600 Mbps LVDS isolator with reinforced isolation
The Analog Devices ADN4651BRWZ is a two-channel, unidirectional LVDS digital isolator from the iCoupler® family, built on magnetic coupling technology. It delivers a 600 Mbps data rate per channel with a 4.5ns propagation delay, making it suitable for high-speed serial links where galvanic isolation is required. The 5000 Vrms isolation rating and 25 kV/µs common-mode transient immunity (CMTI) target industrial motor drives, inverter systems, and medical equipment where fast voltage transients and safety isolation are design constraints.
5000 Vrms isolation — what it buys you
The 5000 Vrms isolation voltage is a reinforced-grade rating, not basic isolation. That matters when the isolator sits between a 2.5V LVDS controller and a high-voltage domain in motor drives, grid-tied inverters, or patient-connected medical electronics. The 25 kV/µs CMTI ensures the data link stays intact when a fast common-mode transient — say from an IGBT switching event — slams across the isolation barrier. At 0.35ns rise and fall times, the edges are clean enough for 600 Mbps signaling without excessive jitter, but the fast edges also mean the PCB layout around the SOIC-20 footprint needs controlled impedance traces and a solid ground plane under the isolation gap.
2.5V supply rail — not a 3.3V part
The ADN4651BRWZ runs on a 2.375V to 2.625V supply — a tight 2.5V ±5% rail. This is not a generic 3.3V or 5V isolator; it is designed specifically for LVDS signal chains that operate at 2.5V. If your system already has a 2.5V rail for the LVDS transceiver, this part drops in. If you are trying to interface with a 3.3V logic domain, you will need level translation on the input side or a different isolator variant. The unidirectional channel configuration (one input on side 1, one input on side 2) supports a single LVDS pair in each direction, which matches point-to-point links where the data flow is known at design time.
Active lifecycle and compliance
For dual-sourcing flexibility, the ADN4651BRSZ-RL7 is a functional peer with the same 600 Mbps data rate and 1/1 input configuration but rated at 3750 Vrms isolation in a smaller package variant — a trade-off of isolation voltage for board area when 5000 Vrms is not required.