The base product number STPSC20 covers a family of 20 A SiC diodes; the H065CW variant is the common-cathode TO-247 version. If you need a different package or configuration, the family offers alternatives, but for this exact dual-diode TO-247 part, the supply outlook is stable.
Because the part is active, the primary channel is franchised distribution. On the independent market, you will see it traded mostly in tube quantities (the listed package) from excess inventory or overstock. The 650 V / 20 A SiC Schottky space has several players — ST, Wolfspeed, Infineon, Rohm — but the STPSC20H065CW is a specific common-cathode dual in TO-247, so cross-references are not pin-for-pin drop-ins without checking the footprint and thermal pad. Pricing on SiC parts has been softening as capacity ramps, but the spot price still reflects the wafer cost — expect a premium over equivalent silicon ultrafast diodes, justified by the zero-recovery switching and higher temperature capability.