1458 Optocoupler Datasheet [updated]

CTR is the ratio of output collector current to input forward current, expressed as a percentage:

An infrared LED that converts an electrical signal into light. Output Side: 1458 optocoupler datasheet

In the electronics industry, "1458" is also a very common designation for the or LM1458 . However, these are Dual Operational Amplifiers , not optocouplers. If your component is an 8-pin IC used for signal amplification rather than isolation, you are likely looking for the MC1458 Datasheet . MC1458 - STMicroelectronics CTR is the ratio of output collector current