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
…
Part Number: THVD1400 Other Parts Discussed in Thread: ESDS452 , ESDS552 , TSD05 Tool/software: Hello E2E Community,
We are using THVD1400 for our RS485 use case with a maximum data rate of 20kbps. The maximum trace lengths on the PCB from THVD to MCU…
Hi Andy,
In terms of the recommended ESD devices from TI, please see below:
For Bus Receiver pins, we recommend ESDS552, as the working voltage is 12V and clamps between 19 and 23.5V.
For the Rin pins, we recommend ESD451, as the working voltage is 5…
