SIM900A Compact GSM GPRS Module for IoT & M2M [Non Original]

SKU: FA2033
Model

SIM900A (Compact Series)
Frequency Bands

Dual-Band 900/1800MHz
GPRS Data Speed

Max 85.6 kbps (Downlink/Uplink)
Supply Voltage

DC 5V (Recommended 2A peak current)
Interface

UART (Serial)
SIM Card Type

Standard SIM (Mini-SIM)
Power Consumption

1.0mA (Sleep Mode)
Antenna Connector

IPX / SMA (Depending on board version)
Description
The SIM900A Compact GSM/GPRS Module is a cost-effective, high-performance cellular solution designed for the growing demands of the Internet of Things (IoT) and Machine-to-Machine (M2M) communication. This module allows your project to send and receive SMS, make voice calls, and transmit data over the GPRS network using standard AT commands.
This specific version is a widely compatible, high-quality alternative designed for developers and businesses looking for a budget-friendly way to add wireless connectivity to their hardware. Optimized for use with microcontrollers like Arduino, STM32, and Raspberry Pi, its compact form factor makes it ideal for remote monitoring stations, smart home security systems, and automated data logging where space and cost efficiency are critical.
Key Features
  • Dual-Band Connectivity: Operates on 900/1800MHz frequencies, covering most GSM networks globally.
  • SMS & Voice Support: Full capability for sending/receiving text messages and facilitating voice calls via an external audio interface.
  • GPRS Multi-slot Class 10: Enables efficient data transmission for remote sensor reporting and cloud connectivity.
  • Compact Integration: Small footprint with pin headers designed for easy mounting on PCBs or breadboards.
  • TTL Serial Interface: Communicates directly with 3.3V or 5V microcontrollers without the need for complex level shifting.
  • Industrial Temperature Range: Built to operate reliably in environments ranging from -40°C to +85°C.
Usage Instructions
  1. Antenna Connection: Always attach the GSM antenna before powering the module to prevent damage to the RF transmitter.
  2. SIM Card Placement: Insert a 2G-compatible SIM card into the onboard slot. Ensure the SIM is activated and has the PIN lock disabled.
  3. Power Supply: Connect a stable 5V power source. Note: During network registration, the module can draw up to 2A bursts; ensure your power supply can handle this to prevent rebooting.
  4. Wiring: Connect GND to GND, TXD to your MCU’s RX, and RXD to your MCU’s TX.
  5. Testing: Send the command AT via a serial monitor. If the module responds with OK, the communication is successful
Q: Is this module compatible with modern 4G/5G SIM cards?

Yes, most 4G/5G SIM cards are “backward compatible” and will work with this module, provided your local network provider still maintains a 2G (GSM/GPRS) network in your area.

Q: Can I use this for business-scale industrial monitoring?

Absolutely. While this is a cost-effective alternative version, it is widely used in commercial M2M applications for remote data reporting, such as smart utility meters and weather stations

Q: Why does the module frequently restart or lose signal?

This is usually due to insufficient current. GSM modules require high current peaks (up to 2A) during network handshakes. Ensure you are using a dedicated power supply rather than just a computer USB port.

Q: What is the difference between "Original" and this version?

This version utilizes a high-quality compatible chipset that provides the same AT command set and functionality as the original at a significantly lower price point, making it ideal for cost-sensitive projects and bulk manufacturing.

Q: Does it support GPS?

No, the SIM900A is a GSM/GPRS-only module. If you require location tracking, you would need to pair this with a separate GPS module or consider the SIM808 series

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