The STMicroelectronics BAS70FILM is a small-signal Schottky diode rated for 70 V reverse voltage (Vr max) and 70 mA average rectified current (Io). Its 1 V forward drop at 15 mA is typical for a Schottky of this current class, and the 2 pF junction capacitance at 0 V, 1 MHz makes it suitable for high-speed switching and signal clamping in low-power circuits. The SOT-23-3 package allows direct placement on compact PCBs alongside other surface-mount passives.
Obsolete — last-time-buy reality
The BAS70FILM is marked obsolete by STMicroelectronics. For a production BOM, a pin-compatible alternative from the BAS70 family (such as the BAS70-04FILM or BAS70-05FILM) should be evaluated; those remain in current lifecycle status.
Low capacitance — design note for signal clamping
The 2 pF capacitance (at 0 V, 1 MHz) is the standout spec for RF and high-speed digital I/O protection. A standard switching diode like the 1N4148 has roughly 4 pF; the BAS70FILM halves that, reducing signal degradation on clock lines and data buses up to several hundred MHz. If the application is a simple DC rectifier or polarity protection below 100 kHz, the capacitance is irrelevant — but for ESD clamps on Ethernet, USB, or CAN lines, this part earns its place.