DSAI75-18B Equivalent & Substitute Parts

Part Overview

The DSAI75-18B is an avalanche diode rated for 1800 V DC reverse voltage with 110 A average rectified current, manufactured by IXYS in a DO-203AB chassis 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 performance within the specified voltage and current parameters while accommodating available packaging options.

Substiute Parts

DSAI75-18B

IXYSIn Stock: 5301DSAI75-18B Datasheet

Current PartRFQ

GKR130/18

GeneSiC SemiconductorIn Stock: 1074GKR130/18 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DSAI75-18B is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain a DC reverse voltage rating of 1800 V to ensure equivalent blocking capability in the application circuit.

Current Rating: The substitute part must support the average rectified current requirement. The DSAI75-18B specifies 110 A; substitute parts with equal or higher current ratings are acceptable.

Recovery Speed: Both the main part and substitute are specified as standard recovery diodes with recovery time greater than 500 ns at currents exceeding 200 mA.

Mounting Configuration: Both parts utilize chassis stud mount configurations, allowing mechanical interchangeability in the application.

Temperature Range: Operating temperature specifications must be compatible with the application environment.

Compliance: RoHS and REACH compliance status must be verified for regulatory requirements.

The GKR130/18 meets these substitution criteria with a 1800 V rating, 165 A current capacity (exceeding the 110 A requirement), standard recovery speed, and compatible stud mount packaging.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: The DSAI75-18B is classified as obsolete, making the GKR130/18 the identified substitute for continued component availability. The GKR130/18 maintains the critical 1800 V reverse voltage rating and exceeds the 110 A current requirement with a 165 A rating, providing operational margin.

Compliance Status: Both parts meet RoHS compliance requirements. The GKR130/18 is actively produced by GeneSiC Semiconductor, ensuring long-term supply availability compared to the obsolete DSAI75-18B.

Package Consideration: The GKR130/18 uses DO-205AA (DO-8) packaging versus the DSAI75-18B DO-203AB (DO-5) packaging. Both are stud mount configurations; however, mechanical mounting geometry differences require verification for the specific application.

Temperature Range Difference: The DSAI75-18B operates to 180°C junction temperature, while the GKR130/18 operates to 150°C. Applications requiring operation above 150°C require thermal design review.

Reverse Leakage: The GKR130/18 exhibits higher reverse leakage current (22 mA versus 6 mA at 1800 V). Applications sensitive to leakage current performance require circuit analysis to confirm acceptability.

Frequently Asked Questions (FAQ)

Q: Can the GKR130/18 directly replace the DSAI75-18B in all applications?

A: The GKR130/18 meets the core electrical requirements of 1800 V reverse voltage and exceeds the 110 A current specification. However, mechanical package differences (DO-205AA versus DO-203AB) and different operating temperature ranges require application-specific verification before substitution.

Q: What is the significance of the higher current rating on the GKR130/18?

A: The GKR130/18 is rated for 165 A average rectified current, exceeding the DSAI75-18B requirement of 110 A. This provides operational margin and allows the substitute to handle the specified load without derating.

Q: How do the package differences affect substitution?

A: Both parts use stud mount configurations for chassis mounting. The DO-205AA (DO-8) package of the GKR130/18 differs physically from the DO-203AB (DO-5) package of the DSAI75-18B. Mechanical mounting hole spacing and stud dimensions must be verified for compatibility with the application's mechanical design.

Q: Why is the reverse leakage current higher on the GKR130/18?

A: The GKR130/18 exhibits 22 mA reverse leakage at 1800 V compared to 6 mA for the DSAI75-18B. This difference reflects different semiconductor technologies and manufacturing processes between manufacturers. Applications with strict leakage current requirements must evaluate circuit impact.

Q: What is the impact of the different operating temperature ranges?

A: The DSAI75-18B operates to 180°C junction temperature, while the GKR130/18 operates to 150°C. Applications designed for operation above 150°C require thermal analysis to confirm the substitute remains within safe operating limits.

Q: Why is the DSAI75-18B classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The GKR130/18 is actively produced, ensuring availability for new designs and replacement applications.

Q: Are both parts RoHS compliant?

A: Yes. The DSAI75-18B is ROHS3 compliant, and the GKR130/18 is RoHS compliant. Both meet regulatory requirements for hazardous substance restrictions.