LM849 - Wi-Fi 6/BT 5.2 2T2R USB Combo Module | LM Technologies
부품 번호: LM849 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.2 | $352.00 |
| 100 | $31.8 | $3,180.00 |
| 500 | $28.4 | $14,200.00 |
| 1,000 | $25.6 | $25,600.00 |
LM849 개요
A Wi-Fi module (also called a wireless module or RF module) is a pre-certified subsystem that integrates a radio transceiver, baseband processor, RF front-end, and host interface on a single PCB, enabling product designers to add wireless connectivity without writing a full driver stack or performing radio compliance testing from scratch. Wi-Fi modules sit at the bottom of the connectivity hierarchy: RF transceiver -> Wi-Fi/BT module -> wireless SoC -> semiconductor, and they are classified by radio technology (Wi-Fi 6 / 802.11ax), host interface (USB / SDIO / PCIe), and supported bands (2.4 GHz / 5 GHz / 6 GHz).
Key features of the LM849 include 2x2 MU-MIMO on 802.11ax with up to 1200 Mbps physical layer rate, Bluetooth 5.2 dual-mode (BR/EDR/LE) support, USB 3.0 SuperSpeed host interface, integrated RF shielding, and an industrial operating temperature range suitable for OEM embedded designs. The module is pre-certified in many jurisdictions, which removes a major certification barrier for low-to-medium volume product launches.
Typical applications include industrial IoT gateways, point-of-sale terminals, medical telemetry dongles, scientific instrumentation, and commercial wireless display adapters where a USB-attached radio is more practical than an M.2 card. The 2T2R configuration also benefits video streaming and VoIP endpoints that benefit from transmit beamforming and dual-stream receive diversity.
When designing with the LM849, confirm the host platform provides sufficient USB 3.0 bus power during radio transmit peaks (typical peak current ~900 mA) and that the chassis antenna path meets the 50 ohm controlled-impedance requirement of either the IPEX connector variant or the SMT RF pad variant.
드롭인 대체품: LM849 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LM849 (동일 폼 팩터 및 풋프린트) — 차이점: RoHS Status, Host Interface, MIMO Configuration, Mounting Type, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LM823
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$9.05 / 개
데이터시트 보기 →LM76005RNPR
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$2.18 / 개
데이터시트 보기 →LM849 사양 (제조사 공개)
| Wireless Standard | Wi-Fi 6 (IEEE 802.11ax) + Bluetooth 5.2 |
| Wi-Fi Bands | 2.4 GHz / 5 GHz dual band |
| MIMO Configuration | 2T2R (2x2) |
| Host Interface | USB 3.0 (backward compatible with USB 2.0) |
| Bluetooth Version | 5.2 (BR/EDR/LE dual mode) |
| Antenna Configuration | Dual on-board IPEX micro-coaxial or SMT RF line-out pads (factory option) |
| 공급 전압 | 5 V (USB bus powered) |
| Module Form Factor | USB dongle / module |
| 실장 유형 | USB plug-in or board-mount (factory option) |
| RoHS 상태 | Compliant (per LM Technologies product page) |
| Target Applications | OEM, industrial, medical, scientific, commercial |
| Radio Compliance | Pre-certified for major jurisdictions (per LM Technologies) |
LM849 인터페이스 및 커넥터
LM849은(는) 제조사에서 공개한 대로 다음 인터페이스와 커넥터를 제공합니다: 무선, 블루투스, 전력 입력. 확장 헤더 핀아웃, 커넥터 핀 번호, 전기적 한계는 제조사 문서에 정의되어 있습니다.
| 무선 | Wi-Fi 6 (IEEE 802.11ax) + Bluetooth 5.2 |
| 블루투스 | 5.2 (BR/EDR/LE dual mode) |
| 전력 입력 | 5 V (USB bus powered) |
다음을 참조하십시오: 제조사 문서 전체 확장 헤더 핀아웃 및 커넥터 핀 번호는 다음을 참조하십시오.
전력 및 열 특성
| 전력 입력 | 5 V (USB bus powered) |
제조사에서 공개한 LM849의 전력 입력 및 열 파라미터입니다.
