Bluetooth HDT has been officially adopted by the Bluetooth SIG as an optional feature in Bluetooth Core Specification 7.0. The peak data rate of the Bluetooth Low Energy physical layer has increased from 2 Mbps to 7.5 Mbps, a 275% improvement. The first devices supporting HDT are expected to appear around early 2027, with the first flagship application targeting standardized high-end wireless audio. The key constraint is that HDT requires entirely new radio frequency hardware; existing Bluetooth modules cannot acquire this capability through firmware upgrades.
I. The Technical Essence of HDT Standard Implementation: Three Facts That Need to Be Clarified
On November 4, 2026, the Bluetooth Special Interest Group (SIG) officially adopted Bluetooth High Data Throughput (HDT) technology and incorporated it as an optional feature in Bluetooth Core Specification 7.0. This technology, by introducing a new physical layer (PHY), increases the peak bit rate of Bluetooth Low Energy from 2 Mbps to 7.5 Mbps while maintaining the 2.4 GHz band and 2 Msymbol/s symbol rate. It employs coherent π/4 QPSK, 8PSK, and 16QAM modulation combined with forward error correction.
Fact 1: 7.5 Mbps is the physical layer peak bit rate, not the actual application layer throughput available to the user. Actual speed is affected by multiple factors, including distance, interference, device RF capabilities, protocol overhead, and connection configuration. HDT defines five speed levels—2, 3, 4, 6, and 7.5 Mbps—of which 4 Mbps and below are mandatory, while 6 and 7.5 Mbps are optional. This means that a device's stated support for HDT does not necessarily mean it can run at the highest speed. When selecting a device, the key question is which specific speed level it supports, rather than simply looking at the general label "supports HDT."
Fact 2: The logic behind energy efficiency gains is "faster transmission, earlier sleep," but peak power consumption may increase. The Bluetooth SIG explains that when the same batch of data is transmitted in a shorter time, the time the RF circuit is in active transmission mode is reduced, and battery-powered devices have more time to maintain a low-power state. However, for wearable devices and sensors, changes in peak power consumption are also a design variable. This is not a simple equation of "faster = more energy-efficient"; actual power consumption performance needs to be verified through testing at the system level.
Fact 3: HDT is an optional feature. Bluetooth 7.0 devices are not automatically HDT devices, and existing hardware cannot achieve this through software upgrades. The Bluetooth SIG has clarified that existing GFSK-only devices cannot obtain HDT rates solely through firmware updates because the new physical layer requires new RF hardware support. A report by Taiwan's CTIMES further reminds users that even if a device is labeled as supporting Bluetooth 7.0, it is still necessary to verify whether HDT is implemented at both ends of the connection. This constraint directly impacts module selection: customers cannot assume that modules purchased today will gain HDT capability through OTA updates in the future.
From a market perspective, data from the Bluetooth Special Interest Group (SIG) market platform shows that global Bluetooth device shipments are projected to approach 6 billion units in 2026 and exceed 8 billion units in 2030 (data source: ABI Research, 2026). This massive existing device base and continuously growing shipment volume mean that HDT penetration will be a process measured in years, and the demand for existing Bluetooth 5.x/6.x modules will not suddenly disappear due to the emergence of a new standard. The transition period is long enough that module manufacturers and customers have time for rational planning, rather than panic-driven switching.
II. The Engineering Gap Between Chip-Level Progress and Modularization
Realtek's strategy at the HDT chip level is directly related to its supply chain with Oufexix, a module manufacturer. The RTL8773J series is positioned by Realtek as a "Bluetooth 7-ready" audio SoC, supporting Bluetooth 7 dual-mode technology (Classic + LE Audio) and HDT transmission, with a peak rate of 7.5 Mbps. Realtek has also implemented a proprietary HDT+ mode, claiming it can reach 15 Mbps. This chip uses a quad-core architecture (Cortex-M55 + Cortex-M33 + dual HiFi DSPs) and is targeted at products such as TWS earphones, gaming headsets, smart speakers, and AI glasses. According to Realtek's official website, its HDT transmission bandwidth is sufficient to support 24-bit/96kHz Hi-Res high-resolution and lossless audio.
Another noteworthy chip is the RTL8922D, Realtek's Wi-Fi 7 / Bluetooth 6.2 Combo chip. It also supports HDT mode for Hi-Res lossless audio transmission and integrates Channel Sounding indoor positioning capabilities. As a Combo solution, it has potential for integration with the existing Wi-Fi/Bluetooth module product line of OFEIXIN.
