The following is a reprint of my January 8, 2008 RealMoney column.

In other articles, I have outlined the reasons why I think the semiconductor industry is poised for strong stock performance and why I think MEMC Electronic Materials (MEMC) is the best play on the sector.

But I also realize that a bullish semiconductor outlook right now involves making a grab at that falling knife. Therefore, I thought I should also let people know which semiconductor stock looks most vulnerable to a downturn.

I think that stock is Microsemi (MSCC).

Microsemi is a leading designer, manufacturer and marketer of high performance analog and mixed-signal integrated circuits and high-reliability semiconductors. Its products manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals.

Microsemi has held up fairly well, handily beating the performance of the Semiconductor HOLDRs (SMH) over the last year. This may be due largely to its strong end markets, which include defense, commercial aerospace, industrial/semicap, medical, mobile connectivity and notebooks, monitors and LCD televisions.

More Questions Than Answers

To me, however, the strong end markets only raise questions concerning Microsemi’s fundamental performance. For example, with such strong end markets, why did its cash from operations fall by more than half in the year ended September 30, 2007, compared with the prior year? Why is its inventory rising faster than sales, and why is its gross margin slipping?

I turned to the company’s latest 10K in hope of finding answers.

To begin with, the area is highly competitive. According to the 10K (emphasis added), “some of our current major competitors are Freescale Semiconductor, Inc., National Semiconductor Corp. (NSM), Texas Instruments, Inc. (TXN - Annual Report), Koninklijke Philips Electronics (PHG), ON Semiconductor Corp. (ONNN), Fairchild Semiconductor International, Inc. (FCS), Micrel Incorporated (MCRL), International Rectifier Corp. (IRF), Semtech Corp. (SMTC), Linear Technology Corp. (LLTC), Maxim Integrated Products, Inc. (MXIM), Skyworks Solutions, Inc. (SWKS), Diodes, Inc. (DIOD - Annual Report), Vishay Intertechnology, Inc. (VSH), O2Micro International, Ltd. (OIIM) and Monolithic Power Systems, Inc. (MPWR).” Gosh, I wouldn’t want them to leave anyone out.

Yet competition is just the third risk factor among a list that runs more than 12 pages.

The company notes the decline in net income related to non-cash acquisition related charges, restructuring charges and other factors. Yet non-cash charges don’t quite explain the decline in cash flow from operating activity. Furthermore, with “non-recurring” charges being reported in each of the last three years I’m going to go out on a limb and say investors can probably expect more of them in the future.

A Questionable Acquisition

According to the 10K, the company completed a merger with PowerDsine on January 9, 2007 and subsequently renamed PowerDsine Ltd., Microsemi Corp. - Analog Mixed Signal Group, Ltd. (”AMSGL”). Later, it notes that it “provided a valuation allowance of approximately $9,534,000 as of September 30, 2007 on all of our net deferred tax assets related to AMSGL as we have determined that it was more likely than not that the deferred tax assets would not be realized.”

Deferred tax assets are realized when the company earns taxable income in future periods. I’m not a big fan of acquiring companies that will “more likely than not” fail to earn taxable income in the future. This was one of the contributors to the decline in cash flow.

Microsemi’s gross margin weakened in the latest quarter (see chart.)

Source: Zacks Research Wizard, compiled by William A. Trent

I think there is additional margin risk stemming from burgeoning inventory levels.

Source: Zacks Research Wizard, compiled by William A. Trent

Since a large percentage of costs at semiconductor companies is fixed, producing more units results in a lower cost per unit and higher profit margins. But many of the additional units Microsemi is producing are going into inventory rather than the hands of customers.

At some point, Microsemi is going to have to sell that inventory (by producing less than customers demand.) That will reverse the positive effect on future gross margins.

Valuation Too High

All this would matter less if the stock looked cheap. But on the basis of free cash flow yield, which is my favored metric, Microsemi looks more expensive than most of its peers.

Free cash flow in 2007 was less than $4 million. On an enterprise value of $1.56 billion, that amounts to a free cash flow yield of just 0.25%. The cash flow would have to grow 150-fold just to bring the yield on par with that of Treasury bonds.

Even using the company’s best cash flow on record ($36.5 million in 2006) the yield is just 2.35% - nearly a percentage point below that of Treasuries. If I thought the company could return to the 2006 cash flow level, then grow at the forecast rate, I would be willing to consider an investment.

But given the rising inventory, unprofitable acquisition and potential for further declines in gross margin, I won’t be holding my breath.

Disclosures: William Trent is long Semiconductor HOLDRS (SMH) and Maxim Integrated Products (MXIM). He holds put options against shares of Lam Research (LRCX).

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William Trent currently owns put options against the shares of Lam Research (LRCX).

Update: The original post contained a data error.
In the interest of digging deeper into the semiconductor oversupply issues, this post will begin a series of data gathering on important ratios for companies in the industry. Hopefully the process will provide insight toward the companies better (or worse) positioned to take advantage of the next upturn or weather the downturn.

Today I used Zacks Research Wizard to get the recent Cost of Goods Sold (COGS) and Inventory levels for semiconductor industry participants over the last several quarters. I made some modest limitations on the share volume and market cap, but still ended up with more than 50 names. I used trailing twelve month COGS and the average of the last five quarters (for a beginning, ending and average) of inventory to calculate Days Sales in Inventory.

The higher the inventory levels, the more likely the company will need to reduce prices, reduce production or take a write-off, all of which would reduce gross profit margin. This first pass looks merely at inventory levels and does not consider strategy or other factors. For example, a fabless company would likely own less inventory than a company that produces chips at its own facilities. In a later post I will consider the trends in inventory (although the historic data I provide below gives some of it away) to determine the companies for which inventory levels are higher than the historic norm for that particular company.

The five companies with the highest levels of inventory relative to their recent sales levels are: Microsemi (MSCC), Lattice (LSCC), Analog Devices (ADI), Micrel (MCRL) and Intersil (ISIL).

The five with the lowest levels of inventory relative to recent sales are: Amkor Tech (AMKR); Smart Modular (SMOD), Large Cap Watch List (Track at Marketocracy) member MEMC Electronics (WFR); Actions (ACTS) and Sirf Technology (SIRF).

The complete list follows.

Disclosure: William Trent has a long position in SMH.