일반적인 애플리케이션
LM849 적합 용도: 7 애플리케이션s: Industrial IoT Gateway, Point-of-Sale Terminal, Medical Telemetry Dongle, Scientific Instrumentation Wireless Adapter, Commercial Wireless Display Adapter, OEM Wireless Development Kit Host, Commercial Wireless Kiosk Connectivity.
Industrial IoT Gateway
The LM849 fits industrial IoT gateways that aggregate sensor data over Wi-Fi and BLE, because its USB 3.0 host interface attaches to any Linux SBC or industrial PC without M.2 routing and its 2T2R MIMO sustains reliable uplink even in metal-enclosed factory floors. Dual-band 2.4/5 GHz operation lets installers choose the band with cleaner spectrum, and Bluetooth 5.2 LE provides a backhaul for nearby battery-powered sensors. Placed in a USB port inside the gateway chassis with IPEX antennas brought out to the enclosure wall, the module adds wireless without driving host driver development, and unlike an M.2 card it does not consume a PCIe lane.
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Point-of-Sale Terminal
The LM849 is well-suited to POS terminals that need simultaneous Wi-Fi backhaul and Bluetooth peripheral pairing (barcode scanners, payment readers). Its USB 3.0 host interface plugs into any standard POS motherboard, and the 2T2R chain delivers robust Wi-Fi 6 throughput even in congested retail Wi-Fi environments where OFDMA helps share spectrum with customer phones. Bluetooth 5.2 LE supports modern payment-pager and BLE-based customer-engagement beacons. Unlike embedded radio modules, the LM849's pre-certified status shortens the time to FCC/CE/ISED compliance for retail rollouts.
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Medical Telemetry Dongle
The LM849 suits medical telemetry dongles attached to bedside monitors or portable diagnostic devices, where USB attachment to a host tablet PC is the most practical integration path. Its 2T2R MIMO and Wi-Fi 6 throughput sustain high-resolution vital-sign data uploads to hospital EMR servers, while Bluetooth 5.2 LE provides a body-area-network link to wearable sensors. The module's pre-certified radio compliance reduces the IEC 60601-1 system-level EMI/ESD verification workload, although module-level approval does not exempt the host chassis from full-system retest. The SMT RF pad variant permits trace antennas inside a sealed medical enclosure.
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Scientific Instrumentation Wireless Adapter
The LM849 is a good match for laboratory instruments that previously shipped with Ethernet only and now need wireless data offload for field or collaborative use. Its USB 3.0 host interface attaches without modifying the instrument's main board, and 802.11ax OFDMA maintains throughput even when many instruments share a lab AP. Bluetooth 5.2 enables tablet-based local control apps. The IPEX antenna variant keeps the RF path outside the metal-shielded instrument chassis, preserving EVM at high-order modulations.
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Commercial Wireless Display Adapter
The LM849 powers USB-attached wireless display adapters that stream 4K video to meeting-room screens, because Wi-Fi 6 2T2R + USB 3.0 bandwidth headroom is sufficient for compressed 4K/30 streams. Bluetooth 5.2 dual-mode carries HID for remote control and presence detection. Plug-and-play USB attachment lets integrators ship a single SKU that works across laptop operating systems, avoiding the driver-portability problems of PCIe-card adapters.
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OEM Wireless Development Kit Host
The LM849 is ideal as the wireless subsystem inside an OEM development kit or reference design that customers will integrate into their own products. Its USB 3.0 interface removes the need for M.2/PCIe trace routing on the customer's carrier board, and dual antenna variants let one SKU serve both trace-antenna and external-antenna designs. Pre-certified radio compliance lets customers skip the most expensive part of wireless certification. The module's published driver support for Linux, Windows, and macOS lets OEM customers target any host OS without per-OS RF bring-up.
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Commercial Wireless Kiosk Connectivity
The LM849 fits commercial kiosks (information, ticketing, self-checkout) where the Wi-Fi radio must be upgradeable in the field without opening the host chassis. Its USB plug-in form factor supports field swap-out for newer 802.11 standards without reworking the main board. 2T2R MIMO sustains throughput at the edge of AP coverage where single-stream radios lose link, and Bluetooth 5.2 LE supports proximity-triggered content delivery. Pre-certified compliance simplifies multi-jurisdiction kiosk rollouts.
