A good PCB layout for the 6N139-300E should minimize the distance between the LED and the photodiode, and ensure that the LED anode is connected to a low-impedance power supply. A ground plane under the device can also help reduce noise.
To ensure reliable operation over the full temperature range, ensure that the device is operated within the recommended voltage and current ranges, and that the PCB is designed to minimize thermal gradients. Additionally, consider using a thermally conductive material for the PCB substrate.
The recommended input current for the LED is 10mA to 20mA. Operating the LED at higher currents can reduce its lifespan, while operating at lower currents may reduce the output current of the photodiode.
To minimize EMI, ensure that the PCB layout is designed to minimize loop areas and that the device is placed away from noise sources. Additionally, consider using shielding or filtering to reduce EMI.
The typical propagation delay of the 6N139-300E is around 10-20 microseconds. This delay is due to the time it takes for the light to travel from the LED to the photodiode.
