The OP750 and OP755 from Optek are silicon, NPN phototransistors with integrated base-emitter resistors. The base-emitter resistor enhances the phototransistor's low current roll-off characteristic which improves contrast ratio and immunity to background lighting. The integral base-emitter resistor causes the phototransistor to ignore small changes in ambient light while providing sharp turn-on characterisitics in low contrast applications.
For example, the presence of a transparent material or varying shades of grey cause only slight variations in a standard phototransistor's current, while the base-emitter phototransistor's output is a sharply different, easily detectable current difference.
Both devices are offered in side-looking, lateral leaded packages. The OP750 has an external lens, while the OP755 has a counter-sunk lens.
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