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Old 7th February 2013, 01:56 PM   #71
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I think they are genuine...
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Old 7th February 2013, 02:03 PM   #72
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Let me take a look at mine and Ill give you my opinion. I highly distrust anything sold from unauthorized distributors.
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Old 7th February 2013, 04:15 PM   #73
Zen Mod is offline Zen Mod  Serbia
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it's written Zhou Fang on photo

SS from him were originals
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Old 7th February 2013, 05:18 PM   #74
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Originally Posted by permaneder View Post
Does your photo show genuine parts or fakes?
Ideally, SemiSouth or assignee may/could do elemental analyses on these two devices as follows. Scrape some of the housing [epoxy?] , some of the ink, and some metal from the leads; and subject the scrapings to Scanning Electron Microscopy [SEM] for a fingerprint of which elements are present and their extent. May also do an X-Ray scan for additional signatures. The harder part is to determine the probability that the analyses match or not; given or granted that SemiSouth had already collected a solid reference for comparative analyses.
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Old 7th February 2013, 05:50 PM   #75
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If from Zhou, I would agree, as he bought a large number early.
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Old 7th February 2013, 06:02 PM   #76
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Originally Posted by buzzforb View Post
If from Zhou, I would agree, as he bought a large number early.
There is a paper trail which leads to SemiSouth manufacturer.
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Old 7th February 2013, 06:30 PM   #77
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Quote:
Originally Posted by Antoinel View Post
Ideally, SemiSouth or assignee may/could do elemental analyses on these two devices as follows. Scrape some of the housing [epoxy?] , some of the ink, and some metal from the leads; and subject the scrapings to Scanning Electron Microscopy [SEM] for a fingerprint of which elements are present and their extent. May also do an X-Ray scan for additional signatures. The harder part is to determine the probability that the analyses match or not; given or granted that SemiSouth had already collected a solid reference for comparative analyses.
I made a mistake above. The test method is XRF or X-Ray Fluorescence instead of SEM.
The industry of electronic devices has moved away from using the element Lead [Pb] in their construction. A reputable supplier of devices will not bend/break this rule; unlike one [with maybe a good probability] who is illegaly making its functional copies. Analytical Chemistry to the rescue. There are kits which test for surface Lead as on the leads of the device. The web is full of them at less than $20.
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Old 7th February 2013, 07:23 PM   #78
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Semiconductor manufacturers need to incorporate better anti-counterfeiting measures into their parts. Fake parts is a huge problem. And not just Semisouth.

BTW, did Semisouth actually manufacture the parts themselves, or did they contract another manufacturer to make them?
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Old 7th February 2013, 08:13 PM   #79
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Originally Posted by labjr View Post
Semiconductor manufacturers need to incorporate better anti-counterfeiting measures into their parts. Fake parts is a huge problem. And not just Semisouth.

BTW, did Semisouth actually manufacture the parts themselves, or did they contract another manufacturer to make them?
labjr. I hope this helps answer some of your questions [from the web]. The site www.semisouth.com is not responsive, and draws a blank page.

24 October 2012
SemiSouth to be closed; 90 staff to be laid off

SemiSouth Laboratories Inc of Starkville, MS, USA, which designs and manufactures silicon carbide (SiC) devices for high-power, high-efficiency, harsh-environment power management and conversion applications, is to close down, according to a report by the Starkville Daily News.
SemiSouth was founded in 2001 by former Mississippi State University (MSU) faculty member Jeffrey Casady and current MSU electrical and computer engineering professor Michael Mazzola, and has since been housed at the Thad Cochran Research, Technology and Economic Development Park near MSU.
MSU director of university relations Sid Salter said that, while MSU does not have a formal business relationship with SemiSouth, the university assigned the technology’s intellectual property rights to non-profit organization MSU Research and Technology Corp, giving the university a 2% stake. As owner of the Cochran facility, MSU has managed SemiSouth’s lease of its portion of the building (yielding $300,000 in revenue annually).
In October 2010, in order to drive the expansion of its SiC fabrication facility, Power Integrations Inc of San Jose, CA, USA (which supplies high-voltage integrated circuits for compact, energy-efficient power conversion in electronic products for AC-DC, DC-DC and LED lighting applications) made a $30m strategic investment in SemiSouth (including an equity investment, a technology license and other financial commitments). The firms also collaborated on driving the adoption of SemiSouth’s SiC technology, aiming to speed the development of efficient power conversion devices for applications including solar and wind inverters as well as hybrid/electric vehicles.
In second-quarter 2011, to expand production capacity, SemiSouth installed an Aixtron AIX 2800G4 WW chemical vapor deposition (CVD) reactor in 10x100mm- and 6x150mm-wafer configuration for the production of power SiC junction field-effect transistor (JFET) and Schottky barrier diode (SBD) devices. More recently, just this March, SemiSouth announced its second major capacity expansion (worth $18m) within 18 months, intended to add 50% more capacity to meet demand for SiC power JFETs and power diode products from the solar inverter and industrial power supply markets.
However, now, Power Integrations says that its third-quarter 2012 results will include a pre-tax charge of about $60m from the closure of SemiSouth (resulting in a net loss). “The expected closure of SemiSouth is disappointing, but reflects the challenges and risks inherent in the quest for disruptive technologies,” says Power Integrations’ president & CEO Balu Balakrishnan. “Our strategic direction remains unchanged, and we continue to invest in promising technologies to expand our market opportunity within the realm of high-voltage power conversion,” he adds.
MSU vice president for research David Shaw hopes a solution can be developed to retain employees among the 90 affected. “We hope we can be a resource to some of these families looking for other job opportunities,” adds Jennifer Gregory, VP for tourism and development at the Greater Starkville Development Partnershipj
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Old 17th October 2014, 02:33 AM   #80
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It looks like the products of Microsemi manufacturer. APT series MOSFET. rebrand only.
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