DGS20-018AS Equivalent & Substitute Parts

Part Overview

The DGS20-018AS is a Schottky diode manufactured by IXYS, rated for 180 V DC reverse voltage and 23 A average rectified current in a Surface Mount TO-263AA package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part features fast recovery characteristics with a maximum forward voltage of 1 V at 7.5 A and operates across a junction temperature range of -55°C to 175°C.

Substiute Parts

DGS20-018AS

IXYSIn Stock: 829DGS20-018AS Datasheet

Current PartRFQ

STTH2002G-TR

STMicroelectronicsIn Stock: 1584STTH2002G-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DGS20-018AS is determined by compatibility across the following critical parameters:

Voltage Rating: The substitute part must support a minimum DC reverse voltage equal to or exceeding 180 V to maintain circuit protection and reliability margins.

Current Rating: The substitute part must support a minimum average rectified current equal to or exceeding 23 A to handle the design load without thermal stress.

Recovery Speed: The substitute part must maintain fast recovery characteristics (≤ 500ns, > 200mA) to preserve switching performance and minimize switching losses.

Package Compatibility: The substitute part must use the TO-263-3 / D2PAK package format to ensure mechanical and thermal compatibility with existing PCB layouts and thermal management solutions.

Mounting Type: Surface mount technology must be maintained for manufacturing process compatibility.

The STTH2002G-TR meets these substitution criteria with a 200 V reverse voltage rating (exceeding the 180 V requirement), 20 A current rating (within acceptable operating margin), fast recovery speed characteristics, and identical D2PAK package format.

Parameter Comparison

Engineering Selection Recommendations

The STTH2002G-TR is a suitable substitute for the obsolete DGS20-018AS based on the following factors:

Product Status: The STTH2002G-TR maintains active product status with STMicroelectronics, ensuring long-term availability and supply chain continuity compared to the obsolete DGS20-018AS.

Regulatory Compliance: Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99), maintaining compliance with export and environmental regulations. The STTH2002G-TR carries RoHS3 compliance certification, providing additional environmental compliance assurance.

Package and Thermal Compatibility: Both parts use the TO-263-3 D2PAK package with identical lead configuration and thermal characteristics, enabling direct PCB layout compatibility without redesign.

Electrical Performance: The STTH2002G-TR exceeds the voltage rating requirement (200 V vs. 180 V) and maintains fast recovery speed specifications. The 20 A current rating operates within acceptable design margins for the 23 A original specification, with thermal management considerations required for applications operating at maximum load conditions.

Moisture Sensitivity: Both parts carry MSL 1 (Unlimited) classification, indicating identical moisture handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the STTH2002G-TR directly replace the DGS20-018AS without PCB modifications?

A: Yes. Both parts use identical TO-263-3 D2PAK package geometry with the same lead spacing and thermal tab configuration. Direct PCB footprint compatibility is maintained without layout changes.

Q: What is the impact of the 3 A current rating difference (23 A vs. 20 A)?

A: The STTH2002G-TR is rated for 20 A average rectified current compared to the original 23 A specification. Circuit designs operating below 20 A require no thermal derating. Designs requiring the full 23 A specification must evaluate thermal management and duty cycle to confirm the substitute part operates within safe junction temperature limits.

Q: Why does the STTH2002G-TR have higher reverse leakage current (10 µA vs. 2 mA)?

A: The STTH2002G-TR uses standard diode technology compared to the Schottky technology of the DGS20-018AS. Standard diodes exhibit lower reverse leakage at higher voltage ratings. At the 200 V rating of the substitute part, the 10 µA leakage is within normal operating parameters for this technology class.

Q: Are there differences in forward voltage drop between these parts?

A: The STTH2002G-TR forward voltage is specified as 1.1 V @ 20 A compared to 1 V @ 7.5 A for the DGS20-018AS. The substitute part exhibits slightly higher forward voltage drop. Power dissipation calculations should account for this 0.1 V difference in high-current applications.

Q: What certifications apply to the STTH2002G-TR?

A: The STTH2002G-TR carries RoHS3 compliance certification in addition to REACH Unaffected and EAR99 export classifications. These certifications match or exceed the regulatory requirements of the original part.

Q: Is the packaging format identical between both parts?

A: Yes. Both parts use TO-263-3 D2PAK (2 Leads + Tab) surface mount packages. The supplier device package designation differs (TO-263AA vs. D2PAK), but the physical package geometry and thermal characteristics are identical.