The LTC4310 is a hot swappable I²C isolator that provides fully bidirectional communication between two I²C busses whose grounds are isolated from one another. Clock stretching, clock synchronization, and arbitration work seamlessly across the isolation barrier. I²C isolation has traditionally been achieved using up to four optocouplers and special buffers; a costly, large, and relatively complicated technique. Using the LTC4310 simplifies I²C isolation by encoding and transmitting I²C bus signals over an isolation barrier. The signals are decoded and recombined on the other side of the barrier using a second LTC4310 all while maintaining I²C signal integrity. The LTC4310 allows the signals to be bridged by an Ethernet transformer to achieve communications across voltage differences of more than 1500V_RMS, or capacitors can be used for lower voltage differentials. The LTC4310-1 is intended for use in 100kHz standard mode I²C systems while the LTC4310-2 is designed for 400kHz fast mode I²C systems. Compliant logic low thresholds on both sides of the LTC4310 ensure compatibility with other I²C devices while also providing generous noise margins for heavily capacitive busses.