SF10FG-T Equivalent & Substitute Parts

Part Overview

The SF10FG-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 300 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 axial package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within the specified voltage, current, and thermal operating ranges while accommodating package and mounting compatibility requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	10	µA @ 300 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF10FG-T is determined by equivalence across the following critical electrical and mechanical parameters:

Voltage Rating: Substitute parts must maintain a DC reverse voltage rating (Vr) of 300 V or greater to ensure safe operation in the original circuit application.

Current Rating: Average rectified current (Io) must be rated at 1 A or higher to support the design load without thermal stress.

Forward Voltage Drop: Forward voltage (Vf) at 1 A must not exceed the original specification to prevent excessive power dissipation and thermal effects in the circuit.

Recovery Characteristics: Fast recovery classification (≤ 500 ns for currents > 200 mA) ensures compatibility with switching applications and prevents reverse recovery transients that could damage circuit components.

Package and Mounting: Through-hole axial packages (DO-41, DO-204AL) are required for mechanical and electrical compatibility with existing printed circuit board layouts.

Temperature Range: Operating junction temperature range must encompass the original -65°C to 150°C specification or extend it without reducing the lower or upper limits below the original range.

Compliance: RoHS3 compliance is mandatory for regulatory and supply chain continuity.

Parameter Comparison

Parameter	SF10FG-T (Diodes Inc.)	MUR130G (onsemi)	Compatibility
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.25 V @ 1 A	Substitute Superior
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Equivalent
Reverse Recovery Time (trr)	40 ns	75 ns	Substitute Acceptable
Current - Reverse Leakage @ Vr	10 µA @ 300 V	5 µA @ 300 V	Substitute Superior
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Equivalent
Operating Temperature - Junction	-65 to 150°C	-65 to 175°C	Substitute Superior
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

MUR130G (onsemi) - Primary Substitute

The MUR130G is a direct functional equivalent to the SF10FG-T with superior electrical characteristics across multiple parameters. Both components are classified as obsolete, indicating end-of-life status from their respective manufacturers. The MUR130G maintains identical voltage and current ratings while demonstrating lower forward voltage drop (1.25 V versus 1.3 V) and reduced reverse leakage current (5 µA versus 10 µA). The extended operating temperature range (-65°C to 175°C versus -65°C to 150°C) provides additional thermal margin for demanding applications. Both parts are ROHS3 compliant and share identical package configurations (DO-41 axial through-hole), ensuring direct mechanical and electrical substitution without circuit board redesign. The MUR130G is available in current inventory (852 pcs) and is suitable for immediate procurement.

Compliance and Regulatory Status

Both the SF10FG-T and MUR130G are ROHS3 compliant and carry EAR99 export classification. The MUR130G is REACH unaffected, while the SF10FG-T is REACH affected. For applications subject to REACH compliance requirements, the MUR130G provides regulatory advantage. Moisture sensitivity level (MSL) is 1 (unlimited) for both components, indicating no special storage or handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the MUR130G directly replace the SF10FG-T without circuit modifications?

A: Yes. The MUR130G is electrically and mechanically equivalent to the SF10FG-T. Both components share identical voltage ratings (300 V), current ratings (1 A), fast recovery characteristics, and through-hole axial package configurations. Direct substitution is supported without circuit board redesign or component layout changes.

Q: What is the significance of the lower forward voltage drop in the MUR130G?

A: The MUR130G exhibits a forward voltage drop of 1.25 V at 1 A compared to 1.3 V for the SF10FG-T. This 0.05 V reduction results in lower power dissipation and reduced thermal generation during forward conduction. In applications with tight thermal budgets or high-frequency switching, this improvement enhances overall circuit efficiency and component reliability.

Q: How does the reverse recovery time difference affect circuit performance?

A: The SF10FG-T specifies a reverse recovery time (trr) of 40 ns, while the MUR130G specifies 75 ns. Both components meet the fast recovery classification (≤ 500 ns for currents > 200 mA). The longer recovery time in the MUR130G is acceptable for general-purpose rectification applications. In high-frequency switching circuits where reverse recovery transients are critical, the SF10FG-T's faster recovery may provide marginal advantage, but the MUR130G remains suitable for standard switching power supply and converter applications.

Q: Are there package compatibility concerns when substituting the MUR130G?

A: No. Both the SF10FG-T and MUR130G are supplied in DO-41 axial through-hole packages with identical mechanical dimensions and lead spacing. The components are directly interchangeable on existing printed circuit boards without modification to component footprints, lead holes, or mounting hardware.

Q: Why is the MUR130G's extended temperature range beneficial?

A: The MUR130G operates across a junction temperature range of -65°C to 175°C, compared to -65°C to 150°C for the SF10FG-T. The additional 25°C upper temperature margin provides enhanced reliability in applications subject to elevated ambient temperatures, thermal cycling, or proximity to high-power components. This extended range is particularly valuable in industrial and automotive environments where thermal stress is a design consideration.

Q: What is the inventory status for the MUR130G?

A: The MUR130G is available with 852 pieces in current new original stock, providing immediate procurement availability. The SF10FG-T, classified as obsolete, has 879 pieces in inventory but is no longer manufactured.

Q: Are both components RoHS compliant?

A: Yes. Both the SF10FG-T and MUR130G are ROHS3 compliant, meeting environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions. The MUR130G carries REACH unaffected status, while the SF10FG-T is REACH affected. For applications requiring REACH compliance documentation, the MUR130G is the preferred selection.

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