Resistance also has electrostatic ability? Will the resistance be damaged by static electricity? Many people may report questions. This article will introduce the electrostatic ability of resistors.
In our daily design, we pay much attention to the electrostatic protection design of semiconductor devices, but seldom pay attention to whether the resistance needs electrostatic protection, and whether the resistance will be damaged by static electricity and become invalid. The answer is yes, otherwise this article will be meaningless.
There are three models of static electricity HDM: human body model; MM: machine model; CDM: device discharge model. For the convenience of analysis, this article only selects the human body model as the research. The following is the electrostatic discharge model and discharge waveform of the human body model (refer to ISO10605).
Figure 1. Human body model and discharge waveform
First of all, let's define what a failure is. The failure modes of a resistor include open circuit, short circuit, and drift. Any one of them will be identified as failure, especially if the drift exceeds the specification and calibration, it will fail.
First, determine several important parameters of resistance: voltage, current, rated power and pulse power. I don't think I need to repeat the first three, but I will focus on the pulse power. The following figure 2 shows the pulse power parameters of a 0603 resistor, single pulse and repetitive pulse power.
Take the ±8kV human body model as an example: the electrostatic discharge time is at the level of ns. Refer to Figure 1 for details. The minimum time parameter given by the pulse power of the resistor in Figure 2 below is 1 us (10-6), and the difference is not particularly large. Here, the pulse power that can be taken by the myopic resistor is 70-90 times the rated power. (Note: The resistance of different processes is not the same, here is a specific analysis pertinent)
Figure 2.0 The pulse power of a 603 resistor
Assuming that the resistance of the port is 10K to ground, the actual pulse power received by the resistance is:
Pesd=8000V*8000V/10K=6400W >> 90*PR=9W
Then the resistance has the risk of failure, and the typical failure is that the resistance will drift. So don't think that the resistance is put on the port can be worry-free, but in fact the risk is very high, you need to pay attention to and add certain protective measures when designing. It should be ensured that the pulse power of the resistor can withstand the highest electrostatic discharge power.
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