AOSL vs SMTC vs SLAB vs DIOD

For growth investors, Silicon Laboratories Inc.

(SLAB) is the stronger pick with 34. 3% revenue growth year-over-year, versus 4. 7% for Semtech Corporation (SMTC). Diodes Incorporated (DIOD) offers the better valuation at 78. 7x trailing P/E (48. 5x forward), making it the more compelling value choice. Analysts rate Alpha and Omega Semiconductor Limited (AOSL) a "Buy" — based on 11 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On forward P/E, Diodes Incorporated is actually cheaper at 48.

5x.

Over the past 5 years, Semtech Corporation (SMTC) delivered a total return of +89.

8%, compared to +23. 2% for Alpha and Omega Semiconductor Limited (AOSL). Over 10 years, the gap is even starker: DIOD returned +490. 7% versus AOSL's +172. 1%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Silicon Laboratories Inc.

(SLAB) is the lower-risk stock at 1. 25β versus Alpha and Omega Semiconductor Limited's 2. 81β — meaning AOSL is approximately 125% more volatile than SLAB relative to the S&P 500. On balance sheet safety, Diodes Incorporated (DIOD) carries a lower debt/equity ratio of 5% versus 102% for Semtech Corporation — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Silicon Laboratories Inc.

(SLAB) is pulling ahead at 34. 3% versus 4. 7% for Semtech Corporation (SMTC). On earnings-per-share growth, the picture is similar: Semtech Corporation grew EPS 86. 7% year-over-year, compared to -746. 2% for Alpha and Omega Semiconductor Limited. Over a 3-year CAGR, SMTC leads at 7. 1% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

Diodes Incorporated (DIOD) is the more profitable company, earning 4.

5% net margin versus -17. 8% for Semtech Corporation — meaning it keeps 4. 5% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: SMTC leads at 6. 8% versus -9. 0% for SLAB. At the gross margin level — before operating expenses — SLAB leads at 58. 2%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

On forward earnings alone, Diodes Incorporated (DIOD) trades at 48.

5x forward P/E versus 80. 4x for Silicon Laboratories Inc. — 31. 9x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for SLAB: -2. 8% to $211. 60.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, Silicon Laboratories Inc.

(SLAB) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 25), +375. 0% 10Y return). Alpha and Omega Semiconductor Limited (AOSL) carries a higher beta of 2. 81 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (SLAB: +375. 0%, AOSL: +172. 1%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: AOSL is a small-cap quality compounder stock; SMTC is a mid-cap quality compounder stock; SLAB is a small-cap high-growth stock; DIOD is a small-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.