SF30BG-T Equivalent & Substitute Parts

Part Overview

The SF30BG-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing applications and new designs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the same application category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SF30BG-T is determined by the following critical parameters:

Electrical Specifications:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 3 A minimum
Forward voltage (Vf) within acceptable operating range
Reverse recovery time (trr) and recovery speed classification

Mechanical Specifications:

Mounting Type: Through Hole required
Package / Case: DO-201AD or equivalent axial package
Operating Temperature Range: -65°C to 150°C minimum

Compliance & Status:

RoHS3 Compliance preferred for new designs
Product Status: Active preferred; Not For New Designs acceptable for legacy applications
Moisture Sensitivity Level: 1 (Unlimited) standard

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Functional Alternatives (meeting or exceeding core electrical requirements with compatible packaging).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Speed Classification	trr [ns]	Package	Product Status	RoHS Status
SF30BG-T	Diodes Incorporated	100	3	950 @ 3A	Fast Recovery ≤ 500ns	35	DO-201AD	Obsolete	ROHS3 Compliant
1N5401-G	Comchip Technology	100	3	950 @ 3A	Standard Recovery >500ns	—	DO-201AD	Active	ROHS3 Compliant
1N5186	Microchip Technology	100	3	1500 @ 9A	Fast Recovery ≤ 500ns	150	B, Axial	Active	RoHS non-compliant
1N5401-E3/54	Vishay General Semiconductor - Diodes Division	100	3	1200 @ 3A	Standard Recovery >500ns	—	DO-201AD	Active	ROHS3 Compliant
1N5401G	Good-Ark Semiconductor	100	3	1100 @ 3A	Standard Recovery >500ns	—	DO-201AD	Active	ROHS3 Compliant
1N5401RLG	onsemi	100	3	1000 @ 3A	Standard Recovery >500ns	—	DO-201AA, DO-27, Axial	Not For New Designs	ROHS3 Compliant
1N5416	Microchip Technology	100	3	1500 @ 9A	Fast Recovery ≤ 500ns	150	B, Axial	Active	RoHS non-compliant
1N5804	Solid State Inc.	100	2.5	875 @ 1A	Fast Recovery ≤ 500ns	25	DO-204AP	Active	ROHS3 Compliant
GI501-E3/54	Vishay General Semiconductor - Diodes Division	100	3	1100 @ 9.4A	Standard Recovery >500ns	2000	DO-201AD	Active	ROHS3 Compliant
GI501-E3/73	Vishay General Semiconductor - Diodes Division	100	3	1100 @ 9.4A	Standard Recovery >500ns	2000	DO-201AD	Active	ROHS3 Compliant
MR851G	onsemi	100	3	1250 @ 3A	Fast Recovery ≤ 500ns	300	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs (RoHS3 Compliant, Active Status):

The following parts are recommended as primary substitutes for the obsolete SF30BG-T:

1N5401-E3/54 (Vishay General Semiconductor - Diodes Division) — Active status, ROHS3 compliant, DO-201AD package, 62,000 units in stock. Meets all core electrical specifications with standard recovery speed classification.
1N5401G (Good-Ark Semiconductor) — Active status, ROHS3 compliant, DO-201AD package, 1,346 units in stock. Electrical specifications align with SF30BG-T requirements.
GI501-E3/54 (Vishay General Semiconductor - Diodes Division) — Active status, ROHS3 compliant, DO-201AD package, 6,324 units in stock. Functionally equivalent with standard recovery speed.
MR851G (onsemi) — Active status, ROHS3 compliant, axial package, 3,300 units in stock. Fast recovery speed classification with extended temperature range to 125°C.

For Legacy Applications (Not For New Designs):

1N5401RLG (onsemi) — Not For New Designs status, ROHS3 compliant, 3,600 units in stock. Acceptable for replacement in existing systems.

Alternative Consideration (RoHS Non-Compliant):

1N5186 (Microchip Technology) — Active status, fast recovery speed, extended temperature range to 175°C. RoHS non-compliant; use only where RoHS compliance is not required.
1N5416 (Microchip Technology) — Active status, fast recovery speed, extended temperature range to 175°C. RoHS non-compliant; use only where RoHS compliance is not required.

Current-Reduced Alternative:

1N5804 (Solid State Inc.) — Active status, ROHS3 compliant, 2.5 A rated current. Use only where application current requirement is 2.5 A or lower.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5401-E3/54 as a direct replacement for SF30BG-T?

A: Yes. Both parts are rated for 100 V reverse voltage and 3 A average rectified current in DO-201AD packages. The 1N5401-E3/54 is active and ROHS3 compliant, making it suitable for both legacy and new designs.

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

A: Fast recovery diodes have reverse recovery time ≤ 500 ns and are suitable for high-frequency switching applications. Standard recovery diodes have reverse recovery time > 500 ns and are used in lower-frequency rectification circuits. The SF30BG-T specifies fast recovery (35 ns trr), while most active substitutes use standard recovery classification. Selection depends on circuit switching frequency requirements.

Q: Why is 1N5804 listed as a substitute if it has only 2.5 A rating?

A: The 1N5804 is included as a functional alternative for applications where the maximum current requirement does not exceed 2.5 A. It provides superior fast recovery characteristics (25 ns trr) and ROHS3 compliance. Use only if circuit design permits the lower current rating.

Q: Are the Microchip parts (1N5186, 1N5416) suitable for new designs?

A: Both parts are active and provide fast recovery speed with extended temperature range to 175°C. However, they are RoHS non-compliant. Use only in applications where RoHS compliance is not a requirement. For RoHS-compliant designs, select from the ROHS3-compliant alternatives listed above.

Q: What is the difference between DO-201AD and DO-27 package designations?

A: DO-201AD and DO-27 are equivalent axial through-hole package designations used by different manufacturers. Parts specified with either designation are mechanically and electrically interchangeable in through-hole PCB applications.

Q: Can I use 1N5401RLG in new designs?

A: The 1N5401RLG is classified as "Not For New Designs" by onsemi. It is acceptable for replacement in existing systems and legacy applications but should not be selected for new circuit designs. Use active-status alternatives such as 1N5401-E3/54 or 1N5401G for new designs.

Q: How do I determine which substitute is best for my application?

A: Selection depends on three factors: (1) RoHS compliance requirement — choose ROHS3-compliant parts for regulated applications; (2) Recovery speed requirement — choose fast recovery (≤ 500 ns) for high-frequency switching or standard recovery (> 500 ns) for line-frequency rectification; (3) Current requirement — ensure rated current meets or exceeds circuit maximum current. The 1N5401-E3/54 is the recommended primary choice for most applications due to high inventory availability, active status, and ROHS3 compliance.

Q: What is the significance of the -E3/54 and -E3/73 suffixes on Vishay parts?

A: These suffixes indicate packaging and tape configuration specifications. The -E3/54 designation specifies cut tape packaging, while -E3/73 indicates a different tape configuration. Both GI501-E3/54 and GI501-E3/73 are electrically identical and functionally equivalent; selection depends on procurement and assembly equipment compatibility.

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