SF25G-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF25G-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 300V DC reverse voltage and 2A average rectified current in a through-hole DO-15 package configuration. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where original components may be unavailable or where active product alternatives offer improved availability and compliance status.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 2 A	V
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5 @ 300 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SF25G-TP are identified based on electrical and mechanical parameter equivalence within the general purpose rectifier diode category. The substitution logic is based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V
Current - Average Rectified (Io): 2 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 2 A
Reverse Recovery Time (trr): 35 ns
Current - Reverse Leakage @ Vr: 5 µA @ 300 V
Technology: Standard

Mechanical Equivalence Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial
RoHS Status: ROHS3 Compliant

Parts meeting all electrical and mechanical criteria are classified as direct substitutes. Minor variations in secondary parameters (such as capacitance or operating temperature range) do not disqualify substitution when primary electrical ratings and package specifications are identical.

Parameter Comparison

Parameter	SF25G-TP (Micro Commercial Co)	SF25G B0G (Taiwan Semiconductor Corporation)	Match Status
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 2 A	1.3 V @ 2 A	Equivalent
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	35 ns	35 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 300 V	5 µA @ 300 V	Equivalent
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	Substitute (Lower)
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	Substitute (Narrower Range)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Not For New Designs	Active	Substitute (Active)

Engineering Selection Recommendations

SF25G B0G (Taiwan Semiconductor Corporation) is a direct electrical and mechanical substitute for the SF25G-TP. The substitute part maintains all critical electrical parameters: 300V reverse voltage rating, 2A average rectified current, 1.3V forward voltage drop, 35ns reverse recovery time, and 5µA reverse leakage current. Both parts are packaged in DO-204AC/DO-15 axial through-hole configuration and comply with ROHS3 standards.

The SF25G B0G offers the advantage of active product status, ensuring ongoing availability and manufacturer support. The operating temperature range of the substitute part (-55°C to 150°C) is narrower than the original (-65°C to 150°C) at the lower bound; this difference is significant only in applications requiring operation below -55°C. The capacitance specification of the substitute part (20pF) is lower than the original (30pF), which may provide improved high-frequency performance in certain circuit topologies.

Selection between these parts should be based on application temperature requirements and circuit sensitivity to junction capacitance. For applications operating above -55°C, the SF25G B0G provides equivalent functionality with superior product lifecycle status.

Frequently Asked Questions (FAQ)

Q: Can the SF25G B0G replace the SF25G-TP in existing designs?

A: Yes. The SF25G B0G meets all electrical and mechanical specifications of the SF25G-TP. Both parts are rated for 300V reverse voltage, 2A average rectified current, and use identical DO-15 through-hole packaging. Direct substitution is possible in applications operating within the temperature range of -55°C to 150°C.

Q: What is the significance of the "Not For New Designs" status on the SF25G-TP?

A: This designation indicates the SF25G-TP has been discontinued by the manufacturer and is no longer recommended for new product development. The SF25G B0G, with active product status, is the appropriate choice for new designs requiring this electrical specification.

Q: Are there differences in the operating temperature ranges between these parts?

A: Yes. The SF25G-TP operates from -65°C to 150°C, while the SF25G B0G operates from -55°C to 150°C. The substitute part has a narrower lower temperature limit. Applications requiring operation below -55°C must use the original SF25G-TP or identify alternative parts with extended low-temperature ratings.

Q: How do the capacitance specifications differ, and does this affect substitution?

A: The SF25G-TP has a capacitance of 30pF at 4V and 1MHz, while the SF25G B0G has 20pF under the same conditions. The lower capacitance of the substitute part may improve performance in high-frequency switching applications. This difference does not prevent substitution but should be evaluated in circuits sensitive to junction capacitance effects.

Q: Are both parts RoHS compliant?

A: Yes. Both the SF25G-TP and SF25G B0G are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the package designation DO-204AC, and how does it relate to DO-15?

A: DO-204AC is the formal JEDEC package designation for the axial through-hole diode package commonly referred to as DO-15. Both designations describe the same physical package configuration. The SF25G-TP and SF25G B0G use this identical package, ensuring mechanical compatibility in circuit board layouts.

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