From "Separate" to "Integrated": A Comprehensive Comparison of Multi-Protocol Combination Modules and Single-Protocol Modules

I. Trend Background: Why is "combination" becoming the new normal?

IoT devices are becoming increasingly "all-rounders." A smart home control unit needs to connect to the cloud via Wi-Fi and also enable near-field network pairing with mobile phones via Bluetooth; an industrial gateway needs to connect to the local area network via Wi-Fi and also needs Bluetooth for on-site device debugging. This demand for "both...and..." is driving IoT communication modules from "single-protocol dedicated" to "multi-protocol convergence".

A multi-protocol module (combo module) refers to a single wireless SoC that supports multiple protocol stacks, providing multiple wireless communication capabilities simultaneously on the same module. The most common combination is Wi-Fi + Bluetooth , with other combinations such as ZigBee + BLE and Wi-Fi + ZigBee . A single-protocol module , on the other hand , focuses on a single communication standard, concentrating all hardware and software resources to serve only one protocol. Both have their advantages and disadvantages, and the selection decision directly affects the device's cost, power consumption, size, and development cycle.

二、Five Advantages of Multi-Protocol Combination Modules

1. Size and PCB Layout: From "Two RF Systems" to "One System Coexisting"

Using two independent single-protocol modules means requiring at least two sets of RF traces and two antennas. Multi-protocol modules consolidate the RF front-end, coexistence design, and interfaces onto a single SoC solution, significantly simplifying PCB layout. In the space-constrained environments of IoT devices, replacing two independent modules with a single module can reduce PCB area by more than 40% .

2. BOM Cost and Supply Chain Management: One less module, one less level of complexity

The multi-protocol module simplifies procurement and version management into a single part number, significantly reducing the complexity of supply chain management. Compared to three separate modules, the three-in-one module can reduce BOM costs by more than 30% .

3. Power Management: Unified scheduling is better than decentralized management.

The power state machine of the combined module makes it easier to implement a unified sleep/wake-up strategy at the driver layer, avoiding leakage current spikes caused by two independent chips operating independently. In contrast, the power management strategies of two independent modules are often difficult to coordinate precisely.

4. Certification and Compliance: Design Once, Test in a Coordinated Manner

The combined module narrows down the transmit power level, spectrum template, and coexistence scenarios to a more predictable range, allowing for comprehensive planning of the certification path early in the project. Compared to certifying two modules separately, the combined module can save more than 30% of certification time and cost .

5. User Experience: A Natural Match for the "Distribution Network-Connectivity" Interaction Model

In screenless IoT devices, the standard path has become "the mobile phone transmits the Wi-Fi SSID and password via Bluetooth → the device connects to the network via Wi-Fi". The combined module is naturally matched to this interaction model in terms of hardware , without the need for additional cross-chip communication overhead.

III. Four major limitations of multi-protocol combination modules

1. Performance compromises: the cost of shared resources

Wi-Fi, Bluetooth, ZigBee, and other mainstream wireless technologies coexist in the 2.4GHz ISM band. When they run simultaneously on a single chip, the multiple protocols need to share bandwidth, which may lead to potential increased latency and packet loss . Single-protocol modules concentrate all hardware resources to serve a single protocol, and generally perform better in terms of peak throughput and latency stability .

2. Limited flexibility: A change in one part affects the whole.

Combination modules "bundle" multiple protocols onto the same hardware platform. If a product needs to be upgraded to one of the protocols in the future, the entire module often needs to be replaced . Single-protocol modules , on the other hand, can upgrade only one protocol , making product iteration more flexible.

3. Integration complexity: Not "plug and play"

When different protocol stacks run on the same chip, a sophisticated time-division/frequency-division scheduling strategy is required to avoid self-interference. Developers need to handle complex issues such as priority management between protocols and coexistence strategy configuration. For inexperienced teams, this may actually prolong the development cycle.

4. The "hidden cost" of power consumption

In scenarios where multiple protocols operate simultaneously or alternately, the overall power consumption of combined modules is typically higher than that of single-protocol BLE-only designs . For devices powered entirely by batteries with minimal data transmission , single-protocol BLE modules are more competitive in terms of power consumption.

IV. Market Data and Industry Dynamics

Market data confirms the upward trend in combo modules. The global wireless module market is expanding at a CAGR of 12.9% , projected to grow from $7.92 billion in 2025 to $8.94 billion in 2026. In the combo chip segment, the global Wi-Fi/Bluetooth Combo chip market reached $18.76 billion in 2025 , a year-on-year increase of 14.2% . Smart home, industrial IoT, and automotive electronics are the three core drivers, with the automotive OEM market expected to reach an annual demand of 980 million units in 2027 .

