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 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. Standard ESD Human Body Model (HBM) Capability is:
The SP721 TVS diode array consists of six SCR/diode pairs, each input having two protection structures. It offers fast triggering, low input leakage (1 nA at 25 °C), low capacitance (3 pF typical), and a 2 ns rise time, making it suitable for protecting sensitive microprocessor, logic, data‑bus and analog inputs.
Typical applications include microprocessor/logic input protection, data‑bus protection, and analog device input protection. The device is supplied in lead‑free green PDIP and SOIC packages and complies with RoHS. It meets HBM (≥15 kV air discharge) and IEC 61000‑4‑5 peak‑current specifications.
| Peak Pulse Current (8/20µs) | ±3 A |
|---|---|
| Operating Temperature Range | -40 °C to 105 °C |
| Input Capacitance | 3 pF typical |
| Rise Time | 2 ns |
| Number of Inputs | 6 |
The device has six inputs, each with two SCR/diode structures, allowing protection of up to six external signal lines.
The SP721 operates from –40 °C to 105 °C.