Octal bus transceiver for mixed-voltage backplanes
The Texas Instruments SN74HC245PW is an octal (8-bit) non-inverting bus transceiver from the 74HC family, with 3-state outputs on both the A and B ports. It handles bidirectional data flow between two buses under direction (DIR) and output-enable (OE) control. The supply range of 2V to 6V covers both 3.3V and 5V logic rails, making it a common choice for mixed-voltage backplanes, memory interfaces, and peripheral bus isolation in industrial control and telecom equipment.
2V to 6V supply — 3.3V and 5V compatibility confirmed
The 2V to 6V supply range directly answers the most common fit question: yes, the SN74HC245PW is compatible with 3.3V logic. It operates from 3.3V ±10% with margin, and also runs on 5V for legacy TTL-level buses. If you need to drive longer traces or multiple fan-outs, budget for a buffer stage or move to a higher-drive family like 74HCT or 74ACT.
The 20-TSSOP package (4.40mm body width, 0.65mm pitch) is reworkable with hot air if you have a fine nozzle and steady hands. The thermal mass is low, so it heats quickly; use a 260°C peak profile with a preheat around 150°C to avoid lifting pads. No exposed pad, so inspection is straightforward.