STTH3002W Equivalent & Substitute Parts

Part Overview

The STTH3002W is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 30 A average rectified current in a DO-247 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The fast recovery characteristic (≤500 ns) and 50 ns reverse recovery time position this diode for applications requiring rapid switching performance in power conversion circuits.

Substiute Parts

STTH3002W

STMicroelectronicsIn Stock: 1810STTH3002W Datasheet

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APT30D20BG

Microchip TechnologyIn Stock: 1618APT30D20BG Datasheet

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DSEI60-02A

IXYSIn Stock: 19593DSEI60-02A Datasheet

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SDUR3020W

SMC Diode SolutionsIn Stock: 4154SDUR3020W Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STTH3002W is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): 30 A minimum
• Mounting Type: Through Hole
• Package / Case: DO-247 or TO-247 variants
• Speed Classification: Fast Recovery ≤500 ns

Secondary Compatibility Factors:

• Reverse Recovery Time (trr): ≤50 ns preferred
• Forward Voltage (Vf): Within acceptable operating range
• Reverse Leakage Current: Acceptable for application
• RoHS3 Compliance: Required for regulatory alignment

The three substitute parts listed below meet the primary matching criteria and are electrically compatible with the STTH3002W within the specified parameter ranges. Variations in forward voltage, reverse recovery time, and reverse leakage current reflect different semiconductor technologies and manufacturing processes but do not preclude functional substitution in standard rectification applications.

Parameter Comparison

Engineering Selection Recommendations

APT30D20BG (Microchip Technology)

The APT30D20BG is an active product with identical voltage and current ratings to the STTH3002W. This part features a shorter reverse recovery time (24 ns versus 50 ns), which provides improved switching performance. The forward voltage is elevated at 1.3 V compared to 1.05 V, resulting in increased power dissipation in high-current applications. Reverse leakage current is significantly higher at 250 µA. The APT30D20BG maintains ROHS3 compliance and offers an extended operating temperature range (-55°C to 175°C). This substitute is suitable for applications where switching speed improvement justifies the increased forward voltage drop.

DSEI60-02A (IXYS)

The DSEI60-02A is an active product with 200 V reverse voltage rating but elevated current capacity at 69 A. This part matches the 50 ns reverse recovery time of the STTH3002W and provides lower forward voltage (1.08 V @ 60 A) compared to the original specification. Reverse leakage current is 50 µA, representing a moderate increase. The DSEI60-02A maintains ROHS3 compliance but operates at a reduced maximum junction temperature (150°C versus 175°C). This substitute is applicable in applications where higher current capacity provides design margin or where the lower forward voltage reduces thermal management requirements.

SDUR3020W (SMC Diode Solutions)

The SDUR3020W is an active product with matched voltage and current ratings (200 V, 30 A). This part features a 35 ns reverse recovery time, providing improved switching performance relative to the STTH3002W. Forward voltage is 1.2 V @ 30 A, representing a moderate increase. Reverse leakage current is the lowest among substitutes at 10 µA. The SDUR3020W maintains ROHS3 compliance and offers an extended operating temperature range (-55°C to 150°C). REACH status is listed as affected, requiring verification for applications subject to REACH regulations. This substitute provides balanced electrical characteristics with minimal reverse leakage.

Frequently Asked Questions (FAQ)

Q: Can the APT30D20BG directly replace the STTH3002W in existing designs?

A: The APT30D20BG is electrically compatible for direct substitution based on voltage and current ratings. However, the increased forward voltage (1.3 V versus 1.05 V) will result in higher power dissipation. Thermal analysis of the application is required to confirm that heat dissipation remains within acceptable limits. The shorter reverse recovery time (24 ns) may improve switching performance in some circuits.

Q: Why does the DSEI60-02A have a higher current rating (69 A) than the STTH3002W (30 A)?

A: The DSEI60-02A is a higher-capacity device designed for applications requiring greater current handling. While it exceeds the 30 A requirement of the STTH3002W, it remains compatible for substitution in circuits rated for 30 A operation. The additional current capacity provides design margin and does not create incompatibility. The device will operate within its safe operating area at 30 A.

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

A: Reverse leakage current affects power dissipation and circuit performance at reverse bias conditions. The STTH3002W specifies 20 µA @ 200 V. The APT30D20BG (250 µA) exhibits higher leakage, while the SDUR3020W (10 µA) exhibits lower leakage. For most rectification applications, these differences are negligible. Applications with stringent leakage requirements (such as precision analog circuits) should select the SDUR3020W.

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

A: The STTH3002W uses a DO-247-2 package. The substitute parts use TO-247-2 or TO-247 variants (APT30D20BG: TO-247-2; DSEI60-02A: TO-247AD; SDUR3020W: TO-247AC). These packages are mechanically and electrically compatible for through-hole mounting applications. Pin configurations and lead spacing are equivalent, allowing direct board-level substitution without layout modification.

Q: What is the impact of the SDUR3020W's REACH Affected status?

A: The SDUR3020W is listed as REACH Affected, indicating that certain substances in the component are subject to REACH regulations. Applications subject to REACH compliance requirements must verify that the SDUR3020W meets specific regulatory obligations. The APT30D20BG and DSEI60-02A are listed as REACH Unaffected and may be preferred for applications with strict REACH compliance mandates.

Q: Which substitute part provides the best thermal performance?

A: The DSEI60-02A offers the lowest forward voltage (1.08 V @ 60 A), resulting in the lowest power dissipation at rated current. However, its maximum junction temperature is limited to 150°C compared to 175°C for the STTH3002W. The SDUR3020W provides a balanced approach with 1.2 V forward voltage and a 150°C maximum junction temperature. Thermal performance depends on both forward voltage and heat dissipation capability of the specific application circuit.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: All substitute parts meet the fast recovery specification (≤500 ns). The APT30D20BG (24 ns trr) and SDUR3020W (35 ns trr) offer faster switching than the STTH3002W (50 ns trr), making them suitable for higher-frequency applications. The DSEI60-02A matches the original 50 ns recovery time. Selection should be based on the specific switching frequency and circuit requirements of the application.