SIM900A Dual-Band GSM / GPRS Modem Module with SMA and PCB Antenna

SIM900A Dual-Band GSM / GPRS Modem Module with SMA and PCB Antenna is a reliable industrial cellular communication modem built around the dual-band SIMCom SIM900A cellular engine. Engineered specifically for regions operating on 900MHz and 1800MHz GSM frequencies, this board features standard 2.54mm UART headers, RS232 level-shifting circuitry, an onboard SMA antenna connector, and an external power jack, providing a rugged interface for embedded IoT telematics.

Key Features:

• Dual-Band 900/1800MHz Operation: Highly optimized for Asian and European cellular frequency bands.
• Flexible Power Architecture: Accommodates 5V to 12V DC power inputs via DC barrel jack or screw terminals with high burst filtering.
• Dual Serial Interfaces: Provides standard TTL UART headers for microcontrollers and DB9/RS232 headers for direct PC connection.
• Standard SMA Antenna Port: Rugged threaded SMA connector compatible with high-gain magnetic mount and stub antennas.
• Full Voice & Data Support: Incorporates 3.5mm audio jacks for microphone input and speaker output alongside SMS and GPRS.
• Comprehensive AT Command Set: Compatible with all standard Hayes and SIMCom AT commands for TCP, UDP, FTP, and HTTP.

Technical Specifications:

• Operating Voltage: 5V to 12V DC (Recommended 9V / 12V 2A DC adapter)
• Peak Transmission Current: Up to 2.0A
• Cellular Frequencies: EGSM 900 MHz and DCS 1800 MHz
• GPRS Multi-Slot Class: Class 10 / 8
• Baud Rate: Auto-baud (supports 1200 bps to 115200 bps)
• Audio Interface: Onboard 3.5mm microphone and speaker audio jacks
• Operating Temperature: -40°C to +85°C

Mechanical Specifications:

• PCB Structure: 4-Layer high-density FR-4 PCB with full ground shielding
• Antenna Connector: Standard Female SMA threaded connector
• Weight: Approximately 38 grams

Dimensions:

• Length: 50.0 mm
• Width: 48.0 mm
• Height: 14.0 mm

Pinout and Wiring:

• VCC: 5V – 12V DC Power Input
• GND: Ground (0V)
• TXD: UART TTL Serial Transmit (to MCU RX)
• RXD: UART TTL Serial Receive (to MCU TX)
• POWER_KEY: Module Power On/Off control toggle pin

Datasheet Reference:

• Datasheet Reference: Consult SIMCom SIM900A Hardware Integration Manual and SIM900 AT Command Set Documentation.

Commonly Used in:

• Industrial remote terminal units (RTU) and SCADA cellular links
• Automated SMS warning systems for water dams and weather stations
• Vending machine inventory and cashless telemetry payment units
• Solar inverter cellular monitoring gateways

Applications:

• Remote industrial machinery diagnostics and restart via SMS
• Automated cellular billing and remote utility meter reading
• Vehicle telematics and remote engine kill switches
• Security alarm monitoring with automated telephone dialing

Equivalent Models:

• SIM900 Quad-Band GSM Development Board
• SIM800A Dual-Band GSM Module
• Quectel M35 GSM Modem Module

Package Includes:

• 1 × SIM900A Dual-Band GSM / GPRS Modem Module with SMA and PCB Antenna