DESD3V3Z1BCSF Ultra-Low-Capacitance TVS Diode Diodes Incorporated DESD3V3Z1BCSF Bidirectional TVS Diode is an ultra-compact TVS device with ultra-low channel input capacitance for High-Speed Dataline ESD Protection. The DESD3V3Z1BCSF is specifically designed to protect the high-speed I/O of mixed-signal SoCs (system-on-chip) built on the advanced nanometer process nodes.