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LM842-8425
USB Adapter, Bluetooth 5.0, Class 1, 1.3 Mbps, -90 dBm, 5 V, LM842 Series
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: LM TECHNOLOGIES
- Product type: Bluetooth Modules & Adaptors
- SVHC: No SVHC (17-Dec-2015)
- Interfaces: USB
- Product Range: LM842 Series
- Certifications: CE, FCC
- Bluetooth Class: Class 1
- Bluetooth Version: Bluetooth 5.0
- Supply Voltage Range: 5V
- Receiver Sensitivity Rx: -90 dBm
- Operating Temperature Range: -20 °C to 85 °C
| Delivery and price | |
|---|---|
| Units per pack | 100 |
| Price | 21.62 € |
| Current stock | 200+ |
| Lead time | 30 days |
Datasheet
Page 1 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface Revised 26/JAN/2021 Datasheet Version 2.0 Ordering Options See last page **==> picture [106 x 7] intentionally omitted <==** **----- Start of picture text -----**<br> Android 7 10<br>**----- End of picture text -----**<br> ## **Features** WiFi 802.11ac, abgn WiFi/Bluetooth® coexistence enabled USB 2.0 with multi interface controller Wave-2 compatible with MU-MIMO 32-37mm x 17.1mm x 9.4mm Bluetooth® v5.0 Dual Mode (Backwards compatible from Bluetooth® v4.2) WPA, WPA-PSK, WPA2, WPA2 -PSK and WEP (64bit & 128bit) encryption schemes Bluetooth® SIG, FCC, CE, Canada, Australia, Brazil, India, Pakistan, Russia, Singapore RoHS, REACH and WEEE, plus CCATS/ECCN. - 2.4 GHz and 5GHz ISM Frequency bands 2T2R 802.11n 2.4GHz WiFi 300Mbps data rate [Untested] 2T2R 802.11ac 5GHz WiFi 867Mbps data rate [Untested] 2T2R BT5.0 2.4GHz 1.3Mbps data rate [Tested] ## **Overview** The LM842 USB Adapter (Dongle) complies with Bluetooth® 5.0 (Dual Mode) and IEEE 802.11ac WiFi Standards of operation. Using a fully integrated single-chip that supports 2-stream 802.11ac solutions with Multi-user MIMO (Multiple-Input, Multiple-Output) ## **Supplied in two option form factors** With 2 x Onboard Metal Frame Antennas, or 1 x Metal Frame and 1 x SMA Compliant to; IEEE 802.11ac, abgn additional standards, Compliant to; Bluetooth® 5.02 and backward compatible with Bluetooth v2.1+EDR / v3.0 / v3.0+HS / v4.0, 4.1, & 4.2 with both BR/EDR. Classic and LE can operate simultaneously. connected via a (HCI) USB 2.0 TYPE A interface. ## depending on volumes. LM Technologies Ltd has a wealth of experience and has certified products all over the world, with access to a global network of local representatives, enabling fast certification processing when requested. Please enquire with us for further details. A Better Connection : +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 2 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## Wireless Wireless Standard WiFi: 802.11ac, abgndehi Bluetooth®: v2.1+EDR/v3.0/v3.0+HS/v4.2 Adapter Type Host Controller Interface (HCI) OS Compatibility Android, Linux, Windows 7, Windows 10 Security WiFi; WPA, WPA-PSK, WPA2, WPA2 -PSK and WEP (64bit & 128bit) Bluetooth®; Simple Paring Network Architecture WiFi; Ad hoc mode (Peer-to-Peer) and Infrastructure mode Software AP; WiFi Direct Bluetooth®; Pico Net; Scatter Net Hardware Chipset Realtek Antenna Onboard Chip Antenna Interfaces USB 2.0 Maximum Throughput 480Mbps (58.7MBps) ## RF Characteristics Tx Output Power WiFi; 17dBm – 802.11b@CCK 11Mbps 15dBm – 802.11g@OFDM 54Mbps 13dBm – 802.11n@MCS7_HT20 13dBm – 802.11n@MCS7_HT40 13dBm – 802.11a@OFDM 54Mbps 9Bm – 802.11ac@NSS1 MCS9_VHT80 Bluetooth®: Maximum 7.8dBm Rx Sensitivity ## WiFi; -80dBm – 802.11b@11Mbps -71dBm – 802.11g@54MBps -67dBm – 802.11n@MCS7_BW20 -64dBm - 802.11n@MCS7_BW40 -57dBm – 802.11ac@NSS1_MCS9_BW20 Bluetooth®: -89dBm@1Mbps -90dBm@2Mbps -83dBm@3Mbps +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 3 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## RF Characteristics |Range (in open space)|WiFi:| |---|---| ||220m| ||Bluetooth®:| ||Class 1| |Data Transfer Rate|WiFi:| ||802.11n mode up to 110Mbps| ||802.11ac mode up to 255Mbps| ||Bluetooth®:| ||Basic Rate 1.1 & 1.3Mbps| |Frequency|2.4GHz (2.4GHz - 2.4835GHz) and 5GHz (5.15GHz - 5.825GHz)| |Modulation Scheme|WiFi:| ||802.11b: CCK, DQPSK, DBPSK 802.11g/n: 64QAM, 16QAM, QPSK, BPSK| ||802.11ac: 256QAM, 64QAM, 16QAM, QPSK, BPSK| ||Bluetooth®:| ||8DPSK, π/4 DQPSK, GFSKFSK| |Spread Spectrum|WiFi:| ||IEEE 802.11b: DSSS (Direct Sequence Spread Spectrum)| ||IEEE 802.11ac/a/g/n: OFDM (Orthogonal Frequency Division Multiplexing)| ||Bluetooth®:| ||FHSS (Frequency Hopping Spread Spectrum)| |Operating Channel|WiFi (2.4GHz):| ||11: (Ch. 1-11) – United States 13: (Ch. 1-13) – Europe| ||14: (Ch. 1-14) – Japan| ||Bluetooth® (2.4GHz):| ||Ch. 0 to 78| |Physical Characteristics|| |Operating Temperature|-20°C to +85°C ambient temperature 5 to 90 % (non-condensing)| |Storage Temperature|-40°C to +90°C ambient temperature 5 to 90 % (non-condensing)| |USB Input Voltage|5v| |Dimensions (L x W x H)|32-37mm x 17.1mm x 9.4mm| |Weight|TBA| |Certifications|See our website or enquire for this products certifications.