74FCT inverting octal buffer — what you're getting
The CY74FCT240ATSOCT is a dual 4-bit inverting buffer with 3-state outputs from the 74FCT series, running on a 4.75V to 5.25V supply. It packs two elements, each handling four bits, and delivers 32 mA source / 64 mA sink per output — enough to drive a moderate backplane or memory-array bus without external line drivers. The 20-SOIC wide-body footprint (0.295" body width) is a standard industrial package, and the -40 to 85 °C industrial temperature grade covers most factory-floor and outdoor telecom enclosures.
Output drive and supply — what the numbers mean for your bus
The 32 mA high-level and 64 mA low-level output currents are the headline selection parameters. At 5 V nominal, that sink current handles a fan-out of roughly 10 standard LSTTL loads per output, or drives a 50 Ω terminated line with decent noise margin. The 3-state outputs let multiple devices share a common data bus — the buffer goes high-impedance when the output-enable is asserted, so a second buffer or transceiver can take over without contention. The supply range is tight: 4.75 V to 5.25 V, so this part is strictly a 5 V logic device. Don't try to run it at 3.3 V — the inputs won't recognise a 3.3 V signal as a valid high, and the outputs won't swing rail-to-rail at that voltage.
Lifecycle and compliance — active, ROHS3, no LTB worry
The CY74FCT240ATSOCT carries an Active product status and is ROHS3 compliant. The ROHS3 compliance means it passes the EU RoHS exemption list without any of the restricted substances above the threshold, so it ships into European and California markets without a compliance headache.
Storage and handling — MSL and reel care
The part ships in Tape & Reel (TR) or Cut Tape (CT) format. The 20-SOIC wide-body package is typically MSL 3 (moisture sensitivity level 3) — standard for SOIC packages.