Ai-Thinker PB-03 is a compact BLE 5.2 module based on the PHY6252 low-power Bluetooth SoC, designed for IoT, smart home, mobile, and wearable applications. As part of the official Ai-Thinker PB series, the PB-03 supports SIG Mesh, low-power BLE communication, and practical embedded integration for connected products that need compact size, flexible interfaces, and stable wireless performance. The Ai-Thinker PB-03 BLE module is suitable for developers building smart lighting, smart sockets, smart air conditioners, portable devices, and low-power BLE Mesh systems. With support for secondary development, AT commands, FOTA, and multiple low-power states, the PB-03 provides a strong foundation for embedded Bluetooth product design. Features BLE 5.2 module based on the PHY6252 low-power Bluetooth SoC Supports SIG Mesh and low-power BLE communication for IoT and smart home products Supports Bluetooth data rates of 125Kbps, 500Kbps, 1Mbps, and 2Mbps Built-in 64KB SRAM, 256KB flash, 96KB ROM, and 256bit efuse according to the official specification Rich interfaces including UART, GPIO, ADC, PWM, I2C, I2S, SPI, PDM, and DMA Up to 19 IOs for flexible embedded system integration Supports multiple low-power working states, with deep sleep current below 1uA in official characteristics Supports serial local upgrade and remote firmware upgrade (FOTA) Supports secondary development with a Windows development environment and universal AT instructions AES-128 hardware encryption support for enhanced wireless security Specifications Parameter Details Brand Ai-Thinker Model PB-03 Core Chip PHY6252 Wireless Standard BLE 5.2 Mesh Support SIG Mesh Package SMD-52 Dimensions 16.6 x 13.2 x 2.8 mm (+/-0.2 mm) Antenna On-board antenna Frequency Range 2400 to 2483.5MHz Power Supply 2.7V to 3.6V, current above 200mA Interfaces UART, GPIO, ADC, PWM, I2C, I2S, SPI, PDM, DMA Available IO Up to 19 UART Rate Default 115200bps Security AES-128 SPI Flash 256KB Operating Temperature -40C to 85C Storage Environment -40C to 125C, less than 90% RH Applications IoT products requiring low-power BLE 5.2 communication and compact wireless integration Smart home devices such as smart sockets, smart air conditioners, and connected control modules Smart lighting and BLE Mesh networking systems Mobile devices and wearable electronics that benefit from low-power Bluetooth connectivity Embedded systems needing flexible interfaces, FOTA, and secondary development support Other Content Ai-Thinker PB-03 belongs to the official PB Bluetooth module series, which is positioned for smart lights, smart sockets, smart air conditioners, and other connected home appliances. The official PB series materials also highlight support for direct smartphone Mesh networking, app control, and integration with popular smart speaker ecosystems, making the PB-03 suitable for a wide range of BLE smart home applications. For engineering work, the PB-03 BLE module combines compact size with broad interface support and low-power behavior. Official documentation also emphasizes AT command support, secondary development, and firmware upgrade capability, which makes the Ai-Thinker PB-03 a practical option for both product development and embedded prototype evaluation. Resources Ai-Thinker PB series official topic page PB-03 specification PHY6252 chip datasheet PB-03 IC certificate PB-03 series CE RED certificate PB-03 series FCC certificate FAQ Does the PB-03 support BLE Mesh? Yes. According to the official PB series introduction and the PB-03 specification, the Ai-Thinker PB-03 supports SIG Mesh and is suitable for connected smart home and IoT applications. What chip is used in the PB-03? The PB-03 is based on the PHY6252 BLE SoC, which supports BLE 5.2, low-power operation, and multiple peripheral interfaces. Is the PB-03 suitable for low-power wearable and mobile products? Yes. Official materials position the Ai-Thinker PB-03 BLE module for IoT, mobile devices, wearable electronics, and smart home products that need compact low-power Bluetooth connectivity. Does the PB-03 support firmware upgrades and custom development? Yes. The official specification states support for serial local upgrade, remote firmware upgrade (FOTA), AT commands, and secondary development.
