TR53 Packaging (for Table 4, Conductive Packaging)

General Discussion
#1

Hello,

I have a question: When I see the ESD 2020. Table 4, for compliance verification for Conductive packaging I see this:

  • Test Method: ESDTR53 Packaging section, with required limits of <1x10e4 ohms.

Now, when I go to TR53, for packaging, I see that the reference for retest is 1x10e6 ohms (for all methods: 7.4.1 to 7.4.5), and there’s no clarity on checking based on the type of packaging and when to report the compliant verification result.

I just want to understand the approach

Thank you

#2

Santiago,

I believe you are referring to the sections in ESD TR53 which state:

“Apply 10 volts and wait 5 seconds or for the resistance measurement apparatus to stabilize. If
the indicated resistance is less than 1.0 x 106 ohms, observe the result. If the indicated
resistance is equal to or greater than 1.0 x 106 ohms, switch the resistance measurement
apparatus to 100 volts and retest. Observe the result after the resistance measurement
apparatus stabilizes or after 15 seconds.”

If so, this is a standard boilerplate paragraph detailing how much voltage to apply to the packaging to measure the resistance. If you are measuring conductive packaging, you should only need to ensure the voltage of the resistance measurement apparatus is at 10 volts since the resistance should be less than 10^6 ohms, which would be the resistance above which you would need to change to using 100 volts.

The resistance should, in fact, measure less than 10^4 ohms to comply with the conductive packaging requirement of ANSI/ESD S20.20. The instruction tells you how to measure resistance regardless of the type of packaging or resistance value obtained.

Most resistance measurement apparatus’ you can buy today from ESD manufacturers have relays built into the circuitry to test for the initial resistance and switch over to 100 volts if it senses a resistance over 10^6 ohms.

#3

So for all TR53, at least for most of control items, this is exactly the same paragraph since it’s just a boilerplate paragraph on how measuring and getting to the needed value would work.

Since our digital testers have these parameters built into their hardware via internal relays, the process is effectively ‘plug-and-play.’ There’s no need for manual calculation - simply record the output directly from the device.

Totally understood!, thank you @AndyN