BT740 Series Bluetooth Module

Not Recommended for New Design (NRND)

Overview

Every BT740 series Bluetooth module from Laird Connectivity is designed to add robust, long-range Bluetooth data connectivity to any device. Based on the market-leading Cambridge Silicon Radio (CSR) BC04 chipset, BT740 modules provide exceptionally low power consumption with outstanding Class 1 range via 18 dBm of transmit power. The modules support Bluetooth Version 2.1 specification, including Secure Simple Pairing (SSP), which improves security and enhances the ease of use for end customers. A broad range of Bluetooth profiles such as Serial Port Profile (SPP) and other vital features make BT740 modules superior to other Class 1 Bluetooth modules. Available in BT740-SA and BT740-SC variants.

Specifications

Bluetooth Version
2.1
Antenna Options
Integrated or External via u.FL
Chipset
CSR BC04
BT Class
Class 1
Certifications
FCC, ISED, EU, UKCA
Compliance
Lead-free and RoHS compliant
Data Rate
Over the Air: Up to 2.1 Mbps
UART: Over 350 kbps
Dimension (Height - mm)
15.29 mm
Dimension (Length - mm)
28.71 mm
Dimension (Width - mm)
3 mm
Logical Interfaces
UART (TX, RX, DCD, RI, DTR, DSR, CTS, RTS)
GPIO (8 configurable lines)
ADC (2 lines, 8 bit resolution)
Operating Temp (Max) (°C)
+85
Operating Temp (Min) (°C)
-40
Output Power
18 dBm
Power Consumption
Idle Mode – 1.25 mA
Transmit (Max Data) – 35 mA
Profiles
Serial Port Profile (SPP), Human Interface Device (HID), Health Device Profile )HDP)
Protocols
AT Command Set - 1 connection
Multi-Point API - 7 simultaneous connections
Range
Up to 1000 m
Receive Sensitivity
> -87 dBm
Stack On Board
Yes
Storage Temp (Max) (°C)
+85
Storage Temp (Min) (°C)
-40
Transmit Power (Max)
18 dBm from antenna
Voltage
Supply: 3.3 – 5.0V
I/O: 3.3V
Part NumberAntenna OptionsAntenna TypeBluetooth VersionChipset (Wireless)ComplianceConnectorData RateFrequency Range (Max)Frequency Range (Min)Logical InterfacesOS/SoftwareProduct TypeProtocolsRangeReceive SensitivitySystem ArchitectureTechnologyTransmit Power (Max)Wireless Specification
BT740-SC
Not Recommended for New Design (NRND)
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u.FL Connector External v2.1 QCA (CSR) BC04 FCC, ISED, EU SMT Up to 2.1 Mbps 2480 MHz2402 MHzSerial, GPIO, ADC AT Commands, Embedded Stack Embedded Module AT Command Set Up to 1 km Better than -87 dBm Hosted Bluetooth Classic, Bluetooth 2.1 +18 dBm Bluetooth v2.1 Enhanced Class 1
BT740-SA
Not Recommended for New Design (NRND)
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Internal v2.1 QCA (CSR) BC04 FCC, ISED, EU SMT Up to 2.1 Mbps 2480 MHz2402 MHzSerial, GPIO, ADC AT Commands, Embedded Stack Embedded Module AT Command Set Up to 1 km Better than -87 dBm Hosted Bluetooth Classic, Bluetooth 2.1 +18 dBm Bluetooth v2.1 Enhanced Class 1
DVK-BT740-SA
Not Recommended for New Design (NRND)
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Internal v2.1 QCA (CSR) BC04 RS232/USB Up to 2.1 Mbps 2480 MHz2402 MHzUSB, PCM, RS232 AT Commands Development Kit AT Command Set Up to 1 km Better than -87 dBm Hosted Bluetooth Classic, Bluetooth 2.1 +18 dBm Bluetooth v2.1 Enhanced Class 1
DVK-BT740-SC
Not Recommended for New Design (NRND)
Buy Now
u.FL Connector External v2.1 QCA (CSR) BC04 RS232/USB Up to 2.1 Mbps 2480 MHz2402 MHzUSB, PCM, RS232 AT Commands Development Kit AT Command Set Up to 1 km Better than -87 dBm Hosted Bluetooth Classic, Bluetooth 2.1 +18 dBm Bluetooth v2.1 Enhanced Class 1

