The Renesas NEPOC PS9587L1-AX is a single-channel, open-collector output optocoupler in an 8-DIP through-hole package. Its headline rating is 5000Vrms galvanic isolation, backed by a minimum common-mode transient immunity of 15kV/µs — the spec that keeps the data path clean when a motor drive or inverter switches a high-voltage rail. The 10Mbps data rate covers most industrial fieldbus links (Profibus, DeviceNet, RS-485 isolators), and the open-collector output lets you wire-OR multiple signals or translate from 5V logic down to a lower-voltage controller. Supply range is 4.5V to 5.5V on the output side; the input LED forward voltage is 1.65V typical, with a max forward current of 30mA.
Open collector vs push-pull — why it matters for the BOM
An open-collector output requires an external pull-up resistor to Vcc (typically 1kΩ to 10kΩ, depending on bus capacitance and speed). That pull-up adds two passives to the BOM, but it also buys flexibility: you can pull up to a different voltage than the optocoupler's own supply, level-shifting the output to 3.3V or 2.5V logic. The trade-off is slower rise time compared to a push-pull (totem-pole) output, which has a dedicated high-side driver. The PS9587L1-AX's typical rise/fall times of 20ns and 10ns are fast enough for 10Mbps signalling; the 75ns max propagation delay (tpLH/tpHL) sets the timing budget for the loop.
Through-hole 8-DIP — shelf life and storage
The PS9587L1-AX comes in a through-hole 8-DIP package (0.400" body width, 10.16mm pitch). No moisture sensitivity level (MSL) is listed for DIP packages — they are generally not moisture-sensitive, so no bake is needed before reflow or wave soldering.