DSI30-12AC Equivalent & Substitute Parts

Part Overview

The DSI30-12AC is a general-purpose rectifier diode manufactured by IXYS, rated for 1200 V DC reverse voltage and 30 A average rectified current. The device features standard recovery characteristics and is packaged in the ISOPLUS220™ through-hole format. This diode is classified as Active product status and is RoHS3 compliant.

Substitute parts become necessary when ISOPLUS220™ packaging is unavailable, when alternative thermal characteristics are required, or when different current ratings better match application requirements. The substitute diodes listed maintain the same 1200 V voltage rating and through-hole mounting technology while offering different current ratings and package configurations.

Substiute Parts

DSI30-12AC

IXYSIn Stock: 737DSI30-12AC Datasheet

Current PartRFQ

STTH512FP

STMicroelectronicsIn Stock: 16130STTH512FP Datasheet

SimilarRFQ

STTH812FP

STMicroelectronicsIn Stock: 1340STTH812FP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DSI30-12AC is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage (Vr) of 1200 V to ensure compatibility with the original circuit design.

Mounting Technology: All substitute parts must use through-hole mounting to maintain mechanical compatibility with existing PCB layouts.

Current Rating: Substitute parts may have lower average rectified current (Io) ratings than the original 30 A specification. Lower current-rated diodes can be used in applications where the actual circuit current does not exceed the substitute part's rating.

Recovery Characteristics: Substitute parts may feature faster recovery times than the original standard recovery specification. Fast recovery diodes are electrically compatible with circuits designed for standard recovery diodes.

Package Configuration: Substitute parts use TO-220-2 Full Pack with isolated tab configuration instead of ISOPLUS220™, requiring PCB layout modification.

Compliance: All substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original part's regulatory standing.

Parameter Comparison

Engineering Selection Recommendations

DSI30-12AC (Main Part): Select this part when the application requires 30 A average rectified current capacity and ISOPLUS220™ package compatibility is mandatory. This part is Active status with full RoHS3 compliance and REACH unaffected designation.

STTH512FP (5 A Substitute): This STMicroelectronics part is suitable for applications where circuit current does not exceed 5 A. The TO-220FPAC package requires PCB layout modification. This part features fast recovery characteristics and is Active status with RoHS3 compliance. Operating temperature maximum of 175°C exceeds the main part specification.

STTH812FP (8 A Substitute): This STMicroelectronics part is suitable for applications where circuit current does not exceed 8 A. The TO-220FPAC package requires PCB layout modification. This part features fast recovery characteristics and is Active status with RoHS3 compliance. Operating temperature maximum of 175°C exceeds the main part specification.

All substitute parts maintain the 1200 V voltage rating and through-hole mounting technology. Selection between substitute parts depends on actual circuit current requirements and package footprint availability on the PCB.

Frequently Asked Questions (FAQ)

Q: Can STTH512FP or STTH812FP be used as direct replacements for DSI30-12AC?

A: Direct replacement is not possible due to package differences. STTH512FP and STTH812FP use TO-220FPAC packages while DSI30-12AC uses ISOPLUS220™. PCB layout modification is required. Additionally, both substitute parts have lower current ratings (5 A and 8 A respectively) compared to the 30 A rating of DSI30-12AC.

Q: What is the primary limitation when using STTH512FP or STTH812FP as substitutes?

A: The primary limitation is current capacity. STTH512FP is rated for 5 A average rectified current and STTH812FP for 8 A. These substitutes are only suitable for applications where the actual circuit current does not exceed these ratings. If the application requires the full 30 A capacity of DSI30-12AC, these substitutes are not appropriate.

Q: Are the substitute parts electrically compatible with circuits designed for DSI30-12AC?

A: Both substitute parts maintain the same 1200 V DC reverse voltage rating as DSI30-12AC, ensuring voltage compatibility. Both feature through-hole mounting technology. However, the substitute parts have faster recovery characteristics (≤ 500ns) compared to the standard recovery specification (>500ns) of DSI30-12AC. Fast recovery diodes are electrically compatible with circuits designed for standard recovery diodes.

Q: What are the package differences between DSI30-12AC and the substitute parts?

A: DSI30-12AC uses ISOPLUS220™ package while STTH512FP and STTH812FP use TO-220-2 Full Pack with isolated tab (TO-220FPAC). These packages have different physical dimensions and pin configurations, requiring PCB layout modification for substitution.

Q: Do the substitute parts meet the same compliance standards as DSI30-12AC?

A: Yes. Both STTH512FP and STTH812FP are RoHS3 compliant and REACH unaffected, matching the compliance status of DSI30-12AC. Both parts are classified as Active product status.

Q: What is the reverse leakage current difference between DSI30-12AC and the substitutes?

A: DSI30-12AC has a reverse leakage current of 50 µA at 1200 V. STTH512FP has 5 µA and STTH812FP has 8 µA at 1200 V. The substitute parts exhibit lower reverse leakage current, which is beneficial for circuit performance.

Q: Can I use STTH812FP instead of STTH512FP if I need slightly higher current capacity?

A: Yes. STTH812FP is rated for 8 A average rectified current compared to STTH512FP at 5 A. Both use identical TO-220FPAC packaging and maintain the same 1200 V voltage rating. Selection between these two depends on the actual circuit current requirement.