5 V CMOS RS-232 transceiver in a 20-pin DIP
The receiver hysteresis is specified at 500 mV, which provides clean signal recovery on RS-232 cable runs in electrically noisy factory-floor environments.
RoHS status and assembly line impact
This part is intended for legacy or exempt applications where lead-free assembly is not required, or for repair and MRO stock where the original BOM specified tin-lead solder.
Second-source and pin-compatible alternatives
For dual-sourcing or a lead-free alternative, the ADM202JNZ (Analog Devices) is a pin-compatible through-hole RS-232 transceiver with the same 2/2 driver/receiver count and 0°C to 70°C range, though its receiver hysteresis is 400 mV versus the AD233JN's 500 mV. The ADM233LJNZ is another through-hole option with 650 mV hysteresis and a rated data rate of 120 kbps, but it also runs on a 5 V supply in the same temperature grade. Neither is a direct drop-in if the hysteresis or data rate spec is critical, but both are worth qualifying for supply resilience.