What this 74HC octal bus transceiver does on the board
The SN74HC245NSR is an 8-bit non-inverting bus transceiver from the 74HC family, with 3-state outputs that isolate the bus when disabled. It operates from a 2V to 6V supply rail, covering both 3.3V and 5V logic domains in a single BOM line. Rated for -40°C to 85°C ambient, this part handles industrial temperature environments without derating the output drive. The 7.8 mA source and sink current per channel is typical for HC logic driving CMOS inputs or a single LSTTL load per line.
Package and board integration
Housed in a 20-SOIC wide-body package (0.209", 5.30 mm body width), the SN74HC245NSR uses the standard 20-SO footprint with 1.27 mm pitch. The surface-mount package suits automated assembly, and the Tape & Reel packaging option feeds pick-and-place lines without reel changeover.