WBR3T Module Datasheet

Last Updated on : 2020-08-12 11:16:04download

Product Overview

WBR3T is a low-power embedded WiFi+BLE module that Tuya has developed. It consists of a highly integrated wireless RF chip (RTL8720DN), a few peripherals, an embedded WiFi network protocol stack, the BT network protocol, and varied library functions. WBR3T has an embedded low-power 32-bit CPU, 512-KB static random-access memory (SRAM), 4-MB flash memory, and rich peripherals. WBR3T is an RTOS platform that integrates all function libraries of the WiFi MAC and TCP/IP protocols. You can develop embedded WiFi products as required. The functional block diagram of WBR3T is shown as belows: WBR3T Module Datasheet


  • Embedded low-power 32-bit CPU, which can also function as an application processor
  • The maxium clock rate: 200 MHz
  • Working voltage: 3.3±0.3V
  • Peripherals: 8 GPIOs, 1 universal asynchronous receiver/transmitter (UART), and 1 analog to digital converter (ADC)
  • WiFi connectivity
    • 802.11 a/b/g/n 1x1, 2.4 G&5 G
    • Channels 1 to 14 at 2.4 Ghz; channels 36 to 177 at 5 Ghz
    • Support WPA and WPA 2 security modes
    • Up to +17 dBm output power in 802.11b mode; Up to +15 dBm output power in 802.11a mode
    • Support STA/AP/STA+AP working mode
    • Support SmartConfig and AP network configuration manners for Android and iOS devices
    • Onboard PCB antenna with a gain of 0 dBi at 2.4G; onboard PCB antenna with a gain of 0.7 dBi at 5.0 G
    • Working temperature: -20 to 105℃
  • BLE connectivity
    • Support BLE (V5.0) and the rates of 1 M and 2 M
    • Up to +9 dbm output power
    • PCB antenna with a gain of 0 dBi at 2.4 G, which is shared with WiFi.
    • Working temperature: -20 to 105℃


  • Intelligent building
  • Smart household and home appliances
  • Smart socket and light
  • Industrial wireless control
  • Baby monitor
  • Network camera
  • Intelligent bus

Change History

Serial NumberUpdate DateUpdated ContentVersion after Update
17/13/2020This is the first release.V1.0.0

Information about Labels of WBR3T

  • P/N: Module Number
  • Model: Product material code: WBR3T
  • S/N: Production serial number
  • CE: CE certification logo
  • RoHS: RoHS certification logo

Module Interfaces

Dimensions and Footprint

WBR3T has two rows of pins with a 2±0.1 mm pin spacing. The WBR3T dimensions are 16 mm (W)×24 mm (L) ×3 mm (H).

Diagram of dimensions of WBR3T

WBR3T Module DatasheetWBR3T Module Datasheet

Note: The general shape tolerance is 0.3 mm, the position tolerance related to the plug-in assembly is reduced to 0.1 mm, and the tolerance of the 1-mm-thick plate is 0.1 mm.

Pin Definition

WBR3T Module Datasheet

Pin NumberSymbolI/O TypeFunction
1RSTI/OReset pin
2ADCAIADC(1), which corresponds to PB 3 of IC
3ENIEnabling pin, which needs to be connected to the voltage of 3.3 V when normally used, and corresponds to CHIP_EN of IC
4PA15I/OCommon IO pin, which corresponds to PA 15 of IC
5PA13PNeed to support hardware PWM, which corresponds to PA 13 of IC
6PA12I/ONeed to support hardware PWM, which corresponds to PA 12 of IC
7PA26I/ONeed to support hardware PWM, which corresponds to PA 26 of IC
8VCCPPower supply pin (3.3 V)
9GNDPPower supply reference ground
10PA25OCommon IO pin, which corresponds to PA 25 of IC
11LOG_TXOUART0_TXD (used to display the internal information of the module), which corresponds to UART_TXD of IC
12PB20I/OA common IO pin, which corresponds to PB 20 of IC
13PB21I/ONeed to support hardware PWM and correspond to PB 21 of IC
14PA28I/ONeed to support hardware PWM and correspond to PA 28 of IC
15RXD/PB2I/OUART0_RXD(2), which corresponds to PB 2 of IC
16TXD/PB1I/OUART0_TXD(2), which corresponds to PB 1 of IC

Note: P indicates power supply pins, I/O indicates input/output pins, and AI indicates analog input pins. RST is only a reset pin of a module and cannot be used for clearing information about WiFi network configuration. (1): The pin can only be used as an ADC interface but cannot be used as a common IO interface. Once not used, it needs to be pulled up. As an ADC input interface, the input voltage range is 0 to 1.0 V. (2): UART0 is a user-side serial interface pin. When a module is enabled, there is information output from the user-side serial interface pin, which can be neglected.

Definitions on Test points

Pin NumberSymbolI/O TypeFunction
-TESTIBe used to the production test of the module

Note: Test pins are not recommended.

