16-bit bus transceiver for 5V backplanes
The SN74AHCT16245DLR is a 16-bit non-inverting transceiver from the 74AHCT series, organized as two 8-bit elements with independent direction and output-enable controls. The 3-state outputs let multiple devices share a common data bus without contention — the outputs go high-impedance when the output-enable pin is deasserted, which is the standard way to build a bidirectional bus on a 5V backplane. Supply range is 4.5V to 5.5V, which covers the full 5V ±10% tolerance window used in most industrial logic and memory interfaces. The -40°C to 125°C operating temperature range qualifies it for under-hood automotive or factory-floor environments where the ambient inside the enclosure can hit 105°C.
Output drive and bus loading
Each output sources or sinks 8 mA (both high and low), which is typical for the 74AHCT family. This drive level is enough to fan out to ten 74LS-type loads or drive a short backplane trace up to about 30 pF at the rated speed. For longer traces or higher capacitive loads, the 32 mA drive of the 74ABT2245 peer would be a better fit. The 0.025-inch lead pitch requires a PCB with fine-pitch soldering capability but is well within the range of most assembly houses. The reel packaging (Tape & Reel) is the standard for automated pick-and-place — the cut-tape option is available for prototype builds.
Lifecycle and compliance
The part is ROHS3 compliant, which means it meets the current EU RoHS exemption limits for lead in solder joints and other restricted substances.