RS-232 Interface IC in 16-PDIP
The LT1781CN#PBF is an Analog Devices full-duplex RS-232 transceiver with two drivers and two receivers in a through-hole 16-PDIP package. It operates from a single 4.5V to 5.5V supply and supports a data rate of 250 kBd, making it suitable for legacy serial ports, industrial control panels, and test equipment that still use DB-9 or DB-25 connectors. The receiver hysteresis of 400 mV provides noise immunity on long cable runs, reducing the chance of false bit transitions in electrically noisy environments.
Commercial Temperature Range and Through-Hole Mounting
The 16-DIP (0.300", 7.62mm) package with through-hole mounting simplifies prototyping and field replacement compared to surface-mount packages, but occupies more board area and limits placement density on high-volume boards. Among RS-232 transceivers in similar DIP packages, the ADM233LJNZ runs at 120 Kbps (roughly half the data rate) and the ADM222ANZ offers 200 Kbps with a wider -40°C to 85°C temperature range, so the LT1781CN#PBF sits in the middle on speed but is limited to commercial temperature.
Active Production — No Obsolescence Concern
It is ROHS3 compliant, so it meets the latest EU restriction on hazardous substances.