PC817 4-Channel Optocoupler Isolation ModuleSpecificationsCore ComponentsOptocouplers: 4 × PC817 optocoupler(Each contains an infrared LED phototransistor for signal isolation)PurposeProvides electrical isolation between the input and output sidesProtects microcontrollers and sensitive circuits from noise, high voltage, or spikesCommonly used for isolating:Digital signalsControl signalsCommunication linesElectrical Characteristics (Typical, per Channel)Input (LED) Forward Voltage: ~1.2 VInput Forward Current: max ~20 mAOutput Phototransistor Collector‑Emitter Voltage: max ~30–35 VCurrent Transfer Ratio (CTR): typically 20%–50%Module InputChannels: 4 isolated input channelsSignal Type: digital (logic/TTL)Inputs from microcontrollers (5V logic) or other driving circuitsOften includes input current‑limiting resistors on boardModule OutputsOpen‑collector phototransistor outputs (active when the input LED is driven)Typically requires an external pull‑up resistor on the output side (sometimes included on board)Power and SupplySome variants may require a module VCC to power pull‑upsInput and output sides are galvanically isolatedIsolation voltage rating (between input and output):Typically ≥ 3 kV (3000 V) (depends on board design)InterfaceStandard 2.54 mm (0.1″) header pinsTypical pin layout:4x Inputs (IN1–IN4)4x Outputs (OUT1–OUT4)GND / VCC (depending on version) SKU: LKMOD00169 Category: Module
