SK56 Schottky Diode 60V 5A Equivalent & Substitute Parts

Part Overview

The SK56 is an active Schottky rectifier diode manufactured by Diotec Semiconductor, rated for 60V DC reverse voltage and 5A average rectified current in a Surface Mount DO-214AA (SMB) package. This component is designed for fast recovery applications with switching speeds ≤500ns at currents >200mA. The SK56 remains in active production with 21,200 units in current inventory.

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements where alternative manufacturers or performance characteristics are acceptable within the defined electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	60	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) Maximum @ If	680 mV @ 5 A	mV @ A
Speed - Fast Recovery	≤500ns, >200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 60 V
Operating Temperature - Junction	-50 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitute parts for the SK56 are classified into two categories based on electrical parameter alignment:

Parametric Equivalent (SK56-3G): This part maintains identical electrical specifications to the SK56, including 60V reverse voltage rating, 5A average rectified current, 680mV forward voltage drop at 5A, and fast recovery characteristics ≤500ns. The SK56-3G is manufactured by Diotec Semiconductor and shares the same DO-214AA (SMB) package. This classification indicates direct functional interchangeability for applications requiring the full 5A current rating.

Functional Substitute (SS26HE3_A/H): This part shares the same 60V reverse voltage rating and DO-214AA (SMB) package but operates at a reduced average rectified current of 2A. The SS26HE3_A/H is manufactured by Vishay General Semiconductor - Diodes Division and includes automotive-grade qualification (AEC-Q101). This classification applies to applications where the 2A current rating is sufficient and automotive compliance is required.

Substitution eligibility is determined by matching the following critical parameters: reverse voltage rating (60V), package type (DO-214AA/SMB), technology (Schottky), and fast recovery speed characteristic (≤500ns, >200mA).

Parameter Comparison

Parameter	SK56 (Main)	SK56-3G (Parametric Equivalent)	SS26HE3_A/H (Functional Substitute)
Manufacturer	Diotec Semiconductor	Diotec Semiconductor	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) Maximum	60 V	60 V	60 V
Current - Average Rectified (Io)	5 A	5 A	2 A
Voltage - Forward (Vf) Maximum @ If	680 mV @ 5 A	680 mV @ 5 A	700 mV @ 2 A
Speed - Fast Recovery	≤500ns, >200mA (Io)	≤500ns, >200mA (Io)	≤500ns, >200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 60 V	200 µA @ 60 V	400 µA @ 60 V
Operating Temperature - Junction	-50 to 150°C	-50 to 150°C	-65 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Technology	Schottky	Schottky	Schottky
Product Status	Active	Active	Active
RoHS Status	Not applicable	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SK56-3G Selection: The SK56-3G is the primary parametric equivalent for direct replacement in applications requiring the full 5A current rating. Both parts are manufactured by Diotec Semiconductor and maintain identical electrical characteristics. The SK56-3G carries ROHS3 compliance status, whereas the SK56 status is not applicable. Current inventory for SK56-3G is 2,990 units.

SS26HE3_A/H Selection: The SS26HE3_A/H is suitable for applications where the average rectified current requirement does not exceed 2A. This part is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance with REACH unaffected status. The SS26HE3_A/H exhibits higher reverse leakage current (400µA versus 200µA) and slightly elevated forward voltage drop (700mV at 2A versus 680mV at 5A). Current inventory for SS26HE3_A/H is 224,950 units. Selection of this part is appropriate for automotive applications or where extended temperature range (-65 to 150°C) is required.

Both substitute parts maintain the DO-214AA (SMB) Surface Mount package, ensuring mechanical and thermal compatibility with existing PCB layouts designed for the SK56.

Frequently Asked Questions (FAQ)

Q: Can the SK56-3G replace the SK56 in all applications?

A: The SK56-3G is a parametric equivalent with identical electrical specifications (60V, 5A, 680mV forward voltage, fast recovery ≤500ns). Direct replacement is appropriate for applications operating within the specified electrical parameters. Physical footprint and thermal characteristics remain unchanged due to identical DO-214AA (SMB) packaging.

Q: Under what conditions is the SS26HE3_A/H suitable as a substitute?

A: The SS26HE3_A/H is suitable when the application current requirement does not exceed 2A. The part maintains 60V reverse voltage rating, fast recovery characteristics, and DO-214AA (SMB) package compatibility. The SS26HE3_A/H is specifically qualified for automotive applications (AEC-Q101) and operates across an extended temperature range (-65 to 150°C).

Q: What is the difference in reverse leakage current between these parts?

A: The SK56 and SK56-3G both exhibit 200µA reverse leakage at 60V. The SS26HE3_A/H exhibits 400µA reverse leakage at 60V. Applications sensitive to leakage current should account for this 2x difference when selecting the Vishay part.

Q: Are all three parts available in the same package?

A: Yes. The SK56, SK56-3G, and SS26HE3_A/H are all supplied in DO-214AA (SMB) Surface Mount packages. PCB layout and thermal management designs are directly compatible across all three parts.

Q: What compliance certifications differ between these parts?

A: The SK56 has not applicable RoHS status. The SK56-3G and SS26HE3_A/H are both ROHS3 compliant. The SS26HE3_A/H carries AEC-Q101 automotive qualification. Applications requiring specific compliance certifications should select accordingly.

Q: How do forward voltage characteristics compare?

A: The SK56 and SK56-3G both specify 680mV maximum forward voltage at 5A. The SS26HE3_A/H specifies 700mV maximum forward voltage at 2A. Forward voltage is measured at the respective rated currents; direct comparison at identical current levels is not provided in the specifications.

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