PCA9306 20% failure

Wayne Kao

Other Parts Discussed in Thread: PCA9306, ADS7828

Hi,

I use PCA 9306 as I2C 1.8V-3.3V voltage translator. The schematics is exactly a copy of Fig. 2 in datasheet. The Rpu's are 510 and 1K on 1.8V and 3.3V sides, respectively. The EN pin pull-up resistor is 200K. The bypass capactior on VREF2 pin is 10nF. PCA9306 does the job perfectly. However our 10 ea pilot run has 2 PCA9306 burned during operation. That's quite a high failure rate. Would you please review the design I described above for what could be the cause (i.e. wrong Rpu)?

Regards,

Wayne

over 14 years ago

0 Akhil Nair over 14 years ago

TI__Intellectual 1930 points

Wayne,

Please send me an email at akhil.nair@ti.com.

Regards,

Akhil.

0 Craig Young over 14 years ago in reply to Akhil Nair

Prodigy 55 points

We are having a high failure rate (10-15%) on this device too.
The issue is the voltage on VREF1 pin rises beyond 1.8V during power-up condition. This is causing the chips to fail. We have a 10% boards failing with this issue. We would like to do failure analysis on the failed chips to see what is causing the issue.

0 Akshay Kumar over 14 years ago in reply to Craig Young

Prodigy 20 points

Has the failure rate issue been resolved ?

I am designing a new product which does 3.3V (ARM) to 5V (ADS7828) translation . We don't want to face the same failure rate once we go in for production.

Should i be using some other chip ?

0 Akhil Nair over 14 years ago in reply to Akshay Kumar

TI__Intellectual 1930 points

Akshay,

The PCA9306 is our product line's highest selling part. We sell millions of units every month and certainly don't have anything close to a 20% failure rate. The issue discussed in here is a specific case having to do with a particular customer/application only. We have not seen anything like this at any of our other customer. I hope this puts your mind to rest with regards to using the PCA9306.

Regards,

Akhil.

0 Akshay Kumar over 14 years ago in reply to Akhil Nair

Prodigy 20 points

Thanks Akhil, That gives me some piece of mind.

Can you please tell where i can find the Land Pattern for DCT package for this chip, i have been trying to find the same for a very long time.

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PCA9306 20% failure