The SP720 is an array of SCR/Diode bipolar structures for ESD and over-voltage protection to sensitive input circuits. The SP720 has 2 protection SCR/Diode device structures per input. A total of 14 available inputs can be used to protect up to 14 external signal or bus lines. Over-voltage protection is from the IN (pins 1-7 and 9-15) to V+ or V-. The SCR structures are designed for fast triggering at a threshold of one +VBE diode threshold above V+ (Pin 16) or a -VBE diode threshold below V- (Pin 8). From an IN input, a clamp to V+ is activated if a tran- sient 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:
The SP720 TVS diode array from Littelfuse offers protection for up to 14 external signal or bus lines using two SCR/Diode structures per input. It is designed for fast triggering and can clamp transient over‑voltage pulses to the supply rails.
Key specifications include an operating voltage range of 2 V to 30 V, peak pulse currents of 2 A (PDIP) or 6 A (SOIC) for 100 µs pulses, input leakage as low as 20 nA, and an ESD HBM rating greater than 15 kV. The device operates from –40 °C to 105 °C and is supplied in lead‑free PDIP and SOIC packages.
| Operating Voltage Range | 2 V to 30 V |
|---|---|
| Peak Pulse Current (SOIC) | 6 A, 100 µs |
| Input Leakage Current | 20 nA (typ) |
| Operating Temperature Range | -40 °C to 105 °C |
| Number of Protected Inputs | 14 |
The device can protect up to 14 external signal or bus lines, using two SCR/Diode structures per input.