## Does Silicon Carbide Actually Make Sense in Humanoid Robots Right Now?

The short answer is no — not yet. But [UBTECH Robotics](https://humanoidintel.ai/companies/ubtech) and BASiC Semiconductor aren't selling today's robots. On August 19, 2026, the two Shenzhen-based, Hong Kong-listed companies signed a strategic cooperation agreement at the World Robot Conference in Beijing's Yizhuang district, targeting silicon carbide (SiC) power devices for humanoid robots. The Hong Kong Stock Exchange published a voluntary announcement the same evening. The deal also includes plans to deploy UBTECH robots on BASiC's own semiconductor production lines — a closed-loop arrangement that gives both parties real-world operating data.

The critical context: humanoid robots shipping in volume in 2026 — including UBTECH's own Walker S, [Unitree Robotics](https://humanoidintel.ai/companies/unitree-robotics) H series, Zhiyuan, and Galaxy General — run on 48V SELV architectures. On those platforms, SiC is essentially absent from the bill of materials. GaN HEMTs and silicon SGT MOSFETs dominate. The partnership is a forward position on an industry voltage migration that hasn't happened yet, not a component swap you'll see in next quarter's production run.

**Key numbers from the source:** 48V current standard; regenerative spikes to 80–90V; some industrial variants pushing toward 72V; 60V DC as the IEC/UL SELV safety threshold; 96V and 400V as projected future bus voltages; 30 to 40 [degrees of freedom](https://humanoidintel.ai/glossary/degrees-of-freedom) per humanoid robot; SiC junction temperature ratings of 175–200°C; GaN switching frequencies reaching 200kHz to 1MHz.

---

## Why 48V and GaN Currently Win — And Why That Won't Last

The 48V architecture isn't an engineering compromise — it's a deliberate safety choice. IEC/UL standards define 60V DC as the SELV threshold below which direct human contact doesn't cause electrical shock. A lithium battery system at 54.6V full charge, with regenerative spikes reaching into the 80–90V range, stays manageable within existing insulation and creepage distance specs. For a humanoid robot working alongside factory workers or assisting elderly users at home, that safety boundary is non-negotiable.

Within the 48V band, the power semiconductor landscape has already consolidated. Silicon SGT MOSFETs hold the cost-performance baseline for small and medium-power joints. GaN HEMTs — specifically in the 100–150V class — capture high-frequency, high-precision applications: [dexterous manipulation](https://humanoidintel.ai/glossary/dexterous-manipulation) in finger joints, high-bandwidth torque control in elbows and necks. The source cites TI's DRV7167A reference board and Innoscience's INNDMD48V25A1 (six 100V GaN devices forming a three-phase bridge) achieving over 98.5% efficiency at 1kW output in a 70mm-diameter joint cavity, cutting board area by more than half compared to silicon solutions. GaN has zero reverse recovery charge, which matters enormously for regenerative braking in joint drives.

Drop a 650V SiC MOSFET into this environment and the mismatch is stark. The voltage headroom is excessive — analogous, as the source puts it, to wearing body armor to play badminton. Package lead inductance drags switching performance. Unit pricing runs two to three times that of GaN. And crucially, GaN already has tens of thousands of logged hours in production deployments across Unitree, Zhiyuan, and UBTECH robots, with driver chips and reference designs fully validated. SiC has none of that ecosystem depth in the humanoid segment.

---

## The Actual Thesis: Humanoid Robots Will Follow the EV Voltage Curve

The EV industry analogy embedded in this deal deserves serious attention. Electric vehicles migrated from 400V to 800V bus architectures for a straightforward reason: I²R losses drop quadratically with voltage, wiring harnesses get thinner, and motor power density climbs. Humanoid robots are likely to follow an identical path as they move from human-collaborative scenarios into unmanned industrial zones.

The source draws a clean distinction between two future deployment profiles. The first is human-collaborative: home companionship, hospital inspection, mall guidance, education — where SELV constraints are hard limits and 48V stays dominant. The second is unmanned industrial: automotive final assembly lines, semiconductor cleanroom wafer cassette transport, heavy-load warehouse palletizing — where physical fencing and light curtains separate humans from robots, SELV is no longer a hard constraint, and pushing bus voltage to 96V or 400V becomes a rational engineering choice.

In the unmanned industrial scenario, SiC's three advantages finally materialize simultaneously: voltage margin for 400V-class systems, 175–200°C junction temperature tolerance for enclosed continuous-operation environments, and zero reverse recovery charge (Qrr) for regenerative braking efficiency. GaN's cost curve, meanwhile, steepens above 100V, and its thermal margin becomes problematic in long-duration, enclosed-shift operations.

