STMicroelectronics

STM32WL55JCI6 - Dual-core Arm Cortex-M4/M0+ LoRa SoC | STMicroelectronics

Name: STM32WL55JCI6
Brand: STMicroelectronics
Price: 12.50 USD
Availability: InStock

MPN: STM32WL55JCI6 ✓ Active

In Stock (99,999) Ships in 1-3 business days

1.8V to 3.6V Vdss 1.62 uA (with RTC) Id UFBGA-73 (7x7 mm) Package 150 MHz to 960 MHz Speed 256 KB Memory

$12.5 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$12.5	$12.50
10	$11.25	$112.50
100	$10	$1,000.00
500	$9	$4,500.00
1,000	$8.1	$8,100.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for STM32WL55JCI6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

STM32WL55JCI7

✅ Drop-In

📦 UFBGA-73

Extended temperature range (-40C to +105C) vs -40C to +85C

📋 Reference alternative (not in catalog)

STM32WL54JCI6

✅ Drop-In

📦 UFBGA-73

No security features (AES, TRNG) but same core and radio

📋 Reference alternative (not in catalog)

STM32WL55JCI6TR

✅ Drop-In

📦 UFBGA-73

Tape and reel packaging variant, same die

📋 Reference alternative (not in catalog)

ℹ️ 1 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

STM32WL55JCI6 Maximum Ratings & Electrical Characteristics

Core	Arm Cortex-M4 (64 MHz) + Cortex-M0+ (48 MHz)
Flash Memory	256 KB
SRAM	64 KB
Radio Frequency Range	150 MHz to 960 MHz
Modulation	LoRa, (G)FSK, (G)MSK, BPSK
Max Output Power	+22 dBm
Receiver Sensitivity	-137 dBm (LoRa)
Supply Voltage	1.8V to 3.6V
Operating Temperature	-40C to +85C
Package	UFBGA-73 (7x7 mm)
Mounting Type	Surface Mount
ADC	12-bit, 1 MSPS
DAC	12-bit
Interfaces	UART, SPI, I2C, LPUART
Security	TRNG, AES-256, CRC
Low Power Modes	Sleep, Stop, Standby
Standby Current	1.62 uA (with RTC)
RX Current	4.82 mA
TX Current	87 mA at +14 dBm
RoHS Status	Compliant

STM32WL55JCI6 Pin Configuration

Pin A1	VDD — Power supply
Pin A2	VSS — Ground
Pin A3	PA0 — GPIO/ADC
Pin A4	PA1 — GPIO/ADC
Pin A5	PA2 — GPIO/USART
Pin A6	PA3 — GPIO/USART
Pin A7	PA4 — GPIO/SPI
Pin A8	PA5 — GPIO/SPI
Pin A9	PA6 — GPIO/SPI
Pin A10	PA7 — GPIO/SPI
Pin B1	PB0 — GPIO/ADC
Pin B2	PB1 — GPIO/ADC
Pin B3	PB2 — GPIO
Pin B4	PB3 — GPIO
Pin B5	PB4 — GPIO
Pin B6	PB5 — GPIO
Pin B7	PB6 — GPIO/I2C
Pin B8	PB7 — GPIO/I2C
Pin B9	PB8 — GPIO
Pin B10	PB9 — GPIO
Pin C1	PC0 — GPIO/ADC
Pin C2	PC1 — GPIO/ADC
Pin C3	PC2 — GPIO/ADC
Pin C4	PC3 — GPIO/ADC
Pin C5	PC4 — GPIO
Pin C6	PC5 — GPIO
Pin C7	PC6 — GPIO
Pin C8	PC7 — GPIO
Pin C9	PC8 — GPIO
Pin C10	PC9 — GPIO
Pin D1	PD0 — GPIO
Pin D2	PD1 — GPIO
Pin D3	PD2 — GPIO
Pin D4	PD3 — GPIO
Pin D5	PD4 — GPIO
Pin D6	PD5 — GPIO
Pin D7	PD6 — GPIO
Pin D8	PD7 — GPIO
Pin D9	PD8 — GPIO
Pin D10	PD9 — GPIO
Pin E1	PE0 — GPIO
Pin E2	PE1 — GPIO
Pin E3	PE2 — GPIO
Pin E4	PE3 — GPIO
Pin E5	PE4 — GPIO
Pin E6	PE5 — GPIO
Pin E7	PE6 — GPIO
Pin E8	PE7 — GPIO
Pin E9	PE8 — GPIO
Pin E10	PE9 — GPIO
Pin F1	RFI — RF input
Pin F2	RFO — RF output
Pin F3	VDD_RF — RF power supply
Pin F4	VSS_RF — RF ground
Pin F5	NRST — Reset
Pin F6	BOOT0 — Boot mode select
Pin F7	VDDA — Analog power supply
Pin F8	VSSA — Analog ground
Pin F9	VREF+ — ADC reference
Pin F10	VREF- — ADC reference
Pin G1	PH0 — Crystal oscillator
Pin G2	PH1 — Crystal oscillator
Pin G3	PC14 — GPIO/OSC32
Pin G4	PC15 — GPIO/OSC32
Pin G5	VDD — Power supply
Pin G6	VSS — Ground
Pin G7	VDD — Power supply
Pin G8	VSS — Ground
Pin G9	VDD — Power supply
Pin G10	VSS — Ground

