Author Topic: NI USB-8473 USB-CAN Repair  (Read 469 times)

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Offline strahd_von_zarovichTopic starter

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NI USB-8473 USB-CAN Repair
« on: December 18, 2024, 10:20:00 am »
Hi everyone,

My NI USB-8473 converter has been damaged (I’m not sure why).

I tried to identify the damaged part, and it appears to be the IC below. Hopefully, it’s the only damaged component. It has a “Q” marking, so it is likely a transistor array (since it has six pins).

I tried to find the exact part number but had no luck. The board has two physically isolated sections, and this IC is connected to the transformer.

 

Offline MichaelPI

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Re: NI USB-8473 USB-CAN Repair
« Reply #1 on: December 18, 2024, 11:11:03 pm »
My initial guess would have been one of the devices from the SN6505 family by TI, as those push-pull drivers are typically used for isolated CAN interfaces. But the marking would be something like '65AQ'. The marking shown in the picture seems to be '67h'. Do you have more pictures showing the part of the board, in which the desoldered IC was located? Based on that, you can rule out certain types of components.
Keithley 2700 + 7700, Keithley 2750, Prema 5000, Fluke 77, Hioki 3256-50, Sonel MIC30, EA-PS2332-025, Delta Electronica SM1540, Toellner 7402, Toellner 7607, Hameg 8131-2, HP 53181A, HP 5334B, HP E3615A, HP 4192A, PicoScope 2204A, NI USB-6210, Philips 6303, Sefelec MGR10C
 

Offline strahd_von_zarovichTopic starter

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Re: NI USB-8473 USB-CAN Repair
« Reply #2 on: December 19, 2024, 09:46:52 am »
Dear Micheal,

Thank you for your answer.

The marking seems to be "67h" , you are right.

Here are pictures of the board. The desoldered component is Q6 below the CE marking.

It would be weird, If it is a driver IC and they marked it as "Q"  :palm:

Looks like pin-1 and pin-4 are connected to the ground.
« Last Edit: December 19, 2024, 09:48:50 am by strahd_von_zarovich »
 

Offline MichaelPI

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Re: NI USB-8473 USB-CAN Repair
« Reply #3 on: December 20, 2024, 08:11:44 pm »
Hi,

interesting, it seems as if NI decided to build a discrete push-pull transformer driver. Initially I thought, NI uses a driver from Maxim (ADI) as the datasheet of HALO TGMR340 recommends the usage of drivers by Maxim. I could not find any driver IC by Maxim with the correct pin count, hence we can rule out the usage of any highly integrated solution. The marking Q6 in the solder resist is probably correct and it is indeed a bipolar bipolar transistor / mosfet. The typical topology of a push-pull transformer driver gives some clues, that it is most likely a dual NMOS device.

The two diodes (44t marking) are BAT54SW schottky diodes by Nexperia. The two ICs (BEL marking) are 74AHCT1G08DCKRE4 by TI are AND gates.
The weird thing is, I could only find NUP4302MR6 (TVS diodes) by ONSemi for the "67" marking. That does not fit...

Both pins 1 and 4 connected to ground, which makes perfect sense for dual NMOS device (source connected to ground) in a SOT363 package like the NX3008NBKS ...

Keithley 2700 + 7700, Keithley 2750, Prema 5000, Fluke 77, Hioki 3256-50, Sonel MIC30, EA-PS2332-025, Delta Electronica SM1540, Toellner 7402, Toellner 7607, Hameg 8131-2, HP 53181A, HP 5334B, HP E3615A, HP 4192A, PicoScope 2204A, NI USB-6210, Philips 6303, Sefelec MGR10C
 


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