SDURF2040CT Equivalent & Substitute Parts

Part Overview

The SDURF2040CT is a general-purpose diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode rectifier with 400 V reverse voltage rating. This component is packaged in a TO-220-3 Full Pack with isolated tab configuration for through-hole mounting applications. The device is classified as Active product status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in circuit designs without functional degradation. Substitution becomes necessary due to inventory availability, supply chain considerations, or manufacturing discontinuation of specific variants.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Voltage - DC Reverse (Vr) (Max)	400	V
Voltage - Forward (Vf) (Max) @ If	1.3 @ 10 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	45	ns
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack, Isolated Tab	—
Supplier Device Package	ITO-220AB	—

Substitute Part Grouping Explanation

Substitution eligibility for the SDURF2040CT is determined by strict alignment of the following critical parameters:

Electrical Parameters:

Diode Configuration: 1 Pair Common Cathode (identical topology required)
Voltage - DC Reverse (Vr) (Max): 400 V (minimum threshold)
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 10 A (forward drop specification)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (switching performance)
Reverse Recovery Time (trr): 45 ns (transient response)
Operating Temperature - Junction: -55°C to 150°C (thermal operating range)

Mechanical Parameters:

Mounting Type: Through Hole (PCB interface requirement)
Package / Case: TO-220-3 Full Pack, Isolated Tab (physical form factor)
Supplier Device Package: ITO-220AB (standardized package designation)

The DURF2040CT from Littelfuse Inc. meets all substitution criteria through parametric equivalence across electrical ratings and mechanical specifications.

Parameter Comparison

Parameter	SDURF2040CT (SMC Diode Solutions)	DURF2040CT (Littelfuse Inc.)	Match Status
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	Equivalent
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Equivalent
Current - Average Rectified (Io) (per Diode)	Not specified	10 A	Specification provided
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 10 A	1.3 V @ 10 A	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	45 ns	45 ns	Equivalent
Current - Reverse Leakage @ Vr	30 µA @ 400 V	10 µA @ 400 V	Littelfuse lower leakage
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-220-3 Full Pack, Isolated Tab	TO-220-3 Full Pack, Isolated Tab	Equivalent
Supplier Device Package	ITO-220AB	ITO-220AB	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS	8541.10.0080	8541.10.0080	Equivalent

Engineering Selection Recommendations

SDURF2040CT (Primary Part): The SDURF2040CT maintains Active product status with full RoHS3 compliance and REACH Affected designation. This part is suitable for applications requiring standard general-purpose rectification at 400 V with fast recovery characteristics. Current inventory of 1200 pieces supports immediate deployment.

DURF2040CT (Substitute Part): The DURF2040CT from Littelfuse Inc. is an Active product with RoHS3 compliance and REACH Unaffected status. This substitute provides parametric equivalence across all critical electrical and mechanical specifications. The DURF2040CT exhibits lower reverse leakage current (10 µA versus 30 µA at 400 V), which may provide operational advantages in low-leakage applications. Current inventory of 988 pieces is available. Both parts share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications, ensuring consistent regulatory treatment.

Frequently Asked Questions (FAQ)

Q: Can DURF2040CT directly replace SDURF2040CT in existing circuit designs?

A: Yes. Both parts are configured as 1 Pair Common Cathode diode arrays with identical 400 V reverse voltage ratings, 1.3 V forward voltage drop at 10 A, 45 ns reverse recovery time, and TO-220-3 Full Pack isolated tab packaging. Electrical performance and mechanical interface are equivalent.

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

A: The DURF2040CT exhibits 10 µA reverse leakage at 400 V compared to 30 µA for the SDURF2040CT. This lower leakage in the Littelfuse part may reduce standby power dissipation in applications with sustained reverse bias conditions. Both values remain within acceptable ranges for standard rectifier applications.

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

A: Both parts are RoHS3 compliant and share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. The SDURF2040CT carries REACH Affected status while the DURF2040CT is REACH Unaffected. This distinction does not affect functional compatibility but may influence supply chain documentation requirements depending on end-use jurisdiction.

Q: Is the TO-220-3 Full Pack isolated tab package identical between manufacturers?

A: Yes. Both parts use the ITO-220AB supplier device package designation, which specifies TO-220-3 Full Pack with isolated tab configuration. This ensures mechanical compatibility with existing PCB layouts and thermal management designs.

Q: What operating temperature range applies to both parts?

A: Both the SDURF2040CT and DURF2040CT operate across a junction temperature range of -55°C to 150°C, providing equivalent thermal performance across industrial and commercial temperature environments.

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