for standard rectification applications requiring fast recovery characteristics. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

SF42G

Taiwan Semiconductor CorporationIn Stock: 1136SF42G Datasheet

Current PartRFQ

UF5401-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 15174UF5401-E3/54 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF42G is permissible with the UF5401-E3/54 based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 100 V (identical)
• Package / Case: DO-201AD, Axial (identical)
• Mounting Type: Through Hole (identical)
• Operating Temperature - Junction: -55°C to 150°C (identical)
• Technology: Standard (identical)
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (identical)
• REACH Status: REACH Unaffected (identical)

Differing Parameters:

• Current - Average Rectified (Io): SF42G rated 4A; UF5401-E3/54 rated 3A
• Reverse Recovery Time (trr): SF42G 35 ns; UF5401-E3/54 50 ns
• Current - Reverse Leakage @ Vr: SF42G 5 µA @ 100 V; UF5401-E3/54 10 µA @ 100 V
• Capacitance @ Vr, F: SF42G 100pF @ 4V, 1MHz; UF5401-E3/54 45pF @ 4V, 1MHz

The UF5401-E3/54 operates within the same voltage class and package footprint, enabling direct mechanical substitution in through-hole applications. Current rating differences require circuit-level evaluation to confirm suitability for specific load conditions.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (SF42G): The SF42G is the specified component for applications requiring 4A average rectified current at 100V reverse voltage with 35 ns reverse recovery time. This part maintains active product status and full ROHS3 compliance with unlimited moisture sensitivity rating.

Substitute Selection (UF5401-E3/54): The UF5401-E3/54 from Vishay General Semiconductor - Diodes Division is electrically and mechanically compatible for applications where the 3A current rating is sufficient. This substitute maintains identical voltage class, package form factor, and temperature operating range. Both components carry ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Selection Criteria:

• Use SF42G when circuit design requires 4A average rectified current capacity
• Use UF5401-E3/54 when circuit design operates at or below 3A average rectified current
• Both parts are suitable for -55°C to 150°C junction temperature environments
• Both parts are suitable for through-hole PCB assembly processes
• Both parts meet ROHS3 and REACH compliance requirements

Frequently Asked Questions (FAQ)

Q: Can the UF5401-E3/54 directly replace the SF42G in all applications?

A: Direct mechanical replacement is possible due to identical DO-201AD axial package and through-hole mounting. Electrical compatibility depends on circuit current requirements. The UF5401-E3/54 is rated for 3A average rectified current, while the SF42G is rated for 4A. Applications operating above 3A average rectified current require the SF42G.

Q: What are the key differences between these two diodes?

A: The primary differences are current rating (SF42G 4A vs. UF5401-E3/54 3A), reverse recovery time (SF42G 35 ns vs. UF5401-E3/54 50 ns), reverse leakage current (SF42G 5 µA vs. UF5401-E3/54 10 µA), and junction capacitance (SF42G 100pF vs. UF5401-E3/54 45pF). Both share identical 100V reverse voltage rating, DO-201AD package, and operating temperature range.

Q: Are both parts RoHS compliant?

A: Yes. Both the SF42G and UF5401-E3/54 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the DO-201AD package designation?

A: DO-201AD is an axial through-hole package standard for general purpose rectifier diodes. Both parts use this identical package, ensuring mechanical compatibility with existing PCB designs and assembly processes.

Q: How do reverse recovery time differences affect circuit performance?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectification circuits. The SF42G has a 35 ns recovery time compared to the UF5401-E3/54 at 50 ns. Applications sensitive to switching transients or operating at high frequencies should account for this 15 ns difference.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Both parts are classified as fast recovery diodes with recovery times ≤ 500ns for currents > 200mA. The SF42G offers faster recovery (35 ns) compared to the UF5401-E3/54 (50 ns). Circuit-specific frequency requirements determine interchangeability.

Q: What does MSL 1 (Unlimited) mean for these components?

A: Moisture Sensitivity Level 1 (Unlimited) indicates these components have no moisture sensitivity restrictions. They can be stored and handled without special moisture control measures, simplifying inventory and assembly logistics.