Part Number: ESDS552 Tool/software: Question on ESDS552DBZR part
Below id my understanding on pin mapping
PNI-1 SIGNAL1
PIN-2 SIGNAL2
PIN-3 GND
Can I leave PIN2 as unconnected / NC in the schematics? If no, what is recommended. Mine is single channel…
Hi Chase,
Thanks for sharing the datasheet. I would recommend a working voltage of 12V instead of 5V, which Clemens explains well. I might recommend ESDS552 as TI's RS-485 ESD diode. It is a 2 channel device (so only one is needed for RS485) with 30kV…
Hi Ryu,
THVD1450 is only rated and tested for IEC 61000-4-2 and 4-4, but not 4-5. We cannot guarantee anything outside what is specified in the datasheet. Normally I recommend ESDS552 as an external protection diode that protects up to 25A surge current…
Hi Jimmy,
It is correct that TVS diodes are for short transient events. Long sustained shorts will likely break the diode. The SMAJ30CA was recommended for short to battery conditions that were for brief periods of time. If you do not anticipate a short…
Hi Jiaqi,
The SN75176A does not have any internal ESD protection. It is recommended that external protection devices such as the ESDS552 be added to the design. This device has affordable 30kV IEC 61000-4-2 ESD protection.
Regards,
Ethan
Hi Luca,
If you want to merge both designs, place the termination resistor closest to the transceiver with the series resistors after it closest to the connector. The R1 and R2 should be 10 Ohm pulse-proof resistors otherwise series resistors above 10 Ohms…
Hi Kumaresan,
As Andrew mentioned, ESDS552 is our best protection solution for RS-485 and is able to support 1kV surge events with 42Ohm series resistance. The max surge current for ESDS552 is 25A. Please check the link for more information on the IEC…
Vijaymahantesh,
Those new resistor values you mentioned will be just fine. And 120 Ohms signal impedance is good.
Yes, the SM712 is okay to use for both devices. However, the ESDS552 might be cheaper depending on your configuration.
- Ethan
Vincent,
Thank you for those additional details. I have looked into those specific devices, and they all appear legitimate on my end.
Here are a couple more questions:
Is it possible there are high frequency emissions close to where these devices are…
Hi Jackson,
Below I have attached our best p2p option (ESD761) and our best non p2p option (ESDS552):
PESD0402-140
ESD761
ESDS552
Vrwm (V)
14
24
12
Package Type
DFN-1006
DFN-1006
SOT-23
Nominal Package Size (L x W) (mm)
1.0 x 0.6
1.0 x 0.6
…