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

STM32WL55JCI6 is suitable for 6 applications: Smart Agriculture, Smart Metering, Asset Tracking, Industrial Monitoring, Smart City, IoT Gateways.

🌾

Smart Agriculture

The STM32WL55JCI6 is ideal for smart agriculture applications such as soil moisture monitoring, weather stations, and irrigation control. Its long-range LoRa radio (up to +22 dBm output, -137 dBm sensitivity) enables communication over several kilometers in rural areas. The low standby current (1.62 uA) allows battery-powered sensors to operate for years. The dual-core architecture lets the M0+ core handle the LoRaWAN stack while the M4 core processes sensor data, improving efficiency. In a typical soil moisture sensor, the STM32WL55JCI6 reads an analog sensor via the 12-bit ADC, processes the data, and transmits it via LoRa to a gateway. The device's wide supply voltage range (1.8V-3.6V) accommodates various battery chemistries. Designers should consider the RF layout and antenna matching to maximize range. The STM32CubeWL software provides ready-to-use examples for LoRaWAN, accelerating development.

Recommended

SX1262 (External radio alternative (not drop-in)) STM32L071 (Low-power MCU for sensor nodes)

📊

Smart Metering

The STM32WL55JCI6 is well-suited for smart gas, water, and electricity meters. Its sub-GHz radio supports long-range communication in urban environments, and the low power consumption ensures long battery life. The device's security features (AES-256, TRNG) protect metering data. In a smart gas meter, the STM32WL55JCI6 reads flow sensors, calculates consumption, and transmits readings periodically via LoRaWAN. The dual-core design allows the M0+ core to manage the radio protocol while the M4 core handles metrology calculations. The device's wide operating temperature range (-40C to +85C) is suitable for outdoor installations. The UFBGA-73 package is compact, fitting into small meter housings. Designers should ensure proper isolation between the RF section and metering circuits to avoid interference. The STM32CubeWL includes metering application examples.

Recommended

SX1276 (Radio transceiver alternative) STM32L4 (MCU for metering applications)

📍

Asset Tracking

The STM32WL55JCI6 is perfect for asset tracking devices that require long-range communication and low power. Its LoRa radio can transmit location data over several kilometers, and the device's low power modes extend battery life. The integrated GPS-less tracking can use RSSI-based localization or external GNSS modules. In a typical asset tracker, the STM32WL55JCI6 periodically wakes from Standby mode, acquires location data from a GNSS module via UART, and transmits it via LoRa. The device's small package (UFBGA-73) allows compact tracker designs. The dual-core architecture enables efficient handling of the radio stack and application code. Designers should consider antenna placement for optimal RF performance. The STM32CubeWL provides examples for LoRaWAN-based tracking.