Documentation

Name Part Type Last Updated
Application Note - BT7x0 Carrier Board.pdf All Application Note 01/17/2019
Application Note - BT740 Development Kit.pdf All Application Note 01/17/2019
Application Note - Bluetooth Latency and Data.pdf All Application Note 01/17/2019
RoHS 3 - Bluetooth All Certification 01/04/2022
User Guide - BT740 Firmware.pdf All Documentation 01/17/2019
Quick Start Guide - BT740 Development Kit.pdf All Documentation 01/17/2019
Hardware Schematic - BT740 Carrier Board.pdf All Documentation 01/17/2019
Product Brief - BT740.pdf All Product Brief 10/11/2021
Datasheet - BT740 Series.pdf All Datasheet 02/01/2021
User Guide - StringPlayer.pdf All Documentation 01/17/2019
Release Note - BT74x v2.3.1.280.pdf All Documentation 01/17/2019
Release-Notes-BTM74x v280.pdf All Software 01/17/2019
ITSE01014 03 BTM74x v2 3 1 280 0 UART Upgrade.zip All Software 01/17/2019
BT7x0-SA SC-asm asm.zip All Software 01/17/2019
MultipointHostSourceLibrary BTM74x.zip All Software 01/17/2019
Bluetooth Development Kit Terminal Download.zip All Software 01/17/2019
MpBtHost v3 5 0.zip All Software 01/17/2019
LairdTerminal v6 9 0.zip All Software 01/17/2019
Application Note - Guidelines for Replacing Antennas v1.0 All Application Note 01/17/2019
EU Certifications - BT730 and BT740 All Certification 11/20/2020
FCC Certifications - BT730 and BT740 All Certification 11/20/2020
ISED Certifications - BT730 and BT740 All Certification 11/20/2020
Regulatory Information - BT740 All Certification 02/22/2022
PCN 12B-2021 - BT7x0 Series All Documentation 02/18/2022
PCN 8B-2021 - BT7x0 Series All Documentation 02/18/2022

Certified Antennas

  • MAF94045

    MAF94045

    NanoBlue Series Bluetooth Internal Antenna
    Learn More

FAQ

Is a licence required to use the LC3 audio codec?

Use of the LC3 codec is included in the Bluetooth product licence when you qualify your product. No additional licence fees are required.

Do I still have to list/qualify my product with the BT SIG even if I don't use the BT logo?

Yes, you need to qualify/list any product that uses BT SIG intellectual property, even if you do not use the logo or require interoperability with other BT devices. see here for more details. Qualify Your Product | Bluetooth® Technology Website

 

Is it safe to run a Laird Connectivity Bluetooth module through a PCBA wash cycle?

In general, cleaning the populated modules is strongly discouraged. Residuals under the module cannot be easily removed with any cleaning process. 

  • Cleaning with water can lead to capillary effects where water is absorbed into the gap between the host board and the module. The combination of soldering flux residuals and encapsulated water could lead to short circuits between neighboring pads. Water could also damage any stickers or labels.
  • Cleaning with alcohol or a similar organic solvent will likely flood soldering flux residuals into the RF shield, which is not accessible for post-washing inspection. The solvent could also damage any stickers or labels.
  • Ultrasonic cleaning could damage the module permanently.

However, if water washing is required you will need to use deionized water. We do not recommend chemical cleaning and cannot guarantee it will not damage the modules. If you MUST clean PCB with chemicals it is recommended that you test on one board and then confirm the module still works after the process, prior to adding it to production, while understanding the above affects washing the populated PCBs can have on the module.

What is Laird Connectivity's product lifecycle EOL and PCN policy?

Laird Connectivity is committed to the long-term supply of all its standard embedded wireless modules and packaged products. Laird Connectivity’s products are specifically designed to meet the needs of the industrial and medical markets, which typically require 7 – 10 years product lifecycle. Although Laird Connectivity can’t guarantee that a component used in our products will not be obsoleted and cannot be reasonably substituted, Laird Connectivity can assure customers we will continue to sell our product when we have customer demand and can obtain the necessary components to build our products.

