Total: R0.00
Total: R0.00

SIM900A GSM GPRS Wireless Extension Module (Without Antenna)

Original price was: R247.25.Current price is: R101.20. INC VAT

he SIM900A is a readily available GSM/GPRS module, used in many mobile phones and PDA. The module can also be used for developing IOT (Internet of Things) and Embedded Applications. SIM900A is a dual-band GSM/GPRS engine that works on frequencies EGSM 900MHz and DCS 1800MHz. SIM900A features GPRS multi-slot class 10/ class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.

9 in stock

Product Code: N/A SKU: COMP/04/S-038 Categories: ,


Model Type: 



The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5–4.5V power supply, optional power on self starting (default) and control start.
The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset.
The size of the module is 49*50, all the new and original device.
The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.
The serial port circuit: support for 3.3V single chip microcomputer. TTL serial port support
3.3 and 5V single chip microcomputer.
The SIM card circuit to increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, so as to ensure the signal strength.
PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5–4.5V power supply, ibid., suitable for lithium battery.
Control pin all leads.
A TTL level, compatible with 3.3V and 5V.
The two antenna interface, the default SMA straight head, connector for IPXmini antenna.
One way of speech interface, the way Mike interface.
The control interface of each pin description:
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST – SIM900A reset, active low
VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.
VCC5—-DC 5V input.
VCC4——DC3.5–4.5 input

Specification- SIM900A

Product Details:
1. Power Supply Requirements: 5V-18V power supply, current needs to provide 1A or above;
2. TTL level serial port is compatible with 3.3V and 5V microcontrollers.
3. It can truly communicate directly with 51/STM32/MP430 and other single-chip computers;
4. When debugging with a computer in the initial stage, it is recommended to use the CP2102 USB-TTL module to power the module and communicate
5. When using the single-chip microcomputer control module, you can also monitor the return data of the instruction through the USB-232 monitoring module, which greatly facilitates finding the problem, especially suitable for small partners who use 51 single-chip microcomputers.
6. The standby is about 30MA, and the sleep state can be set to about 10MA for low power consumption.
7. Support SMS, GPRS data transmission, MMS, DTMF, HTТP, FTP, PPP dialing and other functions.
8. At the same time, the hardware contains a reset pin. When a problem occurs in the module, this pin can be used to reset it.
9. The development board supports 2G/3G/4G mobile phone cards.

Onboard Resources:
Serial port circuit(with protection)
Antenna interface circuit(SMA bend female port)
SIM card circuit(flip SIM slot)
4*3.5 fixture hole 4pcs
SIM900A serial port output terminal