SI88640ED-IS

Digital isolators are electromechanical devices that provide complete galvanic optical isolation between two circuits that operate at different electrical potentials. SI88640ED-IS is a highly efficient and reliable digital isolator with integrated electrostatic discharge protection (ESD) that helps protect electronic circuits in a wide variety of industrial and consumer applications. This paper describes the application field and working principle of the SI88640ED-IS digital isolator.

The SI88640ED-IS has an isolation level of 6 kV per application, with an integrated input-output ESD protection of up to 8 kV for human body model (HBM) and 3 kV for machine model (MM). It also has an approval to the UL 60730 specifications, making it suitable for use in safety-critical applications. Thus, the SI88640ED-IS digital isolator is suitable for use in a wide range of commercial and industrial applications, such as medical equipment, factory automation, railway systems, power utilities, home appliances, lighting systems, and automotive electronics.

In terms of working principle, the SI88640ED-IS digital isolator works by utilizing an optically-coupled transistor pair to provide complete electrical isolation between the input and the output circuits. The optically coupled components act as a current source and an effective switch that operate in response to light. This allows the device to transfer signals between the two circuits at a very low power level. The optically coupled devices also have a very wide bandwidth, allowing a fast transmission of signals between input and output. The isolation of the device is provided by a metal-to-metal construction that completely shields the internal components from external interference.

The SI88640ED-IS digital isolator is designed with an ESD protection circuit that helps protect the device from shock or voltage spikes, which can cause permanent damage to the device. The ESD protection is provided by an ESD protection FET, which is connected to the input and output circuits. The ESD protection FET is designed to suppress any voltage spikes, allowing the device to continue to function even in the event of an external power failure. This helps ensure that the device will be protected from any unexpected power surges that may occur in the system.

The SI88640ED-IS digital isolator is also designed with low propagation delay, enabling the device to quickly transfer digital data or signals between input and output circuits without any noticeable delay. The device is also designed to provide excellent values for typical pulse width distortion and data jitter, making it suitable for high speed digital applications.

In summary, the SI88640ED-IS digital isolator is a highly efficient and reliable digital isolator with 6 kV isolation level and an integrated input-output ESD protection of up to 8 kV for human body model (HBM) and 3 kV for machine model (MM). It is suitable for use in a wide range of commercial and industrial applications, and its optically coupled design allows for fast signal transmission between input and output circuits. The ESD protection circuit helps protect the device from unexpected voltage spikes, and its low propagation delay and excellent values for typical pulse width distortion and data jitter make it suitable for use in high speed digital applications.