Electrical Parameters

Absolute Electrical Parameters

ParameterDescriptionMinimum valueMaximum ValueUnit
TsStorage temperature-20105
VBATPower supply voltage3.03.6V
Static electricity discharge voltage (human body model)TAMB-25℃-2KV
Static electricity discharge voltage (machine model)TAMB-25℃-0.5KV

Normal Working Conditions

ParameterDescriptionMinimum valueTypical ValueMaximum ValueUnit
TaWorking temperature-20-105
VBATPower supply voltage3.03.33.6V
VILIO low-level input-0.3-VCC*0.25V
VIHIO high-level inputVCC*0.75-VCCV
VOLIO low-level output--VCC*0.1V
VOHIO high-level outputVCC*0.8-VCCV
ImaxIO drive current--12mA

TX and RX Power Consumption:

Transmission and Receiving at 2.4G

Working StatusModeRateTransmit Power/ReceiveTypical ValueUnit
Transmit11b11 Mbps+18 dBm250mA
Transmit11g54 Mbps+17 dBm180mA
Transmit11n-HT20MCS 7+16 dBm170mA
Transmit11n-HT40MCS 7+16 dBm150mA
Receive11b11 MbpsConstantly receive70mA
Receive11g54 MbpsConstantly receive72mA
Receive11n-HT20MCS 7Constantly receive7080mA
Receive11n-HT40MCS 7Constantly receive7380mA

Transmission and Receiving at 5G

Working StatusModeRateTransmit Power/ReceiveTypical ValueUnit
Transmit11a54 Mbps+15 dBm300mA
Transmit11n-HT20MCS 7+15 dBm230mA
Transmit11n-HT40MCS 7+14 dBm220mA
Receive11a54 MbpsConstantly receive71mA
Receive11n-HT20MCS 7Constantly receive7280mA
Receive11n-HT40MCS 7Constantly receive7680mA

Working Current

Working ModeWorking Status, Ta = 25℃Average ValueMaximum Value (Typical Value)Unit
Quick connection network stateThe module is in the fast network connection state and the WiFi indicator always flashes57184mA
Hotspot network configuration stateThe module is in the hotspot network configuration state and the WiFi indicator flashes slowly203392mA
Network connection operation stateThe module is connected to the network and the WiFi indicator is always on5598mA
Disconnected stateThe module is disconnected and the WiFi indicator is dark5359mA

RF Parameters

Basic RF Features

Working frequency2.412 to 2.484 GHz; 5.180 to 5.885 GHz
WiFi standardIEEE 802.11 a/b/g/n (Channels 1 to 14; channels 36 to 177)
Data transmission rate11b: 1, 2, 5.5, 11 (Mbps); 11 a/g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps); 11n: HT20 MCS 0 to 7; HT40 MCS 0 to 7
Antenna typePCB antenna with a gain of 0 dBi at 2.4 G; PCB antenna with a gain of 0.7 dBi at 5 G

TX Performance

2.4 G TX Performance

ParameterMinimum ValueTypical ValueMaximum ValueUnit
Average RF output power, 802.11b CCK Mode 11M-17-dBm
Average RF output power, 802.11g OFDM Mode 54M-16-dBm
Average RF output power, 802.11n HT20 Mode MCS7-15-dBm
Average RF output power, 802.11n HT40 Mode MCS7-14-dBm
Frequency error-10-10ppm

5G-TX Performance

ParameterMinimum ValueTypical ValueMaximum ValueUnit
Average RF output power, 802.11a OFDM Mode 54M-15-dBm
Average RF output power, 802.11n HT20 Mode MCS7-14-dBm
Average RF output power, 802.11n HT40 Mode MCS7-13-dBm
Frequency error-10-10ppm

RX Performance

RX sensitivity

ParameterMinimum ValueTypical ValueMaximum ValueUnit
PER<8%, RX sensitivity, 802.11b DSSS Mode 11M--91-dBm
PER<10%, RX sensitivity, 802.11a/g OFDM Mode 54M--75-dBm
PER<10%, RX sensitivity, 802.11n OFDM Mode HT20-MCS7--72-dBm

Antenna Information

Antenna Type

WB8P uses only an onboard PCB antenna.

Antenna Interference Reduction

To ensure optimal WiFi performance when the WiFi module uses an onboard PCB antenna, it is recommended that the antenna be at least 15 mm away from other metal parts. To ensure the antenna performance, the PCB should not be routed or clad with copper in the antenna area. The main points of the layout: 1. Make sure that there is no substrate medium directly below or above the printed antenna. 2. Make sure that the area around the printed antenna is far away from the metal copper skin, so as to ensure the radiation effect of the antenna to the greatest extent. WBR3T Module Datasheet

For the antenna area of the PCB of the module, refer to Diagram of Mechanical Dimensions.

