SF15G Equivalent & Substitute Parts

Part Overview

The SF15G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 300 V DC reverse voltage and 1 A average rectified current in a through-hole DO-204AL (DO-41) axial package. This component is classified as Active and complies with ROHS3 and REACH standards.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements mandate specific certifications such as automotive qualification (AEC-Q101) or alternative mounting technologies. The SF15G has documented equivalents and similar alternatives that maintain electrical compatibility within defined parameter ranges.

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
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	-
Package / Case	DO-204AL, DO-41, Axial	-
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SF15G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 300 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-204AL, DO-41, Axial
Mounting Type: Through Hole

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.3 V @ 1 A
Reverse Recovery Time (trr): ≤ 35 ns (fast recovery classification)
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 300 V
Operating Temperature - Junction: -55°C to 150°C minimum

Substitute parts are classified into two categories:

Direct Equivalent (SF15GH): Identical electrical specifications and through-hole axial package with automotive-grade qualification (AEC-Q101).

Similar Alternative (MUR130G, NRVA4003T3G): Parts that meet core voltage and current ratings but differ in recovery time, forward voltage, leakage current, package type, or product status. These alternatives require design verification for specific application constraints.

Parameter Comparison

Parameter	SF15G	SF15GH	MUR130G	NRVA4003T3G
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	onsemi	onsemi
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	300 V	300 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.25 V @ 1 A	1.1 V @ 1 A
Reverse Recovery Time (trr)	35 ns	35 ns	75 ns	Not Specified
Current - Reverse Leakage @ Vr	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V	10 µA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery >500ns
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-214AC, SMA
Mounting Type	Through Hole	Through Hole	Through Hole	Surface Mount
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-65 to 175°C	-55 to 150°C
Product Status	Active	Active	Obsolete	Not For New Designs
Automotive Qualification	Standard	AEC-Q101	Not Specified	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	5664 Pcs	6001 Pcs	852 Pcs	62300 Pcs

Engineering Selection Recommendations

SF15GH (Direct Equivalent - Recommended for Automotive Applications)

SF15GH is the primary equivalent to SF15G with identical electrical specifications and through-hole axial packaging. SF15GH carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial applications requiring certified components. Both parts are Active status with comparable inventory availability. Selection of SF15GH is appropriate when automotive-grade reliability is required.

MUR130G (Similar Alternative - Limited Applicability)

MUR130G meets the core voltage and current requirements but exhibits a longer reverse recovery time (75 ns versus 35 ns) and operates across a wider temperature range (-65°C to 175°C). MUR130G is classified as Obsolete, restricting its use to legacy system maintenance or applications where long-term supply is not critical. The extended recovery time may impact switching performance in high-frequency circuits.

NRVA4003T3G (Similar Alternative - Surface Mount Only)

NRVA4003T3G is a surface-mount variant in SMA package with lower forward voltage (1.1 V) and higher reverse leakage current (10 µA). This part is classified as Not For New Designs and is suitable only for retrofit applications or when surface-mount technology is mandatory. The standard recovery classification (>500ns) differs from the fast recovery specification of SF15G.

Selection Criteria Summary:

Through-hole axial package required: Use SF15G or SF15GH
Automotive qualification required: Use SF15GH
Surface-mount package required: Use NRVA4003T3G (with design verification)
Legacy system maintenance: MUR130G acceptable with recovery time analysis

Frequently Asked Questions (FAQ)

Q: Can SF15GH be used as a direct replacement for SF15G?

A: Yes. SF15GH is electrically and mechanically equivalent to SF15G with identical voltage, current, and recovery specifications. Both use the same DO-204AL through-hole axial package. SF15GH includes AEC-Q101 automotive qualification, which SF15G does not specify.

Q: What is the primary difference between SF15G and MUR130G?

A: Both parts share 300 V reverse voltage and 1 A current ratings in through-hole axial packages. MUR130G has a longer reverse recovery time (75 ns versus 35 ns), operates at higher junction temperatures (-65°C to 175°C versus -55°C to 150°C), and is classified as Obsolete. The extended recovery time may affect performance in switching applications.

Q: Why is NRVA4003T3G listed as a substitute if it uses a different package?

A: NRVA4003T3G maintains the same voltage and current ratings as SF15G but in a surface-mount SMA package. It is listed as a similar alternative for applications where surface-mount technology is required or preferred. Direct board-level substitution is not possible without circuit redesign.

Q: Can MUR130G be used in new designs?

A: No. MUR130G is classified as Obsolete and is not recommended for new designs. It is suitable only for maintenance of existing systems or legacy applications where long-term supply continuity is not required.

Q: Is NRVA4003T3G suitable for new designs?

A: NRVA4003T3G is classified as Not For New Designs. It is restricted to retrofit or replacement applications in existing systems. New designs should use SF15G, SF15GH, or other active-status alternatives.

Q: What is the significance of AEC-Q101 qualification on SF15GH?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. SF15GH carries this certification, indicating compliance with automotive reliability and quality requirements. SF15G does not specify this qualification. Selection of SF15GH is mandatory for automotive applications requiring certified components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SF15G, SF15GH, MUR130G, and NRVA4003T3G are all ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What is the difference between fast recovery and standard recovery classifications?

A: Fast recovery diodes (SF15G, SF15GH, MUR130G) have reverse recovery times ≤ 500 ns and are optimized for switching applications. Standard recovery diodes (NRVA4003T3G) have reverse recovery times > 500 ns and are suitable for general-purpose rectification. Fast recovery classification is preferred for high-frequency switching circuits.

Q: Can SF15G be replaced with NRVA4003T3G in a through-hole circuit?

A: No. NRVA4003T3G is a surface-mount component in SMA package, while SF15G is through-hole axial. Direct board-level substitution is not possible. Circuit redesign and PCB layout modification would be required.

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