Need help identifying TI 6855A component
I'm trying to help the OP at the following thread:
http://forum.hddguru.com/fried-pcb-n...ip-t24422.html I'm fairly certain that the problem is a shorted TVS diode, but I'm curious as to the identify of a 16-pin chip with the following markings: 6855A TI 271 A1CJ It is located just below the 4-pin jumper block, and at about 10 o'clock to the MCU (the largest IC). I suspect that it was made by Texas Instruments, and that it may be a step-down PWM regulator with integrated MOSFET and diode. A datasheet search at TI's web site found no items containing "6855". The board appears to have 5 switchmode supplies (there are 5 inductors), with one being a -5V supply and the others probably being positive step-down regulators. One would provide +1.8V for the SDRAM and flash memory, while the others would provide the Vcore and Vio supplies for the MCU. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
Need help identifying TI 6855A component
On Fri, 09 Nov 2012 19:33:13 +1100, Franc Zabkar
put finger to keyboard and composed: 6855A TI 271 A1CJ The "271" looks like a data code, maybe week 1 of the 7th month (July), 2012. The date codes on other ICs include 228, 229, 1228, 231 which would be consistent. Could it be a Japanese part? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
Need help identifying TI 6855A component
Franc Zabkar wrote in message
... On Fri, 09 Nov 2012 19:33:13 +1100, Franc Zabkar put finger to keyboard and composed: 6855A TI 271 A1CJ The "271" looks like a data code, maybe week 1 of the 7th month (July), 2012. The date codes on other ICs include 228, 229, 1228, 231 which would be consistent. Could it be a Japanese part? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. Is it FQN-16 footprint? if so probably .cn origin |
Need help identifying TI 6855A component
On Mon, 12 Nov 2012 12:16:12 -0000, "N_Cook" put
finger to keyboard and composed: Is it FQN-16 footprint? if so probably .cn origin I don't have access to the actual board. All I have are the photos in that thread ... http://www.users.on.net/~fzabkar/HDD/6855A.jpg - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
Need help identifying TI 6855A component
Franc Zabkar wrote in message
... On Mon, 12 Nov 2012 12:16:12 -0000, "N_Cook" put finger to keyboard and composed: Is it FQN-16 footprint? if so probably .cn origin I don't have access to the actual board. All I have are the photos in that thread ... http://www.users.on.net/~fzabkar/HDD/6855A.jpg - Franc Zabkar -- Please remove one 'i' from my address when replying by email. presumably these grey market "Texas Instr", complete with erroneous col headers. Difficult to be sure they are QFN-16 in your pic http://www.szspl-ic.com/en/IcStock.aspx?page=84&pp=TI |
Need help identifying TI 6855A component
Franc Zabkar wrote in message
... On Mon, 12 Nov 2012 12:16:12 -0000, "N_Cook" put finger to keyboard and composed: Is it FQN-16 footprint? if so probably .cn origin I don't have access to the actual board. All I have are the photos in that thread ... http://www.users.on.net/~fzabkar/HDD/6855A.jpg - Franc Zabkar -- Please remove one 'i' from my address when replying by email. presumably these grey market "Texas Instr", complete with erroneous col headers. Difficult to be sure they are QFN-16 in your pic http://www.szspl-ic.com/en/IcStock.aspx?page=84&pp=TI |
Need help identifying TI 6855A component
On Tue, 13 Nov 2012 08:54:04 -0000, "N_Cook" put
finger to keyboard and composed: presumably these grey market "Texas Instr", complete with erroneous col headers. It's from a Seagate hard drive. I doubt that Seagate would source their components from dubious outlets. Could it be "T1" (tee one) rather than TI (tee eye)? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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