Osoyoo SX1278 LoRa Wireless 433mhz Uart Module is a wireless transceiver module based on SX1278 from SEMTECH(can be transmitter and receiver both). It adopts LoRa spread spectrum technology, with this technology the transmitting distance and penetration ability of the module improved more than 1 times compared with traditional FSK.

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RF Parameter

RF Parameter Value Remark
Working frequency 410~441 MHz Default: 433MHz
Transmitting power 10~20 dBm Default: 20dBm(About 100mW)
Receiving sensitivity -146 dBm Air data rate: 0.3kbps
Air data rate 0.3k~19.2kbps Default: 2.4kbps
Test distance 3000 meter In open and clear air, with maximum power, 5dBi antenna gain, height of 2m,

air data rate: 2.4kbps

Hardware Parameter

Hardware Parameter Value Remark
Size 21 * 36 mm Without SMA
Antenna type SMA-K
Communication interface UART Baud rate: 1200~115200, default: 9600
Package  DIP
Buffer 512 bytes buffer Automatically sub-packaging with 58 bytes per package

Electronic parameter

Electronic parameter Min. Typ. Max. Unit Condition
Power supply 2.3 3.3 5.5 V
Communication level 3.0 3.3 3.6 V
Transmitting current 102 110 118 mA 20dBm(100mW)
90 93 96 mA 10dBm(50mW)
Receiving current 12 15 18 mA
Sleep current 3 5 8 μA
Operating temperature -40 20 +85
Operating humidity 10 60 90 %
Storage temperature -40 20 +125

Pin Definition

Pin No. Pin Item Pin Direction Pin Application
1 M0 Input
(weak pull-up)
    Work with M1 & decide the four operating modes. Floating is not allowed, can be ground.
2 M1 Input
(weak pull-up)
    Work with M0 & decide the four operating modes. Floating is not allowed, can be ground.
3 RXD Input     TTL UART inputs, connects to external TXD (MCU, PC) output pin.
Can be configured as open-drain or pull-up input
4 TXD Output     TTL UART outputs, connects to external RXD (MCU, PC) input pin.
Can be configured as open-drain or push-pull output
5 AUX Output     To wake up the external MCU, during the procedure of self-check initialization, the pin

outputs low level. Can be configured as open-drain output or push-pull output (floating

is allowed).

6 VCC Input     Power supply 2.3V-5.2V DC
7 GND Input     Ground
8 Fixing hole     Fixing hole
9 Fixing hole     Fixing hole
10 Fixing hole     Fixing hole



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