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  • SIM800 GSM modules have a inbuilt Bluetooth stack compliant with 3.0+EDR & FM radio support, and the interface is accessible using AT commands.
  • SIM800C GSM module is comes in a very compact size of 17.6*15.7*2.3 mm dimensions compared to SIM900/SIM900 which come in 24*24*3mm package.
  • quad-band: 850/900/1800/1900MHz, dual-band: 900/ 1800MHz
  • Reference link :
GSM/RPRS Package GSM/RPRS -GPS/GNSS Features Other Interface
SIM800F (stop) SMT-24x24 2G
SIM800 <- SIM900 SMT-24x24 <- SMT-24x24
  • SIM800 - GSM/GPRS+BT3
  • SIM900 - GSM/GPRS
  • SIM900 - *SPI
  • SIM800 - *BT3.0 / *Embedded AT /
  • SIM800 - RTC / Serial / USB / SIM1 / ADC, GPIO / PCM / I2C, Keypad, PWM
SIM800A <- SIM900A 68P SMT-24x24 <- SMT-24x24
  • SIM800A - GSM/GPRS+BT3
  • SIM900A - GSM/GPRS
  • Dual band
SIM800C, SIM800C-DS 42P STM-18x16 GSM/GPRS+BT3
  • C - Compact size / *BT3.0
  • C-DS - Compact size / Dual SIM
  • SIM800C - RTC / 2xSerial / USB / SIM1 / ADC
  • SIM800C-DS - RTC / 2xSerial / USB / SIM1 / ADC, GPIO / PCM / I2C, SD, SP2, SIM2
SIM800H <- SIM800L LGA-15.8x17.8 GSM/GPRS+BT3 H - *BT3.0/ *Embedded AT
  • SIM800H - More Flash, Support BT, Fax
  • SIM800H/L - more flash, RTC / Serial / USB / SIM1 / ADC, GPIO / PCM / I2C, Large Keypad, SPK2+MIC2, FM
SIM868 <- SIM968 SMT 24x24 <-SMT 30x30 GSM/GPRS+BT3+GNSS
  • Bluetooth reserved not supported yet
  • Dual-SIM reserved not supported yet
SIM808 <- SIM908 SMT 24x24 <- SMT 30x30

Power compution GPS:

  • 42mA Acqusition
  • 24mA continous tracking
SIM5360E <- SIM5300E, SIM5300EA? STM 30x30 3G, 2.5G, 2G, WCDMA/HSxPA/HSPA+
SIM7100C/E/A 4G LTE - 2G + GNSS
  • A - United States
  • C - China
  • E - Europe
MT3339 GPS
  • Tracking sensitivity: -165dBm, internal LNA
  • Very low continuous tracking power consumption: 3mA
  • GPS/GNSS Module - SIM28 GPS / SIM68 GNSS

Quick Start Guide

  • Attach antenna, this is important for GPRS, not very important for call o SMS message.
  • Make sure sim card is inserted correct
  • And as always, please don’t make an auto-dialer
  • Check power input, for MIC29032, it is 5-20V, MP2315 IC is 5-24V.
  • Supply V-MCU, which is the same power supply voltage to your MCU, normally 5V or 3.3V
  • Pin Definiiton
VCC - board VCC and V-MCU
GND - board GND
TXD - board R
RXD - board T
  • If board us on power key button, it will auto power up, otherwise hold down power key for 3-5 seconds to boot
  • Check power led should be constant on, and Net led blink status will change after network registered.
  • Serial output +CPIN: READY means sim card detect correctly.
  • Please try following AT commands, notice commands end up with \r\n

AT Commands and APP Note

Hardware Design


Schematic of new SIM800 Mini (selling)

SIM800C development Board

SIM808 Development Board

Schematic SIM868

Schematic SIM800 (old)

  • D2 is the Ring led. D1 is Net LED

SIM800 Board Series Details

Net LED:

  • Off  SIM800H/L is not running 
  • 64ms On/800ms Off  SIM800H/L not registered the network 
  • 64ms On/3000ms Off  SIM800H/L registered the network 
  • 64ms On/800ms Off  GPRS communication is established

Ring LED: when module receives the call or a message, this LED will be off or Flash

SIM808 Board Series Details

SIM808 Dev Board

Board specification

SIM808 dev board 05.png
No. Description No. Description
1 sim card insert direction 11 IPX connector
2 battery connector 12 5V power and serial interface
3 sim card protect ic 13 TVS over voltage protection
4 sim card slot 14 bluetooth connector
5 other control pins 15 LDO regulator
6 audio speaker and mic 16 LED status
7 usb connector for upgrading only 17 GPS power supply circuits
8 Titanium capacitor 18 GPS antenna connector
9 TTL 5V/3V3 switch
10 TTL macthing circuits

Simple wiring and serial debugging

Bluetooth Firmware

  • please prepare the USB socket and solder it
  • Install driver and then you can flash the firmware
  • Default firmware support TTS audio to speech, both firmware are provided


