The maximum allowable voltage that can be applied to the input pins is 5V, as exceeding this voltage can cause damage to the internal LED.
To ensure reliable operation in high-temperature environments, it's essential to derate the device's current and voltage ratings according to the temperature derating curve provided in the datasheet.
The recommended input current for the 4N28 is 10mA to 20mA, as this range provides optimal performance and reliability.
While the 4N28 can be used for high-frequency applications, its bandwidth is limited to around 10kHz. For higher frequencies, consider using a faster optocoupler like the 4N35 or 4N36.
To choose the correct resistor value for the input LED, use the formula R = (Vcc - 1.2) / If, where Vcc is the supply voltage, and If is the desired forward current.
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