8-bit bus transceiver — 2V to 5.5V supply, 8 mA drive, industrial temp range
The SN74AHC245PW is an 8-bit non-inverting transceiver from Texas Instruments' 74AHC series, with 3-state outputs on both the A and B ports. It operates across a 2V to 5.5V supply range, making it suitable for mixed-voltage bus interfaces where the I/O rails span from 2V logic up to 5V legacy systems. Each output sources or sinks 8 mA, which is the standard drive for the AHC family — adequate for driving a single TTL load or a short PCB trace, but not for high-fanout buses without a buffer stage. The -40°C to 125°C operating range covers automotive under-hood and industrial enclosure environments where ambient temperature swings are wide.
Cross-reference delta — SN74ABT2245DW vs SN74AHC245PW
For a BOM originally using the SN74ABT2245DW, the SN74AHC245PW would require a board spin if the design relies on the higher output drive or the narrower supply tolerance. The package footprint (20-TSSOP vs 20-SOIC) also differs, so the PCB layout must be verified.