2022.11.09 - SSDI Supports High Power / Voltage Devices with Legacy Packaging

SDR50120: 50 A, 1200 V Very Fast Recovery Rectifier

La Mirada, California – Even though high reliability designs utilize the high power / voltage capabilities of stud mount and TO-can type packages, most semiconductor manufacturers are discontinuing support for these legacy packages. Some of these manufacturers want to avoid the challenges of maintaining hermeticity for large cavity packages (e.g. TO-3, DO-4, DO-5, etc.), while others are abandoning these product lines due to low market demand.

When a defense contractor could no longer procure a high voltage rectifier in the DO-5 package for their maritime defense application, SSDI was able to offer the SDR50120 as a drop-in replacement. The SDR50120 delivers 50 amps and a reverse voltage of 1200 volts. This device also features a very fast recovery of 100 ns typical, a low leakage current of 25 µA (@ 25°C, rated VR), and a low capacitance of 105 pF (typ, @ 10 V). Since SSDI has served aerospace and defense programs for over 50 years, its engineering and manufacturing teams have the expertise and capabilities to produce high reliability devices in a wide variety of legacy packages.

3H focus + design / packaging flexibility = solutionsWith its design and packaging flexibility, SSDI can offer additional packages such as surface mount options to reduce weight and maximize board space. SSDI also welcomes special requirements including targeting specific electrical requirements and offering different configurations (e.g. SDR50120 offers both normal and reverse pin configurations). When multiple military aircraft programs encountered hermeticity issues with a competitor’s part, SSDI developed an alternative construction, which incorporated a hermetic diode inside of the DO-5 cavity. This flexibility allows SSDI to quickly build prototypes for rapid evaluation and accommodate low to medium volume orders. Contact SSDI online or at (562) 404-4474 to discuss your specific program needs.


  • Fast recovery: 120 ns max
  • Soft recovery
  • Low reverse leakage current
  • Low capacitance
  • Single chip construction
  • PIV to 1200 volts
  • Hermetically sealed
  • For high efficiency applications
  • TX, TXV, and S-level screening available

RectifiersVisit the Rectifiers product category (PRODUCTS > Rectifiers) to view additional Rectifiers and data sheets

SSDI's Rectifiers Catalog is also available for download at SUPPORT > Literature

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JANS Certified / ISO 9001 and AS9100 Certified Manufacturer of High Power and High Voltage Products for the Aerospace and Defense Industries