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GSM-SIM900A-TTL
PACKAGE INCLUDES:
- 1 × SIM900A 850/900/1800/1900 MHz GSM Development Board
- 1 × SMA Antenna
GSM-SIM900A-TTL
Description
MINIMUM TECH FEATURES
- Module Type: GSM / GPRS Module
- Communication Interface: UART (TTL Serial)
- Power Supply Voltage: 3.4V – 4.4V (typically 4.0V)
- Frequency Bands: Quad-band GSM 850 / 900 / 1800 / 1900 MHz
- Data Rate: Up to 85.6 kbps (GPRS Class 10)
- Antenna Interface: SMA or PCB antenna connector (U.FL type on some variants)
- SIM Card Interface: Standard SIM card (1.8V / 3V)
- Operating Temperature: -40°C to +85°C
DESCRIPTION
- The SIM900A-TTL module provides reliable GSM/GPRS connectivity and communicates with microcontrollers using TTL serial interface (UART).
- It supports quad-band frequencies (850/900/1800/1900 MHz), ensuring compatibility with GSM networks worldwide.
- Enables voice calls, SMS, and GPRS data communication, ideal for remote monitoring and IoT applications.
- Controlled via standard AT commands, allowing developers to perform functions such as sending SMS, making calls, or connecting to the Internet.
- Features a standard SIM card slot and an external antenna connector (U.FL or SMA) for stable signal reception.
- Compact, SMT-based design makes integration into embedded systems or development boards straightforward.
- Suitable for Arduino, Raspberry Pi, ARM, AVR, PIC, 8051, and other microcontroller platforms.
- Commonly used in security systems, tracking devices, and wireless automation projects.
- Supported by detailed documentation, user manuals, and reference designs provided by SIMCom and resellers.
TECHNICAL SPECIFICATIONS
| Parameter | Specification |
| Compatible Platforms | Arduino, Raspberry Pi, ARM, AVR, PIC, 8051 |
| Frequency Bands | Dual / Quad Band GSM 900 / 1800 MHz (varies by region) |
| Power Supply | 12 V DC, 1 A – 2 A (recommended regulated source) |
| Operating Voltage (Module) | 3.4 V – 4.4 V DC |
| GPRS Data Rate | 85.6 kbps (Class 10) |
| Communication Interface | UART (TTL Serial) |
| SIM Card Support | 1.8 V / 3 V Standard SIM |
| Antenna Connector | SMA or U.FL |
| Operating Temperature Range | -20 °C to +55 °C (typical), -40 °C to +85 °C (absolute) |
| Dimensions (Approx.) | Varies by board layout (commonly 50 mm × 40 mm) |
| Power Consumption (Idle / Active) | ~25 mA / 500 mA peak (transmission burst) |
APPLICATIONS
- Cellular Communication Projects
- Home & Industrial Automation
- Remote Sensor Monitoring
- Security and Alarm Systems
- Robotics and Telemetry
- Mobile Communication Accessories
- IoT and Server Connectivity
- Automotive GSM Systems
- USB GSM Dongles and Modems
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