Overview

The BTM420/BTM421 Bluetooth modules are designed to meet the needs of developers adding robust, short range Bluetooth data connectivity to their products and using embedded Bluetooth stacks within these products. They are based on the market-leading Cambridge Silicon Radio BC04 chipset, providing exceptionally low power consumption with outstanding range. Supporting the latest Bluetooth Version 2.1 Specification with EDR (Enhanced Data Rate), HCI Data Modules increase data throughput up to 2.1 Mbps. BT version 2.1 provides the advantage of Secure Simple Pairing that improves security and enhances ease of use for end customers.

Note: The BTM420-xx and BTM421-xx variants have reached end of production and are available on a limited basis only. Find the End of Life Announcement in the Documentation tab below.

Specifications

Antenna Options
Integrated antenna or External via Trace Pin
Bluetooth Version
v2.1 + EDR
Chipset
CSR BC04
Connector Type
SMT
Development Kit Contents
Development board
Dimension (Height - mm)
3.4 mm
Dimension (Length - mm)
22 mm
Dimension (Width - mm)
12.5 mm
Frequency
2.402 - 2.480 G
Logical Interfaces
SMT
Product Benefits
FCC, ISED, EU
Range
Up to 30 meters
Receive Sensitivity
Better than -84 dBm
Transmit Power (Max)
Class 2, +4 dBm (at antenna pad  BTM420), +4 dBm (from integrated antenna  BTM421)
Weight
.105 oz (3 g)
Wi-Fi Coexistence
2 wire and 3 wire schemes supported
Wireless Specification
802.11 b/g
Part NumberAntenna OptionsAntenna TypeBluetooth VersionChipset (Wireless)ComplianceConnectorData RateDevelopment Kit ContentsDimension (Height - mm)Dimension (Length - mm)Dimension (Width - mm)Frequency Range (Max)Frequency Range (Min)Input PowerLogical InterfacesOS/SoftwarePower ConsumptionProduct TypeProtocolsRangeReceive SensitivitySoftwareSystem ArchitectureTechnologyTransmit Power (Max)WeightWi-Fi CoexistenceWireless Specification
BTM420
End of Life (EOL)
Trace Pin External v2.1 + EDR QCA (CSR) BC04 FCC, ISED, EU SMT 2.1 MBps Development board 3.4 mm18 mm12.5 mm2480 MHz2402 MHz3.1 - 3.3V HCI AT Commands, HCI 32mA Embedded Module AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
BTM421
End of Life (EOL)
Internal v2.1 + EDR QCA (CSR) BC04 FCC, ISED, EU SMT 2.1 MBps Development board 3.4 mm24 mm12.5 mm2480 MHz2402 MHz3.0 - 3.3V HCI AT Commands, HCI 32mA Embedded Module AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm .105 oz (3 g) 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
DVK-BTM420
End of Life (EOL)
Internal v2.1 + EDR QCA (CSR) BC04 USB Pluggable 2.1 MBps 2480 MHz2402 MHzUSB, Serial AT Commands Development Kit AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR
DVK-BTM421
End of Life (EOL)
Internal v2.1 + EDR QCA (CSR) BC04 USB Pluggable 2.1 MBps 2480 MHz2402 MHzUSB, Serial AT Commands Development Kit AT Command Set Up to 30 meters -84 dBm Terminal Software Hosted Bluetooth Classic, Bluetooth 2.1 + EDR +4 dBm 2 wire and 3 wire schemes supported Bluetooth v2.1 + EDR

Documentation

Name Part Type Last Updated
Application Note - Bluetooth Latency and Data.pdf All Application Note 01/17/2019
RoHS 3 - Bluetooth All Certification 01/11/2024
Mini Dev Kit Schematics - BTM42x.pdf All Documentation 01/17/2019
Hardware Integration Guide - BTM42x Modules.pdf All Documentation 01/17/2019
User Guide - BTM42x Module.pdf All Documentation 01/17/2019
EOL - Bluetooth - Nov-15-2015.pdf All Documentation 01/17/2019
Product Brief - BTM42X Modules.pdf All Product Brief 07/09/2021
Bluetooth Development Kit Terminal Download.zip All Software 01/17/2019

FAQ

Is it safe to run a Ezurio 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.

Become a Ezurio (formerly Laird Connectivity) Customer and Gain Exclusive Access to Our Design Services Team

  • Antenna Scans
  • Antenna selection and placement
  • Custom antenna design
  • Worldwide EMC testing / certifications
  • Embedded RF hardware / firmware design
  • Cloud architecture and integration
  • Mobile application development
  • Product & Industrial Design

Talk to an Expert

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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
Braemac Australia, New Zealand, South East Asia +61 2 9550 6600
+64 9 477 2148
APAC Website
Cal-Chip Connect 1-215-942-8900
North America Website
DigiKey 1-800-344-4539
North America, South America, APAC, EMEA Website
EBV Elektronik EMEA Website
Farlink Technology China, Hong Kong +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
Solsta UK Only +44 (0) 1527 830800
EMEA Website
Supreme Components International India, South East Asia +65 6848-1178
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
WPG +44 1628 958460
EMEA Website