27.4% year-on-year in 2025. It is predicted that the number of connected IoT devices globally will exceed 30 billion by 2026 , with a significant increase in the proportion of devices using multi-protocol connections.

Single-protocol modules will not disappear, but the market share of combined modules is expanding rapidly.

V. Ofeixin Technology: In-depth layout of multi-protocol combination modules

With multi-protocol combination modules rapidly becoming the industry mainstream, Ofeixin has built a complete product matrix covering multi-protocol combination modules such as Wi-Fi, Bluetooth, PLC, and IoT/AIoT , thanks to its years of experience in the field of wireless communication.

In the field of Wi-Fi + Bluetooth combo modules , Ofeixin has achieved full-speed, full-scenario coverage from Wi-Fi 4 to Wi-Fi 7. Its Wi-Fi + Bluetooth combo module product line possesses the following core advantages:

First, the speed coverage is comprehensive. From entry-level Wi-Fi 4/BLE combinations to flagship Wi-Fi 7/BLE 5.4 combinations, Ofeixin can provide precisely matched solutions for projects with different cost and performance requirements. The flagship combination module supports a 320MHz ultra-wide bandwidth , achieving high-speed wireless transmission at 5.8Gbps , while integrating the latest generation of Bluetooth Low Energy protocol; the mainstream Wi-Fi 6 series combination module supports 2x2 dual-band concurrent operation , with a stable speed of over 1200Mbps , balancing performance and cost-effectiveness.

Secondly, it boasts outstanding interface compatibility. Ofeixin's Wi-Fi + Bluetooth combo module comprehensively covers various mainstream host interfaces such as PCIe, USB, and SDIO , enabling flexible adaptation to main control chips on different platforms and greatly reducing customers' hardware porting and adaptation costs.

Third, it has mature multi-protocol concurrency capabilities. Through a sophisticated radio frequency coexistence scheduling algorithm, the combined modules of Ofeixin can achieve low-interference and low-latency collaborative work between Wi-Fi data transmission and Bluetooth scanning/connection , perfectly matching the classic interaction mode of "Bluetooth network configuration + Wi-Fi communication" for IoT devices, as well as multi-task scenarios such as concurrent Bluetooth audio, Bluetooth data transmission and Wi-Fi big data.

In terms of multi-technology integration and vertical scenarios , Ofeixin has further integrated Wi-Fi, Bluetooth, and PLC-IoT power line carrier technology. Its PLC-IoT module, based on the IEEE 1901.1 standard, supports a single CCO to connect 200 STA nodes and features dynamic routing and multi-path automatic addressing capabilities, achieving dual "wired + wireless" connectivity in smart home, smart lighting, and other scenarios. In addition, the company also provides Wi-Fi HaLow (based on IEEE 802.11ah, targeting low power consumption and wide coverage), Nearlink , and other multi-protocol modules, widely covering application scenarios such as smart homes, smart cities, industrial IoT, and connected vehicles.

From a technological perspective, Ofeixin's product portfolio precisely aligns with the industry's evolution from "single-protocol modules" to "multi-protocol combination modules." The company has obtained numerous core technology patents , and all its products have passed international certifications such as FCC, CE, and SRRC, as well as RoHS and REACH environmental directives. Today, with multi-protocol combination modules becoming the industry mainstream, Ofeixin is providing global IoT devices with a "one-stop" multi-protocol connectivity solution through its product system that covers all protocols, is compatible with multiple interfaces, and is adaptable to all scenarios .

VI. Selection Recommendations and Conclusion

The difference between multi-protocol combination modules and single-protocol modules is not a simple matter of superiority or inferiority, but rather a matter of different choices for different scenarios .

Scenarios where a combination module is preferred include: devices needing to work collaboratively between Wi-Fi and Bluetooth (such as smart home control); limited PCB area; high requirements for BOM cost and supply chain efficiency; and screenless devices requiring Bluetooth to assist Wi-Fi network pairing. Scenarios where a single-protocol module is preferred include: extreme requirements for peak performance of a single protocol; requiring only one communication method; purely battery-powered devices with extremely sensitive power consumption; and scenarios requiring flexible upgrades to a specific protocol without replacing the entire module.

The future is not about "combined modules replacing single-protocol modules," but rather "combined and single-protocol modules each finding their proper place." Combined modules, with their smaller size, lower BOM cost, and simplified supply chain, are becoming the mainstream choice for space- and cost-sensitive scenarios; single-protocol modules, on the other hand, remain irreplaceable in industrial control, professional communications, and other scenarios due to their superior peak performance and more flexible upgrade paths . For module manufacturers, having a complete matrix of both types of products is essential to meeting the diverse needs of different customers. The rise of multi-protocol combined modules is not a technological revolution, but an inevitable consequence of demand.