If you have a component mislabeled as a "1458 optocoupler" in your BOM, here is what it is actually used for:
When an external control circuit applies current to Pins 1 and 2, the internal GaAs IR LED glows. The brightness of the light is directly proportional to the forward current ( IFcap I sub cap F
To get the official datasheet for your specific component, search directly for its full part number: 1458 optocoupler datasheet
Ideal for low-voltage, energy-efficient designs.
Output signal terminal (often open-collector or logic output) No Connection Pin 8 VCCcap V sub cap C cap C end-sub Supply Voltage input (3.0 V to 5.5 V) If you have a component mislabeled as a
Before you can use the device, you need to understand how to connect it. The datasheet will provide a pinout diagram and a functional block diagram showing the internal workings.
(Pin 6) and (Pin 4) to your isolated power supply. Note: Always place a small decoupling capacitor (e.g., ) close to the VCCcap V sub cap C cap C end-sub pin to filter out high-frequency noise. The datasheet will provide a pinout diagram and
If you are looking for drop-in equivalents or similar logic-gate optocouplers, you might consider: HCPL-2200 / Go to product viewer dialog for this item.
The output stage is an open collector, providing flexibility in designing the output interface. HCPL-1458 Pinout and Functional Description