I²C bus isolator with magnetic coupling
The LTC4310CMS-2#PBF is a two-channel, unidirectional digital isolator from Analog Devices, purpose-built for I²C buses. It uses magnetic coupling to isolate the serial clock (SCL) and serial data (SDA) lines, with one channel per direction — side 1 to side 2 and side 2 to side 1. The data rate is rated at 400 kHz, which covers standard I²C fast mode but not high-speed mode (3.4 MHz). Supply voltage spans 3V to 5.5V, so it works directly on both 3.3V and 5V I²C domains without a level shifter.
20 kV/µs CMTI — why it matters for noisy environments
Common-mode transient immunity is specified at a minimum 20 kV/µs. That's the isolator's ability to reject fast voltage spikes between the two ground domains — think motor drives, inverter stages, or any system where a high dV/dt event can couple into the I²C lines. A lower CMTI part would risk data corruption or latch-up in those conditions. This rating makes the LTC4310 a solid pick for isolating a microcontroller's I²C port from a noisy power stage or a remote sensor module.
That limits this part to indoor, temperature-controlled environments: lab equipment, benchtop instruments, office peripherals, consumer electronics, and similar. If your design needs to live in an engine bay, a rooftop telecom enclosure, or a factory floor without climate control, you'll want an industrial-temperature isolator (-40°C to 85°C or wider).
Package and hand-solderability
It's hand-solderable with a decent iron and a fine tip — the 0.5 mm lead pitch is manageable for a maker or rework tech. No exposed pad, so no thermal-via stencil required. The part ships in a Tube, so if you're ordering a handful for a prototype, you won't get a whole reel.
Lifecycle and sourcing
It's also ROHS3 compliant, so no conflict with lead-free assembly requirements.