The UBTECH-BASiC production line deployment is the mechanism for generating the data that validates this future thesis. By running Walker S units in BASiC's own semiconductor fabrication facility — itself a 24-hour, controlled, unmanned-compatible environment — both companies capture real thermal profiles, joint cycle counts, and power draw patterns at industrial duty cycles. That data is worth more than any laboratory simulation for validating a future high-voltage power architecture.

---

## What This Means for the Broader Industry

The deal is as much a capital markets positioning exercise as an engineering one. The source is explicit: BASiC Semiconductor markets itself as the "first SiC stock" on the Hong Kong exchange; UBTECH occupies the "first humanoid robot stock" position. The formal cooperation document, voluntarily disclosed to the HKEX the same evening it was signed, is designed to anchor both valuation narratives to the same future inflection point.

Skeptical read: the immediate technical impact is minimal. Nothing in this agreement changes the power semiconductor BOM of any humanoid robot shipping before 2027 at the earliest. The 48V-to-96V migration requires not just different MOSFETs but full motor controller redesigns, insulation class upgrades, and new safety certification paths — none of which happen on a press release timeline.

Constructive read: the industry precedent matters. When UBTECH — one of the few humanoid manufacturers with actual production volume in 2026 — publicly commits to a SiC roadmap with a tier-one supplier, it signals to the rest of the component ecosystem that high-voltage humanoid architectures are worth investing in. [Figure AI](https://humanoidintel.ai/companies/figure-ai) and others designing next-generation platforms will be watching whether the BASiC production line deployment yields publishable data on SiC performance under real industrial humanoid loads.

The fundamental question for any humanoid power electronics engineer is timing: how fast does the 48V-to-96V migration actually happen, and does it happen first in wheeled-legged hybrids or in fully bipedal platforms? Nothing in this agreement answers that — but it does ensure BASiC has a seat at the table when the answer becomes clear.

---

## Key Takeaways

- **UBTECH and BASiC Semiconductor signed a strategic SiC cooperation agreement on August 19, 2026 at the World Robot Conference in Beijing**
- **SiC is currently absent from humanoid robot BOMs** — 48V platforms favor GaN HEMTs and silicon MOSFETs; SiC's voltage headroom is excessive at this bus voltage
- **The IEC/UL 60V DC SELV threshold is the architectural constraint** keeping today's collaborative humanoids at 48V; that constraint relaxes in unmanned industrial zones
- **The deal's real bet is on 96V and 400V future bus voltages**, where SiC's voltage margin, 175–200°C thermal rating, and zero Qrr advantages finally justify the cost premium
- **The production line deployment serves dual purposes**: real-world data capture for high-voltage validation, and mutual capital markets narrative anchoring on the Hong Kong exchange
- **GaN maintains dominant position for the near term** — tens of thousands of logged hours in Unitree, Zhiyuan, and UBTECH joints versus zero for SiC in equivalent deployments

---

## Frequently Asked Questions

**Why don't humanoid robots use silicon carbide power devices today?**
Current volume humanoid robots operate on 48V SELV architectures, where SiC's 650V voltage rating is excessive, its switching performance is limited by package parasitic inductance, and its cost runs two to three times that of GaN alternatives. GaN HEMTs dominate high-frequency joint drive applications at this voltage level, with validated production deployments and a mature driver chip ecosystem.

**What is the SELV threshold and why does it matter for humanoid robots?**
IEC/UL standards classify 60V DC as the Safety Extra-Low Voltage threshold. Below this level, direct human contact does not cause electrical shock. Humanoid robots designed for human-collaborative environments — homes, hospitals, factories with human workers — must stay below this limit, which constrains battery architecture to roughly 48V nominal with controlled regenerative spike margins.

**When could humanoid robots migrate to 96V or 400V bus voltages?**
The source does not give a specific timeline. The migration is contingent on deployments in unmanned industrial zones where SELV constraints are lifted by physical safety barriers, and on motor controller redesigns, insulation upgrades, and new safety certifications — none of which are trivial. The UBTECH-BASiC production line deployment is intended to generate the real-world data that could accelerate this pathway.

**What does the UBTECH-BASiC production line deployment actually involve?**
UBTECH robots will be deployed on BASiC Semiconductor's own production lines, creating a closed-loop data capture environment. This gives both companies real industrial operating data — thermal profiles, joint cycle counts, power consumption patterns — under actual semiconductor manufacturing conditions, which are demanding 24-hour continuous-operation environments.

**Is this deal primarily technical or a capital markets play?**
Both. The source is explicit that UBTECH holds "first humanoid robot stock" status and BASiC holds "first SiC stock" status on the Hong Kong exchange, and that the formal HKEX voluntary announcement was filed the same evening the agreement was signed. The engineering thesis is sound but long-dated; the market signaling is immediate.