BPW77NA and BPW77NB Series Phototransistors The BPW77NA and BPW77NB series, from Vishay Semiconductor, are a range of silicon NPN phototransistors. They are in hermetically sealed TO-18 packages with a glass lens. The BPW77NA and BPW77NB phototransistors are sensitive to both visible and near IR radiation. They are ideal for use as detectors within electronic control and drive circuits.
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