SF61-AP Equivalent & Substitute Parts

Part Overview

The SF61-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 6 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity. The SF61-AP features fast recovery characteristics with a reverse recovery time of 35 ns, suitable for applications requiring efficient switching performance at moderate current levels.

Substiute Parts

SF61-AP

Micro Commercial CoIn Stock: 893SF61-AP Datasheet

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EGP31A-E3/D

Vishay General Semiconductor - Diodes DivisionIn Stock: 1045EGP31A-E3/D Datasheet

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GP30A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 934GP30A-E3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF61-AP is determined by strict alignment of electrical and mechanical parameters within the rectifier diode category. The primary substitution criteria are:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 50 V minimum
• Package / Case: DO-201AD, Axial (physical and electrical compatibility)
• Mounting Type: Through Hole
• RoHS Compliance: ROHS3 Compliant

Current Rating Consideration: The SF61-AP is rated for 6 A average rectified current. Substitute parts with lower current ratings (3 A) are listed as available alternatives but represent a reduction in current-handling capacity. These substitutes are suitable only for applications where the actual circuit current demand does not exceed the substitute part's rating.

Recovery Characteristics: The SF61-AP features fast recovery (≤500 ns, >200 mA) with a reverse recovery time of 35 ns. Substitute parts may exhibit different recovery speeds; this parameter must be evaluated against circuit switching frequency and efficiency requirements.

Temperature Range: The SF61-AP operates from -65°C to 125°C. Substitute parts with extended temperature ranges (to 175°C) provide additional thermal margin but are not required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

EGP31A-E3/D (Vishay): This substitute maintains the 50 V reverse voltage rating and fast recovery characteristics (50 ns trr) of the SF61-AP. However, the current rating is reduced to 3 A, representing a 50% decrease in average rectified current capacity. The EGP31A-E3/D is classified as active product status with extended operating temperature range (-65 to 175°C) and ROHS3 compliance. Selection of this part is appropriate only for circuits where the maximum current demand does not exceed 3 A. The forward voltage at 3 A (950 mV) is comparable to the SF61-AP at its rated current.

GP30A-E3/54 (Vishay): This substitute also maintains the 50 V reverse voltage rating and DO-201AD package compatibility. The current rating is 3 A, identical to the EGP31A-E3/D. However, the GP30A-E3/54 exhibits standard recovery characteristics (5 µs trr) rather than fast recovery, resulting in slower switching performance. The forward voltage is higher at 1.2 V @ 3 A. This part is active product status with ROHS3 compliance and extended temperature range. Selection is appropriate for low-frequency applications where switching speed is not a critical performance factor and current demand does not exceed 3 A.

Both substitute parts are active products with current manufacturing support, ensuring long-term availability compared to the obsolete SF61-AP.

Frequently Asked Questions (FAQ)

Q: Can the EGP31A-E3/D or GP30A-E3/54 be used as direct replacements for the SF61-AP in all applications?

A: Direct replacement is possible only if the circuit current demand does not exceed 3 A. Both substitutes are rated for 3 A average rectified current, compared to the SF61-AP's 6 A rating. If the application requires the full 6 A capacity, neither substitute is suitable without circuit redesign.

Q: What is the difference between fast recovery and standard recovery in these diodes?

A: The SF61-AP and EGP31A-E3/D feature fast recovery with reverse recovery times of 35 ns and 50 ns respectively. The GP30A-E3/54 has standard recovery with a 5 µs reverse recovery time. Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency circuits where switching speed is not critical.

Q: Are the substitute parts physically compatible with the SF61-AP?

A: Yes. All three parts use the DO-201AD axial through-hole package, ensuring identical physical dimensions and PCB mounting compatibility. No board redesign is required for package substitution.

Q: What is the impact of the forward voltage difference between these parts?

A: The SF61-AP has a forward voltage of 975 mV @ 6 A. The EGP31A-E3/D is 950 mV @ 3 A, and the GP30A-E3/54 is 1.2 V @ 3 A. Forward voltage differences affect power dissipation and heat generation. The GP30A-E3/54's higher forward voltage results in greater power loss. Circuits sensitive to voltage drop or thermal performance should account for these differences.

Q: Are all parts RoHS compliant?

A: Yes. The SF61-AP, EGP31A-E3/D, and GP30A-E3/54 are all ROHS3 compliant, meeting environmental and regulatory requirements for lead-free manufacturing.

Q: What is the significance of product status (Obsolete vs. Active)?

A: The SF61-AP is obsolete, meaning Micro Commercial Co no longer manufactures or supports this part. The EGP31A-E3/D and GP30A-E3/54 are active products with ongoing manufacturing and supplier support, ensuring availability for future production and maintenance needs.

Q: Can I use a substitute part with a higher temperature rating in a standard application?

A: Yes. The substitute parts operate from -65 to 175°C, compared to the SF61-AP's -65 to 125°C range. Extended temperature capability does not negatively affect performance in standard applications and provides additional thermal margin for demanding environments.