With a compact internal module size of 24mm x 24mm x 3mm, the SIM900A fits easily into slim and space constrained designs. The development board size is 49mm x 50mm and uses all new and original components. It supports optional power on self starting or controlled startup, dual power supply inputs, multiple antenna interfaces, and TTL serial communication compatible with both 3.3V and 5V microcontrollers.
Features
- Dual band GSM GPRS 900 and 1800 MHz support
- Supports voice, SMS, data, and fax communication
- Ultra compact SIM900A SMT module design
- Low power consumption with sleep mode support
- Two power supply interfaces for flexible powering options
- Optional automatic power on or controlled startup
- TTL serial interface compatible with 3.3V and 5V microcontrollers
- Onboard SMA antenna connector and IPX mini antenna interface
- Onboard SIM card slot with ESD protection
- Clear PCB silk screen markings for easy development
- Supports mobile phone SIM cards including 2G and compatible 3G 4G SIMs
Specifications
- Module internal size 24mm x 24mm x 3mm
- Development board size 49mm x 47mm
- Net weight 28g
- Total weight 38g
- Recommended current above 1A during large data transmission
Power Supply Options
- VCC5 5V DC input above 1A recommended for high data transmission
- USB 5V power supply supported for early computer debugging
- VCC4 3.5V to 4.5V input suitable for lithium battery power
- Standby current in tens of mA
- Sleep mode current as low as 10mA
Serial Communication
- TTL serial port with protection circuit
- Supports both 3.3V and 5V single chip microcontrollers
- RXD and TXD are TTL level and cannot be directly connected to RS232 level
Pinout of the Board:
- GND Ground
- SIMR SIM900A RXD TTL level input
- SIMT SIM900A TXD TTL level output
- RST SIM900A reset pin active low
- VCC_MCU Connect to 5V for 5V TTL communication or 3.3V for 3.3V TTL communication
- VCC5 DC 5V power input
- VCC4 DC 3.5V to 4.5V power input
Onboard Resources
- Serial port circuit with protection
- Antenna interface circuit with SMA female connector
- SIM card circuit with flip SIM slot and SMF05C ESD protection
- One microphone interface
- One speaker interface
- 4 mounting holes 4 x 3.5mm
- SIM900A serial port output terminals
With a compact internal module size of 24mm x 24mm x 3mm, the SIM900A fits easily into slim and space constrained designs. The development board size is 49mm x 50mm and uses all new and original components. It supports optional power on self starting or controlled startup, dual power supply inputs, multiple antenna interfaces, and TTL serial communication compatible with both 3.3V and 5V microcontrollers.
Features
- Dual band GSM GPRS 900 and 1800 MHz support
- Supports voice, SMS, data, and fax communication
- Ultra compact SIM900A SMT module design
- Low power consumption with sleep mode support
- Two power supply interfaces for flexible powering options
- Optional automatic power on or controlled startup
- TTL serial interface compatible with 3.3V and 5V microcontrollers
- Onboard SMA antenna connector and IPX mini antenna interface
- Onboard SIM card slot with ESD protection
- Clear PCB silk screen markings for easy development
- Supports mobile phone SIM cards including 2G and compatible 3G 4G SIMs
Specifications
- Module internal size 24mm x 24mm x 3mm
- Development board size 49mm x 47mm
- Net weight 28g
- Total weight 38g
- Recommended current above 1A during large data transmission
Power Supply Options
- VCC5 5V DC input above 1A recommended for high data transmission
- USB 5V power supply supported for early computer debugging
- VCC4 3.5V to 4.5V input suitable for lithium battery power
- Standby current in tens of mA
- Sleep mode current as low as 10mA
Serial Communication
- TTL serial port with protection circuit
- Supports both 3.3V and 5V single chip microcontrollers
- RXD and TXD are TTL level and cannot be directly connected to RS232 level
Pinout of the Board:
- GND Ground
- SIMR SIM900A RXD TTL level input
- SIMT SIM900A TXD TTL level output
- RST SIM900A reset pin active low
- VCC_MCU Connect to 5V for 5V TTL communication or 3.3V for 3.3V TTL communication
- VCC5 DC 5V power input
- VCC4 DC 3.5V to 4.5V power input
Onboard Resources
- Serial port circuit with protection
- Antenna interface circuit with SMA female connector
- SIM card circuit with flip SIM slot and SMF05C ESD protection
- One microphone interface
- One speaker interface
- 4 mounting holes 4 x 3.5mm
- SIM900A serial port output terminals