Product information "VTT9812FH / VTT9814FH IR-blocking Silicon Phototransistors"
450-700 nm; Peak Spectral Response 585 nm; Active Area 0.192 mm2; Dark Current ≤50 nA; Short Circuit Current 60-120 µA; Sensitivity 7 A/W Typ.
Excelitas’ VTT9812FH and VTT9814FH are silicon phototransistors in an infrared-blocking, flat T 1¾ end-looking package. These phototransistors provide an excellent response in the visible spectral range.
Phototransistors are photodiode-amplifier combinations integrated within a single silicon chip. The phototransistor can be viewed as a photodiode whose output current is fed into the base of a conventional transistor. These photodiode-amplifier combinations are put together to overcome the major limitation of photodiodes: unity gain. The typical gain of a phototransistor can range from 100 to over 1,500.
Many applications demand a greater output than can be generated by a photodiode alone. Even though the signal of a photodiode can be amplified through external circuitry, this is not always cost effective. In such cases, phototransistors provide a lower cost alternative.
The VTT9812FH and VTT9814FH include the time-proven VTT silicon phototransistor chip family that customers have come to rely upon over the years, with the additional IR-blocking feature incorporated in the plastic epoxy package. As such they give an excellent response in the visible spectral range (450 to 700 nm), giving a RoHS-compliant alternative to Cadmium Sulphide photocells.
The VTT9812FH is designed for dusk/dawn switching at low light levels around 0.2 to 1 fc (2 to 10 lux).
With a narrow light current tolerance, the VTT9814FH is especially suited for ambient light control applications around 50 to 100 fc (500 to 1,000 lux).
Visible Light Response With IR Blocking Feature Incorporated in the Casting Epoxy
Low Dark Current: Max. 50 nA at 5 V VCE
RoHS-compliant Alternative to Photocells
Active Area = 0.192 mm2
Short Circuit Current = Min. 60 µA (VTT9812FH), 80 µA (VTT9814FH), Max. 120 µA at 100 fc, 2,850 K
Spectral Range = 450 nm to 700 nm
Peak Spectral Response = 585 nm
Sensitivity at Peak Wavelength = 7 A/W Typ.
Angular Response = ±50° at 50% Response
Soldering Temperature = Max. +260 °C
Applications: Street Light Switching; Interior and Exterior Light Control (Dusk/Dawn Switch); Automotive Headlight Dimmer; Display Contrast Control; Energy Conservation
IR-blocking Silicon Phototransistors
Manufacturer Series Name:
VTT9812FH / VTT9814FH
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