SDUR2040 Equivalent & Substitute Parts

Part Overview

The SDUR2040 is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 400 V DC reverse voltage with through-hole TO-220AC packaging. This component is designed for standard rectification applications requiring fast recovery characteristics and operates across a junction temperature range of -55°C to 150°C. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity level classification.

Substitute parts are identified to provide design flexibility when the primary SDUR2040 is unavailable or when application requirements necessitate alternative electrical characteristics within the same voltage class and package form factor.

Substiute Parts

SDUR2040

SMC Diode SolutionsIn Stock: 1110SDUR2040 Datasheet

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STTH30R04D

STMicroelectronicsIn Stock: 1745STTH30R04D Datasheet

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STTH30R04DY

STMicroelectronicsIn Stock: 1637STTH30R04DY Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SDUR2040 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Package / Case: TO-220-2 (TO-220AC)
• Mounting Type: Through Hole
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 15 µA @ 400 V

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Within standard rectifier diode tolerances
• Reverse Recovery Time (trr): Within fast recovery classification
• Operating Temperature - Junction: Extended range acceptable for industrial applications
• RoHS Status: ROHS3 Compliant maintained across all substitutes

The substitute parts STTH30R04D and STTH30R04DY from STMicroelectronics meet all critical matching parameters and maintain compatibility with the SDUR2040 in equivalent circuit positions.

Parameter Comparison

Engineering Selection Recommendations

STTH30R04D Selection Criteria: The STTH30R04D from STMicroelectronics is suitable for applications where the SDUR2040 is unavailable. This part maintains identical reverse voltage rating (400 V), reverse leakage current (15 µA @ 400 V), and fast recovery speed classification. The extended operating temperature range (-40°C to 175°C) provides broader thermal operating margins compared to the SDUR2040. RoHS3 compliance and unlimited MSL classification ensure regulatory and environmental compatibility. This variant is appropriate for general industrial rectification applications.

STTH30R04DY Selection Criteria: The STTH30R04DY is the automotive-grade variant of the STTH30R04D, qualified to AEC-Q101 standards. This part is functionally equivalent to STTH30R04D with identical electrical parameters and thermal range. Selection of STTH30R04DY is required for automotive applications, safety-critical systems, or designs requiring automotive-grade component qualification. Both STMicroelectronics variants maintain ROHS3 compliance and are unaffected by REACH restrictions.

Compliance Considerations: All three parts maintain RoHS3 compliance and unlimited moisture sensitivity classification. The SDUR2040 is REACH Affected, while both STMicroelectronics substitutes are REACH Unaffected. All parts carry EAR99 ECCN classification and identical HTSUS commodity codes.

Frequently Asked Questions (FAQ)

Q: Can STTH30R04D and STTH30R04DY be used interchangeably with SDUR2040?

A: Both STMicroelectronics parts are electrically and mechanically compatible with SDUR2040 in TO-220AC package applications. The critical parameters—400 V reverse voltage rating, TO-220-2 package, through-hole mounting, fast recovery speed classification, and 15 µA reverse leakage current—are identical across all three parts. The primary difference is that STTH30R04DY includes automotive-grade qualification (AEC-Q101), making it suitable for automotive applications where SDUR2040 and STTH30R04D are not qualified.

Q: What are the differences between STTH30R04D and STTH30R04DY?

A: Both parts are electrically equivalent with identical 400 V reverse voltage, fast recovery characteristics, and operating temperature range (-40°C to 175°C). The STTH30R04DY includes automotive-grade qualification per AEC-Q101 standard, while STTH30R04D is the industrial-grade variant. Forward voltage differs slightly: STTH30R04D is 1.45 V @ 30 A, while STTH30R04DY is 1.55 V @ 30 A. Selection depends on application requirements and qualification mandates.

Q: Are there temperature range limitations when substituting SDUR2040?

A: The SDUR2040 operates from -55°C to 150°C junction temperature. Both STMicroelectronics substitutes extend this range to -40°C to 175°C. For applications operating below -40°C, the SDUR2040 is required. For applications requiring operation above 150°C, the STMicroelectronics parts provide extended thermal capability.

Q: Do all three parts meet RoHS3 compliance requirements?

A: Yes. SDUR2040, STTH30R04D, and STTH30R04DY are all RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) classification. All parts are suitable for RoHS3-regulated applications.

Q: What is the significance of the reverse recovery time difference?

A: The SDUR2040 has a reverse recovery time (trr) of 45 ns, while both STMicroelectronics substitutes have 100 ns. Both values fall within the fast recovery classification (≤ 500 ns, > 200 mA). The faster recovery time of SDUR2040 may provide marginal switching efficiency advantages in high-frequency applications, but both are classified as fast recovery diodes suitable for standard rectification circuits.

Q: Can SDUR2040 be used in automotive applications?

A: The SDUR2040 does not carry automotive-grade qualification. For automotive applications, STTH30R04DY is the appropriate selection, as it is qualified to AEC-Q101 automotive standards.

Q: Are there REACH compliance differences between these parts?

A: Yes. SDUR2040 is REACH Affected, while both STTH30R04D and STTH30R04DY are REACH Unaffected. For applications subject to REACH restrictions, the STMicroelectronics substitutes provide compliance advantages.