IoT Module Selection Guide: WiFi, BLE, LoRa, NB-IoT, Cellular Compared

IoT module selection for connected devices

IoT Module Selection Guide: WiFi, BLE, LoRa, NB-IoT, and Cellular

The module you pick sets the cost, battery life, and reach of the product — swapping it later means a new board spin. We've seen teams burn months on choices one design review could have settled. Here's how we match wireless tech to an application, with the modules we actually order.

Connectivity Options Compared

Technology	Range	Data Rate	Power	Cost/Module	Best For
BLE 5.3	100m	2 Mbps	µW	$2-5	Wearables, sensors
WiFi 6	100m	100+ Mbps	mW	$3-8	Smart home, cameras
LoRaWAN	10km	0.3-50 kbps	µW	$5-15	Agriculture, metering
NB-IoT	10km	100 kbps	µW	$3-8	Smart city, tracking
LTE Cat-M	10km	1 Mbps	mW	$8-20	Fleet, industrial
5G NR-Light	5km	150 Mbps	mW	$15-40	High-end industrial
Zigbee/Thread	100m	250 kbps	µW	$2-5	Home automation
Matter	100m	Varies	µW	$3-8	Multi-ecosystem smart home
UWB	30m	27 Mbps	mW	$5-10	Precise positioning
NFC	10cm	424 kbps	—	$0.5-2	Pairing, payments

Popular IoT Module Families

ESP32 Series (Espressif):

ESP32-C6: WiFi 6 + BLE 5 + 802.15.4 (Thread/Zigbee)
ESP32-S3: WiFi + BLE + AI acceleration (for vision/voice)
Best for: Cost-sensitive consumer IoT

nRF Series (Nordic Semiconductor):

nRF52840: BLE 5.4 + Thread + Zigbee, ultra-low power
nRF9160: NB-IoT + LTE-M with GNSS
Best for: Battery-powered, cellular IoT

STM32WL (STMicroelectronics):

Integrated LoRa + Arm Cortex-M4
Best for: Long-range, low-power sensor networks

Chinese IoT Module Makers

Quectel — World's largest cellular module maker. BC66 (NB-IoT), EC200U (LTE)
Espressif — ESP32 at massive scale. Open source SDK.
Ai-Thinker — Low-cost ESP32/ESP8266 modules, widely used in China
Fibocom — Cellular modules, strong in automotive and industrial
Neoway — NB-IoT and LTE Cat-1 modules for smart metering

Sourcing Considerations

Certification: Pre-certified modules (FCC/CE) save $10-50K in compliance testing vs chip-down designs. Below serious volume, pre-certified wins on that math alone.

Firmware support: Module SDK quality varies dramatically. Nordic and Espressif have the best developer ecosystems. A bad SDK quietly eats the savings.

Form factor: M.2, mini-PCIe, and LGA packages enable drop-in upgrades. Avoid modules that lock you to a single supplier's footprint. Qualify a second source from day one.

Lead times: When we order Quectel cellular modules, lead times typically run 4-8 weeks. Nordic nRF52/nRF53 lead times have normalized to 8-12 weeks after peaking at 52 weeks in 2023.

Wireless Connectivity Compared: BLE, WiFi, LoRa, Zigbee, Thread, Matter — Every protocol compared
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