Skywire® 4G LTE CAT 1 AT&T Embedded Modem

Active Cell 560 mA
Average Power 152 mA
Idle 75 mA
Low-Power 7.6 mA
Input Voltage 3V-5.5V
I/O Voltage 1.65V-5.5V
Temperature Range -25º to +75ºC
Dimensions 29mm x 33mm x 10.5mm

End-Device Certified Modem

NimbeLink’s 4G LTE Cat 1 embedded modem for the AT&T cellular network. Designed for IoT and M2M applications, this modem offers the price and speed of obsolescent 2G technology with the long life and capabilities of the modern 4G LTE network.

Based on an Altair chipset, the Skywire 4G LTE Cat 1 embedded modem, and its Skywire Verizon companion model are the first Cat 1 LTE modems with FCC and carrier-required end-device-certification. End-device-certification eliminates months of testing and tens of thousands of dollars in cost and helps speed products to market.

Like other modems in the NimbeLink’s Skywire family, this new LTE Cat 1 modem is the smallest in the industry and is compatible with a variety of NimbeLink development kits and microprocessor shields, for fast, easy integration of cellular connectivity into new and existing products. It also shares the Skywire standard footprint with all other modems in the Skywire family, ensuring long product life. Its U.FL port provides antenna flexibility, and the modem requires just voltage and a UART or USB connection.  It supports a wide range of voltages for design flexibility.

Available now, contact us for more information.


  • Small form-factor
  • No carrier certification required
  • One design for deployment
  • Skywire standard footprint, simple integration
  • Easy migration path, future-proof
  • Low power
  • Speeds capable of 10mb/s Download /
    5mb/s Upload
  • U.FL port provides antenna flexibility
  • Development kits available


  • Approvals: FCC, PTCRB, AT&T
  • Micro-SIM slot size 3FF
  • LTE Bands B2(1900), B4(1700), B12(700)

 Featured Video

Skywire® Embedded Modem Roadmap

Skywire® Cellular Modems

Created by award-winning developers, Skywire® plug-in cellular modems are the fastest way to provide cellular connectivity for machine-to-machine (M2M) products and speed them to market. Within months of its introduction Skywire® was recognized for innovation and named a finalist for the ECN Impact Awards, Boards, Modules and Embedded Systems category.

Skywire® is the smallest end-device certified cellular modem on the market, making it quicker and easier to deploy than module down, external modems, or solder-in modules. It uses the Skywire standard form factor and its pre-certification eliminates months of delay and tens of thousands of dollars of cost for required certification.

It is easy to deploy, requiring just voltage and a UART connection and is more flexible than other plug-in modules, supporting a wider range of voltages and antenna connections.

Part Ordering Information

Part Number

Distributor Links



Skywire®, LTE CAT 1, AT&T, Firmware v11.50.173262


Skywire®, LTE CAT 1, AT&T, Firmware v11.50 171541, not recommended for new designs


Skywire®, LTE CAT 1, AT&T, Firmware v11.50 165131, not recommended for new designs


Skywire® development kit includes baseboard, antenna, power supply, SIM cards, and debug cables. (Does not include Skywire modem).


3FF Commercial Temp Range SIM card, AT&T


3FF Commercial Temp Range SIM card, T-Mobile


3FF Commercial Temp Range SIM card, Vodafone

4G LTE Modems for M2M Applications

Skywire 4G LTE CAT 1 modems are an enabling technology for M2M, the technology powering the emerging “Internet of Things”. Our LTE modules allow systems to independently collect data and transmit it to other systems. This allows systems to make decisions based not just on local input but on input from a far-flung network of sites and sources. Over a short distance it’s easy to connect separate devices either by wire or wirelessly. But for quick, easy communication to just about any fixed or mobile location it’s hard to beat the cellular network. Cellular works almost anywhere and is inexpensive to implement and use, but the biggest advantage of cellular may be the speed with which it can be implemented, both by the product developer and by the end user.

Choosing the right LTE module depends on your application and your location. LTE, sometimes referred to as 4G LTE, supports data speeds of up to 100 Mbps. While LTE can be implemented over several different spectra, compatible devices should work across all LTE spectra around the world. Its high throughput rate makes it ideal for streaming data applications like video and for other high-volume processes.

Choosing Cellular Access Technology

There are a variety of ways to incorporate LTE modules into a product or device. Key issues affecting your choice include location (as a factor in cellular network availability), product size, available expertise, time, cost, and your anticipated technology roadmap.

  • Consider the cellular network you will be using. If your product will have to access a range of network technologies, you will need to be able to support a corresponding range of cellular modems.
  • If size is an issue (as it is in so many devices today) external modems will not be a viable option; even some internal modules/modems may be too large to be practical.
  • Consider what components are built into the modem itself and what will have to be configured separately to make the module/modem work.
  • If you have the time and resources you can design a cellular module into your board. Or you can streamline the process by incorporating a ready-made pre-certified modem. Designing in a module will take engineering time.
  • Products that access the network must have FCC certification, which can take months. Designing in a pre-certified cellular modem eliminates the cost of obtaining certification and allows your device to be immediately activated on a network, reducing risk and speeding ROI.
  • A plug-in modem with a complete development kit will further streamline the process.
  • Cost has many components. In comparing cost of various cellular access options, look at development cost versus purchase cost as well as manufacturing and operating costs. Also consider the cost of obtaining certification if your product is not pre-certified.
  • The volume in which you will produce your product also helps determine your platform options. Designing a module into your board (as opposed to plugging in a certified modem) can make sense when the cost can be amortized over very large volumes (and when you can support the up-front cost). When your volume is less than huge, however, or when you need to pay as you go, purchasing modems makes more sense.
  • Finally, consider the trajectory of your product’s future development. If you expect your cellular needs to change—in speed, in network technology, or in related capabilities such as GPS—consider buying rather than building. It’s easier to change direction when that means buying a different product rather than having to develop a new one yourself. This is especially true if the modems you buy use a standard form factor that allows easy swap-out as generations change.

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