I'm trying to find a replacement for this SMT part to repair a Toshiba 128 GB.

Is this correctly rendered C3531 or 5C531?

Any help with identifying or sourcing would be greatly appreciated . . .

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http://www.datasaversllc.com

It is usually more helpful to show the part in context. Could we see the entire PCB?

By comparing the subject IC against other parts, it is often possible to identify the date codes, batch codes, manufacturing location, etc. The layout of the PCB should also tell us something about the function of the part.

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A backup a day keeps DR away.

Thank you.

Here goes . . .

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I'm sorry, I can't identify the mystery part.

"91512" is probably a dual step-down converter. It appears to have a pinout similar to Rohm's BD9152MUV, but the latter requires an input voltage range of 4.5V - 5.5V. Your IC would be powered from 3.3V. The "5211B" marking suggests a YWW date code of 2015, week 21. I'm betting that this IC produces the Vcore and Vio supplies for the flash controller. The Vio supply might also be used by the NAND array.

The date code on the PCB appears to be 1523 (below the sticker) and the date on the sticker is 16 JUL 2015.

The markings on the IC above "MDK" appear to be ...

841
517
oU6

This would suggest a YWW code of 2015, week 17. The part code is probably "841".

Your mystery part has a "531" in its markings, but I can't see how this could be a YWW code since it would be more recent than the manufacture date on the sticker. The fact that there are two of these parts precludes it as a temperature sensor. I can't see it being a power supply supervisor IC for the same reason. The heavy trace appears to be the supply pin, but only two of the remaining pins appear to be connected. The ICs don't look like LDO regulators, either. I can't make out the ground pin, assuming there is a ground connection.


Toshiba Solid State Drive HG6 Series datasheet (THNSNJ256GVNU):
http://www.farnell.com/datasheets/1852757.pdf

BD9152MUV, Rohm, 1.5A dual step-down switching regulator:
http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd9152muv-e.pdf

_________________
A backup a day keeps DR away.

Does this help?....

http://pdf1.alldatasheet.com/datasheet- ... asheet.pdf

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I examined photos of a related product (Toshiba HG6 THNSNJ512GCSU SATA SSD).

http://imagescdn.tweaktown.com/content/6/6/6684_02_toshiba_hg6_thnsnj512gcsu_enterprise_ssd_review_full.jpg
http://imagescdn.tweaktown.com/content/6/6/6684_08_toshiba_hg6_thnsnj512gcsu_enterprise_ssd_review_full.jpg
http://imagescdn.tweaktown.com/content/6/6/6684_07_toshiba_hg6_thnsnj512gcsu_enterprise_ssd_review_full.jpg
http://imagescdn.tweaktown.com/content/6/6/6684_09_toshiba_hg6_thnsnj512gcsu_enterprise_ssd_review_full.jpg
http://www.storagereview.com/images/StorageReview-Toshiba-HG6-PCB.jpg

There is a Rohm IC (BD9139MUV) whose markings are of the same style as the "91512" device, including the prominent pin#1 dot, so I'm convinced that the latter is also made by Rohm (BD91512MUV ?). The second line has "4183B" while the flash controller and NAND chips have date codes of 1414 and 1420. This would tend to confirm that 418 is a YWW date code (521 in your case).

The SATA PCB also has your mystery IC in two locations. However, the markings are ...

--o5--
--C5
--91--

This would suggest that the 91 and 31 characters are batch codes or date codes. Therefore the part identifier would appear to be 5C5.

A Google search suggests that XC6106C036MR may be a suitable candidate.

http://kazus.ru/datasheets/smd/go/?query=5C5

The datasheet would suggest that the numbers mean the following:

5 = XC6106 series
C = 50ms release delay time (for manual reset)
5 = 3.6V detect voltage

I don't understand how this can correlate with a 3.3V supply.


BD9139MUV, Rohm, 2.7V - 5.5V, 3A, 1ch Synchronous Buck Converter with Integrated FET, VQFN016V3030, marking "D91 39": http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd9139muv-e.pdf

XC6106C036MR, Torex, high-precision, low current consumption voltage detector, SOT-25:
https://www.torexsemi.com/file/en/technical-support/discontinued/-2016/51-XC6101_07_11_17.pdf

_________________
A backup a day keeps DR away.

XC6105C531 has a marking code that begins with 4. ISTM that we are both wrong in regard to these voltage monitor ICs. To me it doesn't make sense that there would be two identical voltage monitors in the same circuit.

_________________
A backup a day keeps DR away.