The Texas Instruments SN74ACT244NSR is an octal buffer and line driver from the 74ACT family, organised as two 4-bit elements with non-inverting logic and independent 3-state output enables.
The 24 mA source and sink capability is the headline rating. It gives you enough current to drive a heavily loaded backplane trace or a bank of CMOS inputs without signal degradation. In a typical 5 V system, that drive level supports a fan-out of several tens of standard LSTTL or HCT loads, which is what makes this part a workhorse for address and data bus buffering in legacy 5 V logic systems.
Supply and temperature — industrial range, 5 V only
The 74ACT family uses advanced CMOS technology with bipolar-like speed, so expect propagation delays in the single-digit nanosecond range typical of the series.
Package and footprint — 20-SOIC narrow body
It is a surface-mount part, so the PCB footprint is the standard SOIC-20 narrow pattern. The tape-and-reel suffix (NSR) means it ships on a 13" reel; cut-tape options are also available for prototype or low-volume builds.
It is ROHS3 compliant.