LTC2357-16 keeps shorting 5 volt rail to ground.

1) The only issue I see with the schematic is the resistors in series with the VCC and VEE bypass capacitors. I don't think this is the cause of the problem but the series R will reduce the effectiveness of the capacitors.

2) The LTC2357 does not have any particular power supply order. Make sure there are no glitches in the supply voltage that exceed abs max specs when powering the LTC2357. Also make sure that the analog and digital inputs are not biased before their respective supplies are powered.

3) 810F for long periods of time is sufficient to damage the LTC2357. Can you try reducing the temperature and see if the issue goes away?

Thank you!

1) I will take that under advisement.

2) I connected the power leads to a scope and when applied nothing shot up too high. Voltages bounce as expected but within range.

3) I planned to a inline fuse to trip at 200mA and try another chip I will lower my temps to 350c and see if that helps.I'm sure it was not on there for over 30 seconds but no idea what a long period would amount to.

Oh let me understand this better

"Also make sure that the analog and digital inputs are not biased before their respective supplies are powered."

So my analog input in this case is the REFBUF (2.5 volts). When I apply my power source the REFBUF takes 10uS to start up. 200mS to come up fully..

Are you saying the concern is that the analog needs to power up after he power source? In which case it is.

If you are driving REFBUF, REFIN should be grounded.

For analog inputs I was referring to INx+ and INx-. Do not drive these until VCC and VEE have powered up.

For digital inputs, I was referring to PD, LVDS/CMOSL, SDI etc. Do not drive these until OVDD has powered up.

For CNV and REFBUF if you are driving it, do not drive until VDD has powered up.

OH I understand thank you.

I believe it was one of two things.

1) My meter  may have been using 9v for continuity. Datasheet says 6 max on that rail.

2) I lower heat and used the 2 second rule.

Issue seems to be gone atm.

Sadly the issues returned.

The chip was in place and working well. I did a lot of testing with it. I had to change a resister unrelated to this chip and now its bad again. So I can rule out the solder heat.

All that was done to this chip was some cleaning with acetone.The 5 volts was protected with a 200ma fuse so I do not thin the issue came from the 5 volt rail. 

The 15 volt pin does spark a bit because it's a pin that must be connected, I wonder if plugging in the pins first and then the main power source is wiser?

I set it up to be a permanent connection and used the main power source. So far this has worked

If you are drawing sparks, you can definitely have ESD problems.