La description

Innovative circuit protection, power control and sensor solutions from Littelfuse are widely used in automotive and other industries. Founded in 1927, Littelfuse offers a comprehensive portfolio of safe and powerful products to meet every customer’s individual needs. The headquarters are located in Chicago, IL, and the company has manufacturing facilities all over the world.The SP721 is an array of SCR/Diode bipolar structures for ESD and over-voltage protection to sensitive input circuits. The SP721 has 2 protection SCR/Diode structures per input. There are a total of 6 available inputs that can be used to protect up to 6 external signal or bus lines. Over voltage protection is from the IN (Pins 1-3 and Pins 5-7) to V+ or V-.The SCR structures are designed for fast triggering at a threshold of one +VBE diode threshold above V+ (Pin 8) or a –VBE diode threshold below V- (Pin 4). From an IN input, a clamp to V+ is activated if a transient pulse causes the input to be increased to a voltage level greater than one VBE above V+. A similar clamp to V- is activated if a negative pulse, one VBE less than V-, is applied to an IN input.''