What exactly does it mean when a SiC wafer production line is upgraded from "6-inch" to "8-inch"?
Is it a numbers game of capacity, or a disruptive technological strike? Is it a hype gimmick in the capital market, or an opportunity to reshape the industrial landscape?
On September 17, with the release of an announcement by Sinocera, the name Advanced Semiconductor Innovation was once again pushed into the spotlight. However, hidden within this seemingly mundane announcement is far more than just the four words "upgrade and line release".
It is like a key, attempting to open the door to the 8-inch era; it is also like a touchstone, testing the determination of China's SiC industry to transition from "romanticism" to "realism".
First and foremost, let's look at the phrase in the announcement: "The 6-inch to 8-inch SiC wafer production line has completed its upgrade and line release".
I believe this is not merely a cheerful piece of news, but a heavy hammer knocking on the door of the 8-inch era. Behind this lies a brutal game of capacity elimination and supply chain restructuring.
Many people's eyes light up at the mere sight of the words "line release," assuming Advanced Semiconductor Innovation is about to turn on the money-printing machine. But if you truly read and understand this announcement, you will find that the line release is actually the least valuable piece of information. What is truly valuable are those few letters hidden between the lines: PCN.
This announcement is Advanced Semiconductor Innovation's "letter of commitment" handed to the market. This is not just an upgrade of a production line, but a bold gamble by Advanced Semiconductor Innovation to redefine its industry standing in the 8-inch era.
Why the relentless push for 8-inch?
This question might seem somewhat redundant in 2026, but the underlying logic is brutal. In the 6-inch era, companies competed on yield, process technology, and who could drive costs down the lowest. In the 8-inch era, this is no longer a multiple-choice question, but a matter of survival.
This time, Advanced Semiconductor Innovation played a "disruptive strike" by directly converting its existing 6-inch line into an 8-inch one. This is a smart move, but it carries significant risks. The smart part is that it avoids the long cycle and massive capital expenditure of building a new fab, leveraging the maximum capacity with minimal cost. The risk lies in the fact that equipment compatibility and process stability of the old production line are like the Sword of Damocles hanging over its head.
The announcement mentions the "completion of the fifth-generation planar gate SiC MOSFET process development." Note that it is "planar gate," not "trench gate." In the current industry atmosphere where everyone universally pursues the performance limits of trench gates, this seems somewhat "unconventional." But it is precisely this "unconventional" approach that exposes Advanced Semiconductor Innovation's real strategy: it does not pursue ultimate parameters; it pursues ultimate reliability and consistency.
Sinocera September 2026 Investor Relations Activity Record Report
A planar gate is like a kitchen knife that has been sharpened countless times. Although it is not as flashy as a new surgical scalpel, it is robust, durable, and versatile. For automotive-grade chips, stability overrides everything. Advanced Semiconductor Innovation is using a seemingly conservative technical route to win the maximum trust of automakers. Its bet is that while others are still struggling with the reliability of trench gates, its planar gate products may already be mass-produced and installed in vehicles.
Here, a timeline needs to be added. In Sinocera's announcement in May this year, Advanced Semiconductor Innovation's process platform was referred to as "H4M," with the announcement stating, "In 2025, complete the process line upgrade from 6-inch to 8-inch, complete the development of the H4M platform, and pass the AEC-Q101 standard for reliability testing of multiple products." In the announcement on September 17, it was officially confirmed that the "development of the fifth-generation planar gate process is completed," while also specifying that "in 2026, the development of the 8-inch H5M process will be completed, and product performance will be further improved."
Therefore, we can infer that H4M corresponds to the fourth-generation, 6-inch to 8-inch transition platform, and the fifth-generation planar gate is exactly the H5M generation. The fifth generation did not appear out of thin air; it is the natural iteration after H4M was run through, validated, and installed in vehicles.
This generational relationship is key to judging Advanced Semiconductor Innovation's technological pace. More importantly, the H4M generation has already delivered a solid answer sheet: the fourth-generation SiC MOSFET process has completed comprehensive reliability verification, and the actual failure rate at leading automakers has been controlled within 1 ppm.
What is the concept of 1 ppm? It means allowing less than one failure out of a million units. This data is not a theoretical value from a laboratory, but an actual performance record achieved after being installed and driven in vehicles. It demonstrates that Advanced Semiconductor Innovation's planar gate route is not "backward because it is conservative," but "reliable because it is conservative."
However, to be fair, 1 ppm is not the endpoint of "good quality," but an entry ticket. Leading automakers are now pushing towards 10 ppb (parts per billion), which is the true threshold for the next-generation 800V high-voltage platform.
