FR301-AP Equivalent & Substitute Parts

Part Overview

The FR301-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, 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, maintenance, and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified performance characteristics within acceptable application parameters.

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 @ 3 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FR301-AP are classified into two categories based on electrical parameter alignment:

Direct Manufacturer Equivalent (FR301GP-AP): This part maintains identical voltage, current, and thermal specifications as the FR301-AP while offering improved performance characteristics. The reverse leakage current is reduced from 10 µA to 5 µA, and junction capacitance is reduced from 65 pF to 50 pF. The part is manufactured by the same supplier (Micro Commercial Co) and shares the same base product number (FR301). Critically, FR301GP-AP holds Active product status, ensuring ongoing availability and supply chain continuity.

Parametric Equivalent (FR301G A0G): This part is manufactured by Taiwan Semiconductor Corporation and maintains identical electrical specifications for voltage (50 V), current (3 A), forward voltage (1.3 V @ 3 A), and reverse recovery time (150 ns). The reverse leakage current is improved to 5 µA, and junction capacitance is reduced to 30 pF. This part shares the same base product number (FR301) and is classified as Active.

Similar Substitute (SF41G B0G): This part is manufactured by Taiwan Semiconductor Corporation and represents a higher-current alternative rated for 4 A average rectified current versus the 3 A specification of the FR301-AP. The reverse voltage rating remains 50 V. Forward voltage is improved to 1.0 V @ 4 A, and reverse recovery time is significantly reduced to 35 ns. This part is suitable for applications requiring higher current capacity within the same voltage class.

All substitute parts maintain DO-201AD axial through-hole packaging, identical mounting type, and compatible operating temperature range (-55°C to 150°C). All parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification.

Parameter Comparison

Parameter	FR301-AP (Main)	FR301GP-AP (Direct Equivalent)	FR301G A0G (Parametric Equivalent)	SF41G B0G (Similar Substitute)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	4 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	1.3 V @ 3 A	1.0 V @ 4 A
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	65 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Preferred): FR301GP-AP is the primary substitute for FR301-AP applications. This part is manufactured by the original supplier (Micro Commercial Co), maintains identical electrical specifications, and holds Active product status. The improved reverse leakage current (5 µA versus 10 µA) and reduced junction capacitance (50 pF versus 65 pF) provide enhanced performance characteristics without requiring circuit redesign. Current inventory of 665 pieces supports immediate procurement.

For Parametric Equivalence: FR301G A0G manufactured by Taiwan Semiconductor Corporation provides full electrical equivalence to the FR301-AP with identical voltage, current, and thermal ratings. This part offers superior reverse leakage performance (5 µA) and the lowest junction capacitance (30 pF) among all alternatives. Active product status and inventory of 1029 pieces ensure supply continuity. This part is suitable for applications where improved leakage and capacitance characteristics provide system benefits.

For Higher Current Applications: SF41G B0G is applicable when circuit design permits operation at 4 A average rectified current within the 50 V voltage class. This part delivers improved forward voltage characteristics (1.0 V @ 4 A) and significantly reduced reverse recovery time (35 ns), beneficial for high-frequency switching applications. The higher junction capacitance (100 pF) must be evaluated against circuit requirements. Active status and 790-piece inventory support procurement.

All substitute parts maintain ROHS3 compliance and MSL 1 classification, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can FR301GP-AP be used as a direct drop-in replacement for FR301-AP?

A: Yes. FR301GP-AP maintains identical voltage (50 V), current (3 A), forward voltage (1.3 V @ 3 A), reverse recovery time (150 ns), and operating temperature range (-55°C to 150°C) specifications. Both parts use DO-201AD axial through-hole packaging. The improved reverse leakage current and reduced junction capacitance of FR301GP-AP provide enhanced performance without circuit modification.

Q: What is the difference between FR301G A0G and FR301GP-AP?

A: Both parts are parametric equivalents with identical electrical specifications. FR301GP-AP is manufactured by Micro Commercial Co (original supplier), while FR301G A0G is manufactured by Taiwan Semiconductor Corporation. FR301G A0G offers superior reverse leakage performance (5 µA) and the lowest junction capacitance (30 pF) among all alternatives. Selection depends on supplier preference and supply chain requirements.

Q: When should SF41G B0G be selected instead of FR301-AP equivalents?

A: SF41G B0G is selected when circuit design permits operation at 4 A average rectified current. This part provides improved forward voltage (1.0 V @ 4 A) and significantly reduced reverse recovery time (35 ns), beneficial for high-frequency rectification applications. The 50 V reverse voltage rating remains identical. The higher junction capacitance (100 pF) must be evaluated against circuit switching frequency and impedance requirements.

Q: Are all substitute parts compatible with the DO-201AD package footprint?

A: Yes. All substitute parts (FR301GP-AP, FR301G A0G, and SF41G B0G) use DO-201AD axial through-hole packaging with identical mechanical dimensions and mounting type. Direct PCB footprint compatibility is maintained across all alternatives.

Q: What is the significance of the reverse leakage current difference between FR301-AP and its substitutes?

A: The FR301-AP specifies 10 µA reverse leakage at 50 V, while all substitute parts specify 5 µA at the same voltage. Lower reverse leakage current reduces parasitic current paths in high-impedance circuits and improves overall circuit efficiency. This improvement is particularly beneficial in precision rectification and low-power applications.

Q: How does reverse recovery time affect substitute part selection?

A: Reverse recovery time (trr) determines switching speed in rectification circuits. FR301-AP and its parametric equivalents (FR301GP-AP and FR301G A0G) specify 150 ns trr, suitable for standard rectification applications. SF41G B0G specifies 35 ns trr, enabling operation at higher switching frequencies with reduced switching losses. Selection depends on circuit operating frequency and efficiency requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. FR301GP-AP, FR301G A0G, and SF41G B0G are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity classification, matching the compliance profile of the FR301-AP. These parts are suitable for standard manufacturing and storage environments without special handling requirements.

Q: What is the impact of junction capacitance differences on circuit performance?

A: Junction capacitance affects high-frequency performance and switching characteristics. FR301-AP specifies 65 pF, FR301GP-AP specifies 50 pF, FR301G A0G specifies 30 pF, and SF41G B0G specifies 100 pF. Lower capacitance (FR301G A0G) reduces parasitic effects in high-frequency circuits. Higher capacitance (SF41G B0G) may require circuit evaluation in applications above 100 kHz switching frequency.

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