Recommended

u-blox M8 (GNSS module for location) SX1261 (Radio transceiver alternative)

🏭

Industrial Monitoring

The STM32WL55JCI6 is suitable for industrial monitoring applications such as predictive maintenance, environmental monitoring, and equipment health tracking. Its robust radio link and wide temperature range make it reliable in harsh industrial environments. The device's multiple interfaces (UART, SPI, I2C) allow connection to various sensors. In a vibration monitoring system, the STM32WL55JCI6 reads accelerometer data via SPI, performs FFT on the M4 core, and transmits spectral data via LoRa. The low power consumption enables battery-powered wireless sensors. The security features protect sensitive industrial data. Designers should ensure proper EMC protection on the RF path. The STM32CubeWL includes examples for industrial sensor nodes.

Recommended

IIS3DWB (High-bandwidth accelerometer) STM32L0 (Low-power MCU alternative)

🏙️

Smart City

The STM32WL55JCI6 is ideal for smart city applications like smart lighting, waste management, and parking sensors. Its long-range LoRa radio enables city-wide coverage with minimal infrastructure. The low power consumption allows battery-powered devices to operate for years. In a smart parking sensor, the STM32WL55JCI6 detects vehicle presence via a magnetic sensor, processes the data, and sends status updates via LoRaWAN. The device's small package and wide supply voltage range make it easy to integrate into compact sensor nodes. The dual-core architecture allows efficient handling of the radio stack and sensor processing. Designers should consider the RF environment in urban areas and optimize antenna design. The STM32CubeWL provides examples for smart city applications.

Recommended

SX1272 (Radio transceiver alternative) STM32L1 (Low-power MCU alternative)

🌐

IoT Gateways

The STM32WL55JCI6 can be used in IoT gateways to aggregate data from multiple sensor nodes and forward it to the cloud. Its dual-core architecture allows the M0+ core to handle the LoRa radio while the M4 core runs the gateway application and network protocols. The device's multiple UART/SPI interfaces enable connection to cellular or Ethernet modules for backhaul. In a typical gateway, the STM32WL55JCI6 receives LoRa packets from sensors, decodes them, and forwards them via a 4G module. The device's security features ensure secure communication. Designers should consider power supply stability and thermal management for continuous operation. The STM32CubeWL includes gateway examples.

Recommended

SX1301 (LoRa concentrator for gateways) STM32F4 (High-performance MCU for gateways)

Recommended Products Summary

SX1262 External radio alternative (not drop-in) Used in: Smart Agriculture STM32L071 Low-power MCU for sensor nodes Used in: Smart Agriculture SX1276 Radio transceiver alternative Used in: Smart Metering STM32L4 MCU for metering applications Used in: Smart Metering u-blox M8 GNSS module for location Used in: Asset Tracking SX1261 Radio transceiver alternative Used in: Asset Tracking IIS3DWB High-bandwidth accelerometer Used in: Industrial Monitoring STM32L0 Low-power MCU alternative Used in: Industrial Monitoring SX1272 Radio transceiver alternative Used in: Smart City STM32L1 Low-power MCU alternative Used in: Smart City SX1301 LoRa concentrator for gateways Used in: IoT Gateways STM32F4 High-performance MCU for gateways Used in: IoT Gateways

What is the STM32WL55JCI6?

The STM32WL55JCI6 is a wireless system-on-chip (SoC) from STMicroelectronics that integrates a dual-core Arm Cortex-M4 and Cortex-M0+ processor with a sub-GHz radio supporting LoRa, (G)FSK, (G)MSK, and BPSK modulations. It operates from 150 MHz to 960 MHz and is designed for long-range, low-power IoT applications.

What is the operating frequency range of STM32WL55JCI6?

The STM32WL55JCI6 operates over a frequency range of 150 MHz to 960 MHz, covering major sub-GHz ISM bands including 433 MHz, 868 MHz, and 915 MHz. According to the STM32WL55JC datasheet, this allows deployment in various regions worldwide.

What is the maximum output power of STM32WL55JCI6?

