15 Mbps push-pull optocoupler with 2500 Vrms isolation
The Renesas PS9851-2-F3-AX is a dual-channel digital optocoupler from the NEPOC series, delivering 15 Mbps data rate with push-pull totem-pole outputs. It provides 2500 Vrms galvanic isolation between input and output sides, with a common-mode transient immunity of 10 kV/µs — enough to reject fast switching edges in motor-drive or inverter environments. The 60 ns max propagation delay keeps timing margins tight for isolated SPI, CAN, or encoder interfaces.
Dual-channel vs single-channel: which NEPOC optocoupler fits?
The PS9851-2-F3-AX is the dual-channel variant in the PS9851 family. Its single-channel sibling, the PS9851-1-F3-AX, shares the same 15 Mbps data rate, push-pull output, and 2500 Vrms isolation, but in a single-channel 8-pin package. If the design needs two isolated digital paths — say, TX and RX for an isolated UART — the dual-channel part saves board space and per-channel cost versus using two single-channel devices. The PS9821-2-F3-AX is a dual-channel NEPOC part with open-collector output (25 mA sink) and slightly slower 75 ns propagation delay, better suited for driving relays or optocoupler inputs rather than high-speed digital buses.
Active lifecycle, ROHS3, and sourcing posture
It is a current-production part from Renesas's NEPOC series, available through independent distribution.