TCA9548A-Q1: Temperature of device can stand

Nan Zhang

Part Number: TCA9548A-Q1
Other Parts Discussed in Thread: TCA9548A

Hi team,

I find that there is update that TCA9548A-Q1 added grade 1 to the automotive feature, and deleted Temperature grade 3: -40°C to +85°C, Ta. The grade 1 could stand with -40-125s℃,but our device 's max junction temperature is still 90℃ written in datasheet. The real temperature is almost 105℃ in customer design.

So here are the questions:

1. why device max junction temperature is 90℃(recommended 85℃) with the AEC-Q100 grade 1；

2. do we have roadmap on I2C switch which can stand with -40-125℃ ? In ti.com, there is only one I2C switch device which can reach AEC-Q100.

YOURS

NAN

over 2 years ago

0 BOBBY over 2 years ago

TI__Guru 73761 points

Nan Zhang said:
1. why device max junction temperature is 90℃(recommended 85℃) with the AEC-Q100 grade 1；

This seems to be a mistake that was made when the datasheet was released. I'm working with my team to see if we can actually qualify it for 125C like the commercial TCA9548A.

Nan Zhang said:
2. do we have roadmap on I2C switch which can stand with -40-125℃ ? In ti.com, there is only one I2C switch device which can reach AEC-Q100.

No, we currently do not. We are currently trying to see if we can qualify TCA9548Q1 for this.

-Bobby

0 Nan Zhang over 2 years ago in reply to BOBBY

TI__Intellectual 1895 points

Hi Bobby,

Thanks for your quick reply.

BOBBY said:
This seems to be a mistake that was made when the datasheet was released. I'm working with my team to see if we can actually qualify it for 125C like the commercial TCA9548A.

looking for your reply.

BOBBY said:
No, we currently do not. We are currently trying to see if we can qualify TCA9548Q1 for this.

As for this, I can not find TCA9548Q1 in TI.com, is that not rtm? The customer also want to know whether we have 2/4/6 channel I2C switch with AEC-Q100 125℃？

Yours

NAN

0 BOBBY over 2 years ago in reply to Nan Zhang

TI__Guru 73761 points

Nan Zhang said:
As for this, I can not find TCA9548Q1 in TI.com, is that not rtm?

It's online and has been for years now (there was never a non A version for this device). The link to the datasheet is here: https://www.ti.com/lit/ds/symlink/tca9548a-q1.pdf?ts=1665614222093&ref_url=https%253A%252F%252Fwww.google.com%252F

Nan Zhang said:
The customer also want to know whether we have 2/4/6 channel I2C switch with AEC-Q100 125℃？

The TCA9548A is our only automotice qualified I2C switch

Nan Zhang said:
looking for your reply.

I don't know how long this will take or when it will happen. The team is still looking into it.

-Bobby

0 Nan Zhang over 2 years ago in reply to BOBBY

TI__Intellectual 1895 points

Hi Bobby,

The thin is so urgent. Customer is evaluating this device, this could be a good window to make it happen. Could you please speed it up?

Yours

NAN

0 BOBBY over 2 years ago in reply to Nan Zhang

TI__Guru 73761 points

NAN,

I don't have the ability to speed this up. A normal automotive qualification process can take between 3 to 6 months to do since it involves baking 3 different lots of silicon for months at high Vcc levels before qualification tests can begin. This is required to 'simulate aged silicon'.

-Bobby

0 Nan Zhang over 2 years ago in reply to BOBBY

TI__Intellectual 1895 points

Hi Bobby,

Alright. Thanks for your reply.

Looking forward that.

YOURS

NAN

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TCA9548A-Q1: Temperature of device can stand