FR301 Equivalent & Substitute Parts

Part Overview

The FR301 is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the through-hole DO-201AD package format.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 3 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitute parts for the FR301 are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Mandatory Compatibility Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-201AD, Axial (through-hole)
Mounting Type: Through Hole
Technology: Standard

Acceptable Variation Parameters:

Voltage - Forward (Vf): Equal to or lower than 1.3 V @ rated current
Reverse Recovery Time (trr): Equal to or lower than 150 ns
Current - Reverse Leakage: Equal to or lower than 5 µA @ 50 V
Operating Temperature - Junction: Minimum -55°C acceptable (FR301 specifies -65°C)
Capacitance @ Vr: Variation acceptable within standard manufacturing tolerances

Product Status Consideration: Direct substitutes must be in Active product status to ensure long-term availability and supply chain continuity.

Parameter Comparison

Parameter	FR301 (Main)	FR301G	FR301G A0G	SF31GHB0G	SF61G A0G
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	6 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	1.3 V @ 3 A	950 mV @ 3 A	975 mV @ 6 A
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	60 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz
Operating Temperature - Junction	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: FR301G and FR301G A0G

The FR301G and FR301G A0G, both manufactured by Taiwan Semiconductor Corporation, are direct electrical equivalents to the FR301. Both parts maintain identical voltage, current, and reverse recovery specifications. These parts are in Active product status, ensuring supply chain continuity. Both are ROHS3 compliant, meeting modern regulatory requirements. The primary difference is a reduced minimum operating temperature of -55°C compared to the FR301's -65°C specification; this is acceptable for applications not requiring sub-55°C operation. Capacitance is reduced to 30 pF, which may improve high-frequency performance characteristics.

Secondary Substitute: SF31GHB0G

The SF31GHB0G is electrically compatible with the FR301 at the 3 A current rating. This part offers improved performance characteristics including lower forward voltage (950 mV vs. 1.3 V) and significantly faster reverse recovery time (35 ns vs. 150 ns). The SF31GHB0G carries AEC-Q101 automotive qualification and is suitable for applications requiring enhanced switching performance. Operating temperature range is -55 to 150°C. This part is appropriate for designs where reduced power dissipation and faster switching are beneficial.

Tertiary Substitute: SF61G A0G

The SF61G A0G is rated for 6 A average rectified current, exceeding the FR301's 3 A specification. This part is suitable for applications where current headroom is required or where design consolidation across multiple current ratings is advantageous. Electrical characteristics include 975 mV forward voltage and 35 ns reverse recovery time. The higher current rating does not preclude use in 3 A applications; the part will operate within safe margins. Operating temperature range is -55 to 150°C.

All substitute parts maintain the DO-201AD axial through-hole package format, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can FR301G be used as a direct replacement for FR301?

A: Yes. The FR301G maintains identical voltage (50 V), current (3 A), forward voltage (1.3 V @ 3 A), and reverse recovery time (150 ns) specifications. The primary difference is the minimum operating temperature of -55°C versus -65°C for the FR301. For applications operating above -55°C, FR301G is a direct substitute. Both parts use the DO-201AD package.

Q: What is the difference between FR301G and SF31GHB0G?

A: Both parts are rated for 50 V and 3 A. The SF31GHB0G offers superior performance with lower forward voltage (950 mV vs. 1.3 V) and faster reverse recovery time (35 ns vs. 150 ns). The SF31GHB0G includes AEC-Q101 automotive qualification. Selection depends on whether improved switching performance and reduced power dissipation are required for the application.

Q: Can SF61G A0G replace FR301 in a 3 A circuit?

A: Yes. The SF61G A0G is rated for 6 A, which exceeds the FR301's 3 A requirement. The part will operate safely in a 3 A application with additional current margin. All other electrical parameters (50 V reverse voltage, forward voltage, recovery time) are compatible. The DO-201AD package remains unchanged.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. FR301G, FR301G A0G, SF31GHB0G, and SF61G A0G are all ROHS3 compliant. The original FR301 does not specify RoHS status. All substitute parts meet modern environmental and regulatory requirements.

Q: What is the minimum operating temperature for substitute parts?

A: All substitute parts (FR301G, FR301G A0G, SF31GHB0G, SF61G A0G) are rated for -55°C minimum junction temperature, compared to -65°C for the FR301. For applications requiring operation below -55°C, the FR301 specification must be maintained or alternative parts must be evaluated.

Q: Do all substitute parts use the same DO-201AD package?

A: Yes. All substitute parts use the DO-201AD axial through-hole package. No PCB layout or assembly process modifications are required for mechanical compatibility.

Q: What is the inventory status of substitute parts?

A: FR301G: 1123 pieces in stock. FR301G A0G: 1029 pieces in stock. SF31GHB0G: 932 pieces in stock. SF61G A0G: 761 pieces in stock. All parts are available as new original stock.

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