SF20BG-T Equivalent & Substitute Parts

Part Overview

The SF20BG-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 100 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SF20BG-T employs standard diode technology with fast recovery characteristics suitable for general rectification applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 2 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 100 V
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SF20BG-T is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Through Hole
Package compatibility: DO-15 or equivalent axial package form factor

Secondary Compatibility Factors:

Forward voltage drop (Vf) at rated current
Reverse recovery time (trr) for switching performance
Reverse leakage current characteristics
Operating temperature range overlap
RoHS and REACH compliance status

Substitute parts are grouped into two categories based on package type: DO-15 axial packages (direct mechanical replacement) and SOD-57 axial packages (electrical equivalent with different form factor). Parts with voltage ratings exceeding 100 V are listed for applications requiring higher voltage margin but remain electrically compatible at 100 V operation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Product Status
SF20BG-T	Diodes Incorporated	100 V	2 A	950 mV @ 2 A	35	10 µA @ 100 V	DO-15	Obsolete
BYV27-100-TAP	Vishay General Semiconductor	100 V	2 A	1.07 V @ 3 A	25	1 µA @ 100 V	SOD-57	Active
BYV27-100-TR	Vishay General Semiconductor	100 V	2 A	1.07 V @ 3 A	25	1 µA @ 100 V	SOD-57	Active
FR202GP-AP	Micro Commercial Co	100 V	2 A	1.3 V @ 2 A	150	5 µA @ 100 V	DO-15	Active
FR207GP-AP	Micro Commercial Co	1000 V	2 A	1.3 V @ 2 A	500	5 µA @ 1000 V	DO-15	Active
FR207GP-TP	Micro Commercial Co	1000 V	2 A	1.3 V @ 2 A	500	5 µA @ 1000 V	DO-15	Active
MUR210G	onsemi	100 V	2 A	940 mV @ 2 A	30	2 µA @ 100 V	DO-41	Obsolete
MUR210RLG	onsemi	100 V	2 A	940 mV @ 2 A	30	2 µA @ 100 V	DO-41	Active
SBYV27-100-E3/54	Vishay General Semiconductor	100 V	2 A	1.07 V @ 3 A	15	5 µA @ 100 V	DO-15	Active
SBYV27-100-E3/73	Vishay General Semiconductor	100 V	2 A	1.07 V @ 3 A	15	5 µA @ 100 V	DO-15	Active
UG2B-E3/54	Vishay General Semiconductor	100 V	2 A	950 mV @ 2 A	25	5 µA @ 100 V	DO-15	Active

Engineering Selection Recommendations

Direct Package Replacement (DO-15 Axial):

For applications requiring mechanical and electrical compatibility with the original SF20BG-T form factor, the following active-status parts provide direct substitution:

SBYV27-100-E3/54 and SBYV27-100-E3/73: Both rated 100 V, 2 A in DO-15 package with active product status. These parts feature superior reverse recovery time (15 ns) compared to the original SF20BG-T (35 ns), resulting in improved switching performance. Both are ROHS3 compliant and REACH unaffected.
UG2B-E3/54: Rated 100 V, 2 A in DO-15 package with active product status. Forward voltage (950 mV @ 2 A) closely matches the SF20BG-T specification. Reverse recovery time of 25 ns provides moderate switching performance improvement. ROHS3 compliant and REACH unaffected.
FR202GP-AP: Rated 100 V, 2 A in DO-15 package with active product status. This part exhibits higher forward voltage (1.3 V @ 2 A) and longer reverse recovery time (150 ns) than the SF20BG-T, suitable for applications where switching speed is not critical. ROHS3 compliant and REACH unaffected.

Alternative Package Form Factor (SOD-57 Axial):

For applications where package form factor flexibility exists:

BYV27-100-TAP and BYV27-100-TR: Both rated 100 V, 2 A in SOD-57 package with active product status. These avalanche diodes feature fast recovery characteristics (25 ns) and low reverse leakage (1 µA @ 100 V). BYV27-100-TR offers significantly higher inventory availability (21,905 pcs). Both are ROHS3 compliant and REACH unaffected.