Treatment of GPIO Pins

A few pins (PA 12, PA 13, PA 15, PA 25, PA 28, and PA 26) of the module will have instantaneous high-level pulses before the chip fully works, and everything will be normal after the chip works. For these pins, if they are directly used as driving light sources or relays, in order to avoid the effect of burrs at the moment of powering on, refer to the following processing methods: Pull down a 1-K resistor at an output port of a pin, and then connect a diode in series. At this time, the voltage of a GPIO will drop to about 2.7V after passing through the diode. The red box represents the original drive tube on the customer's baseboard. A diode D1 and pull-down 1-K resistor need to be added. If a lamp is directly driven, pull down a 10-K resistor on the grid of the positive Mos. If a lamp is not directly driven and a PWM signal will not be sent until the module is officially launched, there is no need to add a pull-down resistor and diode. If a relay is driven, you can change the diode to a resistor of 0 ohm according to the actual situation. WBR3T Module Datasheet

Packaging Information and Production Instructions

Mechanical Dimensions

The WBR3T dimensions are 16 mm (W)×24 mm (L) ×2.8 mm (H). WBR3T Module Datasheet

Side View

WBR3T Module Datasheet

Note: The default dimensional tolerance is 0.3 mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication.

The Schematic Diagram of Packaging

WBR3T Module Datasheet

The Diagram of PCB Packaging-Pin

WBR3T can use SMT.

The Diagram of PCB Packaging-SMT

WBR3T Module Datasheet

Production Instructions

  1. Tuya's stamp hole package module must be mounted by SMT machine within 24 hours after unpacking and programming of firmware. Otherwise, it must be packaged again under vacuum. The module must be baked before mounting. A. SMT equipment a) Reflow soldering machine b) Automated optical inspection (AOI) equipment c) Nozzle with a 6 mm to 8 mm diameter B. Baking equipment a) Cabinet oven b) Anti-static heat-resistant trays c) Anti-static heat-resistant gloves
  2. Storage conditions for a delivered module are as follows: A. The moisture-proof bag must be placed in an environment where the temperature is below 30℃ and the relative humidity is lower than 70%. B. The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed. C. The package contains a humidity indicator card (HIC). WBR3T Module Datasheet

  3. Bake a module based on HIC status as follows when you unpack the module package: A. If the 30%, 40%, and 50% circles are blue, bake the module for 2 consecutive hours. B. If the 30% circle is pink, bake the module for 4 consecutive hours. C. If the 30% and 40% circles are pink, bake the module for 6 consecutive hours. D. If the 30%, 40%, and 50% circles are pink, bake the module for 12 consecutive hours.

  4. Baking settings: A. Baking temperature: 125℃ B. Alarm temperature: 130℃ C. SMT ready temperature after natural cooling: < 36℃ D. The number of drying times: 1 E. Rebaking condition: The module is not soldered within 12 hours after baking
  5. Do not use SMT to process modules that have been unpacked for more than 3 months, because electroless nickel/immersion gold (ENIG) is used for PCBs and they are seriously oxidized after more than 3 months. SMT is very likely to cause pseudo and missing soldering. Tuya is not liable for such problems and consequences.
  6. Before SMT, take electrostatic discharge (ESD) protective measures.
  7. To reduce the reflow defect rate, draw 10% of the products for visual inspection and AOI before the first SMT mounting to determine proper methods for controlling the oven temperature and attaching and placing components. Draw 5 to 10 modules from subsequent batches each hour for visual inspection and AOI.

Recommended Oven Temperature Curve

Perform SMT based on the following reflow oven temperature curve. The highest temperature is 245℃. The reflow temperature curve is shown as belows:

WBR3T Module Datasheet

Storage conditions

WBR3T Module Datasheet

MOQ and Packaging Information

Product NumberMOQ(pcs)Shipping packaging methodThe number of modules per reel (pcs)The number of reels per carton (reel)
WBR3T4000Tape reel10004


FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled rolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body.

Important Note

This radio module must not installed to co-locate and operating simultaneously with other radios in host system except in accordance with FCC multi-transmitter product procedures. Additional testing and equipment authorization may be required to operating simultaneously with other radio.

The availability of some specific channels and/or operational frequency bands are country dependent and are firmware programmed at the factory to match the intended destination. The firmware setting is not accessible by the end user.

The host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. The final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed.

The end user manual shall include all required regulatory information/warning as shown in this manual, including: This product must be installed and operated with a minimum distance of 20 cm between the radiator and user body.

This device have got a FCC ID: 2ANDL-WBR3T. The final end product must be labeled in a visible area with the following: "Contains Transmitter Module FCC ID: 2ANDL-WBR3T".

This device is intended only for OEM integrators under the following conditions: 1) The antenna must be installed such that 20cm is maintained between the antenna and users, and 2) The transmitter module may not be co-located with any other transmitter or antenna.

As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.

Declaration of Conformity European notice

WBR3T Module Datasheet

Hereby, Hangzhou Tuya Information Technology Co., Ltd declares that this module product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EU, 2011/65/EU. A copy of the Declaration of conformity can be found at

WBR3T Module Datasheet

This product must not be disposed of as normal household waste, in accordance with EU directive for waste electrical and electronic equipment (WEEE-2012/19/EU). Instead, it should be disposed of by returning it to the point of sale, or to a municipal recycling collection point.

The device could be used with a separation distance of 20 cm to the human body.

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