Part Number: DPC-817C
Function: PHOTOTRANSISTOR / PHOTOCOUPLER
Package: DIP 4 Pin Type
The DPC-817C series are optically coupled isolators containing a GaAs light emitting diode and an NPN silicon phototransistor.
A photocoupler is an electronic component that combines a light-emitting diode (LED) and a photodetector (usually a phototransistor or a photodiode) in a single package. It is used to electrically isolate two circuits while allowing them to communicate optically.
The basic structure of a photocoupler consists of an LED and a photodetector placed within the same package but physically separated by an optically transparent barrier. When current flows through the LED, it emits light that is then detected by the photodetector, creating an electrical signal proportional to the light received.
Applications of photocouplers include:
1. Isolation: It is commonly used to isolate high-voltage and low-voltage circuits in power supplies, motor control, and industrial control systems.
2. Signal transmission: It can transmit digital signals or analog signals between different parts of a circuit, providing noise immunity and preventing ground loops.
3. Voltage level shifting: It can be used to shift voltage levels between different circuits, allowing communication between devices with different voltage requirements.
4. Feedback control: It enables feedback control in circuits where isolation is required, such as in feedback loops for power converters or amplifiers.
1. Current transfer ratio (CTR: 50~600% at IF =5mA, VCE =5V)
2. High isolation voltage between input and output (Viso=5000 Vrms )
3. Creepage distance >7.62 mm
4. Operating temperature up to +110°C
5. Compact small outline package
1. Computer terminals.
2. System appliances, measuring instruments.
3. Registers, copiers, automatic vending machines.
4. Electric home appliances, such as fan heaters, etc, of different potentials and impedances.
5. Signal transmission between circuits