WCN 3991 Mobile Phone IC
High-Performance IC for Mobile Devices
The WCN 3991 Mobile Phone IC is designed to meet the evolving needs of modern smartphones and mobile devices. Built with cutting-edge technology, this chip enhances connectivity and performance, ensuring seamless wireless communication. Whether you’re looking for faster internet speeds or more secure alerts from your mobile, the WCN 3991 serves as an essential solution for superior device functionality. WCN 3991 Mobile Phone IC
Advanced Features and Specifications
This high-performance IC integrates the best of hardware efficiency and software intelligence to deliver exceptional performance. Packed with innovations, the WCN 3991 supports multiple wireless standards and offers reliable support for Wi-Fi, Bluetooth, and GPS technologies. Its compact size ensures an easy fit into various device designs, making it versatile across smartphone models and other mobile products. Additionally, its energy-efficient design contributes to increased battery life. WCN 3991 Mobile Phone IC
Why Choose the WCN 3991 IC?
With the WCN 3991 Mobile Phone IC, manufacturers can offer their customers faster, more secure, and highly efficient devices. This product is ideal for those aiming to deliver a competitive edge in the mobile market by offering premium connectivity solutions. Whether you’re a device manufacturer or a tech enthusiast, the WCN 3991 is a game-changing choice for contemporary wireless communication.
The WCN3991 is a highly integrated wireless connectivity Integrated Circuit (IC) developed by Qualcomm, part of the FastConnect 6200 mobile connectivity subsystem.1 It is a critical component in many mid-to-high-end smartphones, notably within the Xiaomi and Oppo ecosystems (e.g., Redmi Note 9 Pro, Mi 10). WCN 3991 Mobile Phone IC
The chip is designed to handle multiple wireless protocols simultaneously, reducing the PCB footprint and power consumption by combining Wi-Fi, Bluetooth, FM Radio, and GNSS into a single silicon die. WCN 3991 Mobile Phone IC
WCN3991 Full Specifications
| Category | Specification Details |
| Product Name | Qualcomm WCN3991 (FastConnect 6200 Series) |
| Connectivity Standards | Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n), 802.11a/b/g |
| Wi-Fi Spectral Bands | 2.4 GHz and 5 GHz (Dual Band) |
| MIMO Configuration | 2×2 MIMO (Multiple Input Multiple Output) |
| Spatial Streams | Up to 2 Spatial Streams |
| Wi-Fi Peak Speed | Up to 867 Mbps (at 80 MHz channel width) |
| Bluetooth Version | Bluetooth 5.1 / 5.2 (model variant dependent) |
| Bluetooth Features | BLE (Low Energy), Dual-mode BT, aptX Audio support |
| Location Services | GNSS (GPS, GLONASS, BeiDou, Galileo) |
| Additional Radio | Integrated FM Radio Receiver (76–108 MHz) |
| Process Technology | Advanced Low Power CMOS |
| Package Type | 116-ball WLPSP (Wafer Level Chip Scale Package) |
| Operating Temp | -40°C to +105°C |
| Host Interfaces | SDIO 3.0, UART, SPI, I2C, GPIO |
Key Features & Capabilities
1. Wi-Fi 6-Ready Features4
While the WCN3991 is primarily a Wi-Fi 5 (802.11ac) chip, it incorporates several “Wi-Fi 6-ready” features from the FastConnect 6200 family. This includes 8×8 sounding, which improves the capacity of Wi-Fi 6 Access Points when they communicate with this device.5 It also supports Target Wake Time (TWT), which significantly reduces power consumption (up to 67%) by allowing the chip to negotiate when and how often it wakes up to send or receive data.6
2. Dual-Band Simultaneous (DBS)7
The IC supports 2×2 MIMO with DBS, allowing the phone to connect to both 2.4 GHz and 5 GHz bands at the same time. This is particularly useful for reducing latency in mobile gaming and improving the reliability of high-definition video streaming.8
3. Advanced Audio & Bluetooth
With support for Bluetooth 5.1/5.2, the WCN3991 provides stable connections for “True Wireless” earbuds.9 It often works in tandem with Qualcomm’s aptX™ audio technology to deliver CD-quality sound over wireless connections while maintaining low latency.
4. Power Management
The chip is optimized for mobile longevity.10 It uses advanced sleep modes and efficient RF front-end management to ensure that keeping Wi-Fi or Bluetooth “ON” doesn’t drain the battery rapidly.11 This makes it a preferred choice for slim smartphones where battery space is limited.
Typical Usage & Hardware Integration
In a mobile phone teardown, you will usually find the WCN3991 located near the Snapdragon processor (such as the Snapdragon 720G or 865). It acts as the “radio brain” for all non-cellular wireless signals.
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