*On the afternoon of September 21, the News Office of the Shunyi District People's Government and the Shunyi "Two Zones" Work Leading Group Office jointly organized the Shunyi District 2026 "Two Zones" Construction Press Conference. Liu Xiangwu, General Manager of Beijing Advanced Semiconductor Innovation Co., Ltd., introduced the company's latest progress at the meeting.
Let's look at this sentence again: "Multiple 8-inch automotive-grade chips have been produced and delivered to leading automakers for trial verification." This is one of the most thought-provoking sentences in the entire announcement, and also the one most easily misinterpreted by many media outlets.
"Delivered to leading automakers" sounds great, but the four words "trial verification" are the real touchstone. In the SiC industry, from A-samples and B-samples to C-samples, from DV (Design Verification) to PV (Process Verification), and finally to PPAP (Production Part Approval Process), every step is a critical hurdle.
The fact that Advanced Semiconductor Innovation dares to hand over 8-inch SiC chips to "leading automakers" indicates that its products have at least passed the automakers' "initial interview," which is the performance testing at the laboratory stage. But this is merely the first step of a long journey. The verification cycle for automakers can be as short as one year or as long as two years. During this period, any minor flaw could lead to all previous efforts being in vain.
There is an easily confused point here: Advanced Semiconductor Innovation's 6-inch SiC chips are no longer in the "trial" stage at multiple leading automakers. The latest news shows that multiple specifications of SiC products have completed verification by several leading automakers and have achieved mass supply.
*Liu Xiangwu introduced: Currently, the company's full range of 650V-2300V SiC chips and devices have achieved mass shipment. The 3300V medium and high-voltage products have completed sample R&D testing, and multiple leading automakers have completed product verification and achieved mass supply. SiC MOSFETs have achieved mass production applications at leading automakers. SiC modules have signed supply agreements and are continuously supplying key customers in fields such as NEVs (New Energy Vehicles), industrial power supplies, and new energy inverters. The R&D and production of SiC power electronics products have achieved mass supply in OBC (On-Board Charger) applications at leading automakers, with the market share expanding year by year. They have also been recognized by multiple automakers in main drive applications, passing performance and reliability verification.
Note that the announcement specifically mentioned "simultaneously advancing reliability verification for leading automakers, charging pile, and industrial power supply customers." See? Advanced Semiconductor Innovation's strategy remains "blooming in multiple points." Because charging piles and industrial power supplies have relatively shorter verification cycles and faster cash collection, they can serve as the "training ground" and "cash cow" for 8-inch chips.
If line release is drawing the sword, and verification is sparring, then the phrase in the announcement "carrying out relevant work for PCN changes" is the crucial move quietly laid out by Advanced Semiconductor Innovation. Only when this piece is placed does the entire chess game truly come alive.
What is a PCN? Simply put, it is a "Product Change Notice." In the semiconductor industry, especially for automotive-grade chips, any change, even replacing a testing machine, changing a packaging material, or just altering the temperature and humidity in the workshop, requires submitting a PCN to the customer, undergoing strict re-verification and approval by the customer.
The fact that Advanced Semiconductor Innovation is now working on PCNs means it is solidifying the process on the 8-inch production line from an "experimental state" to a "mass production state." It is turning the processes that have been run through in the laboratory into replicable and mass-producible "Standard Operating Procedures."
This is the real "leap of faith." Line release only proves that the machines can run; PCN proves that you can stably, consistently, and on a large scale produce qualified products. The fact that Advanced Semiconductor Innovation dares to initiate PCNs shows that it has considerable confidence in its own process stability. Once this step is taken, it will no longer be an "8-inch concept stock," but a true "8-inch player."
Where does the confidence for this step come from? It comes precisely from the track record mentioned earlier. When your fourth-generation products have achieved a 1 ppm failure rate at leading automakers and a cumulative installed volume of 8 million vehicles, you then have the qualification and data to discuss PCNs with automakers.
*PCN Definition Table
Many people only focus on front-end wafer manufacturing, ignoring back-end packaging and testing.
There is another sentence in the announcement that should not be missed: "The first phase of the packaging and testing platform has completed construction, and the SiC high-voltage power module production line has been successfully released."
This sentence carries a huge amount of information. It means Advanced Semiconductor Innovation does not just want to be a "wafer supplier" selling bare dies; it wants to be a "module supplier." In the SiC industry, the gross margin of selling modules is much higher than selling bare dies. Advanced Semiconductor Innovation's move is clearly intended to open up the path of vertical integration for "chips + modules."
The "high voltage" in "SiC high-voltage power modules" implies higher technical barriers and higher added value. With the 800V high-voltage platform becoming the mainstream today, whoever can master high-voltage modules may hold the lifeline of the next-generation electric vehicles.
