Dual inverting 3-state buffer for 5 V bus isolation
The Nexperia 74HCT240DB,112 is a dual inverting buffer with 3-state outputs, organized as two elements of four bits each. It is designed for 5 V logic systems where bus isolation, signal inversion, or line driving is needed — common in industrial control, motor drives, and telecom backplanes that still run on a 5 V rail. The HCT family is pin-compatible with 74LS and 74HC logic, but its TTL-compatible input thresholds let it interface directly with legacy ASIC or microprocessor outputs that swing to only 2.4 V high.
Supply and temperature range — industrial and automotive environments
The 6 mA source and 6 mA sink drive per output is modest — enough for one or two standard TTL loads or a short PCB trace — so if you are driving a long backplane or a high-capacitance bus, plan on a fan-out buffer stage or a higher-drive part like the 74HCT245.
Package and mounting — 20-SSOP footprint
Supplied in a 20-SSOP package (0.209" body width, 5.30 mm), surface-mount only. The SSOP footprint is common for 20-pin bus-interface parts; the 0.65 mm pin pitch demands careful solder-paste stencil design to avoid bridges.
Lifecycle and sourcing posture
Nexperia continues to manufacture the 74HCT family, so this part is available through standard distribution. There is no official second-source listed in the record, but the 74HCT240 is a standard logic function offered by multiple vendors (TI, ON Semiconductor) — a cross-reference search against those manufacturers' 74HCT240 in 20-SSOP is straightforward if dual-sourcing is required.