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Did ever bought this phototransistor from Alexan and search for the datasheet on the internet? Chances are you would have a hard time finding the manufacturer website and even the datasheet for this transistor. The WPT-440F phototransistor is an OEM phototransistor sourced by Alexan from a third party.  These are the specifications of the WPT-440F Phototransistor that we have gathered from the Zilog Website http://www.zilog.com/docs/z8encore/appnotes/an0183.pdf

Alexan WPT440F IR Photo Transistor