DSA75-18B Equivalent & Substitute Parts

Part Overview

The DSA75-18B is an avalanche diode rated for 1800 V DC reverse voltage with 110 A average rectified current, manufactured by IXYS in a DO-203AB stud mount package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating package and mounting variations.

Substiute Parts

DSA75-18B

IXYSIn Stock: 5329DSA75-18B Datasheet

Current PartRFQ

GKN130/18

GeneSiC SemiconductorIn Stock: 773GKN130/18 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DSA75-18B is determined by the following critical parameters:

Voltage Compatibility: The substitute must maintain a DC reverse voltage rating of 1800 V or greater to ensure safe operation within the original circuit design envelope.

Current Capacity: The substitute must support an average rectified current rating equal to or exceeding 110 A. Higher current ratings provide design margin and extended operational capability.

Mounting Configuration: The substitute must employ chassis or stud mount construction to ensure mechanical compatibility with existing thermal management and circuit board layouts.

Package Type: The substitute must utilize a compatible stud mount package (DO-203AB, DO-205AA, or equivalent DO-5/DO-8 variants) to maintain physical fit and electrical connection integrity.

Recovery Speed: The substitute must maintain standard recovery characteristics (>500 ns) to preserve circuit timing and switching behavior.

Thermal Range: The substitute operating temperature range must encompass or exceed the original specification to ensure reliability across the intended application environment.

Regulatory Compliance: The substitute must meet applicable RoHS and REACH requirements for the target market and application.

Parameter Comparison

Engineering Selection Recommendations

GKN130/18 as Primary Substitute:

The GKN130/18 from GeneSiC Semiconductor qualifies as a direct functional substitute for the obsolete DSA75-18B. Both components share identical 1800 V reverse voltage ratings and standard recovery speed characteristics. The GKN130/18 provides 165 A average rectified current capacity, which exceeds the original 110 A requirement, offering design margin for thermal and electrical stress conditions.

Product Status Advantage:

The GKN130/18 maintains active product status with current manufacturing and supply chain availability (695 pcs in stock), eliminating obsolescence risk associated with the DSA75-18B. This status ensures long-term component sourcing for production and field service applications.

Compliance Certification:

Both components meet RoHS compliance requirements. The GKN130/18 carries RoHS Compliant certification suitable for regulated markets. REACH compliance status is unaffected for both parts, confirming regulatory alignment.

Package and Mounting Considerations:

The GKN130/18 utilizes DO-205AA (DO-8) stud mount packaging, which is mechanically and electrically compatible with the original DO-203AB (DO-5) configuration. Both packages employ identical stud mount construction for thermal management and circuit integration. Physical dimensions and mounting hole patterns are compatible with standard chassis mount applications.

Thermal Operating Range:

The GKN130/18 specifies a maximum junction temperature of 150°C, which is 30°C lower than the DSA75-18B specification of 180°C. Applications operating near the upper thermal limit of the original design require thermal analysis to confirm the substitute remains within acceptable operating margins.

Reverse Leakage Consideration:

The GKN130/18 exhibits higher reverse leakage current (22 mA @ 1800 V) compared to the DSA75-18B (6 mA @ 1800 V). This difference reflects technology variations between avalanche and standard diode designs. Circuit designs with stringent leakage current requirements must evaluate this parameter against application specifications.

Frequently Asked Questions (FAQ)

Q: Can the GKN130/18 be used as a direct replacement for the DSA75-18B without circuit modification?

A: The GKN130/18 is electrically compatible for voltage and current specifications. However, the higher reverse leakage current and lower maximum junction temperature require verification against circuit design margins. Thermal management and leakage-sensitive applications must be evaluated individually.

Q: What is the significance of the different package designations (DO-203AB vs. DO-205AA)?

A: Both packages are stud mount variants within the DO-5/DO-8 family. DO-203AB and DO-205AA employ identical mounting configurations and electrical connection schemes. Physical dimensions are compatible with standard chassis mount applications. Mechanical fit verification with existing mounting hardware is recommended.

Q: Why does the GKN130/18 have higher reverse leakage current?

A: The GKN130/18 is classified as a standard technology diode, while the DSA75-18B is an avalanche diode. Technology differences result in different leakage characteristics. The 22 mA leakage at 1800 V is within acceptable limits for most power rectification applications but must be confirmed against circuit specifications for sensitive applications.

Q: Is the GKN130/18 suitable for applications requiring the full 180°C junction temperature range?

A: The GKN130/18 maximum junction temperature is 150°C. Applications designed to operate at 150°C to 180°C require thermal redesign or alternative component selection. Thermal analysis of the specific application is necessary to determine if 150°C maximum temperature is acceptable.

Q: What are the inventory implications of selecting the GKN130/18?

A: The GKN130/18 is in active production with 695 pcs currently in stock, providing immediate availability and long-term supply chain stability. The DSA75-18B is obsolete with limited remaining inventory (5300 pcs), making the GKN130/18 the preferred choice for new designs and ongoing production.

Q: Are both components RoHS compliant?

A: Yes. The DSA75-18B is ROHS3 Compliant, and the GKN130/18 is RoHS Compliant. Both meet regulatory requirements for restricted substance elimination in electronic components.

Q: How do the forward voltage characteristics compare between the two diodes?

A: The DSA75-18B specifies 1.17 V forward voltage at 150 A, while the GKN130/18 specifies 1.5 V at 60 A. These measurements are taken at different current levels, making direct comparison imprecise. Forward voltage performance depends on operating current and junction temperature. Circuit designs sensitive to forward voltage drop require detailed datasheet analysis or prototype testing.