SF22-AP Equivalent & Substitute Parts

Part Overview

The SF22-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100V DC reverse voltage and 2A average rectified current in a DO-15 through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The SF22-AP features fast recovery characteristics with a reverse recovery time of 35 nanoseconds and operates across a junction temperature range of -55°C to 125°C.

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	5 µA @ 100 V
Package / Case	DO-204AC, DO-15, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SF22-AP is based on electrical and mechanical parameter equivalence within the general-purpose rectifier diode category. The following parameters establish substitution eligibility:

Critical Electrical Parameters:

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)
Current - Reverse Leakage @ Vr: 5 µA @ 100 V

Mechanical Parameters:

Package / Case: DO-204AC, DO-15, Axial
Mounting Type: Through Hole

Compliance Requirements:

RoHS Status: ROHS3 Compliant

The UG2B-E3/54 meets all critical electrical specifications and mechanical requirements, with identical voltage ratings, current capacity, forward voltage drop, and reverse leakage characteristics. Both components utilize the same DO-15 package format and through-hole mounting configuration.

Parameter Comparison

Parameter	SF22-AP (Main Part)	UG2B-E3/54 (Substitute)
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active
Voltage - DC Reverse (Vr) (Max)	100 V	100 V
Current - Average Rectified (Io)	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 2 A	950 mV @ 2 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	25 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Mounting Type	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 125°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The UG2B-E3/54 is a direct electrical and mechanical equivalent to the SF22-AP. Both components share identical voltage ratings (100V), current capacity (2A), forward voltage characteristics (950 mV @ 2A), and reverse leakage specifications (5 µA @ 100V). The package format and through-hole mounting configuration are identical, enabling direct board-level substitution without layout modifications.

The UG2B-E3/54 offers the advantage of active product status from Vishay General Semiconductor, ensuring ongoing availability and supply chain continuity. The substitute part features a lower reverse recovery time (25 ns versus 35 ns), which represents improved performance characteristics. The extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) provides additional thermal margin for demanding applications.

Both components maintain ROHS3 compliance, satisfying regulatory requirements for new designs and production environments. The UG2B-E3/54 is supplied in Cut Tape (CT) packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the UG2B-E3/54 be used as a direct replacement for the SF22-AP in existing designs?

A: Yes. The UG2B-E3/54 meets all electrical specifications of the SF22-AP, including voltage rating (100V), current capacity (2A), forward voltage drop (950 mV @ 2A), and reverse leakage (5 µA @ 100V). The identical DO-15 package and through-hole mounting configuration enable direct substitution without circuit board modifications.

Q: What are the key differences between these two diodes?

A: The primary differences are manufacturer origin and product status. The SF22-AP is obsolete, while the UG2B-E3/54 is an active product from Vishay. The UG2B-E3/54 features a faster reverse recovery time (25 ns versus 35 ns) and an extended operating temperature range (-55°C to 150°C versus -55°C to 125°C). These differences represent performance improvements rather than incompatibilities.

Q: Are both parts RoHS compliant?

A: Yes. Both the SF22-AP and UG2B-E3/54 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and assembly.

Q: What packaging formats are available for the substitute part?

A: The UG2B-E3/54 is supplied in Cut Tape (CT) packaging, which is standard for automated assembly operations. The component maintains the DO-15 axial package format compatible with through-hole PCB assembly.

Q: Does the faster reverse recovery time of the UG2B-E3/54 affect circuit performance?

A: The UG2B-E3/54 reverse recovery time of 25 ns is faster than the SF22-AP specification of 35 ns. Both values fall within the fast recovery classification (≤ 500ns). The faster recovery time of the substitute part represents equivalent or improved performance in rectification applications and does not introduce compatibility issues.

Q: Are there any temperature-related considerations for substitution?

A: The UG2B-E3/54 operates across a wider junction temperature range (-55°C to 150°C) compared to the SF22-AP (-55°C to 125°C). This extended range provides additional thermal margin and is fully compatible with applications designed for the SF22-AP temperature specifications.

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