SF45G A0G Equivalent & Substitute Parts

Part Overview

The SF45G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 300 V DC reverse voltage and 4 A average rectified current. The device features fast recovery characteristics with a reverse recovery time of 35 ns and is housed in a DO-201AD axial through-hole package. This diode is classified as Active product status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining the same package form factor and mounting technology. Substitution becomes necessary when the primary part experiences supply constraints, extended lead times, or inventory limitations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 4 A	V
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5 @ 300 V	µA
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the SF45G A0G is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V minimum
Package / Case: DO-201AD, Axial form factor
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 150°C minimum

Allowable Variation Criteria:

Current - Average Rectified (Io): Equal to or greater than 4 A
Voltage - Forward (Vf): Equal to or less than 1.3 V at rated current
Reverse Recovery Time (trr): Any value (fast or standard recovery acceptable)
Current - Reverse Leakage: Equal to or less than 5 µA @ 300 V

The substitute part 1N5403-E3/54 shares the identical voltage rating, package form factor, and mounting technology. However, the average rectified current rating is 3 A, which is lower than the primary part's 4 A specification. This represents a current derating and requires circuit-level evaluation to confirm suitability.

Parameter Comparison

Parameter	SF45G A0G	1N5403-E3/54	Match Status
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Different
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	Matched
Current - Average Rectified (Io)	4 A	3 A	Derated
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 4 A	1.2 V @ 3 A	Lower in Substitute
Reverse Recovery Time (trr)	35 ns (Fast Recovery)	Standard Recovery >500 ns	Different
Current - Reverse Leakage @ Vr	5 µA @ 300 V	5 µA @ 300 V	Matched
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Matched
Mounting Type	Through Hole	Through Hole	Matched
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Matched
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
REACH Status	REACH Unaffected	REACH Unaffected	Matched

Engineering Selection Recommendations

SF45G A0G (Primary Part): The SF45G A0G is the specified component with Active product status. It provides 4 A average rectified current capacity with fast recovery characteristics (35 ns trr). This part is suitable for applications requiring the full 4 A current rating and fast switching performance. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

1N5403-E3/54 (Substitute Part): The 1N5403-E3/54 is an Active product from Vishay General Semiconductor - Diodes Division. It maintains the 300 V voltage rating, identical package form factor (DO-201AD), and through-hole mounting. However, the current rating is reduced to 3 A, and recovery characteristics are standard (>500 ns) rather than fast. RoHS3 compliance and REACH unaffected status are maintained. This substitute is applicable only in circuits where the 3 A current specification is sufficient and standard recovery speed is acceptable.

Both parts carry identical reverse leakage characteristics (5 µA @ 300 V) and operate across the same temperature range (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can the 1N5403-E3/54 directly replace the SF45G A0G in all applications?

A: No. The 1N5403-E3/54 has a lower average rectified current rating (3 A versus 4 A) and standard recovery speed instead of fast recovery. Substitution is valid only when circuit design accommodates the 3 A current limit and standard recovery characteristics do not compromise performance.

Q: What is the significance of the recovery time difference between these parts?

A: The SF45G A0G features fast recovery (35 ns), while the 1N5403-E3/54 has standard recovery (>500 ns). Fast recovery diodes switch more rapidly, reducing switching losses and electromagnetic interference. Standard recovery diodes are suitable for lower-frequency applications where switching speed is not critical.

Q: Are both parts physically interchangeable?

A: Yes, both parts use the DO-201AD axial package with through-hole mounting. Physical installation is identical. However, electrical performance differences require circuit-level validation before substitution.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the SF45G A0G and 1N5403-E3/54 are RoHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.

Q: What is the forward voltage difference between these parts?

A: The SF45G A0G has a maximum forward voltage of 1.3 V at 4 A, while the 1N5403-E3/54 has 1.2 V at 3 A. The lower forward voltage in the substitute part reduces power dissipation at its rated current, but this advantage does not apply if the circuit requires the full 4 A capacity.

Q: Can the SF45G A0G be used in place of the 1N5403-E3/54?

A: Yes. The SF45G A0G exceeds the electrical specifications of the 1N5403-E3/54 in current capacity and recovery speed, making it a suitable upgrade substitute. However, this may introduce unnecessary cost or performance overhead depending on circuit requirements.

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