LM816-USB - 150Mbps Wi-Fi 4 USB Nano Adapter | LM Technologies
N.º da peça: LM816-USB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.05 | $130,50 |
| 100 | $11.6 | $1.160,00 |
| 500 | $10.15 | $5.075,00 |
| 1.000 | $9.1 | $9.100,00 |
LM816-USB Visão geral
A USB Wi-Fi adapter (also called a WLAN dongle) is a peripheral that adds wireless networking capability to a host device via the USB bus. It encapsulates the radio, baseband, MAC, and host interface into a self-contained module, allowing embedded systems, single-board computers, and PCs to join Wi-Fi networks without integrating a chipset directly on the motherboard. Within the wireless connectivity hierarchy, USB Wi-Fi adapters sit alongside PCIe Wi-Fi cards, SDIO Wi-Fi modules, and solder-down M.2 WLAN cards as one of the easiest ways to add Wi-Fi to a design.
Key features of the LM816-USB include a 1T1R (single transmit / single receive) radio chain, 20 MHz channel bandwidth, and 64/128-bit WEP, WPA, and WPA2 encryption. The adapter is powered directly from the USB 5 V rail, eliminating the need for an external power supply. A reference designator on the product page identifies it as "ADT, 802.11n, USB, 150Mbps, 5V Realtek 8188EUS, Nano". The adapter is pre-certified, which shortens time-to-market for OEMs that would otherwise need to certify a discrete radio.
The LM816-USB uses a Realtek RTL8188EUS single-chip 802.11n controller, which integrates the 2.4 GHz radio, MAC, and baseband. The dongle presents a USB 2.0 device to the host and exposes a Wi-Fi station through the standard WLAN NDIS / nl80211 interface on Linux or the Wi-Fi NDIS miniport on Windows. This chipset family is broadly supported by mainline Linux kernels, simplifying driver integration on embedded Linux hosts (note: Toradex lists the LM816 as HCI for Windows CE; embedded Linux support depends on the kernel version in use).
Typical applications include adding Wi-Fi to Raspberry Pi or other SBC projects, industrial control panels requiring wireless network access, point-of-sale terminals needing network connectivity, retro computing projects that need network access on legacy hardware, and embedded Linux development boards that lack an on-board Wi-Fi chipset. Its 150 Mbps link rate is sufficient for typical browser, email, and IoT telemetry workloads.
When designing with this adapter, consider that the USB connector orientation and dongle clearance must be planned at the chassis level. Because the radio radiates through the dongle body, the USB port should be positioned away from large metal structures that attenuate 2.4 GHz signals. For best throughput, place the host within line-of-sight of the access point and avoid operating near 2.4 GHz interference sources such as microwave ovens and Bluetooth peripherals.
This page synthesizes distributor inventory, datasheet specifications, chipset architecture, and application guidance for the LM816-USB, providing practical engineering context beyond what the manufacturer datasheet alone offers.
Alternativas drop-in para LM816-USB — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
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LM816-USB
✅ Drop-In✓ Em estoque
$9.1 / unidade
Ver ficha técnica →LM816-0648-2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM816-0648-1 US
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM816-USB Especificações (publicadas pelo fabricante)
| Product Type | Wi-Fi 4 USB Nano Adapter |
| Wireless Standard | IEEE 802.11 b/g/n (Wi-Fi 4) |
| Supported Standards | IEEE 802.11 b, g, n, e, i |
| Operating Frequency | 2.4 GHz ISM band |
| Maximum Data Rate | 150 Mbps |
| Radio Configuration | 1T1R (1 transmit / 1 receive) |
| Channel Bandwidth | 20 MHz |
| Host Interface | USB 2.0 |
| Chipset | Realtek RTL8188EUS |
| Network Modes | Ad-hoc and Infrastructure |
| Encryption | 64/128-bit WEP, WPA, WPA2 |
| Form Factor | USB Nano Dongle |
| Power Supply | USB bus powered (5 V) |
| Antenna | Internal printed antenna |
| Operating System Support | Windows, Windows CE, Linux (kernel dependent) |
| Compliance | IEEE 802.11 b/g/n/e/i |
| Status RoHS | Compliant |
Interfaces e Conectores do LM816-USB
LM816-USB expõe as seguintes interfaces e conectores conforme publicado pelo fabricante: Sem fios. A pinagem do header de expansão, a numeração dos pinos do conector e os limites elétricos estão definidos na documentação do fabricante.
| Sem fios | IEEE 802.11 b/g/n (Wi-Fi 4) |
Consulte a documentação do fabricante para a pinagem completa do conector de expansão e a numeração dos pinos do conector.
Aplicações típicas
LM816-USB é adequado para 6 aplicaçãos: Adding Wi-Fi to Raspberry Pi / Single-Board Computers, Industrial Control Panels and HMI, Point-of-Sale Terminals, IoT Gateway Devices, Legacy PC and Industrial PC Wireless Upgrade, Retro Computing and Hobbyist Projects.
Adding Wi-Fi to Raspberry Pi / Single-Board Computers
The LM816-USB is widely deployed to bring Wi-Fi 4 connectivity to single-board computers that lack on-board radios. The 150 Mbps PHY rate and Realtek RTL8188EUS chipset are supported by mainline Linux kernels (r8188eu / rtl8xxxu drivers), so no external driver build is required on Raspberry Pi OS, Ubuntu, or Buildroot-based images. Compared to a USB-to-Ethernet adapter plus a router cable, the LM816-USB avoids the wired tether and lets the SBC sit anywhere within AP range. The internal printed antenna is tuned for the 2.4 GHz band; for best signal, mount the SBC away from large metal ground planes.
