HDC3020: questions about 85°C/85% accelerated life test impact on polymer-based relative humidity sensors (SLYY210)

junger zou

Part Number: HDC3020

Dear TIs:

there is an application notes for TI humidity sensor HDC3020 named 85°C/85% accelerated life test impact on polymer-based relative humidity sensors (SLYY210) , would you please explain more detail for this stress test ?

1) place the samples in chamber 85°C/85% for 1000 hours ,

2) test performance in the same chamber and check some tempreture and humidity point data directly ? no need take out those sampels from chamber to a dry enveirement ? do wen need run drift compensation or heater the sensor first before check performance ?

so is it possible to know how to do this test step by step? I need run this kind of benchmark test using my HDC3020 EVM.

thanks.

over 2 years ago

+1 Josh Wyatt over 2 years ago

TI__Guru* 91206 points

Dear Junger -

The accelerated life testing, as mentioned in the white paper you reference, is from JESD22-A101 standard and is not unique to the sensors.

This standard establishes a defined method and conditions for performing a temperature-humidity life test with bias applied. The test is used to evaluate the reliability of nonhermetic packaged solid state devices in humid environments. It employs high temperature and humidity conditions to accelerate the penetration of moisture through external protective material or along interfaces between the external protective coating and conductors or other features that pass through it. This revision enhances the ability to perform this test on a device which cannot be biased to achieve very low power dissipation.

You can download the spec from here (it is free, but registration is required)

https://www.jedec.org/document_search?search_api_views_fulltext=A101

The units can be baselined before the test, placed in chamber for the duration and then retested again to see the drift, which is natural, because this test equates to >30 years of service use.