HCPL2731S

Series:	--
Packaging:	Tube
Part Status:	Active
Number of Channels:	2
Voltage - Isolation:	2500Vrms
Current Transfer Ratio (Min):	500% @ 1.6mA
Current Transfer Ratio (Max):	--
Turn On / Turn Off Time (Typ):	300ns, 5µs
Rise / Fall Time (Typ):	--
Input Type:	DC
Output Type:	Darlington
Voltage - Output (Max):	18V
Current - Output / Channel:	60mA
Voltage - Forward (Vf) (Typ):	1.3V
Current - DC Forward (If) (Max):	20mA
Vce Saturation (Max):	--
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SMD, Gull Wing
Supplier Device Package:	8-SMD

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HCPL2731S Application Field and Working Principle
Optoisolators - Transistor, Photovoltaic OutputThe HCPL2731S is a versatile optically isolated TTL/CMOS compatible line driver manufactured by Avago Technologies. This device contains a photovoltaic output transistor that provides one of the most advanced solutions for isolated logic and analog signal transmission. This optoisolator design is suitable for signal isolation between controllers, switches and sensors and has wide-ranging applications in the automotive, industrial, medical, communications and military fields.The working principle of an optoisolator is based on the principle of electromagnetic induction. A light-emitting diode (LED) and a photosensitive transistor are used to accomplish the coupling of two circuits. The LED is usually connected to a power source and emits infrared light when it passes a certain threshold voltage. The photosensitive transistor senses the infrared light and produces electrical signals. These signals are then amplified and passed on to the other circuit.The HCPL2731S is a high-speed optocoupler which utilizes the HCPL7800, an optoelectronic device that consists of an LED for optical power transfer and a photosensitive transistor for electrical power transfer. The LED emits light in the near-infrared spectrum with a peak wavelength of 850nm. The output transistor provides an output at 15 volts (open collector) and is capable of driving up to 500mA. The optocoupler incorporates a Schmitt trigger input, providing increased noise immunity and reduced propagation delay.The HCPL2731S optoisolator is designed to be used in systems that require high-speed transmission of digital signals with minimal distortion and high voltage isolation. Its unique design ensures maximum transmittance of high-frequency input signals across a wide-range of voltage and current levels. The optoisolator can also be used to protect delicate circuitry from voltage spikes and noise generated in an adjacent circuit by providing electrical and optical isolation.The HCPL2731S optoisolator is a widely used device due to its flexibility and affordability. It is used in a variety of applications like digital communications, industrial control systems, noise suppression, and digital logic signal transmission. It is also used in motor control, signal conditioning and protection circuits. Its wide range of features makes it a perfect choice for applications where optical isolation is required. Even though it has a relatively narrow operating current range (5.2mA to 7.5mA for LED forward current), its performance in comparison to other optoisolators is considered good.In conclusion, the HCPL2731S is an advanced optoisolator providing fast and reliable optical isolation of digital signals with low distortion. Its unique design ensures maximum transmission of high-frequency electrical signals, as well as providing adequate protection against voltage and noise. The device is widely used in various applications including digital communications, motor control, signal conditioning and protection circuits. The device is available at low costs and provides many advantages over other optoisolator designs.

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