추천
추천 제품 요약
엔지니어링 참조 데이터: LM849 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LM823 | LM760 |
|---|---|---|---|
| Brand | LM Technologies | LM Technologies | LM Technologies |
| Package | USB 3.0 module (IPEX or SMT RF pads) | USB 3.0 module (same form factor) | USB 2.0 module (same form factor) |
| Wireless Standard | Wi-Fi 6 (802.11ax) + BT 5.2 | Wi-Fi 5 (802.11ac) + BT 5.0 | Wi-Fi 5 (802.11ac) + BT 4.2 |
| Host Interface | USB 3.0 | USB 3.0 | USB 2.0 |
| MIMO Configuration | 2T2R | 1T1R | 1T1R |
| Wi-Fi Bands | 2.4 / 5 GHz dual band | 2.4 / 5 GHz dual band | 2.4 / 5 GHz dual band |
| Bluetooth Version | 5.2 (BR/EDR/LE) | 5.0 (BR/EDR/LE) | 4.2 (BR/EDR/LE) |
| Antenna Variant | Dual IPEX or SMT RF pads (factory option) | Single IPEX or SMT RF pad | Single IPEX or SMT RF pad |
주요 차별점
- 2T2R MIMO vs 1T1R alternatives (vs LM823)
- Wi-Fi 6 OFDMA vs Wi-Fi 5 OFDM (vs LM760)
- USB 3.0 SuperSpeed vs USB 2.0 high-speed (vs LM760)
- Bluetooth 5.2 LE Audio readiness vs BT 4.2 (vs LM760)
설계 노트
The LM849 draws peak current of approximately 900 mA from the USB 3.0 VBUS rail during simultaneous Wi-Fi TX and Bluetooth traffic. Confirm the host platform can supply this peak without voltage droop below 4.75 V; add a 220 uF bulk capacitor near the USB port if the upstream regulator has insufficient hold-up. Unlike 2.4 GHz-only modules, dual-band 5 GHz TX increases peak current demand by 30-40%, so budget the upstream regulator accordingly.
Keep the USB 3.0 SuperSpeed differential pair (D+/D- and SSRX/SSTX) on the host board routed as a 90 ohm differential impedance with no more than two vias total, and maintain a continuous ground reference plane beneath the traces. The SMT RF pad antenna variant requires a 50 ohm controlled-impedance trace from the module pad to the antenna feed, with no ground cutout beneath the trace. Place the LM849 away from switching DC-DC converters and high-speed digital clocks to preserve EVM at 1024-QAM MCS rates.
Do not assume Windows driver auto-install will succeed on a clean image; LM Technologies publishes signed WHQL drivers separately from the in-box Windows WLAN stack, and enterprise IT environments may block untrusted drivers. For Linux, ensure the kernel build includes CONFIG_CFG80211, CONFIG_MAC80211, and CONFIG_BT, and that the USB 3.0 xHCI driver is loaded before the radio enumerates. Field failures often trace to missing regulatory domain settings (regulatory.db / crda) rather than the module itself.
The LM849 dissipates approximately 2-3 W during sustained 2x2 802.11ax throughput at 5 GHz. In a sealed metal enclosure without airflow, junction temperatures can rise 30-40 C above ambient. Provide a thermal pad or copper pour on the carrier board beneath the module's ground tabs, and avoid stacking the LM849 directly above another heat-dissipating IC. Unlike passive modules, active 2T2R radios have a measurable thermal envelope that affects EVM at high temperature.
USB 3.0 SuperSpeed signaling at 5 Gbps is sensitive to impedance discontinuities; route the SSRX and SSTX pairs with matched length (within 150 mil) and avoid 90-degree bends. Maintain a keep-out zone of at least 3x the trace width from the differential pairs to any aggressor (clock, switching regulator). Eye-diagram compliance at the host connector should be verified with a USB 3.0 compliance fixture before deployment; marginal signals cause intermittent link drops that look like radio issues but are actually PHY issues.
규정 준수 정보
RoHS and lead-free status confirmed from LM Technologies product page. REACH, halogen-free, and conflict-minerals status not stated on the public product page - set to unknown pending direct vendor inquiry. AEC-Q100 not applicable (consumer/industrial module, not automotive-qualified).