Chengdu Ebyte Electronic Technology Co.,Ltd
E78-400M22S user manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co,;Ltd
3
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply
（
V
）
0
3.7
Voltage over 5.2V will cause permanent
damage to module
Blocking power
（
dBm
）
-
10
Chances of burn is slim when modules
are used in short distance
Operating temperature
（
℃
）
-40
+85
2.2 Operating parameter
Main parameter
Performance
Remark
Min
Typ.
Max.
Operating voltage
（
V
）
2.5
3.3
3.7
≥3.3 V ensures output power
Communication level
（
V
）
3.3
For 5V TTL, it may be at risk of
burning down
Operating temperature
（
℃
）
-40
-
+85
Industrial design
Operating frequency
（
MHz
）
410
-
493
Support ISM band
Power
consumption
Transmitting current
[mA]
115
Instant power consumption
Receiving current [mA]
24
Turn-off current [μA]
2.5
Software is shut down
Max Tx power
（
dBm
）
20.5
21
21.5
Receiving sensitivity
（
dBm
）
-139
-140
-140
Air data rate is 0.018kbps
Air data rate
（
bps
）
0.018k
-
62.5k
Lora
0.6
-
300
GFSK
Main parameter
Description
Remark
Distance for reference
7000m
Test condition
：
clear and open area, antenna gain: 5dBi
，
antenna height: 2.5m
，
air data rate: 1kbps
Crystal frequency
32MHz
Active temperature complementary crystal vibration
Modulation
LoRa™
Package
SMD
Connector
1.27mm
Stamp hole
Size
14 * 20mm
