| Electronics > Repair |
| NI USB-8473 USB-CAN Repair |
| (1/1) |
| strahd_von_zarovich:
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. |
| MichaelPI:
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. |
| strahd_von_zarovich:
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. |
| MichaelPI:
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 ... |
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