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5261B-SR Wi-Fi Module

MT7661RSN 5G
SDIO V3.0 2T2R
BT5.0/ BLE5.0
13.0 X 15.0mm
  • 2.4G+5G 
  • BT5.0 and above 
  • MTK 
  • 2T2R 
  • Select 
  • SDIO Interface 

Product Name

MT7661RSN Wi-Fi Module 5261B-SR


5G Wi-Fi



BT5.0/ BLE5.0

13.0 X 15.0mm

Details Information


Fn-Link Technology would like to announce a low-cost and low-power consumption module which has all of the Wi-Fi and Bluetooth functionalities. The highly integrated module makes the possibilities of web browsing, VoIP, Bluetooth headsets applications. With seamless roaming capabilities and advanced security, also could interact with different vendors’ 802.11a/b/g/n/ac 2x2 Access Points in the wireless LAN. 

5261B-SR module complies with IEEE 802.11 a/b/g/n/ac 2x2 dual-band Wi-Fi subsystem and a Bluetooth subsystem. The Wi-Fi subsystem contains the 802.11 a/b/g/n/ac radio, baseband, and MAC that are designed to meet both the low power and high throughput application. 

5261B-SR has a 32-bit RISC MCU that handles Wi-Fi and Bluetooth tasks, and an ARM Cortex-R4 MCU that could offload data frame processing in Wi-Fi host driver. The Bluetooth subsystem contains the Bluetooth radio, baseband, link controller. It also uses the 32-bit RISC MCU for the Bluetooth protocols. This compact module is a total solution for a combination of Wi-Fi and Bluetooth V5.0 technologies. The module is specifically developed for all portable devices.


Integrate high efficiency power management unit with single 3.3V power supply input. 

SDIO device fully compliant to SDIO 3.0 specification. 

Programmable and multiplexed GPIO pins. 

IEEE 802.11 a/b/g/n/ac compliant. 

Support 20MHz, 40MHz, 80Mhz bandwidth in 2.4GHz band 5GHz band. 

Dual-band 2T2R mode, data rate up to 450Mbps with SDIO 3.0. 

Support MU-MIMO RX and DBDC (dual band dual concurrent). 

Support STBC, LDPC, TX Beamformer and RX Beamformee. 

Greenfield, mixed mode, legacy modes support. 

IEEE 802.11 d/e/h/i/j/k/mc/r/v/w support. 

Security support for WFA WPA/WPA2 personal, WPS 2.0, WAPI. 

QoS support of WFA WMM, WMM PS. 

Support Bluetooth 5.0.


OTT/IPTV/DVB/Set-top Box, Tablet PC, Advertising Machine,Intelligent TV, IPC/NVR, Industrial Control Equipment,Car Recorder,Intelligent Doorbell, Intelligent Projector, Virtual Reality, VR/AR, Wireless Storage, Printer, POS Machine, Electronic Scale,Vehicle Front/Rear End, Drone, Robot, HDMI Transmitter,Smart Gateway, Education,Toys, Lighting Lamps, Intelligent Street Light, Intelligent Home Appliances/Home Appliances Instrumentation (Water, Electricity, Gas), Smart City and other Consumer Electronic Products.

 Block Diagram 

5261B-SR module


Model No.


Main Chipset



Wi-Fi: SDIO V3.0


Wi-Fi Standard


Data Rate




RF Antenna

External Antenna

OS Supported


Operating Frequency

2.4G:2.400GHz~2.497GHz(2.4G ISM Band)

5.8G:4.900GHz~5.845GHz(5.0G ISM Band)

Operating Voltage



L15.0 * W13.0 * T1.65mm

RF Chain


Operating Temperature

-10°C to 70°C

Storage Temperature

-40°C to 125°C

 Ordering Information 

Part No.



MT7661RSN, a/b/g/n/ac, WiFi+BT5.0, 2T2R, SDIO,Three antenna.


 14th Floor, Block B, Phoenix Zhigu, No.50 Tiezai Road, Gongle Community, Xixiang Street,
Baoan District, Shenzhen, China 518000

 +86-755-2332 9312

FN-LINK TECHNOLOGY LIMITED is mainly engaged in the R&D, production and sales of wireless communication modules and system solutions, peripheral equipment, and audio-visual equipment

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