File name Model Type Version
File:SIM868 RF Design Application Note V1.00.pdf SIM868 APP-note 1.00
File:SIM800 Series GNSS Application Note V1.00.pdf SIM808 APP-note 1.00
File:SIM800_Series_Bluetooth_Application_Note_V1.01.pdf SIM800 APP-note 1.01
File:SIM800H BT Application Note V1.00.pdf SIM800H APP-note 1.00
File:SIM800 Hardware Design V1.08.pdf SIM800 HD 1.08
SIM800C-Hardware-Design-V1.00 SIM800C HD 1.00
Sim800c-ds-dardware-design.pdf SIM800C-DS HD 1.00
SIM800L_Hardware_Design_V1.00 SIM800L HD 1.00
Sim800h-Hardware-Design-v1-00.pdf SIM800H HD 1.00
File:SIM800 Series AT Command Manual V1.09.pdf SIM800 AT-commands 1.09
File:SIM800 Series AT Command Manual V1.09.pdf SIM808 AT-commands 1.09
SIM868 Brief Specification SIM868 SPEC -
Another SIM868 Brief SIM868 SPEC -
File:SIM868 Reference Design V1.01(160310).pdf SIM868 HD Reference 1.00
SIM868 hardware design guide SIM868 HD 1.00
File:SIM868 Footprint(160310).pdf SIM868 HD-footprint 1.00
File:SIM868 Pin out(160120).pdf SIM868 HD-pinout 1.00
Protel99 original design file SIM808 HD-design file -
Sim808 Dev Board user manual SIM808 User Manual 1.0
File:SIM808 Hardware Design V1.00.pdf SIM808 HD 1.00
File:SIM808 CE Certificate.pdf SIM808 Certificate -


Arduino library

SIM7600 Series

Type Country GNSS Receiver 分集接收 Audo Open Linux Description
SIM7600E Europe / / / / -
SIM7600CE-T China Y Y Y Y -
SIM7600CE-L China NA NA NA NA -
SIM7600CE-L1 China NA NA NA NA old PA
SIM7600CE-L1C China NA NA NA NA -
SIM7600CE-JT1C China NA NA Y NA -

Obsolete (outdated should NOT use)


Board interface

  • D100  LED indicator 
  • CN101  6pin 2.54mm header interface 
  • J100  GPRS/GSM ANT 
  • J102  BT ANT(only for SIM800H) 
  • CN100  Micro SIM card socket 
  • C102  VRTC(Not mounted by default) 
  • TEST  2.8V 

Common Pin Definition

  • Power supply should provide sufficient current so that the  module  can  work  normally; the peak current is nearly 2A, will NOT work over 4.4V
name pin mark on pcb Description Comment
GND 1 and 6 G ground
Vbat 2 V Power range is from 3.4V to 4.4V.   Zenger diode is strongly recommended to anti surge on VBAT 
PWRkey 3 K Power down  Shorted with GND via R104 by default 
TXD 4 T Transmit Data TTL Series data Output 
RXD 5 R Receives Data  TTL Series data Input 

SIM800C-Full Board R1-old

SIM800C dev board dimension
  • Pin Definition
Pin Description Pin Description
GND Power ground VCC_IN power supply pin, input DC5V-20V, used to power the board
RI The kernel ringing pin DTR Data terminal preparation
TXD module serial send pin, TTL level (not directly connected to the RS232 level) RXD module serial receive pin, TTL level (not directly connected to the RS232 level)
U2_R module serial port 2 receive pin U2_T Module serial port 2 transmit pin
V_M This pin is used to convert the TXD and RXD of the GSM module board to the TTL logic of the corresponding target board. This is used to convert the TXD and RXD of the GSM module board to the corresponding TTL logic ADC ADC detection
SPP Core audio output pin SPN Core audio output pin
MC- Core audio input pin MC + Core audio input pin
PWR Pull down this pin to enable the module to be turned on or off BAT lithium battery input pin, 3.3v-4.4v


  • VBAT  MUST  be  lower  than  4.4V,  4.0V  is  recommended,  and  TXD/RXD are TTL level which can be directly connected with MCU.
  • Test pin, sim card voltage: Should confirm whether SIM card is inserted, and voltage test points should be 2.8V. 
  • Bluetooth must have enough current, USB power can not supply enough current


Supported countries for sim900A - > click to see on right side



Pin functions of SIM908

  • Pin RI: can indicate the incoming call with a TTL signal, this can also connect to a MCU port, it is connected to Net1 onboard LED too.
  • Board provide VCHG battery charge pin: as well as a temperature check pin for battery, when a lithium battery attach between pin VCHG and GND, it will be charged by a provided 4.2 volt.

SIM908 Dev. Board


Name Description
SW101 Power On/Off
GSM PORT Serial (AT command input,GPRS data input)
GPS PORT GPS debug test
LED D200 Power indication LED
LED D201 Working status indication LED
CN102 USB Port
J103 GSM Antenna Port
J100 GPS Antenna Port

Reference voltage test point

Reference voltage test point Voltage
Test Point 1 3.3V
Test Point 2 5.0V
Test Point 3 4.0V
Test Point 4 2.8V

SIM908 Mini Board

Status of On-board LEDs

Name Description
Net1 connect to pin RI, keep off when power on, will light on when there is an incoming call
Pwr Power status LED, keep constantly on
Net inform the network status, quick blink when network not yet registered or problematic, keep slowly blink when network registered.


  • Version 1.1: * Change main power LDO, may have better performance * Add extra power pins and Uart pins * Fit into a case design.
  • Version 1.2: Add extra logic leveled UART pins for arduino or Raspbery Pi such 5V or 3v3 devices


File Model Type Version
SIM908_Hardware Design_V1.06 SIM908 HD 1.06
Sim908 General Specification SIM908 SPEC -
SIM908 AT commands 1.02 SIM908 AT-commands 1.02
Eagle Library link SIM908 LIB -
SIM908 EVB Schematics SIM908 HD-design file -

Video tutorial

Pages in category "SIMCOM"

The following 12 pages are in this category, out of 12 total.