Sifting through countless of stocks in the Semiconductors & Semiconductor Equipment industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Diodes Incorporated or Semtech Corporation because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Diodes Incorporated and Semtech Corporation compare based on key financial metrics to determine which better meets your investment needs.

About Diodes Incorporated and Semtech Corporation

Diodes Incorporated, together with its subsidiaries, provides semiconductor products in Asia, the Americas, and Europe. The company offers MOSFET and SiC MOSFET discrete semiconductor products; data line protection, power line protection, thyrister, USB Type-C protection, and transient voltage suppressor protection devices; Schottky diodes, small signal switching diodes, Zener diodes, and SiC diodes; and bridges, super barrier rectifiers, Schottky rectifiers, Schottky bridge rectifiers, and fast and ultra-fast rectifiers. It also provides avalanche transistors, gate driver transistors, and pre-bias transistors; power management devices, such as AC-DC and DC-DC converters, digital isolators and isolated gate drivers, USB power switches, low dropout, photocoupler, and linear voltage regulators; standard linear devices, such as operational amplifiers and comparators, current monitors, voltage references, and reset generators; LED lighting drivers; audio amplifiers; and sensor products, including Hall-effect sensors and motor drivers. In addition, the company offers mixed-signal products comprising high speed mux/demux, digital switches, interface, redrivers, universal level shifters/voltage translators, clock ICs, and packet switches; low-voltage complementary metal-oxide-semiconductor (CMOS) and CMOS devices, as well as ultra-low power CMOS logic and analog switches; and multichip products, co-packaged discrete, analog, and mixed-signal silicon in miniature packages. Further, it provides silicon and silicon epitaxial wafers; frequency control products; and contact image sensors. The company serves industrial, automotive, computing, consumer, and communications end-markets through direct sales, marketing personnel, independent sales representatives, and distributors. Diodes Incorporated was incorporated in 1959 and is headquartered in Plano, Texas.

Semtech Corporation provides semiconductor, Internet of Things systems, and cloud connectivity service solutions in the Asia- Pacific, North America, and Europe. The company operates in three segments: Signal Integrity, Analog Mixed Signal and Wireless, and IoT Systems and Connectivity. It provides signal integrity products, including a portfolio of optical and copper data communications and video transport products used in various infrastructure, and industrial applications; a portfolio of integrated circuits for data centers, enterprise networks, passive optical networks, wireless base station optical transceivers, and interface applications; and video products for broadcast applications, as well as video-over-IP technology for professional audio video applications. The company also offers analog mixed signal and wireless products; protection devices, such as filter and termination devices which protect electronic systems from voltage spikes; and designs, develops, manufactures, and markets radio frequency products used in industrial, medical, and communications applications, as well as specialized sensing products. In addition, it provides switching voltage regulators, combination switching and linear regulators, smart regulators, isolated switches, and wireless charging related products. Further, the company offers a portfolio of IoT systems and connectivity solutions, such as modules, gateways, routers, and connected services, including wireless connectivity and cloud-based services for industrial, medical, and communications applications. It serves original equipment manufacturers, solution providers, commercial applications, infrastructure, high-end consumer, and industrial end markets. The company sells its products through direct sales personnel, independent sales representative firms, and independent distributors. Semtech Corporation was incorporated in 1960 and is headquartered in Camarillo, California.

Latest Semiconductors & Semiconductor Equipment and Diodes Incorporated, Semtech Corporation Stock News

As of September 2, 2026, Diodes Incorporated had a $4.1 billion market capitalization, compared to the Semiconductors & Semiconductor Equipment median of $4.7 million. Diodes Incorporated’s stock is up 81.4% in 2026, down 1.5% in the previous five trading days and up 69.23% in the past year.

Currently, Diodes Incorporated’s price-earnings ratio is 48.4. Diodes Incorporated’s trailing 12-month revenue is $1.6 billion with a 5.3% net profit margin. Year-over-year quarterly sales growth most recently was 21.7%. Analysts expect adjusted earnings to reach $3.225 per share for the current fiscal year. Diodes Incorporated does not currently pay a dividend.

As of September 2, 2026, Semtech Corporation had a $12.5 billion market cap, putting it in the 80th percentile of all stocks. Semtech Corporation’s stock is up 77.9% in 2026, down 8% in the previous five trading days and up 131.74% in the past year.

Currently, Semtech Corporation’s price-earnings ratio is 82.4. Semtech Corporation’s trailing 12-month revenue is $1.2 billion with a 13.1% net profit margin. Year-over-year quarterly sales growth most recently was 32.7%. Analysts expect adjusted earnings to reach $3.474 per share for the current fiscal year. Semtech Corporation does not currently pay a dividend.

How We Compare Diodes Incorporated and Semtech Corporation Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Diodes Incorporated and Semtech Corporation’s stock grades to see how they measure up against one another.

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Diodes Incorporated and Semtech Corporation Stock Value Grades

Company	Ticker	Value
Diodes Incorporated	DIOD	D
Semtech Corporation	SMTC	F

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection.

Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

AAII’s A+ Investor Value Grade derives from a stock’s value score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are a good value and so on.

Diodes Incorporated has a Value Score of 24, which is Expensive. Semtech Corporation has a Value Score of 2, which is Ultra Expensive.

The Value Stock Winner: No Clear Winner

Neither Diodes Incorporated or Semtech Corporation has a high enough value grade to be considered a “winner.” Investors who are considering these companies should do additional due diligence and research to see if either could be a good addition to their portfolio. It’s important to look at a wide range of financial metrics in order to determine if Diodes Incorporated or Semtech Corporation is the better investment when it comes to value.

Diodes Incorporated and Semtech Corporation’s Quality Grades

Company	Ticker	Quality
Diodes Incorporated	DIOD	B
Semtech Corporation	SMTC	B

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Diodes Incorporated has a Quality Score of 79, which is Strong. Semtech Corporation has a Quality Score of 78, which is Strong.

The Quality Grade Winner: It’s a Tie!

Looking at the Quality Grade breakdown above, both Diodes Incorporated and Semtech Corporation have a grade of B. For investors who focus solely on a company’s overall quality, you will need to conduct further research into both companies to see if they are a good fit for your portfolio. As a good rule of thumb, you should always analyze multiple factors based on a wide range of metrics before choosing a company to invest in.

Diodes Incorporated and Semtech Corporation’s Momentum Grades

Company	Ticker	Momentum
Diodes Incorporated	DIOD	B
Semtech Corporation	SMTC	A

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Diodes Incorporated has a Momentum Score of 76, which is Strong. Semtech Corporation has a Momentum Score of 87, which is Very Strong.

The Momentum Grade Winner: Semtech Corporation

As you can clearly see from the Momentum Grade breakdown above, Semtech Corporation is considered to have stronger momentum compared to Diodes Incorporated. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Semtech Corporation could be a good stock to invest in. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Other Diodes Incorporated and Semtech Corporation Grades

In addition to Value, Quality and Momentum, A+ Investor also provides grades for Growth and Estimate Revisions.

Earnings estimate revisions scores take into account the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, surprises beget further surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Diodes Incorporated and Semtech Corporation pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Diodes Incorporated or Semtech Corporation Stock?

Overall, Diodes Incorporated stock has a Value Score of 24, Momentum Score of 76 and Quality Score of 79.

Semtech Corporation stock has a Value Score of 2, Momentum Score of 87 and Quality Score of 78.

Comparing Diodes Incorporated and Semtech Corporation’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.