Recomendado
Industrial Control Panels and HMI
Industrial HMIs and control panels often require wireless network access for telemetry, remote configuration, or factory-floor Wi-Fi. The LM816-USB's pre-certified RF design eliminates the cost and time of an in-house radio certification cycle, while its 150 Mbps throughput comfortably handles SCADA polling rates that are typically well below 1 Mbps. The dongle operates from the USB 5 V rail that already powers the HMI, simplifying integration. The RTL8188EUS chipset supports infrastructure mode for connection to plant access points, and WPA2 keeps traffic encrypted on the factory floor.
Recomendado
Point-of-Sale Terminals
Point-of-sale terminals need reliable wireless connectivity for payment processing, inventory sync, and cloud receipt services. The LM816-USB's 150 Mbps link rate far exceeds typical POS traffic, while the WPA2 encryption secures cardholder data in transit over Wi-Fi. The compact nano form factor fits inside small POS enclosures without protruding from the chassis, and USB bus powering avoids an extra power brick. Compared to integrated Wi-Fi modules, the LM816-USB lets a POS vendor reuse one mainboard across regions by simply swapping dongles.
Recomendado
IoT Gateway Devices
IoT gateways aggregate sensor data and forward it to cloud backends over Wi-Fi or Ethernet. The LM816-USB serves as a low-cost wireless uplink for gateways based on SBCs or embedded Linux hosts. Its 150 Mbps PHY rate is more than sufficient for typical IoT telemetry (sub-Mbps per gateway), while the small nano form factor keeps gateway enclosures compact. WPA2-Enterprise is supported via the underlying chipset driver stack, allowing corporate-network deployment.
Recomendado
Legacy PC and Industrial PC Wireless Upgrade
Older PCs, industrial PCs, and embedded boards shipped without Wi-Fi can be upgraded to wireless with the LM816-USB. A USB 2.0 port is all that is required, and Windows 7 / 10 / 11 ship with built-in support for the RTL8188EUS chipset. This avoids opening the chassis to install a PCIe Wi-Fi card. For Linux-based legacy hosts, the in-kernel rtl8xxxu driver enables plug-and-play connectivity.
Recomendado
Retro Computing and Hobbyist Projects
Retro computing enthusiasts use the LM816-USB to add Wi-Fi to vintage PCs, custom 6502 / Z80 builds, and hobbyist single-board computers. The 150 Mbps link is overkill for transferring disk images or Telnet sessions but provides headroom. Linux drivers are open-source, allowing hobbyists to debug and customize the network stack. The dongle is also popular for maker projects such as Wi-Fi controlled robots and weather stations where a simple USB attachment is preferable to soldering an SDIO module.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM816-USB — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | LM816-0648-2 | LM816-0648-1 US |
|---|---|---|---|
| Brand | LM Technologies | LM Technologies | LM Technologies |
| Package / Form Factor | USB Nano Dongle | USB Nano Dongle - same | USB Nano Dongle - same |
| Chipset | Realtek RTL8188EUS | Realtek RTL8188EUS - same | Realtek RTL8188EUS - same |
| Wireless Standard | 802.11 b/g/n (Wi-Fi 4) | 802.11 b/g/n (Wi-Fi 4) | 802.11 b/g/n (Wi-Fi 4) |
| Maximum PHY Rate | 150 Mbps | 150 Mbps | 150 Mbps |
| Operating Frequency | 2.4 GHz | 2.4 GHz | 2.4 GHz |
| Host Interface | USB 2.0 | USB 2.0 | USB 2.0 |
| Encryption | WEP / WPA / WPA2 | WEP / WPA / WPA2 | WEP / WPA / WPA2 |
| Region | Global (default SKU) | Global | US region |
Principais diferenciais
- Pre-certified RF design (vs Discrete RTL8188EUS module soldered on custom PCB)
- Wide mainline Linux driver support (vs Proprietary USB Wi-Fi chipsets requiring out-of-tree drivers)
- Compact nano form factor (vs Larger USB Wi-Fi adapters with external antennas)
Notas de projeto
The LM816-USB is an external USB dongle with an internal printed antenna tuned for 2.4 GHz. When integrating into an enclosure, ensure the USB connector is positioned so the dongle body is not surrounded by metal shielding or large ground planes. Avoid placing the USB port adjacent to large battery cells or aluminum chassis walls, which detune the antenna and reduce link range by 6-10 dB.
On Linux, the LM816-USB uses either the r8188eu or rtl8xxxu kernel driver depending on kernel version. On very old kernels (<4.x), the r8188eu driver must be built out-of-tree. On Windows CE hosts (Toradex recommends the LM816 HCI variant), the LM Technologies driver package must be loaded into the OS image at build time; check the Toradex image builder for bundled support.
USB 2.0 high-speed signalling is sensitive to cable length and connector quality. Although it is a wireless adapter, the USB host-to-dongle link still depends on good signal integrity at the USB connector. Use a chassis-mounted USB port with proper shielding and avoid flying leads. For best throughput, mount the dongle directly on a host USB-A port rather than through an unshielded extension cable.
Informações de conformidade
RoHS compliance confirmed by LM Technologies product page. REACH, halogen-free, and conflict-mineral declarations not explicitly published in the public datasheet. AEC-Q100 is not applicable because this is a consumer/industrial USB peripheral, not an automotive-grade IC.