IXYS DSSX110 Replacement/Upgrade Solution for DSSX Series

Product Overview

IXYS DSSX110 Replacement/Upgrade Solution for DSSX Series: Smooth Transition from Legacy Rectifier Configurations

When your existing power conversion system relies on an aging or discontinued IXYS DSSX Series Schottky rectifier module, unplanned downtime is the last thing your operation can afford. The IXYS DSSX110 — a 10A, 100V dual Schottky rectifier module — is a direct-fit replacement and upgrade solution engineered for seamless integration into industrial power supplies, motor drive front-ends, UPS systems, welding equipment, and DC bus rectifier stages. Whether you are migrating from an earlier DSSX variant, substituting a failed module in a legacy control cabinet, or standardizing your spare parts inventory, the DSSX110 delivers the electrical and mechanical compatibility your system demands without redesign.

The DSSX110 is housed in the industry-standard IXYS SOT-227B (ISOTOP®) package, which means it drops directly into existing PCB footprints and heatsink mounting arrangements used across the DSSX family. Engineers transitioning from the DSSX16, DSSX28, or DSSX60 will find that the DSSX110’s pin layout, mounting hole pattern, and thermal interface requirements are fully compatible with the same heatsink assemblies and bus bar configurations already in service. No mechanical rework of the control cabinet or power stage enclosure is required — a critical advantage when minimizing retrofit labor cost and system downtime.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful rectifier module replacement rarely involves a single component. In practice, upgrading or replacing the DSSX110 within a larger power conversion or motor control system requires attention to the surrounding power stage architecture. During the retrofit process, engineers commonly address the gate driver board or firing circuit that controls upstream thyristors or IGBTs — for example, when the DSSX110 is used as a freewheeling or snubber rectifier alongside an IXYS MCC312-16IO1 thyristor module or an IXYS VUO110-16NO7 three-phase bridge rectifier. In these configurations, the DC bus capacitor bank, typically a series of electrolytic or film capacitors rated at 100V–450V, must be inspected and replaced if capacitance has drifted beyond tolerance.

For systems where the DSSX110 is integrated into a variable frequency drive (VFD) front-end or regenerative braking circuit, the associated IXYS VHFD70-12IO7 fast recovery diode module or a compatible Semikron SKD 51/12 three-phase rectifier bridge may also require evaluation. The DC link choke, gate resistors, and snubber capacitors connected to the rectifier stage should be verified for correct ratings before commissioning the replacement module.

In control cabinet applications, the DSSX110 is frequently mounted alongside a 24VDC SITOP PSU100S power supply module or equivalent DIN-rail power supply that feeds the PLC I/O rack and communication modules. When the rectifier module is replaced, it is good practice to verify the integrity of the DC bus fuse — typically a Bussmann FWP or NH-type semiconductor fuse — and the associated fuse holder, as a failed rectifier often causes fuse degradation. The copper bus bar connections and M5 terminal torque values should be re-verified to IEC 60947-1 specifications after module installation.

For systems using fieldbus communication between the drive and the PLC — such as PROFIBUS DP, PROFINET, or Modbus RTU — the communication interface module (e.g., a Siemens CB15 or equivalent PROFIBUS adapter) does not require reconfiguration when only the rectifier module is replaced, as the power stage change is transparent to the control layer. However, if the retrofit involves upgrading the entire drive unit, the engineering team should plan for parameter migration using the drive’s commissioning software and verify that the new drive’s rated input voltage and current match the transformer secondary output.

Procurement teams sourcing the DSSX110 as a critical spare should also consider stocking related modules such as the IXYS DSSK60-0045B or DSSK28-0045B Schottky diode modules as complementary inventory items, ensuring that the most common failure-prone components in the rectifier stage are covered without requiring emergency procurement during an unplanned outage.

Retrofit Guidance FAQ

Q: Can the DSSX110 replace a DSSX60 or DSSX85 directly without circuit modification?
A: The DSSX110 shares the same SOT-227B package and dual common cathode topology as the DSSX60 and DSSX85, so the physical and electrical interface is compatible. However, the DSSX110 is rated at 10A average forward current per diode, compared to 60A or 85A for the larger variants. A direct substitution is only appropriate if the actual load current in your application does not exceed 10A per diode. If your system operates at higher currents, you must select a higher-current DSSX variant or parallel multiple DSSX110 modules with appropriate current-sharing measures.

Q: Is the wiring and terminal connection compatible with existing bus bar assemblies?
A: Yes. The DSSX110 uses the standard SOT-227B terminal layout (A1, A2, K) with M5 screw terminals, identical to other DSSX Series modules. Existing bus bar assemblies, cable lugs, and terminal torque specifications (typically 3–4 Nm) apply without modification.

Q: Does replacing the DSSX110 require any changes to the PLC program or drive parameters?
A: No. The DSSX110 is a passive power semiconductor component. Replacing it does not affect PLC logic, drive parameter sets, fieldbus node addresses, or HMI configurations. The control system operates identically after the rectifier module is replaced, provided the system is powered up and commissioned correctly.

Q: What communication protocols are unaffected by this replacement?
A: All fieldbus and industrial Ethernet protocols — including PROFIBUS DP, PROFINET IO, Modbus RTU/TCP, EtherNet/IP, and CANopen — are unaffected. The rectifier module operates at the power stage level and has no interaction with the communication layer of the control system.

Q: How do I verify the replacement module before installation?
A: Each DSSX110 unit shipped by TOPNLMS undergoes a pre-shipment functional test using a diode/semiconductor tester to verify forward voltage drop (VF), reverse leakage current (IR), and isolation integrity. A test report is available upon request. On-site, use a digital multimeter in diode-test mode to verify the forward voltage of each diode junction (typically 0.3–0.5V for Schottky) and confirm isolation between the case and terminals before mounting.

Q: What is the physical installation space requirement?
A: The SOT-227B package dimensions are standardized across the DSSX Series. The DSSX110 requires the same panel cutout, heatsink contact area, and mounting hole spacing as the module it replaces. No additional cabinet space or modified DIN-rail arrangement is needed.

Warranty Assurance

Every IXYS DSSX110 unit supplied by TOPNLMS is backed by a 12-month warranty from the date of shipment. Our warranty commitment covers functional failure under normal operating conditions and includes the following assurances:

• Pre-shipment inspection: Each module is tested for forward voltage, reverse leakage, and isolation before dispatch. A functional test report is available upon request.
• Authentic sourcing: Units are sourced from authorized distributors or verified surplus channels. Counterfeit risk is mitigated through incoming inspection and traceability documentation.
• Replacement support: In the event of a confirmed warranty claim, TOPNLMS will arrange priority replacement shipment to minimize your system downtime.
• After-sales response: Our technical team responds to warranty inquiries within 1 business day. Contact us at [email protected] or +86 18359293191 for support.
• Procurement protection: We issue a commercial invoice, packing list, and test certificate with every shipment, supporting your incoming quality control process and customs clearance.
• Global shipping: Stocked in Xiamen, China. Standard international shipment via DHL, FedEx, or UPS with tracking. Expedited options available for urgent replacement requirements.

For bulk orders, long-term supply agreements, or technical consultation on DSSX Series replacement strategy, contact our industrial components team directly.