chang830
Full Member level 5
Hi,
We know, in the stardard HBM ESD test, three chips will go through the ESD ZAP with same mode. If all the three chips passed the ESD ZAP, then we think the chips passed under this mode.
But for my chips, I found an interesting thing. In the three ESD ZAPs, one chip passed 2000V in HBM mode, one failed in 2000V, the 3rd one even did not pass 1000V. If there is a weak path in the chip, it should fail at about the same level. Then why it have so much descranpancy?
Would anyone pls. give me some hints?
Thanks
We know, in the stardard HBM ESD test, three chips will go through the ESD ZAP with same mode. If all the three chips passed the ESD ZAP, then we think the chips passed under this mode.
But for my chips, I found an interesting thing. In the three ESD ZAPs, one chip passed 2000V in HBM mode, one failed in 2000V, the 3rd one even did not pass 1000V. If there is a weak path in the chip, it should fail at about the same level. Then why it have so much descranpancy?
Would anyone pls. give me some hints?
Thanks