Circuit Protection of SCART Interface

Design Notes:
Protection Application:
In the SCART interface, there are 12 signal and control lines to be protected against ESD. The signals used include video (up to 5 MHz and 2.0Vp-p), audio (up to 30 kHz and 12Vp-p) and control (up to 3 MHz and 12V). For the video and control lines, the capacitance of the suppress should be taken into account.
Solution Description:
As shown at the left, discrete multilayer varistors can be used for board layout flexibility. These parts will meet the capacitance requirements for the video and control lines, as well as the stand-off voltage requirement for the audio lines.
Companion Solutions:
Other solutions within the Ruilon portfolio exist in addition to these recommendations. For example, if arrays were preferred for part count reductions, products like the SP723ABT should be considered.
Regulatory Issues:
The IEC 61000-4-2 will be the most appropriate standard that applies for this port. It supplies a test method for verifying that the end product is not susceptible to ESD events.
Unique Features:
Does not apply.
Application Warnings:
Does not apply.

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