A recommended PCB layout for the SFH6136-X017T would be to use a ground plane, keep the signal traces short and away from noise sources, and use a 0.1uF decoupling capacitor between the VCC and GND pins.
To ensure reliable operation in high-temperature environments, it's essential to follow the recommended operating temperature range (up to 125°C), use a suitable thermal interface material, and ensure good airflow around the device.
Although the datasheet doesn't specify a maximum allowable voltage, it's generally recommended to limit the input voltage to 5V to prevent damage to the device.
The SFH6136-X017T is not hermetically sealed, so it's not recommended for use in high-humidity environments. If you must use it in such an environment, consider applying a conformal coating to protect the device.
To troubleshoot issues with the SFH6136-X017T, start by verifying the power supply voltage, checking for proper PCB layout and routing, and using an oscilloscope to monitor the input and output signals.