SF31G-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF31G-TP 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 component is classified as Not For New Designs, indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary to support existing designs, maintenance applications, and legacy system repairs where this diode remains in service.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV
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	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SF31G-TP are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: 950 mV @ 3 A maximum
Reverse Recovery Time (trr): ≤ 500 ns (Fast Recovery classification)
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 50 V

Mechanical Equivalence Criteria:

Package / Case: DO-201AD, Axial
Mounting Type: Through Hole

Compliance Criteria:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Parts meeting all electrical, mechanical, and compliance parameters are classified as direct substitutes. Variations in capacitance, reverse recovery time within specification limits, and operating temperature ranges do not preclude substitution when all primary parameters align.

Parameter Comparison

Parameter	SF31G-TP (Main)	SF31G A0G (Substitute)	EGP30A (Parametric Equivalent)
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	Fairchild Semiconductor
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	95 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	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	REACH Unaffected

Engineering Selection Recommendations

SF31G A0G (Taiwan Semiconductor Corporation): This part is a direct electrical and mechanical substitute for the SF31G-TP. Both components share identical voltage, current, and forward voltage specifications. The SF31G A0G maintains ROHS3 compliance and REACH unaffected status. The primary distinction is product status: SF31G A0G is Active, whereas SF31G-TP is Not For New Designs. The SF31G A0G exhibits a slightly higher operating temperature minimum (-55°C versus -65°C) and increased capacitance (80 pF versus 50 pF), both of which remain within acceptable ranges for general purpose rectification applications. This substitute is suitable for direct replacement in existing designs.

EGP30A (Fairchild Semiconductor): This part is a parametric equivalent meeting all critical electrical specifications: 50 V reverse voltage, 3 A average rectified current, 950 mV forward voltage, and 5 µA reverse leakage current. The EGP30A is packaged identically in DO-201AD axial through-hole format. The reverse recovery time is 50 ns, which exceeds the SF31G-TP specification of 35 ns but remains within the Fast Recovery classification (≤ 500 ns). The EGP30A is Active status and REACH unaffected. Operating temperature range matches the SF31G-TP (-65°C ~ 150°C). Capacitance is higher at 95 pF. This part is suitable for applications where the slightly longer recovery time does not impact circuit performance.

Frequently Asked Questions (FAQ)

Q: Can SF31G A0G be used as a direct replacement for SF31G-TP?

A: Yes. Both parts meet identical electrical specifications for voltage (50 V), current (3 A), and forward voltage (950 mV @ 3 A). Both are packaged in DO-201AD axial through-hole format and maintain ROHS3 compliance. The SF31G A0G is Active status, making it available for procurement.

Q: What is the difference between SF31G A0G and EGP30A?

A: Both are suitable substitutes with identical voltage and current ratings. The primary difference is reverse recovery time: SF31G A0G matches the original specification at 35 ns, while EGP30A is 50 ns. For most general purpose rectification circuits, this difference is not critical. EGP30A has higher capacitance (95 pF versus 50 pF in the original), which may affect high-frequency performance in specific applications.

Q: Does the operating temperature range difference between SF31G-TP (-65°C ~ 150°C) and SF31G A0G (-55°C ~ 150°C) affect substitution?

A: The SF31G A0G minimum operating temperature is -55°C, compared to -65°C for the SF31G-TP. If the application requires operation below -55°C, the SF31G A0G is not suitable. For applications within -55°C to 150°C, the SF31G A0G is fully compatible.

Q: Are all three parts RoHS compliant?

A: SF31G-TP and SF31G A0G are both ROHS3 Compliant. EGP30A is REACH Unaffected. Both compliance statuses are acceptable for most applications; verify specific regulatory requirements for your end application.

Q: Can these diodes be used interchangeably in PCB designs?

A: Yes, all three parts use the DO-201AD axial through-hole package with identical pin configuration and footprint. No PCB layout modifications are required for substitution.

Q: Which substitute should be selected for new procurement?

A: Both SF31G A0G and EGP30A are Active status parts available for procurement. Selection depends on application requirements: choose SF31G A0G for exact parameter matching, or EGP30A if higher capacitance and slightly longer recovery time are acceptable.

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