STTH20R04G Equivalent & Substitute Parts

Part Overview

The STTH20R04G is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 20 A average rectified current in a D2PAK surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing production and maintenance applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the same application category.

Substiute Parts

STTH20R04G

STMicroelectronicsIn Stock: 2083STTH20R04G Datasheet

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STTH20R04G-TR

STMicroelectronicsIn Stock: 4220STTH20R04G-TR Datasheet

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SDURB2040

SMC Diode SolutionsIn Stock: 1096SDURB2040 Datasheet

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SDURB2040CT

SMC Diode SolutionsIn Stock: 862SDURB2040CT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STTH20R04G is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): 400 V minimum
• Current - Average Rectified (Io): 20 A minimum
• Reverse Recovery Time (trr): 45 ns maximum
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Supplier Device Package: D2PAK

Regulatory Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalent (Identical Specifications): STTH20R04G-TR maintains all electrical and mechanical parameters identical to the main part, with the distinction of active product status and Tape & Reel packaging format.

Category 2 - Functional Substitute (Parameter Variance Acceptable): SDURB2040 and SDURB2040CT are alternative manufacturer solutions that meet or exceed the core electrical requirements within the D2PAK package form factor. These parts exhibit variations in forward voltage, reverse leakage current, and operating temperature range that remain within acceptable tolerances for general-purpose rectification applications.

Parameter Comparison

Engineering Selection Recommendations

STTH20R04G-TR (STMicroelectronics): This part is the primary equivalent for STTH20R04G replacement. It maintains identical electrical specifications and D2PAK package configuration. The distinction is active product status and Tape & Reel packaging, making it suitable for production environments requiring continuous supply. RoHS3 compliance and MSL 1 rating confirm regulatory alignment with the original part.

SDURB2040 (SMC Diode Solutions): This part qualifies as a functional substitute with improved forward voltage characteristics (1.51 V versus 1.7 V at 20 A) and lower reverse leakage current (15 µA versus 20 µA at 400 V). The operating temperature range is reduced to -55°C to 150°C compared to the original 175°C maximum junction temperature. This part is suitable for applications where the reduced maximum junction temperature does not constrain thermal design. RoHS3 compliance is confirmed; REACH status is affected.

SDURB2040CT (SMC Diode Solutions): This part is a diode array configuration (1 Pair Common Cathode) in the D2PAK package. It is not a direct substitute for single-diode applications due to its internal configuration. Selection of this part requires circuit redesign to accommodate the common cathode topology. Operating temperature range is -55°C to 150°C. This part is applicable only when the common cathode configuration aligns with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can STTH20R04G-TR be used as a direct replacement for STTH20R04G?

A: Yes. STTH20R04G-TR is electrically and mechanically identical to STTH20R04G. The primary difference is packaging format (Tape & Reel versus bulk) and active product status. Both parts meet the same electrical specifications: 400 V reverse voltage, 20 A average rectified current, 1.7 V forward voltage at 20 A, and 45 ns reverse recovery time. Both are housed in TO-263-3 D2PAK packages and comply with ROHS3 and MSL 1 requirements.

Q: What are the key differences between SDURB2040 and the original STTH20R04G?

A: SDURB2040 maintains the same 400 V reverse voltage rating, 20 A current capacity, 45 ns reverse recovery time, and D2PAK package. Differences include: forward voltage of 1.51 V at 20 A (versus 1.7 V), reverse leakage current of 15 µA at 400 V (versus 20 µA), and operating temperature range of -55°C to 150°C (versus 175°C maximum). These variations represent improved performance in forward voltage and leakage characteristics but reduced maximum junction temperature capability.

Q: Is SDURB2040CT suitable as a replacement for STTH20R04G?

A: SDURB2040CT is not a direct replacement. This part is a diode array with 1 Pair Common Cathode configuration, whereas STTH20R04G is a single diode. Although both are housed in D2PAK packages and rated for 400 V, the internal topology differs fundamentally. SDURB2040CT selection requires circuit redesign to accommodate the common cathode configuration and is applicable only when this topology meets application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. STTH20R04G-TR, SDURB2040, and SDURB2040CT are all ROHS3 compliant. All parts also carry MSL 1 (Unlimited) moisture sensitivity rating, confirming compatibility with standard handling and storage procedures.

Q: What is the impact of the reduced maximum junction temperature in SDURB2040?

A: SDURB2040 has a maximum junction temperature of 150°C compared to 175°C for STTH20R04G. This 25°C reduction affects thermal design margins. Applications operating near the original 175°C limit require thermal analysis to confirm that SDURB2040 junction temperature remains within its 150°C maximum under worst-case conditions. For applications with adequate thermal margin, this difference is not operationally significant.

Q: Can SDURB2040 be used in high-temperature applications?

A: SDURB2040 is rated to a maximum junction temperature of 150°C, which is 25°C lower than STTH20R04G. Applications requiring sustained operation above 150°C junction temperature must use STTH20R04G-TR or evaluate alternative parts with higher temperature ratings. Thermal analysis of the specific application is required to determine if the reduced rating is acceptable.

Q: What packaging formats are available for these parts?

A: STTH20R04G is supplied in bulk packaging. STTH20R04G-TR, SDURB2040, and SDURB2040CT are supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes. Bulk packaging may require special order or alternative sourcing.

Q: Are there REACH compliance differences between substitute parts?

A: STTH20R04G and STTH20R04G-TR are REACH Unaffected. SDURB2040 and SDURB2040CT are REACH Affected. Applications subject to REACH regulations must confirm compliance requirements with supply chain and regulatory documentation before part selection.