WBR3T Module Datasheet

Last Updated on : 2024-03-29 10:04:11download

WBR3T is a low-power embedded Wi-Fi+Bluetooth module that Tuya has developed. It consists of a highly integrated wireless RF chip (W701DH-VA1-CG), a few peripherals, an embedded Wi-Fi network protocol stack, the Bluetooth 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 Wi-Fi MAC and TCP/IP protocols. You can develop embedded Wi-Fi products as required.

The functional block diagram of WBR3T is shown as below:

WBR3T Module Datasheet


  • Embedded low-power 32-bit CPU, which can also function as an application processor
  • The maximum clock rate: 200 MHz
  • Operating voltage: 3.3±0.3V
  • Peripherals: 8 GPIOs, 1 UART, and 1 ADC
  • Wi-Fi 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 WEP/WPA/WPA2/WPA2 PSK (AES) WPA3 security mode
    • 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
    • Operating temperature: -40 to 105℃
  • Bluetooth connectivity
    • Support Bluetooth (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 Wi-Fi.
    • Operating temperature: -40 to 105℃


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

Module interfaces

Dimensions and footprint

WBR3T has two lines of pins with a pin spacing of 2±0.1 mm.

The WBR3T dimensions are 16±0.35 mm mm (W)×24±0.35 mm mm (L) ×3±0.15 mm mm (H).

Diagram of dimensions of WBR3T

WBR3T Module Datasheet
WBR3T Module Datasheet

Note: The general outline tolerance is ±0.35 mm, the tolerance of the part 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 number Symbol I/O type Function
1 RST I/O Reset pin
2 ADC AI ADC(1), which corresponds to PB 3 of IC
3 EN I Enabling pin, which needs to be connected to the voltage of 3.3 V when normally used and corresponds to CHIP_EN of IC
4 PA15 I/O Common IO pin, which corresponds to PA 15 of IC
5 PA13 P Need to support hardware PWM, which corresponds to PA 13 of IC
6 PA12 I/O Need to support hardware PWM, which corresponds to PA 12 of IC
7 PA26 I/O Need to support hardware PWM, which corresponds to PA 26 of IC
8 VCC P Power supply pin (3.3 V)
9 GND P Power supply reference ground
10 PA25 O Common IO pin, which corresponds to PA 25 of IC
11 LOG_TX O UART0_TXD (used to display the internal information of the module), which corresponds to UART_TXD of IC
12 PB20 I/O A common IO pin, which corresponds to PB 20 of IC
13 PB21 I/O Need to support hardware PWM and correspond to PB 21 of IC
14 PA28 I/O Need to support hardware PWM and correspond to PA 28 of IC
15 RXD/PB2 I/O UART0_RXD(2), which corresponds to PB 2 of IC
16 TXD/PB1 I/O UART0_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 Wi-Fi network configuration.

  • 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.
  • 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 number Symbol I/O type Function
- TEST I Be used to the production test of the module

Note: Test pins are not recommended.

Electrical parameters

Absolute electrical parameters

Parameter Description Minimum value Maximum value Unit
Ts Storage temperature -20 105
VBAT Power supply voltage 3.0 3.6 V
ESD voltage (human body model) TAMB-25℃ - 2 KV
ESD voltage (machine model) TAMB-25℃ - 0.5 KV

Normal working conditions

Parameter Description Minimum value Typical value Maximum value Unit
Ta Operating temperature -20 - 105
VBAT Power supply voltage 3.0 3.3 3.6 V
VIL IO low-level input -0.3 - VCC*0.25 V
VIH IO high-level input VCC*0.75 - VCC V
VOL IO low-level output - - VCC*0.1 V
VOH IO high-level output VCC*0.8 - VCC V
Imax IO drive current - - 12 mA

TX and RX power consumption

Transmission and receiving at 2.4G

Working status Mode Rate Transmit Power/Receive Typical value Unit
Transmit 11b 11 Mbps +18 dBm 250 mA
Transmit 11g 54 Mbps +17 dBm 180 mA
Transmit 11n-HT20 MCS 7 +16 dBm 170 mA
Transmit 11n-HT40 MCS 7 +16 dBm 150 mA
Receive 11b 11 Mbps Constantly receive 70 mA
Receive 11g 54 Mbps Constantly receive 72 mA
Receive 11n-HT20 MCS 7 Constantly receive 70 80
Receive 11n-HT40 MCS 7 Constantly receive 73 80

Transmission and receiving at 5G

Working status Mode Rate Transmit Power/Receive Typical value Unit
Transmit 11a 54 Mbps +15 dBm 300 mA
Transmit 11n-HT20 MCS 7 +15 dBm 230 mA
Transmit 11n-HT40 MCS 7 +14 dBm 220 mA
Receive 11a 54 Mbps Constantly receive 71 mA
Receive 11n-HT20 MCS 7 Constantly receive 72 mA
Receive 11n-HT40 MCS 7 Constantly receive 76 mA

Operating current

Working mode Working status, Ta = 25℃ Average value Maximum value (Typical value) Unit
Quick connection network state The module is in the fast network connection state and the Wi-Fi indicator always flashes 57 184 mA
Hotspot network configuration state The module is in the hotspot network configuration state and the Wi-Fi indicator flashes slowly 203 392 mA
Network connection operation state The module is connected to the network and the Wi-Fi indicator is always on 55 98 mA
Disconnected The module is disconnected and the Wi-Fi indicator is dark 53 59 mA

