ON (onsemi) Stock Outlook 2026: SiC Power Chips vs the Auto Downcycle

The one question to answer before buying ON

onsemi is a company that hands investors a timing problem. The long-term story is clear enough. As electric vehicles and industrial electrification advance, the world needs chips that handle power more efficiently, and silicon carbide (SiC) sits right in the middle of that shift. The catch is that this long-term demand and the near-term earnings cycle currently point in opposite directions.

My read is this. ON wears two faces at once: a structural growth story and a cyclical semiconductor stock. Buy it for the first face alone and the revenue and margin decline of the auto correction will rattle you. Avoid it for the second alone and you miss the volume that SiC penetration will eventually stack on top. You have to hold both faces in your head before you size a position.

The question the market is genuinely fighting over is narrow: where is the trough in utilization and gross margin, and when does it get confirmed? That trough debate is the heart of ON’s volatility, and it is why long-term bulls and short-term bears look at the same company and reach opposite conclusions.

If you want the broader power-demand backdrop, the data-center electricity angle in my AI Stocks Investment Guide 2026 widens the picture.

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The business: two pillars, SiC power and image sensors

To understand ON you have to see how management reshaped it. The old onsemi was a low-margin, broad-line chipmaker selling every commodity part under the sun. Over the past few years the team culled low-margin product lines and concentrated resources on two higher-margin, higher-growth axes.

The first pillar is power semiconductors, especially SiC. In EV traction inverters, onboard chargers, and solar and energy-storage inverters, SiC tolerates heat and voltage better than silicon and runs more efficiently. onsemi is one of very few players vertically integrated from substrate wafer (its SiC boule-growth capability came through acquisition) through epi, device, and module. That integration becomes a weapon when SiC supply is tight, because it lets the company control cost and volume.

The second pillar is image sensors. onsemi holds a strong position in automotive CMOS image sensors. As ADAS and autonomy levels rise, the number of cameras per vehicle climbs. Industrial machine vision and inspection add more demand. Image sensors get less airtime than SiC, but they ride the same megatrend: rising semiconductor content per car.

Then there is the third growth attempt, the Treo analog platform. It aims to broaden the revenue base beyond a mix concentrated in SiC and sensors, into power-management and sensing analog parts. Mature analog markets grow slowly but carry steady margins, so Treo can act as a cushion against the cycle.

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What is pressing the stock down: the auto inventory-correction downcycle

onsemi’s largest end market is automotive. And auto and industrial chips, after the shortage frenzy of 2021 and 2022, swung into the opposite phase: an inventory-correction downcycle.

The mechanism is simple. When parts were scarce, carmakers and Tier 1 suppliers over-ordered chips and stockpiled them. As demand normalized, they cut new orders while they burned down that inventory. A supplier like onsemi sees revenue fall, and when utilization drops, fewer units absorb the fixed costs, so gross margin declines. That is the force weighing on earnings and the share price now.

Phase	Customer behavior	Impact on onsemi
Shortage (2021 to 22)	Over-ordering, stockpiling	Peak revenue and margin
Correction (now)	Cutting orders, burning inventory	Falling utilization and margin
Trough confirmed	Inventory normalizes, orders resume	Margin passes its low
Recovery	SiC penetration plus normal demand	Volume and margin rebound

The key point is that this decline happens not because demand vanished but because customers are using up what they already bought. Inventory cycles do not last forever. Once stock levels fall back to normal, orders resume, and the structural demand created by SiC penetration lands on top of that normal demand. So I read the current phase as structural growth temporarily masked by cyclical noise.

One caveat, though. This cycle overlaps with a genuine slowdown in the EV demand growth rate itself. A pure inventory problem would recover quickly, but layering in slower EV sales growth can lengthen the trough and flatten the recovery slope. Separating those two forces is essential.

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The competitive map: how ON differs from Infineon, ST, and Wolfspeed

Power semiconductors are far from onsemi’s stage alone. Strong rivals crowd the space. Here is how the positioning compares.

Company	Strength area	SiC position	Key risk
onsemi (ON)	SiC power plus automotive image sensors	Vertically integrated from substrate	Auto cycle and Chinese price competition
Infineon	Broadest power line and auto MCUs	Large SiC buildout, wide customer base	Scale makes it cycle-sensitive
STMicro	Balanced power, MCU, and sensors	Early SiC references such as Tesla	Exposed to simultaneous auto and industrial slowdown
Wolfspeed	SiC pure-play	All-in on SiC wafers and devices	Heavy capex and balance-sheet strain

Each has a different character. Infineon is the broadest power-semiconductor leader and a heavyweight in automotive microcontrollers, with scale and a wide customer base. Its business is more diversified than ON’s, so one wobbling axis gets cushioned. STMicro blends power, MCUs, and sensors and secured early SiC references, but it carries big exposure when industrial and automotive slow together. Wolfspeed is the pure SiC bet, which makes it the cleanest play on SiC growth but leaves it exposed to enormous capital spending and financial strain.

Within this field, ON’s relative strength is that it pairs SiC vertical integration with a genuine second growth axis in automotive image sensors. Its relative weakness is heavy automotive exposure, which makes it cycle-sensitive, and a business less diversified than Infineon or ST. Layered on top of all of them is the shared threat of low-cost Chinese suppliers.

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Chinese local competition and the margin-trough debate

You cannot discuss onsemi without China. Beijing is determined to localize its EV and industrial supply chains, and state-backed local chipmakers are adding capacity fast, from low- and mid-voltage power devices all the way to SiC.

Why is that a threat? First, price. When local suppliers fill the low- and mid-voltage device market at low cost, onsemi’s China revenue and margin feel it directly. Second, volume. If China keeps expanding SiC capacity, it can pull forward a global SiC glut and drive prices down, undermining the premise of the SiC bull case, namely tight supply.

