Optocoupler Datasheet | A1458
Over years of continuous use, the internal LED will slightly dim, effectively lowering the CTR. Design your circuit with a bit of "headroom" (using a higher current than the bare minimum) to account for aging. Conclusion
When PLC output is high (24V), LED turns on, phototransistor conducts, output pin pulled low. When PLC output low, LED off, output pulled high by R2. a1458 optocoupler datasheet
The HCPL-1458 is designed for high-performance signal isolation in demanding environments. Over years of continuous use, the internal LED
The A1458 typically comes in an or SO-8 (SOP-8) surface-mount package. The standard 8-pin logic-gate optocoupler pinout is as follows: Pin 1: No Connection (NC) Pin 2: Anode (Input LED) Pin 3: Cathode (Input LED) Pin 4: No Connection (NC) Pin 5: Ground ( GNDcap G cap N cap D Pin 6: VOUTcap V sub cap O cap U cap T end-sub (Output Signal) Pin 7: VEcap V sub cap E (Enable Pin, sometimes used for logic control) Pin 8: VCCcap V sub cap C cap C end-sub (Supply Voltage) Key Features & Advantages When PLC output low, LED off, output pulled high by R2
Features a GaAsP LED input and an integrated high-gain photodetector with an open collector output. Common Applications