With this step, Advanced Semiconductor Innovation directly places itself on the arena to compete with leading industry players for the high-end market. The reason for making this move is backed by Sinocera's original business. Founded in Shijiazhuang in 2009, Sinocera's controlling shareholder is the 13th Institute of CETC (Academy of Industrial Fundamentals). Its earliest main business was manufacturing electronic ceramic packages for optical communication devices, wireless power devices, infrared detectors, and high-power lasers. These packages directly affect the heat dissipation, airtightness, and long-term reliability of the devices.
What SiC MOSFET modules fear most are heat dissipation and parasitic parameters, and ceramic packages and substrates happen to be Sinocera's strengths. Integrating device design, packaging shells, and module assembly into one system leaves room for synergy in yield and cost. This is why Advanced Semiconductor Innovation dares to move directly from "selling bare dies" to "selling modules." It is not a sudden impulse, but because they already have that piece of the puzzle at home.
"Accelerate the installation and debugging of new equipment, iterate and optimize processes, and simultaneously improve supporting capabilities such as KGD and wafer-level burn-in." Translated, this means: I am frantically buying equipment, frantically debugging processes, and I want to max out capacity.
KGD (Known Good Die) and wafer-level burn-in are two "critical hurdles" standing in front of all SiC players.
Many people think that as long as a wafer fab can run the wafers through and measure the parameters, it has achieved mass production capability. This might hold true for logic chips or mature processes, but in the world of SiC, this "electrified sand," this is merely the first step of a long journey. Advanced Semiconductor Innovation explicitly wrote these two points into the announcement because it knows that automakers and Tier 1 customers do not want "perfect samples in the laboratory," but "stable products on the production line."
*Advanced Semiconductor Innovation Capacity Layout (Based on Public Information Compilation)
Let's talk about KGD first. In the era of traditional silicon-based power devices, the chip yield before packaging was usually as high as over 99%, making KGD more of an "icing on the cake" step. But in the SiC field, due to issues such as substrate defects, epitaxial uniformity, and gate oxide integrity, the bare die yield often has to be discounted.
If you package an unscreened SiC chip into a module, install it in a vehicle, and it fails in a high-temperature and high-humidity environment after running for thousands of kilometers, what blows up is not just the module, but the entire automaker's trust in you. KGD solves this "black box" problem: before packaging, through wafer-level testing, chips with marginal electrical parameters and potential defects are screened out in advance.
Advanced Semiconductor Innovation's emphasis on KGD shows that it has evolved from the stage of "being able to make good chips" to "being able to screen out bad chips." This is a kind of awe towards failure modes and a responsibility towards the customers' wallets.
Then there is wafer-level burn-in, which is the "touchstone" for SiC automotive-grade mass production.
The failure of SiC devices often exhibits the characteristics of "early failure"—chips with tiny pinholes in the gate oxide and high interface state density may test perfectly normal at room temperature, but once exposed to High Temperature Reverse Bias (HTRB) or Temperature Cycling (TC) environments, problems will quickly surface.
Traditional burn-in testing is conducted after packaging, but the packaging cost of SiC modules is extremely high. If you wait until after packaging to find out the chip is bad, the waste is not only the chip itself, but also the expensive AMB (Active Metal Brazing) substrates, silver sintering materials, and packaging man-hours. Wafer-level burn-in applies high-temperature and high-voltage stress to the chips at the wafer stage, artificially accelerating their "early failure" process, and detonating those "time bombs" before they leave the factory.
Advanced Semiconductor Innovation's willingness to face wafer-level burn-in head-on shows that it has considerable confidence in its gate oxide process and interface state control, daring to show its "hole cards" in front of customers.
In my opinion, this attitude of not pretending to be more capable than one is, is indeed a breath of fresh air in the current SiC industry. Over the past few years, we have seen too many companies daring to claim "mass production" and "supply" as soon as their production lines are released, turning "sample delivery" into "design win" and "verification" into "vehicle installation." This exaggerated trend not only misleads the capital market but also overdrafts the industry's reputation.
In Advanced Semiconductor Innovation's announcement, there are no grand words about "filling the domestic gap" or "global leadership," only solid industrial language such as "accelerating equipment debugging," "improving supporting capabilities," and "carrying out PCN changes." It candidly tells the market: I am preparing for mass production, I have encountered difficulties, but I am solving them.
This pragmatic posture is precisely the hallmark of a company transitioning from "technology-driven" to "commercial maturity." It understands that in the track of automotive-grade SiC, slow is fast, and steady is fierce.
