The SN75LBC184 and SN65LBC184 devices
are differential data line transceivers in the trade-standard footprint of the
SN75176 with built-in protection against high-energy noise transients. This feature
provides a substantial increase in reliability for better immunity to noise
transients coupled to the data cable over most existing devices. Use of these
circuits provides a reliable low-cost direct-coupled (with no isolation transformer)
data line interface without requiring any external components.
The SN75LBC184 and SN65LBC184 can
withstand overvoltage transients of 400W peak (typical). The conventional
combination wave called out in IEC 61000-4-5 simulates the overvoltage transient and
models a unidirectional surge caused by overvoltages from switching and secondary
lightning transients.