GSM-SIM900A-TTL

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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

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.

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)