SF41G A0G Equivalent & Substitute Parts

Part Overview

The SF41G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 4 A average rectified current in a DO-201AD axial through-hole package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A	V
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 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

Substitute parts for the SF41G A0G are identified based on the following critical parameters that determine functional equivalence:

Voltage Rating Compatibility: All substitute parts maintain the 50 V DC reverse voltage maximum, ensuring safe operation in circuits designed for this voltage class.

Package Compatibility: All substitute parts use the DO-201AD axial through-hole package, permitting direct mechanical and electrical interchange on printed circuit boards without layout modification.

Reverse Leakage Current: All substitute parts specify 5 µA @ 50 V reverse leakage, matching the primary part's leakage characteristics.

Current Rating Consideration: The substitute parts (1N5400-E3/54 and 1N5400-E3/73) are rated for 3 A average rectified current, which is lower than the primary part's 4 A rating. These parts are suitable for applications where the circuit current requirement does not exceed 3 A.

Recovery Speed Classification: The substitute parts operate in the Standard Recovery category (>500 ns), differing from the primary part's Fast Recovery classification (≤500 ns, 35 ns trr). This distinction affects switching performance in high-frequency applications.

Compliance Status: All parts maintain RoHS3 compliance and REACH Unaffected status, ensuring regulatory alignment.

Parameter Comparison

Parameter	SF41G A0G	1N5400-E3/54	1N5400-E3/73
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	4 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A	1.2 V @ 3 A	1.2 V @ 3 A
Speed Classification	Fast Recovery ≤ 500 ns	Standard Recovery > 500 ns	Standard Recovery > 500 ns
Reverse Recovery Time (trr)	35 ns	Not specified	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	100 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Part Selection: The SF41G A0G is the specified component and remains the first choice when 4 A current capacity and fast recovery characteristics (35 ns trr) are required. All three parts maintain Active product status and full regulatory compliance (RoHS3, REACH Unaffected).

Substitute Selection Criteria:

The 1N5400-E3/73 provides the closest operational match to the SF41G A0G. Both parts support the full operating temperature range of -55°C to 150°C and maintain identical reverse leakage specifications. This part is suitable for applications where the circuit current requirement does not exceed 3 A and where standard recovery speed is acceptable.

The 1N5400-E3/54 operates within a narrower temperature range (-50°C to 150°C) compared to the primary part. This part is suitable for applications where the minimum operating temperature requirement is -50°C or higher and where circuit current does not exceed 3 A.

Current Rating Limitation: Both substitute parts are rated for 3 A average rectified current. Circuits designed for the full 4 A capacity of the SF41G A0G require verification that actual operating current does not exceed 3 A before substitution.

Recovery Speed Consideration: The substitute parts operate as Standard Recovery devices (>500 ns), whereas the SF41G A0G is classified as Fast Recovery (≤500 ns, 35 ns trr). In applications where switching frequency or transient response is critical, the recovery speed difference must be evaluated against circuit performance requirements.

Compliance Alignment: All three parts are RoHS3 compliant and REACH Unaffected, ensuring regulatory compatibility in applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can the 1N5400-E3/54 or 1N5400-E3/73 be used as direct replacements for the SF41G A0G?

A: Both parts share the same DO-201AD axial through-hole package and 50 V voltage rating, permitting mechanical and electrical interchange on the printed circuit board. However, the 3 A current rating of the substitute parts is lower than the primary part's 4 A rating. Substitution is valid only when the circuit's actual operating current does not exceed 3 A.

Q: What is the difference between Fast Recovery and Standard Recovery classifications?

A: The SF41G A0G is classified as Fast Recovery with a reverse recovery time of 35 ns. The substitute parts are classified as Standard Recovery with recovery times exceeding 500 ns. Fast Recovery diodes are used in high-frequency switching applications where rapid reverse bias recovery is required. Standard Recovery diodes are suitable for lower-frequency rectification applications. The choice between these classifications depends on the circuit's operating frequency and switching requirements.

Q: Are there temperature range differences between the substitute parts?

A: The 1N5400-E3/54 operates from -50°C to 150°C, while both the SF41G A0G and 1N5400-E3/73 operate from -55°C to 150°C. If the application requires operation below -50°C, the 1N5400-E3/73 is the appropriate substitute. The 1N5400-E3/54 is suitable for applications where the minimum operating temperature is -50°C or higher.

Q: What is the significance of the capacitance difference between the primary part and substitute parts?

A: The SF41G A0G specifies 100 pF @ 4V, 1MHz, while the substitute parts specify 30 pF @ 4V, 1MHz. Lower capacitance in the substitute parts may result in different transient response characteristics in circuits sensitive to junction capacitance. This parameter should be evaluated in applications where high-frequency performance or switching transients are critical.

Q: Do all three parts meet the same regulatory requirements?

A: Yes. The SF41G A0G, 1N5400-E3/54, and 1N5400-E3/73 are all RoHS3 compliant and REACH Unaffected. All parts carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications, ensuring regulatory alignment for applications subject to these standards.

Q: What is the difference between the two 1N5400-E3 variants?

A: The 1N5400-E3/54 and 1N5400-E3/73 are electrically identical, both rated for 50 V and 3 A with Standard Recovery characteristics. The primary difference is the operating temperature range: the 1N5400-E3/54 operates from -50°C to 150°C, while the 1N5400-E3/73 operates from -55°C to 150°C. The selection between these variants depends on the application's minimum operating temperature requirement.

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