SFH 309-3/4

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Optical sensors make use of optical components to detect and measure light intensity and movement. Phototransistors are an example of optical sensors and are used in various applications including industrial automation, telecommunications, aerospace, and medical diagnostics. SFH 309-3/4 is a phototransistor intended for use in a wide range of applications.

The SFH 309-3/4 is a transmissive phototransistor, which means that it depends on light for its operation. When light hits the two terminals of the device, the base current of the phototransistor increases, resulting in collector current flow. In order to maximize the current flow, the terminal must be oriented perpendicular to the incident light.

The SFH 309-3/4 is a wide-angle phototransistor typically used in applications that require a large range of incident light, such as streetlights or outdoor lighting. It is ideal for use in security systems, automotive applications, indoor lighting, and burglar alarm systems, as well as for ultraviolet detection, photocell applications, and pulse detection. The device is also compatible with commonly used LEDs and infrared emitters. It is available in a variety of packages, including a through-hole TO-220 package, and a surface-mount TSSOP-8 package.

In terms of performance, the SFH 309-3/4 is highly sensitive to light and has a response time of 15 milliseconds. It features a peak sensitivity of 860 nm, and a typical current gain of 10mA/V. The device has a dark current (in the absence of light) of 1 nA, and a low OFF-state voltage of 1.3 V. The device also has a high operating temperature range of -40°C to +125°C.

Apart from its performance, the SFH 309-3/4 is also designed for efficient power consumption. Its quiescent current is very low, usually under 10μA when the device is not exposed to light. The device also has a low standby power, making it suitable for use in battery-powered applications.

In summary, the SFH 309-3/4 is a transmissive phototransistor intended for use in various applications, including security systems, automotive applications, indoor lighting, and burglar alarm systems. The device is highly sensitive to light and has a response time of 15 milliseconds. It is low-power, has a wide operating temperature range and is available in a wide variety of packages, making it suitable for a wide range of applications.

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