RS232 transceiver with three full channels
The LT1039CN#PBF is an RS232 transceiver from Analog Devices, offering three drivers and three receivers in a full-duplex configuration — one more channel than the common 2/2 parts like the ADM202JNZ. That extra channel saves a second transceiver when the BOM calls for three RS232 ports.
Supply flexibility and receiver noise margin
Receiver hysteresis is specified at 400 mV, which filters out line noise on long RS232 cables without external schmitt triggers. Compared to the ADM202JNZ (2/2) or the ADM233LJNZ (2/2), the LT1039CN#PBF's 3/3 channel count and wider supply range are the deciding factors when the system needs three RS232 ports on a single DIP package.
Active production and through-hole package
The 18-pin DIP through-hole package is suitable for prototyping, legacy board repairs, or designs where socketed ICs are preferred for field service.