Bluetooth Low Energy has a new top speed, at least on paper. The Bluetooth Special Interest Group (SIG) has announced the official adoption of Bluetooth High Data Throughput (HDT), a new physical layer for Bluetooth LE. According to the SIG's own feature page, it raises the maximum supported bit rate to 7.5 Mbps, which the SIG describes as nearly four times the Bluetooth LE 2M PHY.
Hackster.io covered the announcement on 5 November 2026. It reports that HDT is an optional part of the Bluetooth Core 7.0 specification and that the first devices are expected next year, starting with high-end wireless audio that uses high-resolution and lossless codecs. The headline figure needs one qualifier. Hackster describes it as up to 7.5 Mb/s "in ideal conditions". It is a maximum PHY bit rate, not a measure of how fast an application can move data over a real link.
What HDT actually is
HDT is a new PHY, the lowest layer of the radio stack. It defines how bits are put onto the air. Hackster describes it as a new PHY with a redesigned modulation scheme. Neither the SIG page nor Hackster's report, as summarised for this article, names the modulation or gives channel bandwidth, receiver sensitivity or range figures. PinoutFeed will not fill those gaps by guessing. Engineers who need those parameters will have to wait for the Core 7.0 specification text and for silicon vendors' datasheets.
The SIG makes five claims for HDT:
- Faster data transfer: a higher maximum bit rate, up to 7.5 Mbps.
- Increased capacity and spectral efficiency: more information carried per unit of spectrum.
- Better energy efficiency: the radio finishes sooner and can spend more time asleep.
- Enhanced reliability.
- Broader applicability: the SIG targets premium audio, immersive computing, industrial systems, peripherals and AI-enabled applications.
The energy argument is the familiar "race to sleep" logic. If a fixed payload moves at a higher bit rate, the radio is on for less time per transfer. Hackster, relaying the SIG, says this can reduce overall energy use by letting the radio finish sooner and spend more time in a low-power sleep mode. Whether a given product saves energy overall will depend on the silicon, the link conditions and the protocol overhead above the PHY. The announcement materials do not quantify any of these.
Why "nearly four times LE 2M" needs context
The comparison is between PHY bit rates: 7.5 Mbps for HDT against the LE 2M PHY. This is the right comparison for a PHY announcement, but it does not predict application throughput. On any Bluetooth LE link, the data that reaches an application is reduced by packet headers, inter-frame spacing, connection-interval scheduling, acknowledgements and retransmissions in a noisy 2.4 GHz-band environment. The SIG and Hackster both present 7.5 Mbps as a maximum or ideal-condition figure. Readers should treat it as a ceiling until independent measurements on shipping hardware are available.
Hackster's report also quotes SIG CEO Neville Meijers and Nordic Semiconductor's Øyvind Strøm. PinoutFeed has not verified any Nordic product, part number or availability date tied to HDT, and none is reported here.
Silicon is already surfacing
At least one chip that targets HDT was described publicly before the spec was adopted. In September, CNX Software covered Realtek's RTL8773J series, a dual-core microcontroller family. CNX lists these specifications for it:
- CPU: 200 MHz Arm Cortex-M55 with MVE (the M-profile Vector Extension), plus an Arm Cortex-M33
- DSP: dual HiFi 1s DSP at up to 400 MHz
- Memory: up to 2 MB SRAM, 8 MB PSRAM, and 4, 8 or 16 MB flash
- Radio: Bluetooth 6.2, plus pre-ratification Bluetooth 7 features: HDT, a proprietary Realtek-HDT+ mode claimed to reach up to 15 Mbps, Channel Sounding, a 1.25 ms short connection interval, and frame space update
Two caveats apply. First, CNX's report predates the SIG's adoption announcement, and it describes the Bluetooth 7 features as pre-ratification. Final compliance with the adopted Core 7.0 HDT definition will need to be confirmed when the part is qualified. Second, HDT+ is a Realtek extension, not part of the SIG standard. The 15 Mbps figure is Realtek's own claim. Like any proprietary mode, it will presumably only work between devices that implement it, and nothing in the sources says HDT+ will interoperate with other vendors' HDT radios. CNX notes that not every variant in the family supports HDT, and that there is still no publicly available developer documentation, firmware or development board. The sources give no price or availability date for the RTL8773J.
CNX lists earbuds, speakers, soundbars and gaming headsets among the target applications, which fits the SIG's and Hackster's expectation that HDT appears first in high-end audio. A Cortex-M55 with vector extensions and two HiFi DSP cores is a plausible configuration for that kind of product, where codec and signal processing take up much of the compute budget.
Who is HDT for?
The SIG's target list is broad: premium audio, immersive computing (XR), industrial systems, peripherals and AI-enabled applications. The near-term roadmap is narrower. Hackster reports that first devices are expected next year, starting with high-end wireless audio that uses high-resolution and lossless codecs. The SIG page calls premium wireless audio the first flagship application, with high-resolution and lossless audio as the use case.
The SIG page also points to everyday uses such as syncing data, transferring files and receiving firmware updates faster, and XR accessories and industrial sensors with bursty, high-volume data are plausible later candidates. The sources do not name any announced products in those categories.
What It Means for Makers
Status: HDT is an adopted, optional feature of Bluetooth Core 7.0, according to Hackster. It is a specification, not a product. No hobbyist development board, module or price has been announced in the sources for this article. Hackster reports that first devices are expected next year, led by high-end wireless audio.
Where it shows up first: expect HDT in audio and wearable SoCs, such as the Realtek RTL8773J described by CNX Software, well before it appears on the general-purpose BLE modules and dev boards that makers usually buy. Because the feature is optional, a "Bluetooth 7" or "Core 7.0" label on a future part does not guarantee HDT support. Check the datasheet for the HDT PHY explicitly.
What it replaces or enables: on paper, HDT gives LE links a much higher ceiling than LE 2M. That matters for projects that currently fall back to Classic Bluetooth, Wi-Fi or a wired link because BLE is too slow, for example streaming sensor arrays, moving firmware images or large files, or experimenting with high-quality audio. It does nothing for existing hardware. Both ends of the link need an HDT-capable radio, and anything that only supports LE 1M or 2M will keep using those PHYs.
Price and availability: the sources give no pricing or ship dates for HDT silicon or modules. The RTL8773J has been described publicly, but CNX lists no price or availability for it.
Treat the numbers carefully: 7.5 Mbps is the SIG's maximum PHY bit rate, described by Hackster as an ideal-conditions figure. Realtek's 15 Mbps HDT+ is a proprietary vendor claim. Neither is a measured throughput result. Wait for independent benchmarks on real silicon before designing around either figure.
