SIM800C GSM Module – SMS/Data/Bluetooth Version – Upgrade Replacement for SIM900A Development Board [Non Original]

SKU: FA2034-1
Model

SIM800C (New Generation)
Frequency Bands

Quad-Band 850/900/1800/1900MHz
Bluetooth

Version 3.0 + EDR
GPRS Class

Multi-slot Class 12/10
Operating Voltage

DC 3.4V – 4.4V (Module) / 5V (Development Board)
Interface

UART Serial (TTL Level)
SIM Card Slot

Micro SIM
Audio

Supports 1x Analog Audio Channel (Mic/Speaker)
Operating Temp

-40°C to +85°C
Description
The SIM800C GSM Module represents the next generation of cellular connectivity for embedded systems. Engineered as a high-efficiency upgrade replacement for the SIM900A, the SIM800C offers a significantly smaller footprint, lower power consumption, and the added benefit of integrated Bluetooth 3.0 functionality.
This module is designed for developers and businesses requiring a versatile “all-in-one” wireless solution. It supports Quad-Band GSM/GPRS frequencies, ensuring reliable global performance for SMS messaging, voice calls, and GPRS data transmission. Whether you are upgrading an existing industrial monitoring system or designing a new IoT device that requires local Bluetooth control alongside long-range cellular data, the SIM800C provides a stable, professional-grade platform at a competitive price point.
Key Features
  • Quad-Band Global Connectivity: Supports 850/900/1800/1900MHz, allowing for worldwide network compatibility.
  • Integrated Bluetooth 3.0: Supports SPP (Serial Port Profile) and HID, enabling local wireless control and data exchange without extra modules.
  • Superior Power Efficiency: Optimized for battery-operated devices with an ultra-low power “Sleep Mode.”
  • Compact Upgrade: Fully compatible with the SIM900A command set while offering a more modern, space-saving hardware design.
  • Industrial Data Protocols: Built-in TCP/IP, UDP, HTTP, and FTP protocols for seamless cloud and server integration.
  • Flexible Interfacing: Onboard level-shifting circuitry allows for direct connection to 3.3V (STM32/ESP32) and 5V (Arduino) microcontrollers.
Usage Guide
  1. Antenna Mounting: Connect the GSM antenna to the IPX or SMA connector. Do not power the module without an antenna.
  2. Power Supply: Use a 5V power source capable of delivering 2A peak current. Standard USB ports may cause the module to reset during network searches.
  3. SIM Insertion: Insert a 2G-compatible Micro SIM card. Ensure the PIN code is removed using a mobile phone first.
  4. MCU Connection: Connect TXD (Module) to RXD (MCU) and RXD (Module) to TXD (MCU). Ensure the GND pins are connected.
  5. Bluetooth Activation: Use AT commands (e.g., AT+BTPOWER=1) to enable the Bluetooth function for local pairing.
Q: Is the SIM800C a direct drop-in replacement for the SIM900A?

Yes, in terms of software. It uses the same standard AT command set. However, the hardware footprint is smaller, making it an excellent “upgrade” for smaller PCB designs.

Q: Can I use the Bluetooth and GSM functions at the same time?

Absolutely. You can maintain a GPRS data connection to a server while simultaneously being connected to a smartphone via Bluetooth for local configuration.

Q: Why is my module not responding to "AT" commands?

First, check your baud rate (default is usually 9600 or Auto-baud). Second, ensure your TX/RX wires are not swapped. Third, verify that the module has sufficient power (the status LED should blink once every 3 seconds when registered).

Q: Does it work with 4G/5G SIM cards?

Yes, provided your carrier still supports 2G/GSM service. The module will communicate using the 2G bands available on the SIM card.

Q: Is this "Non-Original" version reliable for business use?
Yes. This version uses a high-quality, fully compatible chipset designed for mass-market IoT applications. It offers the same functional reliability as original modules but at a price point optimized for bulk purchasing and commercial scaling.

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