View our full policy here. 

What is the throughput of your bluetooth modules with the embedded AT command interface?

Our fully-embedded modules have a throughput of around 300-360 kbps.  They have an on-board Bluetooth stack and do all of the Bluetooth processing themselves. Bluetooth 2.1 + EDR has a practical transfer rate of 2.1 Mbit/s, but this is not possible on a small embedded module that does not have a powerful PC-type processor. 

For more information on the throughput of the BT740, see the following application note: BTM44X Enhanced Data Module: Throughput Analysis.  The throughput analysis on the BTM44X is also relevant to the BT740.

How is power adjusted on the B7xx?

While the power adjustment cannot be done manually, the radio automatically adjusts the Tx power based on the RSSI and Golden Receive Power Range values. For more information on this, please review the following guide: User Guide - BT740 Firmware.pdf

Become a Laird Connectivity Customer and Gain Exclusive Access to Our Design Services Team

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  • Embedded RF hardware / firmware design
  • Cloud architecture and integration
  • Mobile application development
  • Product & Industrial Design

Talk to an Expert

Buy Now

Distributor Part In Stock Region Buy
Digi-Key BT740-SA 494 North America Buy Now
Mouser BT740-SA 0 North America Buy Now
RS BT740-SA 0 EMEA Buy Now
RS BT740-SA 0 EMEA Buy Now
RS BT740-SA 0 EMEA Buy Now
Avnet BT740-SC 0 North America Buy Now
Farnell BT740-SC 0 EMEA Buy Now
Mouser BT740-SC 0 North America Buy Now
Newark BT740-SC 0 North America Buy Now
RS BT740-SC 0 EMEA Buy Now
RS BT740-SC 0 EMEA Buy Now
RS BT740-SC 0 EMEA Buy Now
element14 APAC BT740-SC 0 APAC Buy Now
Digi-Key DVK-BT740-SA 2 North America Buy Now
Farnell DVK-BT740-SA 0 EMEA Buy Now
Newark DVK-BT740-SA 0 North America Buy Now
element14 APAC DVK-BT740-SA 0 APAC Buy Now
Mouser DVK-BT740-SC 4 North America Buy Now
Avnet DVK-BT740-SC 0 North America Buy Now
Farnell DVK-BT740-SC 0 EMEA Buy Now
Newark DVK-BT740-SC 0 North America Buy Now
element14 APAC DVK-BT740-SC 0 APAC Buy Now

Distributors

Distributor Phone Number Region Website
Alpha Micro UK Only +44 1256-851770
EMEA Website
Arrow Electronics 1-855-326-4757
+44 2039 365486
APAC, North America, South America, EMEA Website
Avnet 1-480-643-2000
+44 1628 512900
APAC, North America, South America, EMEA Website
Cal-Chip Connect 1-215-942-8900
North America Website
Control Synergy +61-2-4966-5211
APAC Website
Digi-Key 1-800-344-4539
North America, South America, APAC, EMEA Website
EBV Elektronik EMEA Website
Farlink Technology +86 13266922199
APAC Website
Farnell 1-800-936-198
+44 3447 11 11 22
EMEA Website
Future Electronics 1-800-675-1619
1-514-428-8470
North America, South America, APAC, EMEA Website
Glyn +49-6126-590-0
EMEA Website
Jetronic China, Hong Kong and Taiwan 852-27636806 
APAC Website
Laird Connectivity 1-847-839-6925
+44 1628 858941
North America, South America, APAC, EMEA Website
M2M Germany +49-6081-587386-0
EMEA Website
Martinsson +46 8 7440300
EMEA Website
McCoy South East Asia +65 6515 2988
APAC Website
Mouser 1-800-346-6873
+44 1494 427500
North America, South America, APAC, EMEA Website
RS Components +852-2421-9898
+44 3457-201201
North America, South America, APAC, EMEA Website
Ryoyo Japan +81-3-3543-7711
APAC Website
Symmetry Electronics 1-866-506-8829
North America Website
Tekdis Australia and New Zealand +61 3 8669 1210
APAC Website
Telsys +972 3 7657666
EMEA Website