| |Compliance|RoHS, REACH and WEEE| |Warranty|2 Year Manufacturer RTB| +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 4 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface **Physical Dimensions (Version with 1 x SMA and 1 x Onboard Metal Frame Antenna)** **==> picture [393 x 249] intentionally omitted <==** **----- Start of picture text -----**<br> *31.80± 0.50<br>*9.40± 0.20<br>20.30 15.30<br>25.40<br>2.9<br>9.6<br>2.2<br>7.50<br>12.00<br>0.15 0.20<br>4.50± 17.00±<br>*<br>**----- End of picture text -----**<br> +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 5 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## **Physical Dimensions (Version with 2 x Onboard Metal Frame Antennas)** **==> picture [423 x 206] intentionally omitted <==** **----- Start of picture text -----**<br> *<br>31.80 ± 0.50<br>*<br>9.40 ± 0.20<br>20.30 15.30<br>2.9<br>9.6<br>2.2<br>7.50<br>0.15<br>± 2.001<br>4.50<br>0.20<br>±<br>17.00<br>*<br>**----- End of picture text -----**<br> +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 6 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## **XCVR Block Diagram (Version with 2 x Onboard Metal Frame Antennas)** ## 2.4GHz & 5GHz **==> picture [359 x 308] intentionally omitted <==** **----- Start of picture text -----**<br> Tx / Rx OTP<br>DPX<br>D+<br>Metal Frame WiFi<br>Antenna<br>D-<br>8822CU<br>Tx / Rx<br>LDO<br>DPX 3.3V 5V<br>Metal Frame WiFi / BT XTAL<br>Antenna 40MHz<br>2.4GHz & 5GHz<br>Tx / Rx<br>OTP<br>DPX<br>D+<br>Metal Frame WiFi<br>Antenna<br>D-<br>8822CU<br>Tx / Rx<br>LDO<br>DPX 3.3V 5V<br>ef AntennaSMA WiFi / BT XTAL :<br>40MHz<br>=<br>HOST INTERFACE<br>USB 2.0 CONNECTOR<br>HOST INTERFACE<br>USB 2.0 CONNECTOR<br>**----- End of picture text -----**<br> ## **XCVR Block Diagram (Version with 1 x SMA and 1 x Onboard Metal Frame Antenna)** ## **Extended Temperature Range** Housing Insulation coupled with a PCB and BOM that use components rated at -40c, other than the Realtek IC that is a 0c rated component. Our products undergo an intensive test regime which if the product sucessfully passes we then approve it for use at -20c and provide a warranty for the product for two years. Our temperature test report is available upon request. +44 (0) 207 428 2647 www.lm-technologies.com/contact Page 7 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## **Datasheet Version Notes** v1.4 12/NOV/2019 Added side view measurments to drawing dimensions. v1.5 13/NOV/2019 New photographs added. v1.6 15/NOV/2019 Removed Win 8/10 Compatibility until confirmed. v1.7 30/JUL/2020 Added Android, Linux, Windows 7, Windows 10 v1.8 30/NOV/2020 Dimensions amendment front page and General Spec page. v1.9 22 JAN 2021 Datasheet branding update. v2.0 26 JAN 2021 Bluetooth Tx Output Power updated to 7.8dBm. A Better Connection **+44(0) 207 428 2647 | sales@lm-technologies.com** +44 (0) 207 428 2647 **LM842** www.lm-technologies.com/contact Page 7 of 8 Page 8 of 8 **LM842 WiFi 802.11ac / Bluetooth® 5.0 2T2R USB Adapter** USB 2.0 Interface ## **Ordering Options** ## **Version with 2 x Onboard Metal Frame Antennas** 842-8420 ADPT 802.11ac BT5 USB 433Mbps 5v MF ANT 2T2R AO **Adapter Only** 842-8421 **US** ADPT 802.11ac BT5 USB 433Mbps 5v MF ANT 2T2R AO **Adapter Only** 842-8422 ADPT 802.11ac BT5 USB 433Mbps 5v MF ANT 2T2R RP **Retail Pack** 842-8423 **US** ADPT 802.11ac BT5 USB 433Mbps 5v MF ANT 2T2R RP **Retail Pack** 842-8424 ADPT 802.11ac BT5 USB 433Mbps 5v MF ANT 2T2R SP **Sample Pack** ## **Version with 1 x SMA and 1 x Onboard Metal Frame Antenna** |842-8425||ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO| |---|---|---|---|---|---|---|---| |842-8426|**US**|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R AO| |842-8427||ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP| |842-8428|**US**|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R RP| |842-8429||ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP|ADPT 802.11ac BT5 USB 433Mbps 5v MF SMA ANT 2T2R SP| **Adapter Only Adapter Only Retail Pack Retail Pack Sample Pack** http://www.lm-technologies.com/downloads +44 (0) 207 428 2647 www.lm-technologies.com/contact
Updated at April 28, 2026
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