THVD1552: Some questions about THVD1552

ttd said:

Q1) Capacitance of THVD1552DGSR Signal Terminals
The datasheet does not include this information. Are there any measurement data or reference values available?

We don't measure the capacitance of our pins or place any kind of spec limit on them. Generally what you will see is the input pins will have more capacitance due to them being CMOS inputs and the output pins will have less capacitance since they are CMOS outputs. For 1552 which is a full duplex device, you will likely end up with higher capacitance on the differential input pins vs the differential output pins. 

ttd said:

Does this device incorporate protection elements like TVS diodes on the signal pins?

Yes, there are some protection cells on the differential pins to ensure they can handle transient events. These are spec'd on the ESD table of the datasheet.

ttd said:

I'd like to confirm the presence/type of internal protection, as this affects whether external TVS selection is necessary and impacts capacitance estimation.

Yes there are internal protection devices present on the differential pins. They should not bias when the pins are within the abs max ratings.

ttd said:

Q3) Other Recommended Products
If any products meet the following conditions, please advise.

・If protection elements are integrated on signal pins: Input capacitance ≤ 25 pF
・Package type: SOIC-14 (if possible)

Most of our devices don't have an input cap spec. 

From a longevity standpoint, we generally recommend our THVD family as these are our newer devices made in the 300mm wafer technology. 

-Bobby