WR3LE Module Datasheet

Last Updated on : 2022-08-09 03:01:22download

WR3LE is a low-power embedded Wi-Fi module that Tuya has developed. It consists of a highly integrated wireless RF chip (RTL8710BX) and an external flash chip, with an embedded Wi-Fi network protocol stack and varied library functions.


With the maximum CPU clock rate of 62.5MHz, WR3LE also contains a low-power ARM CM4F, a WLAN MAC, a 1T1R WLAN module, a 256-KB SRAM, 2-MB flash memory, and extensive peripherals.

WR3LE 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.


  • Embedded low-power 32-bit CPU, which can also function as an application processor
  • Clock rate: 62.5 MHz
  • Operating voltage: 3.0 to 3.6 V
  • Peripherals: 7 GPIOs, 2 universal asynchronous receiver/transmitters (UART) and 1 analog to digital converter (ADC)
  • Wi-Fi connectivity
    • 802.11 B/G/N20/N40
    • Channels 1 to 14@2.4 GHz (CH1 to 11 for US/CA and CH1 to 13 for EU/CN)
    • Support WEP/WPA/WPA2/WPA2 PSK (AES) security modes
    • +20 dBm output power in 802.11b mode
    • Support SmartConfig functions for Android and iOS devices
    • Onboard PCB antenna
    • Passed CE and FCC certification
    • Operating temperature: -20 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

WR3LE has two rows of pins with a 2mm pin spacing. Each row has 8 pins.

The WR3LE dimensions are 16±0.35 mm (W)×24±0.35 mm (L) ×3.4±0.15 mm (H). The dimensions of WR3LE are as follows:

WR3LE Module Datasheet

Pin definition

Definitions on interface pins are shown as below:

Pin number Symbol IType Function
1 NC / Pulled up and not connected, to be compatible with other modules
2 ADC AI ADC port, the maximum input voltage is 5V
3 CHIP_EN I/O When software disables the function, connection by a user fails
4 GPIOA_29 I/O UART_Log_RXD (used to display the internal information of the module), which can be configured as a universal GPIO. The module has been pulled up and cannot be used for triggering the high level
5 GPIOA_14 I/O GPIOA_14, hardware PWM, IC Pin 13
6 GPIOA_15 I/O GPIOA_15, hardware PWM, IC Pin 14
7 GPIOA_22 I/O GPIOA_22, hardware PWM, IC Pin 31
8 VCC P Power supply pin (3.3 V)
9 GND P Power supply reference ground
10 GPIOA_0 I/O GPIOA_0, which cannot be pulled high when powered on, and which can be configured with any level after being enabled, hardware PWM, IC Pin 16
11 GPIOA_30 I/O UART_Log_TXD (used to display the internal information of the module), which can be configured as a universal GPIO
12 GPIOA_19 I/O GPIOA_19, a universal IO port, IC Pin 30
13 GPIOA_5 I/O GPIOA_5, hardware PWM, IC Pin 28
14 GPIOA_12 I/O GPIOA_12, hardware PWM, IC Pin 17
15 RXD I/O UART0_RXD (user-side serial interface)
16 TXD I/O UART0_TXD (user-side serial interface)

Note: P indicates power supply pins, I/O indicates input/output pins, and AI indicates analog input pins.

Electrical parameters

Absolute electrical parameters

Parameter Description Minimum Value Maximum Value Unit
Ts Storage temperature -40 125
VDD Power supply voltage -0.3 3.6 V
Static electricity discharge voltage (human body model) TAMB-25℃ - 2 KV
Static electricity discharge voltage (machine model) TAMB-25℃ - 0.5 KV

Working conditions

Parameter Description Minimum Value Typical Value Maximum Value Unit
Ta Operating temperature -20 - 105
VDD Operating voltage 3.0 - 3.6 V
VIL IO low-level input -0.3 - VDD*0.25 V
VIH IO high-level input VDD*0.75 - 3.6 V
VOL IO low-level output - - VDD*0.1 V
VOH IO high-level output VDD*0.8 - VDD V
Imax IO drive current - - 16 mA
Cpad Input pin capacitance - 2 - pF

RF power consumption

TX power consumption:

Working status Mode Rate Transmit power/Receive Average value Peak value (Typical value) Unit
Transmit 11 b 11 Mbps +17 dBm 287 367 mA
Transmit 11 b 11 Mbps +18 dBm 295 382 mA
Transmit 11 g 54 Mbps +15 dBm 255 406 mA
Transmit 11 g 54 Mbps +17.5 dBm 267 428 mA
Transmit 11n-HT20 MCS 7 13 dBm 244 395 mA
Transmit 11n-HT20 MCS 7 16.5 dBm 257 422 mA
Transmit 11n-HT40 MCS 7 13 dBm 220 393 mA
Transmit 11n-HT40 MCS 7 16.5 dBm 230 420 mA

RX power consumption:

Symbol Mode Average Value Unit
IRF CPU Sleep 90 mA
IRF CPU Active 120 mA

Working power consumption

WR3LE operating current

Working Mode Working Status, Ta = 25°C Average Value Peak Value (Typical Value) Unit
Quick connection network state The module is in the fast network connection state and the Wi-Fi indicator always flashes 115 376 mA
Hotspot network configuration state The module is in the hotspot network configuration state and the Wi-Fi indicator always flashes slowly 60 386 mA
Network connection operation state The module is connected to the network and the Wi-Fi indicator is always on 105 389 mA
Disconnected state The module is disconnected and the Wi-Fi indicator is dark 45 381 mA

