SIM 800C Quadband GSM GPRS Module
SIM 800C Quadband GSM GPRS Module
SIM 800C Quadband GSM GPRS Module
The SIM 800C is a compact quadband GSM/GPRS module that operates on 850/900/1800/1900 MHz frequencies, enabling global cellular connectivity for embedded systems and IoT applications. Electronics engineers, IoT developers, and embedded systems designers use this module to add voice calling, SMS, and GPRS data capabilities to microcontroller-based projects without requiring complex cellular infrastructure integration. This module solves the critical challenge of implementing cost-effective remote communication and real-time data transmission in applications ranging from GPS trackers to industrial monitoring systems and smart home devices.
Product Overview
The SIM 800C operates as a complete GSM/GPRS solution integrated into a single module, featuring an ARM7 processor core that handles all cellular protocol stack operations independently. The module communicates with host microcontrollers via UART serial interface using AT command set, eliminating the need for complex cellular protocol implementation. Its quadband frequency support ensures compatibility across global networks, making it ideal for international IoT deployments. The integrated power management circuit handles voltage regulation and current management, requiring only a stable 3.7-4.2V power supply with adequate current capacity during transmission peaks.
What distinguishes the SIM 800C is its optimized power consumption profile, consuming approximately 1.5mA in sleep mode and 25-100mA during active GPRS data transfer, making it suitable for battery-powered applications. The module includes built-in TCP/IP stack for direct internet connectivity, MQTT protocol support for IoT cloud integration, and robust error handling for unreliable network conditions. Its compact 24x24x3mm form factor and standardized pinout make it compatible with development boards and custom PCB designs, while the industrial-grade temperature range (-40 to +85°C) ensures reliable operation in diverse environmental conditions.
Key Specifications
| Specification | Details |
| Product Type | Quadband GSM/GPRS Cellular Module |
| Brand | SIMCom (Original) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Operating Frequencies | GSM 850/900/1800/1900 MHz, GPRS Class 12 |
| Power Supply | 3.7V to 4.2V DC, 2A peak current capacity |
| Communication Interface | UART (TTL level, 9600-115200 baud) |
| Data Speed | GPRS: up to 85.6 kbps, SMS: 160 characters |
| Operating Temperature | -40°C to +85°C industrial grade |
| Module Dimensions | 24mm x 24mm x 3mm compact form factor |
Key Features
- Quadband GSM/GPRS connectivity on 850/900/1800/1900 MHz frequencies for seamless global network compatibility and international roaming support
- Low power consumption with 1.5mA sleep mode and intelligent power management for extended battery life in portable IoT devices
- Built-in TCP/IP stack and MQTT protocol support enabling direct cloud connectivity without additional networking modules
- AT command interface via UART simplifying integration with Arduino, Raspberry Pi, STM32, and other microcontroller platforms
- Dual SIM capability option available for redundant connectivity and automatic network fallback in critical applications
- Industrial temperature range and robust error correction ensuring reliable operation in harsh environmental conditions
Applications and Use Cases
- GPS vehicle tracking systems requiring real-time location updates via GPRS data transmission to cloud servers with SMS alert capabilities
- Remote industrial monitoring and predictive maintenance systems transmitting sensor data from machinery in isolated locations without fixed internet connectivity
- Smart meter reading infrastructure for utilities collecting consumption data from distributed meters using GPRS and SMS fallback mechanisms
- Emergency alert systems and panic buttons in security applications leveraging voice calls and SMS for immediate notification delivery
- IoT environmental monitoring stations measuring temperature, humidity, and air quality with autonomous data logging and periodic cloud synchronization
- Automated vending machines and payment terminals requiring real-time transaction verification and inventory management via cellular networks
How to Use
To integrate the SIM 800C module, establish UART serial communication between your microcontroller and the module's RX/TX pins, ensuring proper voltage level conversion if your microcontroller operates at 5V logic levels. Insert an active GSM SIM card into the module's SIM slot, then apply stable 3.7-4.2V power supply with minimum 2A current capacity. Send AT commands through the serial interface to initialize the module, check network registration status using AT+CREG command, and configure GPRS parameters before establishing data connections.
For GPRS connectivity, use AT+SAPBR commands to configure the bearer settings with your mobile operator's APN (Access Point Name), then establish TCP/IP connections using AT+CIPSTART command. For voice calls and SMS functionality, use ATD for dialing numbers and AT+CMGS for sending text messages. Monitor signal strength using AT+CSQ command to ensure adequate network coverage, and implement error handling routines to gracefully manage network disconnections and automatic reconnection logic. Always maintain adequate power supply decoupling with 100µF capacitors near the module's power pins to handle current transients during transmission.
Frequently Asked Questions
What is the difference between SIM 800C and SIM 900A modules?
The SIM 800C is a newer quadband module supporting 850/900/1800/1900 MHz frequencies with better power efficiency and smaller form factor compared to the older SIM 900A. The SIM 800C consumes less power in sleep mode (1.5mA vs 2.5mA), has improved GPRS stability, and offers better compatibility with modern global networks. For new projects, SIM 800C is recommended due to superior performance and ongoing manufacturer support.
Can I use SIM 800C with 5V microcontroller boards directly?
No, the SIM 800C operates at 3.3V logic levels and requires voltage level conversion for 5V microcontroller boards. Use a dedicated level shifter IC or voltage divider circuit on the TX line from the microcontroller to the module's RX pin. The module's TX output can be connected directly to a 5V microcontroller's RX pin as the 3.3V signal is typically recognized as logic high. Always use a separate 3.7-4.2V power supply for the module rather than powering it from the microcontroller's 3.3V regulator.
How do I handle network disconnections and implement automatic reconnection?
Implement a periodic AT+CREG query every 30-60 seconds to monitor network registration status. When disconnection is detected, initiate a reconnection sequence by sending AT+CFUN=1 to reset the module's functionality, wait for network registration (AT+CREG response showing +CREG: 0,1 or 0,5), then reconfigure GPRS bearer and reestablish TCP/IP connections. Store connection parameters in EEPROM to enable faster reconnection without reconfiguring APN settings. Implement exponential backoff retry logic starting at 5 seconds and increasing to 5 minutes to avoid overwhelming the network during extended outages.
What power supply specifications are required for reliable operation?
The SIM 800C requires a stable 3.7-4.2V DC power supply capable of delivering minimum 2A peak current during transmission bursts. Use a dedicated power supply rather than powering from microcontroller regulators, as the module's current draw can cause voltage sag affecting both the module and the microcontroller. Install a 100µF electrolytic capacitor in parallel with the power supply pins as close as possible to the module, supplemented with 10µF and 1µF ceramic capacitors for high-frequency noise filtering. For battery-powered applications, use a 3.7V lithium battery with low internal resistance or implement a boost converter to maintain voltage regulation as battery voltage drops.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Returns: 7-day return policy on manufacturing defects only
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