AOSL vs ON vs DIOD vs POWI vs MPWR

For growth investors, Monolithic Power Systems, Inc.

(MPWR) is the stronger pick with 26. 4% revenue growth year-over-year, versus -15. 3% for ON Semiconductor Corporation (ON). Diodes Incorporated (DIOD) offers the better valuation at 77. 9x trailing P/E (42. 6x 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 trailing P/E, Diodes Incorporated (DIOD) is the cheapest at 77.

9x versus ON Semiconductor Corporation at 355. 9x. On forward P/E, ON Semiconductor Corporation is actually cheaper at 33. 7x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Monolithic Power Systems, Inc.

(MPWR) delivered a total return of +404. 2%, compared to -1. 3% for Power Integrations, Inc. (POWI). Over 10 years, the gap is even starker: MPWR returned +25. 3% versus AOSL's +175. 4%. 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), ON Semiconductor Corporation (ON) is the lower-risk stock at 1.

91β versus Alpha and Omega Semiconductor Limited's 2. 91β — meaning AOSL is approximately 52% more volatile than ON relative to the S&P 500. On balance sheet safety, Monolithic Power Systems, Inc. (MPWR) carries a lower debt/equity ratio of 1% versus 45% for ON Semiconductor Corporation — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Monolithic Power Systems, Inc.

(MPWR) is pulling ahead at 26. 4% versus -15. 3% for ON Semiconductor Corporation (ON). On earnings-per-share growth, the picture is similar: Diodes Incorporated grew EPS 50. 5% year-over-year, compared to -746. 2% for Alpha and Omega Semiconductor Limited. Over a 3-year CAGR, MPWR leads at 15. 9% 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.

Monolithic Power Systems, Inc.

(MPWR) is the more profitable company, earning 22. 1% net margin versus -13. 9% for Alpha and Omega Semiconductor Limited — meaning it keeps 22. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: MPWR leads at 26. 1% versus -4. 1% for AOSL. At the gross margin level — before operating expenses — MPWR leads at 55. 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, ON Semiconductor Corporation (ON) trades at 33.

7x forward P/E versus 67. 2x for Monolithic Power Systems, Inc. — 33. 6x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for AOSL: 13. 5% to $43. 00.

In this comparison, POWI (1.

1% yield), MPWR (0. 4% yield) pay a dividend. AOSL, ON, DIOD do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, ON Semiconductor Corporation (ON) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1033% 10Y return).

Monolithic Power Systems, Inc. (MPWR) carries a higher beta of 2. 27 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ON: +1033%, MPWR: +25. 3%), 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; ON is a mid-cap quality compounder stock; DIOD is a small-cap quality compounder stock; POWI is a small-cap quality compounder stock; MPWR is a mid-cap high-growth stock. POWI pays a dividend while AOSL, ON, DIOD, MPWR do not, making them suitable for different income and tax situations. 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.