Therefore, Advanced Semiconductor Innovation's 8-inch line is not just a simple production line.
It is the letter of commitment handed over by a "follower" who has endured for many years, and a farewell sword waved towards the 6-inch red ocean. As this move is made, a "three-dimensional war" revolving around technical routes, capacity scale, and customer trust is inevitable.
But industrial laws never believe in tears. Line release does not equal mass production, delivery does not equal design win, and verification certainly does not equal passing the checkpoint. Standing before Advanced Semiconductor Innovation are still the steep climb of the yield curve, the long ordeal of automotive-grade certification, and the heart-stopping step-by-step release of capacity.
Today, Advanced Semiconductor Innovation has completed its process development, and the production line has been released. But the real tough battle has just begun. This is a battle Advanced Semiconductor Innovation cannot afford to lose. Because what it is betting on is not just a few production lines, but the right to speak for the entire Chinese SiC industry in the 8-inch era.
Finally, let me add a few more words. Advanced Semiconductor Innovation's 6-to-8 conversion line actually reflects the most authentic underlying tone of the domestic third-generation semiconductor industry.
As far as I know, many places in China are currently revitalizing 6-inch SiC lines: some production lines were forced to go online during the SiC boom back in the day, but failed to pass customer verification and yield didn't climb, leaving the machines idle for half a year; some 6-inch lines were never profitable anyway, so they can only avoid dismantling the fab, tweak the equipment, and continue making medium and low-voltage devices for charging piles and industrial power supplies, as long as they can produce wafers and keep the machines running; and others are taken over by local state-owned capital, first getting the production line running to preserve the supply chain and team, and then slowly discussing upgrades.
"Revitalizing 6-inch" is becoming a quiet business in the industry: the goal is not breakthrough, let alone leadership, but simply "thank God, don't let me die."
Advanced Semiconductor Innovation is different. It is also converting 6-inch to 8-inch, but not out of "necessity driving change," rather "using the family wealth accumulated in the 6-inch era to exchange for an 8-inch ticket." It is not starting from scratch to tackle 8-inch, but seamlessly "migrating" the original automotive-grade quality system, failure database, customer trust, and planar gate process foundation onto larger wafers.
When others convert lines, it is to keep old capacity from lying idle; when Advanced Semiconductor Innovation converts lines, it is to let old credit continue to generate interest.
This is the most crucial lesson that China's SiC industry should understand:
In my opinion, 8-inch is not the magic for "new players to counterattack," but the examination room for "old players' compound interest."
Without the tuition paid, failures compensated for, and automotive-grade documents run through in the 6-inch era, the more 8-inch lines are released, the more depreciation becomes a meat grinder.
What is truly valuable is not the wafer changing from 150mm to 200mm, but whether you actually have the ability to convince customers that: after you get bigger, you are still as stable as that chip that didn't have any problems back in the day.
Therefore, the industrial significance of Advanced Semiconductor Innovation's 6-to-8 conversion has never been just about "cutting 78% more dies."
It proves one thing: domestic SiC does not have only the single path of "building new 8-inch fabs."
Old lines can be converted, institute systems can be transformed, automotive-grade data can be inherited, packaging and testing modules can be supplemented, and PCN/KGD/wafer-level burn-in can be made up later.
But the premise is, bro, don't fool around in those previous years! Don't write "sample delivery" as "mass production," don't write "line release" as "capacity reached," and don't make industry people shake their heads as soon as they hear the name.
Therefore, I believe that the least sexy part of Advanced Semiconductor Innovation is precisely the most valuable part:
It pulls SiC back from a "concept industry" to the "entity of manufacturing": production lines need depreciation, yield needs to climb, customers take three years, failures require accountability, changes require official documents, and modules require warranty compensation.
In the next two years, a batch of 8-inch SiC lines will be lit up one after another in China.
Some will become the main force for main drive chips, some will turn into medium and low-voltage device bases, and some will stop at the stage of "line release is news, mass production is a mystery."
And the sample given by Advanced Semiconductor Innovation is:
Don't rush to change tables; first, clear the accounts on the old table; only when the accounts are clear and you move to the 8-inch table, will people sit down and talk with you.
The next leg of domestic SiC does not belong to those who shout "Long live 8-inch," but to those who have endured winter testing in 6-inch, revised documents in PCNs, been scolded in automakers' quality departments, and still dare to write KGD and wafer-level burn-in into announcements.
Advanced Semiconductor Innovation may not necessarily laugh to the end, but its 6-to-8 path has already made it very clear to the industry "what it means to seriously do automotive-grade SiC."
References:
[1] Sinocera
[2] Beijing Shunyi