SDURF1040CT Equivalent & Substitute Parts

Part Overview

The SDURF1040CT is a general-purpose diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode rectifier with a maximum reverse voltage rating of 400 V. The device is packaged in a TO-220-3 Full Pack with isolated tab for through-hole mounting applications. This component is classified as Active product status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	400 V
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 5 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	45 ns
Current - Reverse Leakage @ Vr	30 µA @ 400 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack, Isolated Tab
Supplier Device Package	ITO-220AB
Technology	Standard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SDURF1040CT is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 5 A
Reverse Recovery Time (trr): 45 ns
Current - Reverse Leakage @ Vr: 30 µA @ 400 V
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: -55°C ~ 150°C

Mechanical Parameters:

Diode Configuration: 1 Pair Common Cathode
Package / Case: TO-220-3 Full Pack, Isolated Tab
Supplier Device Package: ITO-220AB
Mounting Type: Through Hole
Technology: Standard

Substitute parts must maintain identical values across all listed parameters to ensure functional and physical compatibility within the original circuit design.

Parameter Comparison

Parameter	SDURF1040CT (SMC Diode Solutions)	DURF1040CT (Littelfuse Inc.)
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max)	400 V	400 V
Current - Average Rectified (Io) (per Diode)	Not specified	5A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 5 A	1.3 V @ 5 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	45 ns	45 ns
Current - Reverse Leakage @ Vr	30 µA @ 400 V	30 µA @ 400 V
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab
Supplier Device Package	ITO-220AB	ITO-220AB
Technology	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active

Engineering Selection Recommendations

The DURF1040CT manufactured by Littelfuse Inc. is a direct parametric equivalent to the SDURF1040CT. Both components maintain identical electrical specifications across voltage ratings, forward voltage characteristics, recovery time parameters, and leakage current specifications. Both devices are packaged identically in TO-220-3 Full Pack with isolated tab configuration and support through-hole mounting.

Both the SDURF1040CT and DURF1040CT are Active product status components and maintain ROHS3 compliance, confirming current manufacturing support and regulatory alignment. The DURF1040CT explicitly specifies an average rectified current rating of 5A per diode, which aligns with the forward voltage test condition of 1.3 V @ 5 A common to both parts.

Selection between these equivalent parts may be based on inventory availability, supplier lead time, or procurement requirements, as electrical and mechanical performance characteristics are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the DURF1040CT replace the SDURF1040CT in existing circuit designs?

A: Yes. The DURF1040CT is a parametric equivalent with identical electrical specifications including 400 V reverse voltage rating, 1.3 V forward voltage at 5 A, 45 ns reverse recovery time, and 30 µA reverse leakage current. Both components share the same TO-220-3 Full Pack, Isolated Tab package configuration and through-hole mounting type.

Q: Are there differences in compliance or regulatory status between these parts?

A: Both the SDURF1040CT and DURF1040CT are ROHS3 compliant and maintain Active product status. The SDURF1040CT is REACH Affected, while the DURF1040CT is REACH Unaffected. Both components carry EAR99 ECCN classification and identical HTSUS code 8541.10.0080.

Q: What is the significance of the "1 Pair Common Cathode" configuration?

A: This configuration indicates the diode array contains two diodes with a shared cathode terminal. The TO-220-3 package provides three leads: two anodes and one common cathode. This configuration is maintained identically in both the SDURF1040CT and DURF1040CT.

Q: Are the operating temperature ranges identical?

A: Yes. Both components operate across a junction temperature range of -55°C to 150°C, ensuring equivalent thermal performance characteristics across the specified operating environment.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" indicate?

A: This specification classifies the diode as a fast recovery rectifier with reverse recovery time not exceeding 500 nanoseconds at reverse currents greater than 200 milliamps. Both the SDURF1040CT and DURF1040CT meet this classification with a measured reverse recovery time of 45 ns.

Q: Is the isolated tab feature important for substitution?

A: Yes. The isolated tab in the TO-220-3 Full Pack, Isolated Tab package electrically isolates the mounting tab from the diode terminals, preventing unintended electrical connections. Both substitute parts maintain this feature, ensuring mechanical and electrical compatibility in applications requiring isolated mounting.

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