Higher Voltage Margin (DO-15 Axial):

FR207GP-AP and FR207GP-TP: Both rated 1000 V, 2 A in DO-15 package with active product status. These parts provide 10× voltage margin over the SF20BG-T specification, suitable for applications requiring enhanced overvoltage protection. FR207GP-TP offers higher inventory (5,200 pcs). Both are ROHS3 compliant and REACH unaffected.

Axial Package Alternative (DO-41):

MUR210RLG: Rated 100 V, 2 A in DO-41 axial package with active product status. Forward voltage (940 mV @ 2 A) and reverse recovery time (30 ns) closely match the SF20BG-T. This part is ROHS3 compliant and REACH unaffected, with 3,015 pcs in stock.

All recommended substitutes meet ROHS3 compliance and maintain compatibility with the electrical specifications of the SF20BG-T within their respective package constraints.

Frequently Asked Questions (FAQ)

Q: Can SBYV27-100-E3/54 directly replace SF20BG-T in existing PCB designs?

A: Yes. Both parts are rated 100 V, 2 A and use the DO-15 axial through-hole package. The SBYV27-100-E3/54 features improved reverse recovery time (15 ns versus 35 ns), which enhances switching performance without degrading circuit operation. Pin-to-pin compatibility is maintained.

Q: What is the difference between BYV27-100-TAP and BYV27-100-TR?

A: Both parts are electrically identical, rated 100 V, 2 A with SOD-57 package. The difference is packaging format: BYV27-100-TAP is supplied in cut tape, while BYV27-100-TR is supplied in tape and reel. BYV27-100-TR has significantly higher inventory availability (21,905 pcs versus 1,119 pcs).

Q: Why do FR207GP-AP and FR207GP-TP have 1000 V ratings when the SF20BG-T is only 100 V?

A: The FR207 series is rated for 1000 V maximum reverse voltage, which exceeds the SF20BG-T specification. These parts are electrically compatible at 100 V operation and provide additional voltage margin for applications requiring overvoltage protection. The higher voltage rating does not affect performance in 100 V circuits.

Q: Is MUR210RLG a suitable replacement despite using DO-41 package instead of DO-15?

A: MUR210RLG is electrically equivalent to SF20BG-T (100 V, 2 A, fast recovery) but uses DO-41 axial package instead of DO-15. Physical dimensions differ, so PCB layout modification is required. The part is suitable only if board redesign is acceptable.

Q: What is the significance of reverse recovery time differences among substitute parts?

A: Reverse recovery time (trr) determines how quickly the diode transitions from conducting to blocking state. The SF20BG-T has 35 ns trr. Substitutes with lower trr values (SBYV27-100-E3/54 at 15 ns, UG2B-E3/54 at 25 ns) provide faster switching, reducing switching losses in high-frequency applications. Parts with higher trr (FR202GP-AP at 150 ns, FR207 series at 500 ns) are suitable for lower-frequency applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the SF20BG-T.

Q: Which substitute offers the best inventory availability?

A: BYV27-100-TR offers the highest inventory with 21,905 pcs in stock, followed by SBYV27-100-E3/54 with 8,847 pcs. Both are active-status products suitable for long-term supply continuity.

Q: Can FR202GP-AP be used in high-speed switching applications?

A: FR202GP-AP has a reverse recovery time of 150 ns, which is significantly longer than the SF20BG-T (35 ns). This part is not recommended for high-speed switching applications where fast recovery is critical. SBYV27-100-E3/54 or UG2B-E3/54 are better choices for such applications.

Q: What is the difference between SBYV27-100-E3/54 and SBYV27-100-E3/73?

A: Both parts are electrically identical, rated 100 V, 2 A with DO-15 package and 15 ns reverse recovery time. The difference is packaging format: SBYV27-100-E3/54 is supplied in cut tape, while SBYV27-100-E3/73 is supplied in bulk. SBYV27-100-E3/54 has higher inventory (8,847 pcs versus 1,007 pcs).

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