AN4068 Datasheet, PDF (42/63 Pages) STMicroelectronics – ST7580 power line communication system-on-chip design guide

Reference design standard tests
AN4068
Figure 32. Common mode disturbance protection - negative disturbance
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Figure 33 describes the protection intervention in the case of differential mode disturbances.
A differential voltage higher than 15 V p-p is clamped by the D1 bi-directional Transil™
diode. D1 is the most robust protection and also the one that is able to absorb most of the
energy of any incoming disturbance.
Figure 33. Differential mode disturbance protection
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Doc ID 022923 Rev 2