The A1458 is a . It consists of a Gallium Arsenide (GaAs) infrared emitting diode, optically coupled to a silicon NPN phototransistor. The component is housed in a compact, industry-standard DIP-4 (Dual Inline Package) and is also available in surface-mount (SMD) variants.
Optocouplers have a "Rise Time" and "Fall Time." If you are sending high-speed PWM signals (above 10kHz), check the datasheet for the switching speed to ensure the signal doesn't become distorted.
