SF11-AP Equivalent & Substitute Parts

Part Overview

The SF11-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SF11-AP features fast recovery characteristics with a reverse recovery time of 35 ns and operates across a junction temperature range of -55°C to 125°C. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the through-hole axial package format.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SF11-AP are selected based on strict electrical and mechanical parameter matching within the allowed specifications for general-purpose rectifier diodes. The substitution criteria are:

Primary Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent
Technology: Standard rectifier diode

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): Fast recovery classification (≤ 500 ns, > 200 mA)
Current - Reverse Leakage @ Vr: 5 µA @ 50 V maximum
Operating Temperature Range: Minimum -55°C to 125°C
RoHS Status: ROHS3 Compliant

Substitute parts identified below meet or exceed these electrical and mechanical requirements, ensuring functional interchangeability in applications designed for the SF11-AP.

Parameter Comparison

Parameter	SF11-AP (Main)	FR101G A0G	HER101G R1G
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1.3 V @ 1 A	1 V @ 1 A
Reverse Recovery Time (trr)	35 ns	150 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55 to 125°C	-55 to 150°C	-55 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FR101G A0G (Taiwan Semiconductor Corporation)

The FR101G A0G is an active product offering full electrical compatibility with the obsolete SF11-AP. Both devices share identical voltage and current ratings (50 V, 1 A) and are housed in equivalent through-hole DO-204AL/DO-41 axial packages. The FR101G A0G maintains ROHS3 compliance and unlimited moisture sensitivity rating. The forward voltage specification of 1.3 V @ 1 A is higher than the SF11-AP (950 mV), and the reverse recovery time of 150 ns exceeds the SF11-AP specification of 35 ns. The extended operating temperature range (-55°C to 150°C) provides additional thermal margin. This part is suitable for direct substitution in applications where the higher forward voltage drop and longer recovery time are acceptable within circuit design tolerances.

HER101G R1G (Taiwan Semiconductor Corporation)

The HER101G R1G is an active product providing electrical and mechanical compatibility with the SF11-AP. Both devices are rated for 50 V reverse voltage and 1 A average rectified current in through-hole DO-204AL/DO-41 axial packages. The HER101G R1G demonstrates superior performance characteristics relative to the FR101G A0G, with a forward voltage of 1 V @ 1 A and a reverse recovery time of 50 ns, both closer to the SF11-AP specifications. ROHS3 compliance and unlimited moisture sensitivity are maintained. The extended operating temperature range (-55°C to 150°C) exceeds the SF11-AP specification. This part is recommended for applications requiring performance characteristics more closely aligned with the original SF11-AP design.

Frequently Asked Questions (FAQ)

Q: Can the FR101G A0G and HER101G R1G be used interchangeably with the SF11-AP?

A: Both substitute parts meet the primary electrical requirements (50 V reverse voltage, 1 A average rectified current) and package specifications (through-hole DO-41/DO-204AL axial). However, differences in forward voltage and reverse recovery time exist. The HER101G R1G exhibits performance characteristics more closely aligned with the SF11-AP. Circuit-level analysis is required to confirm acceptability of the FR101G A0G's higher forward voltage drop in specific applications.

Q: What is the significance of the reverse recovery time difference between the SF11-AP (35 ns) and the substitute parts?

A: Reverse recovery time affects switching speed and switching losses in rectifier applications. The SF11-AP specifies 35 ns, while the HER101G R1G specifies 50 ns and the FR101G A0G specifies 150 ns. In high-frequency switching applications, the longer recovery times of the substitute parts may result in increased switching losses. Applications operating at lower frequencies or with relaxed switching speed requirements are unaffected by this parameter difference.

Q: Are the substitute parts available in the same physical package as the SF11-AP?

A: Yes. The SF11-AP, FR101G A0G, and HER101G R1G are all housed in through-hole DO-204AL/DO-41 axial packages. Physical dimensions and lead spacing are compatible, allowing direct mechanical substitution on printed circuit boards designed for the SF11-AP.

Q: What is the impact of the forward voltage difference on circuit performance?

A: The SF11-AP specifies a maximum forward voltage of 950 mV @ 1 A, while the HER101G R1G specifies 1 V @ 1 A and the FR101G A0G specifies 1.3 V @ 1 A. In rectifier circuits, forward voltage drop directly affects output voltage and power dissipation. The higher forward voltage of the FR101G A0G results in greater voltage drop and heat generation. Circuit designs with tight voltage regulation requirements or thermal constraints should prioritize the HER101G R1G to minimize performance deviation from the original SF11-AP design.

Q: Do the substitute parts maintain RoHS compliance?

A: Yes. Both the FR101G A0G and HER101G R1G are ROHS3 compliant, matching the compliance status of the SF11-AP. Both substitute parts are also rated MSL 1 (Unlimited), indicating no moisture sensitivity limitations during storage and handling.

Q: What is the advantage of the extended operating temperature range in the substitute parts?

A: The SF11-AP operates across a junction temperature range of -55°C to 125°C, while both substitute parts extend this range to -55°C to 150°C. The extended upper temperature limit provides additional thermal margin in applications operating near the maximum junction temperature specification, reducing the risk of thermal stress and extending component reliability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message