Ultrafast Medium VF and QRR (600V)  

ST’s medium VF and QRR 200 to 400 V ultrafast diode series offers a current range from 1 A up to 80 A. The low current ratings are typically used in snubber circuits, while high-current ratings are used in high power PFC working in continuous mode hard switching, where fast switching is limited by EMI (electro-magnetic interferences) constraints. 

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New 600V 'RQ' ultrafast diode series: low Vf and soft reverse recovery
For high-power SMPS, snubber circuits, free-wheeling

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