The maximum output power of the STM32WL55JCI6 is +22 dBm, which enables long-range communication. At +14 dBm, the TX current is 87 mA, and at +22 dBm, it increases to approximately 118 mA, as per the datasheet.

What is the receiver sensitivity of STM32WL55JCI6?

The receiver sensitivity of the STM32WL55JCI6 is -137 dBm in LoRa mode, which allows reliable reception of weak signals over long distances. This high sensitivity is crucial for LPWAN applications.

What is the difference between STM32WL55JCI6 and STM32WL54JCI6?

The STM32WL55JCI6 has 256 KB flash and 64 KB SRAM, while the STM32WL54JCI6 has 256 KB flash and 64 KB SRAM as well, but the STM32WL55JCI6 includes additional security features like AES-256 and TRNG. Both share the same UFBGA-73 package and are pin-compatible.

Can STM32WL55JCI6 be used for LoRaWAN applications?

Yes, the STM32WL55JCI6 is fully LoRaWAN-compliant and supports Class A, B, and C devices. It integrates the LoRa radio and the protocol stack can be run on the Cortex-M0+ core, making it ideal for LoRaWAN end-devices.

What is the supply voltage range of STM32WL55JCI6?

The STM32WL55JCI6 operates from 1.8V to 3.6V, making it suitable for battery-powered applications. The internal regulators provide stable voltages to the core and radio.

What is the standby current of STM32WL55JCI6?

The standby current of the STM32WL55JCI6 is 1.62 uA with the RTC running, which is extremely low and extends battery life in duty-cycled IoT applications.

What development tools are compatible with STM32WL55JCI6?

The STM32WL55JCI6 is supported by STM32CubeWL, STM32CubeIDE, and various third-party tools like Keil MDK and IAR EWARM. The STM32CubeWL includes middleware for LoRaWAN and Sigfox stacks.

Is STM32WL55JCI6 RoHS compliant?

Yes, the STM32WL55JCI6 is RoHS compliant, as indicated in the datasheet and ST product page. It is also free of halogens and antimony.

What is the price of STM32WL55JCI6?

As of 2026-08-09, the price of STM32WL55JCI6 is approximately $12.50 for single-unit quantities, decreasing to $8.10 at 1000 units, based on distributor listings.

Where can I buy STM32WL55JCI6?

The STM32WL55JCI6 is available from major distributors such as DigiKey, Mouser, and Farnell. You can also purchase directly from STMicroelectronics' e-store.

What is the lead time for STM32WL55JCI6?

The lead time for STM32WL55JCI6 is typically 8-12 weeks from distributors, but it may vary based on stock levels. Check with your preferred distributor for current availability.

What is the best drop-in replacement for STM32WL55JCI6?

The best drop-in replacement for STM32WL55JCI6 is the STM32WL55JCI7, which is pin-compatible and offers the same features but with a different temperature grade. Other alternatives include STM32WL54JCI6 and STM32WL55CCU6, but verify pin compatibility.

Can STM32WL55JCI6 be replaced by STM32WL55CCU6?

The STM32WL55CCU6 is not a drop-in replacement because it uses a different package (UFQFPN-48) and has fewer pins. It is functionally similar but requires PCB redesign.

What are the key specifications of STM32WL55JCI6 that engineers should know?

Engineers should know that the STM32WL55JCI6 features a dual-core Arm Cortex-M4 (64 MHz) and Cortex-M0+ (48 MHz), 256 KB flash, 64 KB SRAM, a sub-GHz radio with LoRa support, output power up to +22 dBm, sensitivity down to -137 dBm, supply voltage 1.8V-3.6V, and standby current of 1.62 uA. It is packaged in UFBGA-73.

Hey Google, what can replace STM32WL55JCI6?

The STM32WL55JCI6 can be replaced by the STM32WL55JCI7 (same package, extended temperature range) or the STM32WL54JCI6 (same package, no security features). Cross-brand alternatives are limited, but the Semtech SX1262 is a radio-only alternative requiring an external MCU.

Is STM32WL55JCI6 the same as STM32WL55JCI7?

