SIM A7677S 4G LTE Development Board – Data Only

The SIM A7677S 4G LTE Development Board is a compact LTE Cat 1 IoT communication module based on the ASR1606 platform. It supports data-only applications (no call or SMS) over LTE-FDD/LTE-TDD networks, offering up to 10 Mbps downlink and 5 Mbps uplink. This version excludes GNSS and voice capabilities, focusing on pure IoT data transmission such as smart metering, industrial routers, tracking devices (via network LBS), and remote monitoring. It supports multiple protocols and OS drivers (Windows, Linux, Android) and maintains full AT command compatibility with SIM800 and SIM7000/SIM7070 series modules.

This SIM A7677S 4G LTE Development Board is an excellent choice for applications that require only data or internet connectivity without the need for voice call or SMS functions. It supports maximum 10Mbps downlink rate and 5Mbps uplink rate. This board features a serial interface and is based on the SIMCOM A7670C LTE modem. The serial interface allows for simple communication with a computer or laptop via a USB to Serial adapter or TTL converter. AT instructions are used to communicate with the A7672S.

The SIM A7677S 4G LTE Development Board is designed keeping in mind the requirements of the user. It has various pinouts from the module, such as  DTR – to use the 4G Module in ultra low power sleep mode, STATUS – to detect the status of 4G Module, NETLIGHT – in case developer wants to use external LED to indicate network status, RESET – developer can use this pin to connect with MCU and reset the module if required.

The SIM A7677S 4G LTE Development Board supports multiple built-in network protocols like HTTP, HTTPS, MQTT, FTP, FTPS etc., supports drivers for main operation systems (USB driver for Windows, Linux and Android etc.) and software function, AT commands are compatible with A76XX , SIM7500/SIM7600 series modules.

This SIM A7677S 4G LTE Development Board has onboard UART Logic Level Conversion, and Vdd needs to be connected to host reference voltage. It has a UFL connector, which allows connection of any antenna with this board. Apart from this, the module is very compact in size. It can be easily embedded in any customized PCB (Eagle library available in Downloads), and it can also be mounted using screws.

Note: This module is physically identical with KSTM1234 , KSTM1222, KSTM1009, KSTM1548 and Pin to Pin Compatible with KSTM1927. All modules share the same dimensions, connectors, and pin configurations, ensuring seamless compatibility.

Note: Warranty claims are not entertained for short-circuited boards.

Features: 

• Based on SIMCom A7677S LTE Cat 1 module (No GNSS / No Call-SMS)
• Supported Band: LTE-FDD B1/B3/B5/B8 , LTE-TDD B34/B38/B39/B40/B41
• Data Transfer Rate: 10 Mbps Downlink / 5 Mbps Uplink
• Input Supply Voltage: 5V–12V DC
• Power Consumption: 300 mA active / <10 mA sleep mode
• On board UART logic level conversion
• Micro SIM Card Holder onboard
• U.FL Antenna Connector for external antenna
• ESD protection for antenna and power lines
• Onboard Pins: DTR, STATUS, NETLIGHT, RESET
• Compatible AT Commands: A76XX Series
• Compact design, mountable via screw holes
• Ultra low sleep mode current consumption: <10mA