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Phototransistors are photodiode-amplier combinations integrated within a single silicon chip.
e phototransistor can be viewed as a photodiode whose output current is fed into the base of a
conventional transistor.
ese photodiode-amplier combinations are put together to overcome the major limitation of
photodiodes: unity gain. e typical gain of a phototransistor can range from 100 to over 1500.
Many applications demand a greater output than can be generated by a photodiode alone. Even
though the signal of a photodiode can be amplied through external circuitry (operational
amplier for example) this is not always cost eective. In such cases, phototransistors provide a
lower cost alternative.
PHOTO
TRANSISTORS
FOR INDUSTRIAL AND
COMMERCIAL
APPLICATIONS
-
Phototransistors
V Series – CR Series
Phototransistors – VTT Series – CR Series
Figure 1
Package Drawing – VTT Series – T-1¾ Package
• Coin counters
• Position sensors
• Remote controllers
• Ambient light sensing
• Street light switching
• Oil burner ame monitoring
• Safety shields
• Margin control-printers
• Monitor paper position and stack height
• Low cost visible and near IR photo detection
• Low dark current
• Available in package with integrated
visible ltering
• Available in package with integrated
IR ltering
• Available in a wide range of packages
• RoHs compliant
CR50TE
• Surface mounting device
• Solid state ceramic chip
• High thermal conductivity
• Special type (CR50TE-DLF)
with daylight lter on request
