8EWS12S

Overview

The Vishay General Semiconductor - Diodes Division 8EWS12S is a surface mountable input rectifier diode from the SAFEIR series, housed in a TO-252AA (D-Pak) package. It features a maximum repetitive peak reverse voltage of 1200V and an average forward current rating of 8A at a case temperature of 95°C. The device exhibits a low forward voltage drop of less than 1V at 5A and supports a peak one-cycle non-repetitive surge current of up to 200A. Designed for reliable operation with junction temperatures ranging from -55°C to 150°C, it utilizes glass passivation technology.

Feature Summary

• Optimized for very low forward voltage drop with moderate leakage characteristics
• Glass passivation technology ensures reliable operation up to 150°C junction temperature
• High reverse voltage range provides outstanding voltage surge capability

Applications

• Input stage primary rectification
• Single-phase bridge rectification circuits
• Three-phase bridge rectification circuits

Procurement Notes

Verify the specific part number suffix against official documentation to confirm tape and reel orientation options, such as TRL or TRR, as these indicate physical packaging variations rather than functional changes. Ensure compatibility with recommended footprint dimensions and soldering techniques specified in application note AN-994 to maintain thermal performance and mechanical integrity during assembly.

Selection Notes

Select this component when high voltage isolation and low conduction loss are required in surface mount designs. The 8EWS12S is suitable for applications demanding robust surge handling capabilities alongside standard recovery characteristics. Consider the thermal resistance parameters and allowable case temperatures when designing heat dissipation strategies for continuous DC or pulsed current operations.

Part Context

This component belongs to the SAFEIR series of rectifiers, which are engineered for efficient power conversion. The 8EWS..S designation indicates a single diode configuration in a D-Pak package with standard recovery properties. These devices are designed to complement International Rectifier switches and output rectifiers sharing identical package outlines, facilitating standardized board layouts across power supply architectures.

Replacement Considerations

Consult factory resources for higher voltage variants up to 1600V if system requirements exceed the rated VRRM. Verify that any substitute maintains the TO-252AA footprint and matches the electrical specifications for forward voltage and surge current to ensure circuit compatibility.