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Type 3 surge arrester / silicon-controlled rectifier (SCR) diode array - 3 pF, 15 kV | SP720 series
The SP720 is basically an array of bipolar structures made for the purpose of protection from over-voltage and ESD protection that should be offered to sensitive input circuits. The SP720 offers two diode device structures per unit. There are a total of 14 inputs which are helpful in protecting 14 bus lines or external signals. Over-voltage protection is offered from IN (pins 1-7 and 9-15) to V+ or V-. These SCR structures have been manufactured for the purpose of triggering a threshold of one +VBE diode threshold above V+ (Pin16) or a -VBE diode threshold below V- (Pin 8). If the transient pulse accidentally causes the input to increase a single level greater than one VBE above V+, then from IN input, a clamp to V+ gets activated. A similar situation occurs in case of V- if a negative pulse gets activated to one less than V-.