1458 Optocoupler Datasheet [2021]

Note: There is no industry-standard optocoupler with the primary designation "1458." The "1458" is famously a dual operational amplifier (e.g., LM1458, UA1458). This paper addresses that ambiguity, clarifies the likely confusion, and provides a rigorous methodological framework for analyzing an optocoupler datasheet, using a real, similar device (e.g., 4N35) as a practical example.

Military & Aerospace: Due to its hermetically sealed package, it is often selected for environments where moisture or contaminants would degrade standard plastic packages. Distinguishing the 1458 Family 1458 optocoupler datasheet

Specifications of the 1458 Optocoupler

IF vs. VF (LED Current vs. Voltage): This helps you calculate the exact current-limiting resistor. If your VCC is 5V, and VF is 1.3V at 10mA, the resistor is (5-1.3)/0.01 = 370 ohms (use 330 or 390 standard).
Normalized CTR vs. IF: This shows that running the LED at 1mA might give only 30% of the rated CTR. For reliable switching, run the LED between 5mA and 20mA.
CTR vs. Ambient Temperature: At -25°C, CTR might be 80% of nominal. At 85°C, it could drop to 50%. Always derate your design for the highest temperature your product will see.