The Texas Instruments SN74AVCH4T245DT is a 4-bit dual-supply translation transceiver from the 74AVCH series, designed to bridge logic levels between two independent voltage domains. Each of the two elements handles 4 bits, with 3-state outputs that let you share a bus without contention. Output drive is rated 12 mA high and low, enough for short PCB traces and light fan-out to a few CMOS loads.
Supply range and drive — what they mean for bus design
It means you can connect a 1.8 V microcontroller UART to a 3.3 V peripheral without an external level shifter — the part handles the translation internally. The 12 mA output drive is moderate; if you are driving a long backplane trace or a heavily loaded bus (more than 4–5 standard CMOS inputs), budget for signal degradation or add a buffer. For short on-board connections between two voltage domains, 12 mA is comfortable.
Package and footprint — 16-SOIC narrow
The 16-SOIC narrow package (3.90 mm width, 0.154" pitch) is a common footprint that routes easily on two-layer boards.
It is ROHS3 compliant.