We are using USBUF01W6 as EMI filter for STM32F207VCT6 in USB D+ and D- lines in Full speed mode and we have connected VBUS (5V) at pin 3.3V pin of USBUF01W6.
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NOTE: This question and answer originated from a customer support case which was handled by us. We regularly review support cases and add any helpful ones here for all to benefit from.
As STM32 used already includes series resistors for USB D+ and D-, the right part to protect against ESD on D+ and D- is USBLC6-2SC6, instead of USBUF.
In addition, you should consider to protect 5V_USB against ESD and EOS transients (8/20µs). We recommend to use ESDA7P60-1U1M or ESDA7P120-1U1M. In this case, VBUS of USBLC6-2SC6 is connected to a 100nF capacitor or left open.
For best protection these parts should be placed as close as possible to the connector.
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