
PT91-21B/TR7 Sensors, Transducers |
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Allicdata Part #: | 1080-1393-2-ND |
Manufacturer Part#: |
PT91-21B/TR7 |
Price: | $ 0.06 |
Product Category: | Sensors, Transducers |
Manufacturer: | Everlight Electronics Co Ltd |
Short Description: | PHOTOTRANS 1.9MM RND BLACK GWING |
More Detail: | Phototransistor 940nm Top View 2-SMD, Gull Wing |
DataSheet: | ![]() |
Quantity: | 1000 |
1 +: | $ 0.06000 |
10 +: | $ 0.05820 |
100 +: | $ 0.05700 |
1000 +: | $ 0.05580 |
10000 +: | $ 0.05400 |
Series: | -- |
Packaging: | Tape & Reel (TR) |
Part Status: | Active |
Voltage - Collector Emitter Breakdown (Max): | 30V |
Current - Collector (Ic) (Max): | 20mA |
Current - Dark (Id) (Max): | 100nA |
Wavelength: | 940nm |
Viewing Angle: | -- |
Mounting Type: | Surface Mount |
Orientation: | Top View |
Operating Temperature: | -25°C ~ 85°C (TA) |
Package / Case: | 2-SMD, Gull Wing |
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Optical Sensors – Phototransistors are passive photodetectors composed of a semiconductor junction, where the base-emitter junction is reverse biased and exposed to an optical signal, such as light or infrared radiation. When a photon enters the base-emitter junction, it gives up its energy, creating an electron-hole pair. This then stimulates current flow from emitter to collector, producing an output voltage which is proportional to the optical signal.
PT91-21B/TR7 is one such optical sensor, a Bipolar Transistor Phototransistor. This device offers a wide operating temperature range (–40 °C to +85 °C). It also has a low dark current and high isolation voltage. The low dark current reduces the thermal noise and the high isolation voltage allows for a wide dynamic range.
PT91-21B/TR7 has a maximum collector current of 1mA and saturation voltage of 0.2V at 1mA. The peak spectral response is approximately 550nm, with an active area of 33.5mm2, providing improved sensitivity. The product features an integrated package, which eliminates the need to use a separate resistor and/or transistor for each optical sensing application.
One common application of the PT91-21B/TR7 sensor is to measure light strength in outdoor areas. This can be done by connecting the sensor to an analog-to-digital converter (ADC). A signal is sent from the ADC to a microcontroller, which can then process and convert the signal to obtain light strength values. The data can then be used for numerous purposes, such as controlling lighting levels or detecting environmental changes.
Another common application of the PT91-21B/TR7 sensor is in motion detection. Here, the sensor is used to detect changes in light levels. When motion is triggered, the sensor sends an analog signal to the ADC, which is then converted to a digital signal and sent to the microcontroller. The microcontroller can then take appropriate action, such as turning on lights or sounding an alarm.
In addition to the above applications, the PT91-21B/TR7 can also be used in a variety of industrial and medical applications. It can be used to detect changes in temperature, pressure, humidity and distance. It can also be used to detect hazards in industrial settings. In the medical field, the sensor can be used to detect body temperature. All of these applications utilize the same basic principles of the PT91-21B/TR7, which makes them ideal for multi-purpose use.
In conclusion, the PT91-21B/TR7 is a versatile optical sensor. It can be used in a variety of applications and provides reliable results. Its wide temperature range and high isolation voltage make it an ideal choice for many applications. With its integrated package and wide spectral range, the PT91-21B/TR7 is an excellent choice for any optical sensing application.
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