What this 74HCT240 does on your board
The Texas Instruments SN74HCT240NSR is a dual 4-bit inverting buffer and line driver with 3-state outputs, part of the 74HCT logic family. It operates from a 4.5 V to 5.5 V supply and is specified across the industrial temperature range of -40°C to 85°C. Each of the two elements handles four bits, with symmetrical 6 mA source and sink capability per output. The 3-state outputs let you connect multiple drivers to a shared bus without contention — a common requirement in memory address decoding, peripheral chip-select gating, and bidirectional data-path isolation.
Package and footprint — 20-SOIC wide-body
Housed in a 20-SOIC package with a 5.30 mm body width (0.209"), the SN74HCT240NSR is a surface-mount device that reflows on a standard lead-free profile. The supplier device package is designated 20-SO. The 1.27 mm pin pitch is compatible with common SOIC footprints, but the wider body means the pad pattern differs from the narrower 20-SOIC (7.5 mm vs 5.3 mm width variants) — verify the land pattern against your PCB layout before committing the BOM.
Lifecycle and compliance — active, ROHS3, no end-of-life risk
For new designs or production replenishment, the part is available through independent distribution channels and is quoted to order against an RFQ.
Sourcing reality — what to expect when you order
Because the SN74HCT240NSR is an active, catalog-standard logic part, it is routinely stocked across multiple independent distributors.