SF56-AP Equivalent & Substitute Parts

Part Overview

The SF56-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 5 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified parameter ranges while offering current product availability and active manufacturer support.

Substiute Parts

SF56-AP

Micro Commercial CoIn Stock: 796SF56-AP Datasheet

Current PartRFQ

SF56G-AP

Micro Commercial CoIn Stock: 887SF56G-AP Datasheet

DirectRFQ

UF504IG_AY_00001

Panjit International Inc.In Stock: 870UF504IG_AY_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SF56-AP are classified based on strict electrical and mechanical parameter alignment within the rectifier diode category. Substitution eligibility requires:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 5 A
• Package / Case: DO-201AD, Axial
• Mounting Type: Through Hole
• Technology: Standard

Secondary Compatibility Parameters:

• Voltage - Forward (Vf) (Max) @ If: ≤ 1.27 V @ 5 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): ≤ 50 ns
• Current - Reverse Leakage @ Vr: ≤ 5 µA @ 400 V
• Operating Temperature - Junction: -55°C minimum, 150°C maximum

Parts meeting all primary criteria and falling within secondary parameter tolerances are classified as direct equivalents or parametric equivalents. Packaging format (Tape & Box vs. bulk) does not affect electrical substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

SF56G-AP (Direct Equivalent - Recommended Primary Substitute)

The SF56G-AP is the preferred substitute for the obsolete SF56-AP. Both components share identical base product designation (SF56) and are manufactured by Micro Commercial Co. The SF56G-AP maintains all critical electrical parameters within specification, with forward voltage differing by only 0.02 V (1.27 V vs. 1.25 V), which is within typical manufacturing tolerance. The SF56G-AP holds active product status with 839 units in stock, ensuring supply chain continuity. Operating temperature range extends to -65°C, providing enhanced low-temperature performance. RoHS3 compliance and MSL 1 rating match the original component. Packaging is available in Tape & Box format, suitable for automated assembly processes.

UF504IG_AY_00001 (Parametric Equivalent - Secondary Substitute)

The UF504IG_AY_00001 manufactured by Panjit International Inc. qualifies as a parametric equivalent, meeting all primary electrical specifications for 400 V, 5 A operation in DO-201AD package. This component exhibits superior reverse leakage characteristics (1 µA vs. 5 µA), reducing standby power dissipation. Reverse recovery time of 50 ns remains within fast-recovery classification. The UF504IG_AY_00001 is active with 833 units available and carries ROHS3 compliance and REACH Unaffected status. Selection of this substitute is appropriate when lower reverse leakage is a design requirement or when Panjit supply chain preference is established.

Product Status Consideration

Both substitute parts hold active product status, eliminating obsolescence risk associated with the SF56-AP. Direct substitution in existing designs requires no circuit modification, as all mechanical and electrical parameters remain compatible.

Frequently Asked Questions (FAQ)

Q: Can SF56G-AP directly replace SF56-AP without circuit modification?

A: Yes. The SF56G-AP maintains identical voltage rating (400 V), current rating (5 A), package type (DO-201AD), and mounting configuration (through-hole axial). Forward voltage variance of 0.02 V is within standard rectifier diode tolerance and does not require circuit redesign.

Q: What is the difference between "Direct Equivalent" and "Parametric Equivalent" classification?

A: Direct equivalents share the same base product number and manufacturer, with specifications matching within manufacturing tolerance. Parametric equivalents meet all critical electrical and mechanical requirements but originate from different manufacturers. Both are electrically interchangeable in the specified application.

Q: Does packaging format (Tape & Box vs. bulk) affect substitution eligibility?

A: No. Packaging format affects supply chain logistics and assembly process compatibility but does not alter electrical substitution eligibility. Both SF56G-AP and UF504IG_AY_00001 are available in Tape & Box format suitable for automated placement equipment.

Q: Why does UF504IG_AY_00001 show reverse recovery time of 50 ns versus 35 ns for the main part?

A: Both components meet fast-recovery classification (≤ 500 ns for > 200 mA). The 15 ns difference falls within acceptable parametric variation for this diode category and does not impact circuit performance in standard rectification applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SF56G-AP and UF504IG_AY_00001 both carry ROHS3 Compliant certification, matching the original SF56-AP specification.

Q: What is the operating temperature range for each substitute?

A: SF56-AP and UF504IG_AY_00001 operate from -55°C to 150°C junction temperature. SF56G-AP extends the lower limit to -65°C, providing enhanced cold-temperature performance without upper-temperature restriction.

Q: Can these diodes be used in high-frequency switching applications?

A: All three components are classified as fast-recovery diodes with reverse recovery time ≤ 500 ns, suitable for switching frequencies up to several hundred kilohertz in standard rectification and freewheeling applications.