What is the fine-grained topic of the following text: The theoretic recovery time in the range of 15ns would lead to an allowed maximum frequency of 66.7 MHz – while this, of course, is much too high, parts working with a 400KhZ or a 1MhZ switching frequency do not need to worry when a Vishay ES1B-E3/61T is in place. Only return the topic.
Theoretical recovery time and maximum frequency of Vishay ES1B-E3/61T.