However, there is a clear engineering gap between chip-level products and module-level deliverable solutions. From SoC to mass-produced modules, RF front-end design, antenna matching and debugging, pre-certification testing (FCC/CE/SRRC), mass production ramp-up, and long-term supply commitments are required. The RTL8773J was first showcased at COMPUTEX in May 2026, and as of now, no reference design or turnkey solution for the general-purpose module market has been publicly released. As a module manufacturer, Oufexix is tracking the modular feasibility of Realtek's HDT chip solution. Only after RF design verification and certification paths are clear will it enter the product definition phase. Therefore, the advice to customers is not to "wait," but to make tiered judgments based on the project timeline .
III. OFEIXIN Selection Recommendations: Decision-making based on project mass production window
Projects slated for mass production by 2026 do not need to wait for HDT. Currently, OFEIXIN's Bluetooth 5.4/6.0 modules cover mainstream scenarios such as smart speakers, smart locks, industrial data acquisition, and wearable devices. Bluetooth 5.4's 2 Mbps PHY remains a sufficient baseline for audio streaming, sensor data synchronization, and OTA upgrades. Delaying product launches to wait for HDT, before HDT chip solutions mature and module prices stabilize, is not commercially viable.
Projects planned for the second half of 2027 should reserve a window for HDT evaluation during the chip selection phase. If the product roadmap points to mass production by the end of 2027 or early 2028, and the scenarios involve lossless/high-resolution audio, smart glasses sensor fusion, large file OTA, or high-speed industrial data backhaul, then when selecting a Bluetooth chip platform, it should be confirmed whether the platform has a clear HDT support roadmap and modularization timeline. Realtek's RTL8773J is an option worth considering, but it is necessary to confirm the module-level reference design and mass production ramp-up plan with the original manufacturer or authorized distributor. A CTIMES report also suggests that terminal manufacturers can prioritize scenarios with clear requirements, such as high-end audio or wearable data synchronization, and work with upstream and downstream partners to verify cross-brand interoperability, actual application throughput, and overall power consumption.
Do not believe claims that "existing module software can be upgraded to HDT." HDT requires new RF hardware, and existing devices that only support GFSK cannot achieve higher data rates through firmware updates. Any statement claiming that existing Bluetooth modules can support HDT via OTA upgrades is technically untenable. This judgment needs to be clearly communicated to customers to avoid making selection decisions based on flawed assumptions.
IV. Selection Q&A: Key Judgments During the HDT Transition Period
When customers are evaluating Bluetooth modules, the most common question they ask is, "Should we wait for HDT now?"
Depending on the project's mass production timeline: projects scheduled for mass production in 2026 do not need to wait, as HDT chip solutions are still in their early stages and modular products are not yet ready; waiting will only delay the market launch window. For projects planned after the second half of 2027, it is recommended to assess HDT support during chip selection and confirm the delivery schedule with the module supplier. Regarding the upgradeability of existing modules, it is clear that they cannot be upgraded—HDT introduces a new physical layer and requires new RF hardware, which existing modules cannot acquire through firmware upgrades. Which scenarios require HDT most? The Bluetooth SIG's first flagship scenario is high-end wireless audio, including lossless and high-resolution audio, multi-channel surround sound, and spatial audio. This is followed by low-latency interaction for XR/spatial computing, data exchange for AI edge devices, commercial and industrial automation monitoring, and fast OTA synchronization for wearable devices.
Regarding pricing, an accurate figure cannot be provided at this time. HDT initially appears as a high-end audio SoC, with Realtek's RTL8773J positioned for the TWS flagship and gaming headset market. Its cost structure differs from general-purpose BLE modules. OFEIXIN will evaluate its pricing strategy and share it with customers once the chip solution matures and modularization is feasible. In terms of current product coverage, OFEIXIN's Bluetooth 5.0 to 6.0 modules already cover smart home, wearable, and industrial terminal scenarios, making it a prudent choice for current projects until the HDT chip solution is available.
If your product is geared towards 2027, you should confirm three things with the chip manufacturer when selecting a chip now: whether the platform supports the HDT physical layer, whether there is a module-level reference design or turnkey solution, and whether the mass production schedule and long-term supply commitment match the project milestones—don't just look at the chip launch date, look at the module's delivery time.