RF parameters

Basic RF features

Parameter Description
Working frequency 2.412 to 2.484 GHz; 5.180 to 5.885 GHz
Wi-Fi standard IEEE 802.11 a/b/g/n (Channels 1 to 14; channels 36 to 177)
Data transmission rate 11b: 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 type PCB 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

Parameter Minimum value Typical value Maximum value Unit
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 - 10 ppm

5G-TX Performance

Parameter Minimum value Typical value Maximum value Unit
Average RF output power, 802.11a OFDM Mode 54M - 15 - dBm
Average RF output power, 802.11n HT20 Mode MCS7 - 13 - dBm
Average RF output power, 802.11n HT40 Mode MCS7 - 13 - dBm
Frequency error -10 - 10 ppm

RX performance

RX sensitivity

Parameter Minimum value Typical value Maximum value Unit
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 type

WBR3T uses only an onboard PCB antenna.

Antenna interference reduction

To ensure optimal Wi-Fi performance when the Wi-Fi module uses an onboard PCB antenna, it is recommended that the antenna be at least 15 mm away from other metal parts.

To ensure 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 ±0.35 mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication.

Schematic diagram of footprint

WBR3T Module Datasheet

Diagram of PCB footprint-Pin header

WBR3T can be mounted by the SMT.

Diagram of PCB footprint-SMT

WBR3T Module Datasheet

Production instructions

  1. The Tuya SMT module should be mounted by the SMT device. After being unpacked, it should be soldered within 24 hours. Otherwise, it should be put into the drying cupboard where the RH is not greater than 10%; or it needs to be packaged under vacuum again and the exposure time needs to be recorded (the total exposure time cannot exceed 168 hours).
    • SMT devices:
      • Mounter
      • SPI
      • Reflow soldering machine
      • Thermal profiler
      • Automated optical inspection (AOI) equipment
    • Baking devices:
      • Cabinet oven
      • Anti-electrostatic and heat-resistant trays
      • Anti-electrostatic and heat-resistant gloves
  2. Storage conditions for a delivered module:
    • The moisture-proof bag must be placed in an environment where the temperature is below 40°C and the relative humidity is lower than 90%.

    • The shelf life of a dry-packaged product is 12 months from the date when the product is packaged and sealed.

    • There is a humidity indicator card (HIC) in the packaging bag.

      WBR3T Module Datasheet

  3. The module needs to be baked in the following cases:
    • The packaging bag is damaged before unpacking.
    • There is no HIC in the packaging bag.
    • After unpacking, circles of 10% and above on the HIC become pink.
    • The total exposure time has lasted for over 168 hours since unpacking.
    • More than 12 months has passed since the sealing of the bag.
  4. Baking settings:
    • Temperature: 40°C and ≤ 5% RH for reel package and 125°C and ≤5% RH for tray package (please use the heat-resistant tray rather than plastic container)
    • Time: 168 hours for reel package and 12 hours for tray package
    • Alarm temperature: 50°C for reel package and 135°C for tray package
    • Production-ready temperature after natural cooling: < 36°C
    • Re-baking situation: If a module remains unused for over 168 hours after being baked, it needs to be baked again.
    • If a batch of modules is not baked within 168 hours, do not use the wave soldering to solder them. Because these modules are Level-3 moisture-sensitive devices, they are very likely to get damp when exposed beyond the allowable time. In this case, if they are soldered at high temperatures, it may result in device failure or poor soldering.
  5. In the whole production process, take electrostatic discharge (ESD) protective measures.
  6. To guarantee the passing rate, it is recommended that you use the SPI and AOI to monitor the quality of solder paste printing and mounting.

Recommended oven temperature curve

Set oven temperatures according to the following temperature curve of reflow soldering. The peak temperature is 245°C.

WBR3T Module Datasheet

  • A: Temperature axis

  • B: Time axis

  • C: Liquidus temperature: 217 to 220°C

  • D: Ramp-up slope: 1 to 3°C/s

  • E: Duration of constant temperature: 60 to 120s; the range of constant temperature: 150 to 200°C

  • F: Duration above the liquidus: 50 to 70s

  • G: Peak temperature: 235 to 245°C

  • H: Ramp-down slope: 1 to 4°C/s

    Note: The above curve is just an example of the solder paste SAC305. For more details about other solder pastes, please refer to Recommended oven temperature curve in the solder paste specifications.

Storage conditions

WBR3T Module Datasheet

MOQ and packaging information

Product model MOQ(pcs) Packing method Number of modules per reel Number of reels per carton
WBR3T 4000 Tape reel 1000 4

Appendix: Statement

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

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 device has been tested and found to comply with the limits for a Class B digital device, according to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This device generates, uses, and can radiate radio frequency energy and, if not installed and used following 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 device does cause harmful interference to radio or television reception, which can be determined by turning the device 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 device and receiver.
  • Connect the device 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 device complies with FCC radiation exposure limits set forth for an uncontrolled rolled environment. This device should be installed and operated with a minimum distance of 20cm between the radiator and your body.

Important Note

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

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 with 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/warnings 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 has got an FCC ID: 2ANDL-WBR3T. The end product must be labelled 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:

The antenna must be installed such that 20cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna.

As long as the 2 conditions above are met, further transmitter tests 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 https://www.tuya.com.

WBR3T Module Datasheet

This product must not be disposed of as normal household waste, in accordance with the 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 20cm to the human body.