Robust Protection Device for Electrostatic Discharge/Electromagnetic Interference in Industrial Interface Applications

A new silicon-controlled rectifier (SCR) fabricated in a 30-V mixed-signal CDMOS (CMOS/DMOS) technology is presented. This device allows for robust electromagnetic interference (EMI) and electrostatic discharge (ESD) voltage clamp for high-speed industrial interface applications operating in variable voltage swing range (e.g., from -7 to +12 V). The device robustness is demonstrated under different pulsewidths, stress, and temperature. Analysis of the device physics is complemented via mixed-mode numerical simulations. The $\text{200} \times \text{200}\ \mu\textrm{m}^{2}$ device designed in an annular configuration achieves > ±8 kV IEC robustness and low clamping voltage at ± 20 A.