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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 device structures per input. There are a total of 6 available inputs that can be used to protect up to 6 external signal orbus 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.
- ESD Interface Capability for HBM Standards
- MIL STD 3015.7 ....................................15kV
- IEC 61000-4-2, Direct Discharge,
- Single Input............................................4kV (Level 2)
- Two Inputs in Parallel..............................8kV (Level 4)
- IEC 61000-4-2, Air Discharge..................15kV (Level 4)
- High Peak Current Capability
- IEC 61000-4-5 (8/20µs)..........................±3A
- Single Pulse, 100µs Pulse Width...............±2A
- Single Pulse, 4µs Pulse Width..................±5A
SP721 Parts
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Filters
SP721 Applications
- Microprocessor/Logic Input Protection
- Data Bus Protection
- Analog Device Input Protection
- Voltage Clamp
