LTR-309

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The LTR-309 is an integrated optical sensor made by Hamamatsu Photonics and is categorized as a type of phototransistor. Primarily used for angular and rotary motion sensing, the LTR-309 is particularly suited for applications such as sensing the position of an encoder, measuring the speed of a small motor, or detecting angular displacement of an object.

The LTR-309 consists of a three pin package containing both a phototransistor and an infrared light emitting diode (LED). The LED emits an infrared light when the LED pin is given a forward bias voltage. The phototransistor detects any infrared light that falls on its surface and emits an electric current that is proportional to the energy of the incident infrared light. Thus, when the LED is given forward bias, it emits an infrared light and the current from the phototransistor increases as the LED angle with respect to the phototransistor changes.

The versatility of the LTR-309 makes it an optimal sensing element for many motion sensing applications. The small form factor of the OSLON Black (the package in which the LTR-309 is contained) ensures that it can be easily used in many types of product designs. Furthermore, the low power consumption of 0.6mA with a supply voltage of 5V makes it an ideal choice when a device requires very low power consumption. Additionally, the LTR-309’s linear response to angular position over a wide angular range of -50 to +50 degrees makes it ideal for use in products that require precise angular measurements such as optical rotary encoders.

The LTR-309’s three pin package makes it simple to use and the supply voltage of 5V makes it usable with most integrated circuit designs. Additionally, the phototransistor’s integrated LED makes it very easy to set up and align with a target object for use in an optical rotary encoder application. The phototransistor’s response is linear over its entire sensing range and has a high sensitivity to infrared light, making it particularly suitable for rotational speed measurement of small motors. It also has very low compensation capacitance, making it ideal for use in AC couple circuits.

In conclusion, the LTR-309 is a great choice for angular and rotary motion sensing in a wide range of applications. Its small form factor and low power consumption make it the perfect choice for any application that requires accurate measurement over a wide range of angles. The integrated LED allows for easy set up and alignment and the phototransistor has a linear response and high sensitivity to infrared light, making it particularly suitable for rotational speed measurement of small motors.

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