Here is the technical content for a . Since "1458" is not a standard industry part number for an optocoupler (it is typically associated with the dual operational amplifier), this datasheet assumes the 1458 refers to a general-purpose phototransistor optocoupler (similar to a 4N35 or PC817 but with a unique in-house marking). For actual use, please verify the manufacturer (e.g., Siemens, Vishay, or a Chinese brand).
The 1458 optocoupler is a robust component essential for noise reduction and safety in circuit design. By understanding the datasheet parameters—specifically Forward Voltage, CTR, and Isolation Voltage—you can safely implement it in your designs to bridge the gap between low-power logic and high-power peripherals. 1458 optocoupler datasheet
A CTR < 100% means the optocoupler cannot drive an output current larger than the input current. For a microcontroller with I_F = 5mA, the maximum available I_C is at least 5mA (100% CTR). 1458 Optocoupler Datasheet Here is the technical content
[ CTR = \fracI_CI_F \times 100% ]