The MAX250CPD is a transceiver from Analog Devices / Maxim Integrated featuring RS232 protocol. It operates from 4.5V to 5.5V and has an operating temperature range of 0°C to 70°C.
The MAX251CPD is a full duplex transceiver from Analog Devices / Maxim Integrated, operating over a temperature range of 0°C to 70°C. It features RS232 protocol and through-hole mounting.
The MAX201CPD from Analog Devices is a full-duplex RS-232 transceiver. It operates with a single 4.5V to 5.5V supply and supports data rates up to 120Kbps.