SF51-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF51-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 5 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements. The SF51-TP operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 5 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SF51-TP are classified into two categories based on electrical parameter alignment:

Parametric Equivalents maintain identical or superior electrical characteristics across all critical parameters: reverse voltage (50 V), average rectified current (5 A), forward voltage drop (950 mV @ 5 A), and reverse recovery time (35 ns). These parts are direct functional replacements with no circuit redesign required.

Similar Substitutes share the same reverse voltage rating (50 V) and package format (DO-201AD, axial through-hole) but differ in average rectified current capacity or other secondary electrical characteristics. These parts are suitable for applications where the lower current rating does not exceed circuit requirements.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Package / Case: Must be DO-201AD, Axial
Mounting Type: Must be Through Hole
Current - Average Rectified (Io): Must meet or exceed application requirements

Parameter Comparison

Parameter	SF51-TP (Main)	EGP51A-E3/D	FR301G B0G	ER500_R2_00001
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Panjit International Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	5 A	5 A	3 A	5 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 5 A	960 mV @ 5 A	1.3 V @ 3 A	950 mV @ 5 A
Reverse Recovery Time (trr)	35 ns	50 ns	150 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	45 pF @ 4V, 1MHz	117 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	65 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 ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

EGP51A-E3/D (Vishay General Semiconductor) is the primary substitute for the SF51-TP. This part maintains identical voltage and current ratings (50 V, 5 A) with equivalent forward voltage characteristics (960 mV @ 5 A versus 950 mV @ 5 A). The EGP51A-E3/D is active in production, offers an extended operating temperature range (-65°C to 175°C), and is part of the SUPERECTIFIER® series. Reverse recovery time is 50 ns compared to 35 ns in the SF51-TP, representing a minor performance difference acceptable for general purpose rectification applications. This part is suitable for direct replacement in existing designs.

ER500_R2_00001 (Panjit International Inc.) is a parametric equivalent offering identical electrical performance to the SF51-TP. This part matches the 50 V reverse voltage, 5 A current rating, 950 mV forward voltage drop, and 35 ns reverse recovery time. The ER500_R2_00001 is active in production, RoHS3 compliant, and features lower reverse leakage current (1 µA versus 5 µA). This part is supplied in Tape & Reel packaging format and is suitable for high-volume manufacturing environments.

FR301G B0G (Taiwan Semiconductor Corporation) is a similar substitute with reduced current capacity (3 A versus 5 A). This part maintains the 50 V reverse voltage rating and DO-201AD package format but is suitable only for applications where the circuit current requirement does not exceed 3 A. The FR301G B0G is active in production and RoHS3 compliant. Forward voltage at rated current is higher (1.3 V @ 3 A), and reverse recovery time is longer (150 ns), reflecting different device characteristics.

Selection between EGP51A-E3/D and ER500_R2_00001 depends on packaging requirements and supplier availability. Both are direct replacements for the SF51-TP in 5 A applications. The FR301G B0G is appropriate only when circuit current requirements are confirmed at 3 A or below.

Frequently Asked Questions (FAQ)

Q: Can the EGP51A-E3/D replace the SF51-TP in all applications?

A: The EGP51A-E3/D is a direct substitute for the SF51-TP in applications requiring 50 V reverse voltage and 5 A average rectified current. Both parts use the DO-201AD axial through-hole package. The forward voltage drop difference (960 mV versus 950 mV) and reverse recovery time difference (50 ns versus 35 ns) are within acceptable tolerances for general purpose rectification circuits.

Q: What is the difference between the ER500_R2_00001 and EGP51A-E3/D?

A: Both parts are 50 V, 5 A rectifier diodes with identical forward voltage (950 mV @ 5 A) and reverse recovery time (35 ns). The primary differences are manufacturer (Panjit versus Vishay), packaging format (Tape & Reel versus standard), and reverse leakage current (1 µA versus 5 µA). Both are suitable direct replacements for the SF51-TP.

Q: Can the FR301G B0G be used as a substitute for the SF51-TP?

A: The FR301G B0G is suitable only for applications where the circuit current requirement does not exceed 3 A. The part maintains the 50 V reverse voltage rating and DO-201AD package format but has reduced current capacity compared to the SF51-TP (3 A versus 5 A). If the application requires 5 A capability, the FR301G B0G is not appropriate.

Q: Are all substitute parts RoHS3 compliant?

A: The SF51-TP, FR301G B0G, and ER500_R2_00001 are all RoHS3 compliant. The EGP51A-E3/D RoHS status is not specified in the provided data.

Q: What is the operating temperature range difference between the SF51-TP and EGP51A-E3/D?

A: The SF51-TP operates from -55°C to 150°C junction temperature. The EGP51A-E3/D operates from -65°C to 175°C, providing a wider temperature range. This extended range may be beneficial in applications subject to extreme environmental conditions.

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

A: All substitute parts (EGP51A-E3/D, FR301G B0G, and ER500_R2_00001) use the DO-201AD axial through-hole package, ensuring mechanical and electrical compatibility with existing PCB designs and assembly processes.

Q: What is the significance of reverse recovery time in selecting a substitute?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectification circuits. The SF51-TP has a trr of 35 ns. The EGP51A-E3/D has 50 ns, and the FR301G B0G has 150 ns. For general purpose rectification at line frequencies, these differences are typically not critical. For higher frequency applications, shorter reverse recovery time may be preferred.

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