4G LTE mini-PCIe modem module Quectel EC25-AFX, US LTE Cat 4

Quectel EC25-AFX is a 4G LTE Cat 4 mini-PCIe modem module designed for US LTE networks. It delivers cellular data connectivity for embedded systems, routers, gateways and industrial PCs via a standard mini-PCIe interface. The module supports LTE downlink and uplink speeds typical for Category 4 devices and is intended to provide stable mobile broadband and remote connectivity in applications that require reliable cellular access.

Advantages

The EC25-AFX offers a compact mini-PCIe form factor that simplifies integration into host devices. It supports widely used LTE bands in the US for broad network compatibility and provides the performance characteristics associated with LTE Cat 4. Its design focuses on straightforward interfacing with existing hardware and software environments, enabling data and IP-based communications over cellular networks without the need for extensive redesign of host systems.

Suitable for

• Embedded systems requiring cellular WAN connectivity
• Industrial routers and gateways for mobile data access
• Remote monitoring and telemetry devices
• Mobile point-of-sale and fleet management terminals
• Prototyping and product development with mini-PCIe slots

Key specifications

• Cellular category: LTE Cat 4 performance class (supporting typical Cat 4 downlink/uplink rates)
• Form factor: mini-PCIe card for direct host connectivity
• Intended network region: US LTE bands and network compatibility
• Primary function: cellular data modem for IP communications over 4G LTE
• Application domain: embedded, industrial and networking devices

How to use

Install the EC25-AFX into a compatible mini-PCIe slot on the host device and secure it according to the host’s hardware instructions. Connect required external antennas to provide adequate signal strength for LTE operation and attach power and ground through the host board. Configure the host operating system or router firmware to recognize the modem and set APN and network authentication parameters provided by the mobile operator. Use standard PPP or IP-based interfaces and the host’s network manager or command-line tools to establish and monitor the cellular data connection.

Usage recommendations

For reliable operation, use operator-approved SIM cards and verify supported LTE bands with the chosen carrier. Place external antennas with a clear orientation toward the cellular signal source and maintain proper grounding and RF shielding in industrial environments. Keep firmware and drivers up to date to ensure compatibility with host systems and network features.