5.25V supply, 32/64 mA drive, 20-SSOP
The Texas Instruments CY74FCT540CTQCT is an 8-bit buffer with inverting logic and 3-state outputs from the 74FCT series. The single-element, 8-bit layout means one chip handles a full byte-wide data bus with a single output-enable control for the 3-state bus hold-off.
Active lifecycle and compliance baseline
For a 5V bus buffer in a control card or I/O module, this part fits without thermal derating concerns inside a ventilated enclosure.
Second-source cross-check against SN74AHCT540DGVR
The SN74AHCT540DGVR is the closest functional peer: same 8-bit inverting buffer with 3-state outputs, same 20-pin SSOP footprint. The key difference is the output drive — the 74AHCT variant delivers 8 mA typical versus the 74FCT's 32/64 mA asymmetric drive. For a lightly loaded bus (under 8 mA per line), the AHCT part is a drop-in; for higher fan-out or longer trace lengths, the FCT's stronger drive maintains signal integrity.
Sourcing posture for the BOM line
This part is sourced through authorized and independent distribution channels.