No, the STM32WL55JCI6 and STM32WL55JCI7 are not the same. The STM32WL55JCI7 has an extended temperature range (-40C to +105C) compared to the STM32WL55JCI6 (-40C to +85C), but they are pin-compatible and share the same package.

What is the best Semtech equivalent for STM32WL55JCI6?

There is no direct drop-in Semtech equivalent for the STM32WL55JCI6 because it integrates an MCU and radio. The Semtech SX1262 is a radio-only transceiver that requires an external MCU, so it is not a drop-in replacement.

What is the package of STM32WL55JCI6?

The STM32WL55JCI6 is packaged in a UFBGA-73 (7x7 mm) package, which is a fine-pitch ball grid array. This package is suitable for compact designs and offers good thermal performance.

What is the pinout of STM32WL55JCI6?

The pinout of STM32WL55JCI6 is detailed in the datasheet. Key pins include VDD, VSS, RFI (RF input), RFO (RF output), and various GPIOs. The UFBGA-73 package has 73 balls, with many pins multiplexed for multiple functions.

Engineering reference data for STM32WL55JCI6 — comparison, design guidance, and compliance information.

Selection Guide

Choose the STM32WL55JCI6 when you need a secure, long-range, low-power wireless MCU with integrated LoRa. It is ideal for battery-powered IoT devices requiring extended range and security. If you do not need security features, the STM32WL54JCI6 is a cost-reduced alternative with the same package. For extended temperature range (-40C to +105C), select the STM32WL55JCI7. If you require a smaller package, consider the STM32WL55CCU6 (UFQFPN-48), but note it is not pin-compatible. For applications needing only a radio, the Semtech SX1262 is an option but requires an external MCU.

Comparison with Alternatives

Parameter	This Product	STM32WL55JCI7	STM32WL54JCI6	STM32WL55CCU6
Package	UFBGA-73	UFBGA-73	UFBGA-73	UFQFPN-48
Brand	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Core	Cortex-M4 + M0+	Cortex-M4 + M0+	Cortex-M4 + M0+	Cortex-M4 + M0+
Flash Memory	256 KB	256 KB	256 KB	256 KB
SRAM	64 KB	64 KB	64 KB	64 KB
Max Output Power	+22 dBm	+22 dBm	+22 dBm	+22 dBm
Receiver Sensitivity	-137 dBm	-137 dBm	-137 dBm	-137 dBm
Security Features	AES-256, TRNG	AES-256, TRNG	None	AES-256, TRNG
Temperature Range	-40C to +85C	-40C to +105C	-40C to +85C	-40C to +85C

Key Differentiators

Integrated dual-core with dedicated radio core (vs Semtech SX1262)
Higher output power (+22 dBm) (vs STM32WL54JCI6)
Security features (AES-256, TRNG) (vs STM32WL54JCI6)

Design Notes

For optimal RF performance, match the antenna impedance to 50 ohms and place it as close to the RFI/RFO pins as possible. Use a balun and matching network as recommended in the STM32WL55JC application note (AN5405). Keep the RF trace short and avoid vias to minimize losses.

Decouple all VDD pins with 100 nF capacitors and add a 4.7 uF bulk capacitor. For the RF supply (VDD_RF), use a dedicated low-noise LDO or filter to avoid noise coupling into the radio. Ensure the supply voltage stays within 1.8V-3.6V during TX bursts.

The UFBGA-73 package has a thermal resistance of approximately 40 C/W (theta_JA). At maximum TX power (+22 dBm), the device may dissipate up to 0.5W, causing a temperature rise of 20C. Ensure adequate PCB copper area for heat dissipation, especially in high-temperature environments.

Follow the layout guidelines in AN5405 for the RF section. Keep the crystal oscillator components close to PH0/PH1 and avoid routing digital signals near the RF path. Use a solid ground plane and stitch vias around the RF area.

Do not exceed the absolute maximum ratings, especially on the RF pins. Ensure the antenna is properly matched to avoid damage to the PA. Also, be aware that the STM32WL55JCI6 does not have a built-in balun, so an external balun is required for single-ended antennas.