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6221A-SRC Wi-Fi Module

RTL8821CS 5G Wi-Fi
SDIO3.0/Uart 1T1R
BT4.2/ BLE4.2
12.0 X 12.0mm
Contact us for HDK, SDK and EVB
Pre-certification available: CE, SRRC
  • 2.4G+5G 

  • BT4.2 and below 

  • Realtek 

  • 1T1R 

  • Select 

  • SDIO Interface 

Product Name

RTL8821CS Wi-Fi Module 6221A-SRC


5G Wi-Fi



BT4.2/ BLE4.2

12.0 X 12.0mm

Details Information


Fn-Link Technology would like to announce a low-cost and low-power consumption module which has all of the Wi-Fi functionalities. It is a highly-integrated IEEE 802.11 a/b/g/n/ac MAC/Baseband/RF WLAN single chip. For Wireless LAN(WLAN)operation. The integrated module provides SDIO interface for Wi-Fi . The module provides simple legacy and 20MHz/40MHz/80MHz co-existence mechanisms to ensure backward and network compatibility.

The wireless module complies with IEEE 802.11 a/b/g/n/ac standard and it can achieve up to a speed of 433.3Mbps with single stream in 802.11ac draft to connect to the wireless LAN. The integrated module provides SDIO interface for Wi-Fi, UART / PCM interface for Bluetooth. This compact module is a total solution for a combination of Wi-Fi + BT technologies. 

The module is specifically developed for Smart phones and Portable devices.


Highly integrated wireless local area network(WLAN) system-on-chip (SOC) for 5 GHZ 802.11ac, or 2.4G/5G 802.11n WLAN applications.

Supports 20/40MHz at 2.4GHz and supports 20/40/80MHz at 5GHz.

Supports low power SDIO3.0 interface for WLAN and UART/PCM interface forBluetooth.

Supports Bluetooth V4.2+HS, BLE and be backwards compatible with Bluetooth 1.2, 2.X+ enhance data rate.

Supports WLAN-Bluetooth coexistence.

Supports Bluetooth for class1 and class2 power level transmissions without requiring an external PA.

BT host digital interface:

- HCI UART (up to 4 Mbps)

- PCM for audio data


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 

6221A-SRC module


Model No. 6221A-SRC Main Chipset RTL8821CS

Wi-Fi: SDIO V3.0/2.0/1.1


WiFi Standard IEEE802.11a/b/g/n/ac+BLE4.2
Data Rate 433Mbps Certification RoHS,REACH
RF Antenna External Antenna OS Supported Linux/Android/Windows

Operating Frequency

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

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

Operating Voltage


Dimension L12 * W12 * T2.0 mm RF Chain 1T1R
Operating Temperature 0°C to 70°C Storage Temperature -40°C to 85°C

 Ordering Information 

Part No. Description
FG6221ASRC-00 RTL8821CS, a/b/g/n/ac, Wi-Fi+BLE4.2, 1T1R, 12X12mm, SDIO +Uart, PCB V1.0
FG6221ASRC-0L RTL8821CS, a/b/g/n/ac, Wi-Fi+BLE4.2, 1T1R, 12X12mm, SDIO +Uart, PCB V1.0 (no C33)


 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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