What are the different types of Bluetooth modules?

Since its debut in 1994, Bluetooth technology has developed into one of the most important wireless communication technologies in the fields of the Internet of Things and smart devices. With technological iterations, Bluetooth modules have also evolved into various types to meet the connection requirements in different scenarios. For smart hardware developers, iot solution providers and electronic product manufacturers, it is crucial to understand the characteristic differences of various Bluetooth modules. This article will systematically analyze the technical types, protocol versions, and application scenarios of Bluetooth modules to help you make precise selection decisions.

1. Classic Bluetooth Module (BR/EDR)
 

Features

• The Basic Rate/Enhanced Data Rate technology is adopted
• Relatively high transmission rate (2-3 MBPS)
• The power consumption is relatively high.
• Support continuous and stable data stream transmission

Typical applications

• Wireless audio devices (headphones, speakers)
• In-vehicle entertainment system
• HID devices such as keyboards and mice

2. Low-power Bluetooth Module (BLE)
Features

• Based on the Bluetooth 4.0+ low-power architecture
• Low transmission rate (1Mbps)
• The power consumption is only 1/10 of that of classic Bluetooth
• Support instantaneous connection

Typical applications

• Wearable devices (bracelets, smartwatches
• Medical monitoring equipment
• Beacon positioning system

3. Dual-mode Bluetooth module
Features

• It supports both classic Bluetooth and BLE simultaneously
• Balance high-speed transmission and low power consumption
• The hardware cost is relatively high.

Typical applications

• Smart home hub
• High-end wireless audio equipment
• Industrial-grade data acquisition terminal

1. Surface mount module
Features: SMT process, directly soldered onto the PCB

Advantages: Small size (minimum 6x6mm), low cost

Applicable to: Mass-produced consumer electronic products

2. Pin type module
Feature: Connected to the development board through pin headers

Advantage: Convenient for prototype development and debugging

Applicable: Product verification period/educational purposes

3. Antenna integration
Features: Built-in PCB antenna or ceramic antenna

Advantage: Simplified RF design

Note: The influence of the metal casing on the signal needs to be taken into consideration

4. External antenna type
Feature: Reserved IPEX antenna interface

Advantage: Scalable high-gain antenna

Applicable: Industrial environments/long-distance transmission scenarios

1. Consumer electronics grade
Certification requirements: FCC/CE/BQB (Example: zx8258 module and zx5005 module)

Typical parameters: Operating temperature -20℃ to 60℃

Price range: $0.5 to $3 per piece

2. Industrial grade
Certification requirements: Industrial EMC/ Anti-interference certification

Typical parameters: Wide temperature range from -40℃ to 85℃

Special design: Anti-static/anti-surge circuit

3. Automotive grade
Certification requirement: AEC-Q100

Reliability standard: Shock-resistant/moisture-resistant

Typical application: TPMS/ on-board diagnostics

Power consumption budget: BLE is the preferred choice for button battery power supply

Transmission requirement: Classic Bluetooth is required for audio transmission

Environmental conditions: For industrial environments, the -40℃ to 85℃ version should be selected

Certification requirements: Export products must obtain BQB certification

Development support: Evaluate the completeness of the SDK and the community ecosystem

The diversified development of Bluetooth modules provides precise wireless connection solutions for different application scenarios. For consumer-grade products, BLE modules with cost optimization can be given priority. For industrial Internet of Things projects, attention should be paid to anti-interference capabilities. As for audio devices, dual-mode solutions that support classic Bluetooth should be selected.