Dual-channel capacitive isolator with 3500Vrms barrier
The Maxim Integrated MAX22518AWA+ is a dual-channel digital isolator using capacitive coupling technology to provide galvanic isolation across a 3500Vrms barrier. It supports a data rate of 1Mbps with unidirectional channel configuration (2 inputs on side 1, 0 on side 2).
Industrial temperature range and propagation delay
Propagation delay is 130ns max (both tpLH and tpHL), with pulse-width distortion held to 20ns max — tight enough for most SPI and UART isolation links at 1Mbps. Rise and fall times are symmetrical at 20ns typical, which keeps signal integrity clean without excessive edge-rate ringing.
Common-mode transient immunity — 50kV/µs
The common-mode transient immunity (CMTI) is rated at 50kV/µs typical, a key parameter when the isolator sits across a switching power stage or inverter bridge. Fast voltage slew rates on the isolated side can couple through parasitic capacitance and corrupt data; a 50kV/µs CMTI means the part holds its logic state through those edges. For motor-drive or solar-inverter designs, this rating is what keeps the communication link reliable.