Hi,
ESD224 is a bi-directional protection device, and TPDxE05U06 is a uni-directional protection device. In a 3.3V system, the uni-directional protection device can clamp the negative spike on the digital line, but not for bi-directional protection device. So, can TI give the pros and cons for ESD224 compared to TPDxE05U06?
Thanks.
Hello,
ESD224 and TPD4E05U06 (I'm assuming you are referring to the 4 channel version) have quite a few differences. Typically, when selecting an ESD protection device, you want the Vrwm to be as close to the normal operating voltage of the lines being protected as possible. Since ESD224 has a 3.6 V Vrwm and TPD4E05U06 has a 5.5 V Vrwm, ESD224 would be is more optimal in that regard.
With regards to negative clamping, like you said, ESD224 is bidirectional and TPD4E05U06 in unidirectional. While unidirectional devices typically have better negative clamping than bidirectional, that does not mean bidirectional device are unable to clamp negative spikes. It just means that the negative clamping performance will be the same as the positive clamping performance.
However, ESD224 has an internal series resistor that greatly improves it's clamping performance. If you look at the -8 kV @ 30 ns clamping performance in the datasheet, the system side of the device only receives -5 V. TPD4E05U06 will clamp at around -15 V.
While ESD224 has better clamping performance, TPD4E05U06 also has two main advantages: flow-through routing and 5 V short protection. ESD224 requires that the device is in series with the signal trace rather than in parallel. TPD4E05U06 does not have this requirement, allowing for flow-through routing. Also, if there is a chance that the 3.3 V signal line can be shorted to a 5 V line, like VBUS in USB, a 5.5 V diode will be able to survive this short event and a 3.6 V diode will sometimes not.
Can you share what type of application you are wanting to use these devices for?
Regards,
Matt Smith
