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Hello, Please ask a question about PC817 Datasheet

# Example questions: ➢ Referring to figure 11, what parameters are represented by 'ts', 'td', and 'tf' in the frequency response graph, and what do they generally indicate about the transistor's performance?
➢ What is the approximate collector-emitter saturation voltage at an ambient temperature of 25°c with a forward current of 20ma?
➢ How does the relative current transfer ratio change as the ambient temperature increases?