For balance, a gap still remains in some areas. In 800V high-voltage devices, automotive-grade reliability, and the long qualification cycles that safety-critical parts require, local suppliers cannot follow instantly. How well onsemi defends this premium territory is the crux of its margin defense.

That is where the real margin-trough debate lives. Bulls argue that once utilization bottoms and the exit of low-margin products and SiC cost improvements play out, gross margin finds its floor and rebounds. Bears counter that Chinese price competition plus a SiC glut could hold margin lower for longer than expected. Which side is right will ultimately be settled by the utilization and margin trajectory in the quarterly numbers.

If you want a contrast with steadier income names, my SCHD Dividend ETF Guide 2026 frames the difference between cyclical growth and dividend compounding.

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The risks: balancing the bull case with a reality check

The long-term SiC story is attractive, but the following risks deserve serious weighing.

Auto and industrial cycle risk. The most direct one. Automotive and industrial drive most revenue, so when both end markets slow together, results swing hard. Treat this as a recurring feature of the business model, not a one-off headwind.

Chinese price competition and oversupply. Capacity additions by Chinese locals intensify price competition and can pull forward a SiC glut, threatening the tight-supply premise at the core of the SiC bull case.

Slowing EV demand growth. EVs are the biggest driver of SiC volume, yet EV sales growth is decelerating in several regions. If rising penetration fails to offset slower sales, the SiC growth slope flattens.

Customer concentration and the design cycle. Auto chips lock in for years once you win a design, but lose a socket and you forfeit years of revenue. Whether the design-win pipeline stays full determines long-term share.

Capex burden and execution risk. SiC expansion and vertical integration require heavy capital. If demand comes in softer than planned, new capacity can depress utilization further and squeeze margin, a genuine downside to aggressive buildout.

Cyclical valuation optics. Cyclical chips look expensive on earnings at the trough and cheap at the peak. Avoiding the stock because it looks expensive at the bottom, or loading up because it looks cheap at the top, is how you ride the cycle backwards.

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Practical scenarios for a US investor

Scenario 1: sizing it as a cyclical, not a pure growth name

If you slot onsemi into a growth portfolio, apply different rules than you would to a secular compounder. This stock rewards accumulating near cycle troughs and trimming into the recovery and peak. It is a contrarian name, not a momentum one, so the “buy strength, sell weakness” instinct works against you here.

A sensible frame: cap the single-name weight around 5% of the portfolio, and lean in when trough signals appear (utilization rebounding, gross margin passing its low). Rather than covering all your semiconductor exposure with ON alone, pair it with chip names or an ETF whose cycle runs on a different clock.

Scenario 2: holding period and tax treatment

For a US investor holding ON in a taxable account, the tax outcome hinges on holding period. Shares held more than a year qualify for long-term capital gains rates; sold inside a year, gains are taxed as ordinary income. Because onsemi pays little to no dividend, almost all of the tax impact comes from realized gains, so the holding-period decision matters more here than for a dividend payer.

On a volatile cyclical like this, tax-loss harvesting is a real tool. If the auto downcycle drags the position into a loss, realizing that loss to offset gains elsewhere, while staying mindful of the 30-day wash-sale rule before repurchasing, can improve after-tax returns. For tax-advantaged holders, an IRA sidesteps the annual tax drag entirely and can suit a name you intend to ride through a full cycle.

Scenario 3: cycle-linked entry and exit

Because ON is cycle-sensitive, a metrics-linked approach often beats a fixed-dollar drip. Watch the leading signals: US manufacturing surveys such as the ISM, auto production trends, and above all the inventory commentary in onsemi’s own quarterly calls.

The hard part is that turning points are difficult to call in advance. Utilization and margin often confirm a trough only after the stock has already begun to move, since the share price tends to price in demand shifts before the reported numbers do. So treat the stock itself as one of your leading indicators, and concentrate on inventory normalization and utilization rather than waiting for a clean earnings beat.

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Monitoring onsemi: the metrics to watch each quarter

If you own or track ON, deciding in advance what to read first makes each quarter far clearer.

First, SiC revenue growth. SiC is the heart of the long-term story. Even when total revenue swings with the cycle, steady SiC penetration is the evidence of structural growth. If SiC growth starts missing expectations, the bull premise wobbles.

Second, automotive and industrial customer inventory. Read management commentary and order flow for signs that customer inventory is normalizing. A signal that stock has neared normal levels means order resumption and a revenue rebound are close.

Third, factory utilization. Utilization is a leading indicator for margin. Once it bottoms and turns up, fixed-cost absorption improves and gross margin follows.

Fourth, the gross margin trough. The most contested number of all. Watch where gross margin bottoms and whether that low sits inside the company’s stated target range. A trough lower than expected tips weight toward the China-competition and oversupply scenario.

Fifth, new design wins. Auto and industrial chips book years of revenue with each design win. Whether SiC and image sensors keep stacking new sockets sketches out revenue two to three years ahead. A drying design-win pipeline darkens the future no matter how good current results look.

Read these five together and you can track, beyond the headline revenue figure, where the cycle stands and whether long-term growth is still intact.

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Further reading

• AI Stocks Investment Guide 2026: Selecting Core Names and ETFs
• SCHD Dividend ETF Guide 2026: A Dividend-Growth Strategy
• US Stock Capital Gains Tax Guide 2026

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This article is an investment opinion written for informational purposes only and does not recommend buying or selling any specific security. Investing in stocks carries the risk of loss of principal, and investment decisions should be made independently in light of your own financial situation and risk tolerance. The business conditions and outlook of any company mentioned reflect the time of writing; always verify the latest disclosures and consult a professional before investing.