RF parameters

Basic RF features

Parameter Description
Frequency range 2.400 to 2.4835 GHz
Wi-Fi standard IEEE 802.11b/g/n (channels 1 to 14)
Data transmission rate 11b: 1, 2, 5.5, 11 (Mbps)
Data transmission rate 11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps)
Data transmission rate 11n: HT20 MCS 0 to 7
Data transmission rate 11n: HT40 MCS 0 to 7
Antenna type Onboard PCB antenna with a gain of 2.5 dBi

TX performance

TX performance

Parameter Minimum Value Typical Value Maximum Value Unit
Average RF output power, 802.11b CCK Mode 1 M - 17.5 - dBm
Average RF output power, 802.11g OFDM Mode 54 M - 14.5 - dBm
Average RF output power, 802.11n OFDM Mode MCS 7 - 13.5 - dBm
Peak RF output power, 802.11b CCK Mode 1 M - 19 - dBm
Peak RF output power, 802.11g OFDM Mode 6 M - 20 - dBm
Peak RF output power, 802.11n OFDM Mode MCS 0 - 20 - dBm
Frequency error -20 - 20 ppm
EVM@802.11b CCK 11 Mbps Mode 17.5 dBm - -10 dB
EVM@802.11g OFDM 54 Mbps Mode 15.0 dBm - -29 dB
EVM@802.11n OFDM MCS7 Mode 14.0 dBm - -30 dB

RX performance

RX sensitivity

Parameter Minimum Value Typical Value Maximum Value Unit
PER<8%, RX sensitivity, 802.11b CCK Mode 1 M - -91 - dBm
PER<10%, RX sensitivity, 802.11g OFDM Mode 54M - -75 - dBm
PER<10%, RX sensitivity, 802.11n OFDM Mode MCS7 - -72 - dBm


Antenna type

WR3LE uses only an onboard PCB antenna with a gain of 2.5 dBi.

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.

Packaging information and production instructions

Mechanical dimensions

The mechanical dimensions of the PCB of WR3LE are 16±0.35 mm (W)×24±0.35 mm (L) ×0.8±0.1 mm (H).

The following figure shows the mechanical dimensions of WR3LE.

WR3LE Module Datasheet

Side view

WR3LE 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.

Recommended PCB footprint

The following figure is a schematic diagram of WR3LE which shows the layout of pins.

WR3LE Module Datasheet

WR3LE PCB footprint is shown below:

WR3LE Module Datasheet

Pin header specifications

WR3LE has two models: WBR3L with pin headers and WBR3L without pin headers. Which one is used depends on actual situations. Dimensions and recommended layout of pin headers (unit: mm):

WR3LE Module Datasheet

Production instructions

  1. For the modules that can be packaged with the SMT or in an in-line way, you can select either of them according to the PCB design solutions of customers. If a PCB is designed to be SMT-packaged, package the module with the SMT. If a PCB is designed to be in-line-packaged, package the module in an in-line way. After being unpacked, the module must be soldered within 24 hours. Otherwise, it needs to be put into the drying cupboard where the relative humidity is not greater than 10%; or it needs to be packaged again under vacuum and the exposure time needs to be recorded (the total exposure time cannot exceed 168 hours).
    • (SMT process) SMT devices:
      • Mounter
      • SPI
      • Reflow soldering machine
      • Thermal profiler
      • Automated optical inspection (AOI) equipment
    • (Wave soldering process) Wave soldering devices
      • Wave soldering equipment
      • Wave soldering fixture
      • Constant-temperature soldering iron
      • Tin bar, tin wire and flux
      • Thermal profiler
    • 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 in which 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.

      WR3LE Module Datasheet

  3. The module needs to be baked in the following cases:
    • The packaging bag is damaged before unpacking.
    • There is no humidity indicator card (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

Select a proper soldering manner according to the process. For the SMT process, please refer to the recommended oven temperature curve of reflow soldering. For the wave soldering process, please refer to the recommended oven temperature curve of wave soldering. There are some differences between the set temperatures and the actual temperatures. All the temperatures shown in this module datasheet are obtained through actual measurements.

Manner 1: SMT process (Recommended oven temperature curve of reflow soldering)

Set oven temperatures according to the following curve.

WR3LE 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.

Manner 2: Wave soldering process (Oven temperature curve of wave soldering)

Set oven temperatures according to the following temperature curve of wave soldering. The peak temperature is 260°C±5°C.

WR3LE Module Datasheet
Suggestions on oven temperature curve of wave soldering Suggestions on manual soldering temperature
Preheat temperature 80 to 130 °C Soldering temperature 360±20°C
Preheat time 75 to 100s Soldering time <3s/point
Peak contact time 3 to 5s NA NA
Temperature of tin cylinder 260±5°C NA NA
Ramp-up slope ≤2°C/s NA NA
Ramp-down slope ≤6°C/s NA NA

Storage conditions

WR3LE Module Datasheet

MOQ and packaging information

Product Number MOQ (pcs) Shipping packaging method The number of modules per reel (pcs) The number of reels per carton (reel)
WR3LE 3600 Tape reel 900 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-WR3LE. The end product must be labelled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR3LE”.

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

WR3LE Module Datasheet

Hereby, Hangzhou Tuya Information Technology Co., Ltd declares that this module product complies 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.

WR3LE Module Datasheet

This product must not be disposed of as normal household waste, following 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 a municipal recycling collection point.

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