Description
The OPB680 consists of an NPN phototransistor and an infrared emitting diode in a molded plastic housing. The phototransistor has an enhanced low current roll-off which improves contrast ratio and immunity to background irradiance. A lever arm actuated flag interrupts the light beam, switching the output between states that can readily drive logic gates. The lever can be actuated by a passing paper sheet without damaging the paper edge.
The OPB680-20 has the same features as the OPB680 with an increased lever operating force. This feature prevents false triggering due to incidental contact in door sensing and other heavy duty applications.
Customized lever arms and additional spring torques can be designed for specific applications.

Features
• Phototransistor output
• Mechanical switch replacement
• Printed circuit board mounting
• Enhanced signal to noise ratio
• Lever force options