PCF8574T/3,518
by NXP(恩智浦)The NXP PCF8574T/3,518 expands digital I/O over an I²C bus, making it useful when a controller needs additional lines for simple peripherals. This record uses an SMD SOIC-16 package. Its downloadable KiCad files contain a 16-pin symbol, the 16-pad SOIC-16_L10.3-W7.5-P1.27-LS10.3-BL footprint, and an included 3D model. Check the symbol pin assignments against the intended bus and I/O connections, then use the model to inspect package placement on the board. This conversion has been used by 3 ProtoFlow engineers in real designs. You can also open the files directly in ProtoFlow.
Download KiCad files
Use PCF8574T/3,518 in your design
ProtoFlow is a free, AI-native EDA tool. Drop this part onto a schematic, route a PCB, and let the AI copilot help. The symbol, footprint, and 3D model come in linked and ready.
Free to start. macOS, Windows and Linux. No sign-up to try.

