SF21G-TP Equivalent & Substitute Parts

Part Overview

The SF21G-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 2A average rectified current in a DO-15 through-hole package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Applications requiring this diode specification must transition to active equivalent parts that maintain electrical and mechanical compatibility while offering current manufacturing support and availability.

Substiute Parts

SF21G-TP

Micro Commercial CoIn Stock: 1025SF21G-TP Datasheet

Current PartRFQ

EGP20A

Fairchild SemiconductorIn Stock: 24889EGP20A Datasheet

Parametric EquivalentRFQ

EGP20A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1135EGP20A-E3/54 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF21G-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 2 A
• Voltage - Forward (Vf) (Max) @ If: 950 mV @ 2 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial
• Operating Temperature - Junction: -65°C ~ 150°C

The substitute parts EGP20A and EGP20A-E3/54 meet all critical electrical parameters and physical package requirements. Both parts are manufactured to the same DO-15 axial through-hole standard and support identical voltage and current ratings. The primary distinction between substitutes is packaging format (Bulk vs. Cut Tape) and manufacturer source, with no impact on electrical performance or board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status Requirement: Both EGP20A and EGP20A-E3/54 are classified as Active products, providing ongoing manufacturing support and supply chain continuity. The SF21G-TP "Not For New Designs" status necessitates transition to one of these equivalents for new applications or redesigns.

For Compliance and Regulatory Requirements: EGP20A-E3/54 provides explicit ROHS3 compliance certification and EAR99 export classification matching the original SF21G-TP specifications. EGP20A compliance status for RoHS and export classification is not specified in available documentation.

For Electrical Performance: All three parts meet the critical 50V/2A rating and fast recovery speed classification. The SF21G-TP exhibits a 35 ns reverse recovery time compared to 50 ns for both substitutes, representing a minor performance difference within the fast recovery category. The SF21G-TP capacitance specification of 60 pF differs from the 70 pF specification of both substitutes, a 10 pF variance that does not affect functional compatibility in standard rectification applications.

For Packaging and Availability: EGP20A is supplied in Bulk packaging with 24,846 pieces in stock. EGP20A-E3/54 is supplied in Cut Tape (CT) packaging with 1,031 pieces in stock. Both maintain the DO-15 axial through-hole package format required for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can EGP20A and EGP20A-E3/54 be used interchangeably with SF21G-TP?

A: Both parts are electrical and mechanical equivalents. They share identical voltage ratings (50V), current ratings (2A), forward voltage characteristics (950 mV @ 2A), and through-hole DO-15 package format. Direct substitution on existing PCBs is supported without circuit modification.

Q: What is the difference between EGP20A and EGP20A-E3/54?

A: The primary difference is packaging format. EGP20A is supplied in Bulk packaging, while EGP20A-E3/54 is supplied in Cut Tape (CT) packaging. Both parts are electrically identical and functionally interchangeable. Selection depends on procurement and assembly process requirements.

Q: Why does the SF21G-TP have a lower reverse recovery time (35 ns) than the substitutes (50 ns)?

A: The SF21G-TP specification of 35 ns is within the fast recovery classification (≤ 500ns, > 200mA). The substitute parts at 50 ns also meet this classification. Both specifications are acceptable for standard rectification applications. The difference does not affect functional compatibility.

Q: Are there compliance differences between the substitute parts?

A: EGP20A-E3/54 provides explicit ROHS3 compliance and EAR99 export classification documentation. EGP20A compliance status for these certifications is not specified in available data. For applications requiring documented ROHS3 compliance, EGP20A-E3/54 is the preferred selection.

Q: What is the capacitance difference between SF21G-TP and the substitutes?

A: SF21G-TP is specified at 60 pF @ 4V, 1MHz, while both EGP20A and EGP20A-E3/54 are specified at 70 pF @ 4V, 1MHz. This 10 pF difference does not affect performance in standard rectification circuits and does not prevent substitution.

Q: Which substitute part should be selected for new designs?

A: Both EGP20A and EGP20A-E3/54 are Active products suitable for new designs. EGP20A-E3/54 is recommended when explicit ROHS3 compliance documentation is required. EGP20A is recommended when bulk packaging and maximum inventory availability are priorities.

Q: Are the DO-15 and DO-204AC package designations equivalent?

A: Yes. DO-15 and DO-204AC refer to the same axial through-hole package standard. Both designations are used interchangeably in industry documentation and represent identical physical and electrical package specifications.