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ESDS304: ESDS304DBVR used with UART Transceiver

Part Number: ESDS304
Other Parts Discussed in Thread: MAX3232, TPD2E007


I am using ESDS304DBVR ESD diode for Max 3232 UART transceiver o/p pins TX and RX at the connector end.

and with this ESD diode i am not able to detect the device or communicate.

Once this ESD diode is removed, Max3232 ckt works fine. please let me know why and also suggest other ESD diodes if the one used here is incorrect.