What this 74ABT transceiver is and where it fits
The TI SN74ABT245BDW is an 8-bit non-inverting bus transceiver from the 74ABT family, packing a single 8-bit element with 3-state outputs in a 20-SOIC wide-body package. It runs on a 4.5V to 5.5V supply rail — strictly 5V logic territory — and delivers 32mA source, 64mA sink per output. That sink current is the headline number: it can drive heavily loaded parallel buses, backplane traces, or multiple CMOS inputs without sagging the logic levels. The -40°C to 85°C industrial temperature range covers factory-floor automation, outdoor telecom cabinets, and unheated equipment rooms. If your BOM already runs 5V logic and needs a bidirectional bus buffer that can handle a long trace or a fan-out of ten loads, this is the part.
5V-only supply — compatibility check for mixed-voltage boards
The SN74ABT245BDW operates from 4.5V to 5.5V only. It is not a 3.3V-tolerant part — feeding 3.3V into the VCC pin will not meet the minimum supply and the outputs will not swing to valid CMOS levels. If your board has a 3.3V bus on the other side, you need a level-shifting transceiver like the 74LVC245 or 74AVC family. For pure 5V systems, the ABT245 gives you the drive strength that the lower-voltage families cannot match.
Output drive — 64mA sink for heavy bus loads
The 64mA low-level output current is the spec that matters when you are driving a backplane or a memory bus with multiple stubs. Each output can sink 64mA while staying within VOL limits — that is enough to drive a 50-ohm terminated line or a bank of eight LSTTL inputs. The 32mA source side is more modest but still double what a standard 74HC part delivers. If your bus has long traces or many loads, this part keeps the noise margin intact.
Lifecycle and supply posture
TI lists the SN74ABT245BDW as Active with ROHS3 compliance. No end-of-life notice, no last-time-buy pressure. It is a current-production part available through the standard TI distribution channel. For a BOM line that needs a 5V bus transceiver, this is a low-risk, long-availability choice.