SP721

SP721 Data Sheet January 1998 File Number 3590.5 Electronic Protection Array for ESD and Over-Voltage Protection [ /Title (SP721 ) /Subject (Electronic Protection Array for ESD and OverVoltage Protection) /Autho r () /Keywords (TVS, Transient Suppression, Protection, ESD, IEC, EMC, Electromagnet ic ComThe 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 device 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. Overvoltage 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. Standard ESD Human Body Model (HBM) Capability is: Features ESD Interface Capability for HBM Standards - MIL STD 3015.7 . . . . . . . . . . . . . . . . . . . . . . . . . . 15kV - IEC 1000-4-2, Direct Discharge, Single Input. . . . . . . . . . . . . . . . . . . . . . . . 4kV (Level 2) Two Inputs in Parallel . . . . . . . . . . . . . . . . 8kV (Level 4) - IEC 1000-4-2, Air Discharge. . . . . . . . . . 15kV (Leve...