Choosing an MCU for a battery-powered IoT node
For an IoT node the figure that matters most is average current, not peak clock speed. Pick the radio and the sleep mode first; the core and flash size follow. Below is a cross-section of the low-power MCUs we stock, from BLE SoCs to general-purpose ultra-low-power parts.
Wireless SoCs
| Part we stock | Radio | Core | Typical role |
|---|---|---|---|
| nrf52840-qiaa-r | Bluetooth LE / Thread / Zigbee | Cortex-M4F | Multiprotocol node |
| nrf52832-qfaa-r | Bluetooth LE | Cortex-M4F | BLE sensor / beacon |
| esp32-c3fn4 | Wi-Fi + BLE | RISC-V | Cost Wi-Fi node |
| esp32-s3-wroom-1-n16r8 | Wi-Fi + BLE | Dual-core LX7 | Camera / edge AI |
| esp32-wroom-32e | Wi-Fi + BLE | Dual-core LX6 | General Wi-Fi |
Ultra-low-power general-purpose MCUs
| Part we stock | Core | Strength |
|---|---|---|
| stm32l051c8t6 | Cortex-M0+ | Low run & sleep current |
| msp430g2553ipw28r | 16-bit MSP430 | Ultra-low standby |
| msp430fr6972ipmr | 16-bit MSP430 FRAM | Fast wake, FRAM retention |
| stm32g030c8t6 | Cortex-M0+ | Cost 32-bit, 64 KB |
| stm32f030f4p6 | Cortex-M0 | Low-pin-count TSSOP-20 |
| rp2040 | Dual Cortex-M0+ | Flexible dual-core host |
Sizing notes
Budget flash for the protocol stack plus OTA if you need field updates — a BLE stack can consume well over 100 KB. Match RAM to your buffer depth. If the design must run for years on a coin cell, choose an ultra-low-Iq part and keep the radio duty cycle low rather than chasing a faster core.
Frequently asked questions
Which MCU is best for a coin-cell BLE sensor?
Start with the nRF52 family for its mature BLE stack and low sleep current; drop to a 16-bit ultra-low-power part if you do not need a radio.
Do you stock modules and bare chips?
Both — ESP32 modules come as complete modules while the other parts are bare MCUs. See the microcontroller category.
Can you help choose based on my power budget?
Share your duty cycle and target battery life via the BOM upload and we will shortlist parts within 2 business hours.
Recommended next steps
If you are sourcing any of the parts mentioned in this guide, we can help you confirm stock, pricing, and lead times quickly.
- Upload your BOM — send your full parts list and receive a consolidated quote within 2 business hours.
- Browse related in-stock lines: Microcontrollers / MCUs · Power Management ICs.
- Contact our team for hard-to-find or end-of-life components.
JTDZ Tech is an independent distributor of electronic components. Brand and part numbers are used for identification and cross-reference only; all trademarks belong to their respective owners. Always verify pinout, electrical limits and qualification status against the original device before substituting.
