The SIM900A GSM GPRS Module is a widely used cellular communication module designed for voice, SMS, and data transmission over GSM networks. It supports quad-band GSM operation and is commonly used in IoT devices, remote monitoring systems, vehicle tracking, and SMS-based control applications. With standard AT command support and serial communication, the SIM900A is easy to integrate into embedded and automation projects.
Core Module Specifications
• Module Type: GSM / GPRS cellular communication module
• GSM Bands: Quad-band 850 / 900 / 1800 / 1900 MHz
• Network Services: Voice call, SMS, GPRS data
• Control Method: AT commands
Electrical & Interface
• Operating Voltage: 4.0 V – 5.0 V DC
• Peak Current: Up to 2 A during transmission bursts
• Communication Interface: UART (TTL serial)
• SIM Interface: Standard SIM card slot
• Antenna Interface: External GSM antenna (IPEX / SMA, variant dependent)
Performance Characteristics
• Reliable GSM network connectivity
• Supports SMS text and PDU modes
• Stable GPRS data transmission
• Fast network registration under good signal conditions
Physical Characteristics
• Module Type: PCB-mounted GSM module
• Onboard Components: Power regulation and RF circuitry
• Indicators: Network status LEDs
• Compact form factor for embedded use
Compatibility
• Arduino Uno / Mega / Nano
• ESP8266 / ESP32 (UART interface)
• STM32, AVR, PIC microcontrollers
• Embedded and industrial control systems
Key Advantages
• Proven and widely supported GSM module
• Easy serial interfacing using AT commands
• Supports voice, SMS, and data
• Large ecosystem of examples and libraries
Technical Insights
• Requires stable high-current power supply
• Logic level typically 5 V TTL
• GSM antenna quality affects signal performance
• Network availability depends on regional GSM support
Applications
• SMS-based control systems
• IoT and remote monitoring
• Vehicle tracking and alerts
• Industrial automation communication
• Home security and notification systems
Pro Tip
• Use a dedicated 5 V / 2 A power supply
• Keep antenna away from digital noise sources
• Add bulk capacitors near power input
• Check GSM network compatibility in your region
Package Includes
• 1 × SIM900A GSM GPRS Module