STM32L053R8T6 - 32MHz Ultra-Low-Power Cortex-M0+ MCU | ST
MPN: STM32L053R8T6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.61 | $3.61 |
| 10 | $3.24 | $32.40 |
| 100 | $2.85 | $285.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.1 | $2,100.00 |
STM32L053R8T6 Overview
What is an ultra-low-power microcontroller? It is an embedded processor optimized to minimize energy consumption while still providing enough compute for sensing, control, and communication tasks. It sits in the product hierarchy: microcontroller -> ARM Cortex-M0+ -> ultra-low-power MCU -> battery-powered embedded system. These devices rely on low-leakage process technology, flexible clock gating, and sleep/stop/standby modes to cut current draw to microamp or nanoamp levels, enabling multi-year operation from a coin cell.
Key features include a USB 2.0 full-speed crystal-less device controller, an LCD driver supporting up to 8x28 segments, a 12-bit ADC with hardware oversampling, a 12-bit DAC, two ultra-low-power comparators, and a real-time clock with calendar. The STM32L053R8T6 runs from a 1.8 V to 3.6 V supply (down to 1.65 V in power-down without BOR), operates from -40C to +125C, and provides I2C, SPI, and USART serial interfaces.
Technically, this MCU is built in a 110 nm ultra-low-leakage process. It integrates an NVIC, a memory protection unit, a true random number generator, a CRC calculation unit, and a unique 96-bit device ID. Typical Run-mode consumption is 84 uA/MHz, while Standby with RTC is only 0.29 uA. The flexible clock tree accepts an internal 16 MHz RC, an external crystal, or a 32.768 kHz oscillator for low-power RTC timekeeping.
Typical applications include portable medical devices, wireless IoT sensor nodes, smart utility meters, wearable devices, and LCD-equipped industrial products. The very low standby current and configurable wake-up events make this MCU ideal for systems that must spend most of their life asleep and wake periodically to sample, log, or transmit.
When designing with this device, place a 100 nF decoupling capacitor near each VDD pin and a 1 uF bulk capacitor on the main supply. Configure the RTC, EXTI, or USART wake-up sources to keep average current in the microamp range while preserving responsiveness.
This page synthesizes distributor availability, drop-in STM32L0 alternatives, comparison data, and practical low-power design notes that are not reprinted in the datasheet, helping engineers select and validate the part faster.
Drop-in alternatives for STM32L053R8T6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32L053R8T6 (same form factor and footprint) — differing in Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32L052R8T6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L073RBT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L072RBT6
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.88 / Unit
View Datasheet →STM32L071RBT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L051R8T6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L053R8T6 Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0+ |
| Core Architecture | 32-bit |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory Size | 64 KB (64K x 8) |
| SRAM Size | 8 KB |
| Supply Voltage Range | 1.8 V to 3.6 V (BOR enabled; down to 1.65 V in power-down without BOR) |
| Operating Temperature Range | -40 C to +125 C |
| Package / Case | 64-LQFP (10x10 mm) |
| Number of Pins | 64 |
| Mounting Type | Surface Mount |
| USB Controller | USB 2.0 full-speed crystal-less device |
| ADC | 12-bit with hardware oversampling up to 16-bit resolution |
| DAC | 12-bit |
| Comparators | 2 ultra-low-power comparators |
| LCD Driver | Up to 8x28 segments |
| Communication Interfaces | I2C, SPI, USART |
| Run Mode Current | 84 uA/MHz (typical) |
| Standby Current with RTC | 0.29 uA (typical) |
| RoHS | Compliant |
STM32L053R8T6 64-lqfp (10x10 mm) Pin Configuration Guide
Pin configuration for STM32L053R8T6 (64-lqfp (10x10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32L053R8T6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32L053R8T6 is suitable for 6 applications: IoT Sensor Node, Portable Medical Device, Smart Utility Metering, Wearable Electronics, Industrial Sensor / Data Logger, LCD-Equipped Product Controls.
IoT Sensor Node
Smart agriculture, building automation, and environmental monitors need an MCU that wakes periodically, reads sensors, and sleeps. The STM32L053R8T6 draws 84 uA/MHz in Run mode and only 0.29 uA in Standby with RTC, so a 1000 mAh Li-ion or two AA cells can power years of once-a-minute readings. Its 12-bit ADC with oversampling gives stable sensor conversion, while I2C/SPI/USART connect to temperature, humidity, or gas sensors and to a LoRa or BLE radio. The crystal-less USB port is useful for local data download or firmware updates. Use the RTC alarm or EXTI to wake the core while keeping the rest of the device in Stop mode. A wake-up-to-data-radio duty cycle of less than 1 percent keeps average current below 10 uA.
Recommended
Portable Medical Device
Pulse oximeters, glucose monitors, and wearable health patches must be safe, small, and low-power. The STM32L053R8T6 supports 1.8 V to 3.6 V operation, allowing direct battery connection without an extra regulator in many designs. Its 12-bit ADC reads analog front-ends or photodiode amplifiers; its two comparators can detect thresholds. The device's RTC maintains time during sleep. Certifications often require an MCU with reliable brown-out reset, which the BOR on the L053 provides. The low Run-mode current and low leakage enable weeks of use from a tiny Li-ion cell. Designers can wake on timer or GPIO, process a sample, update an OLED or segment LCD, then return to Stop mode. The integrated USB is handy for clinical data export and firmware updates.
Recommended
Smart Utility Metering
Utility meters spend most of their time asleep and wake to measure voltage, current, or flow and stream data over wireless MBus, LoRa, or pulse outputs. The STM32L053R8T6's ultra-low standby current and 84 uA/MHz Run current help meet strict average-power budgets for battery-operated gas and water meters. The LCD driver up to 8x28 segments directly drives the meter display without a separate LCD driver IC, reducing BOM cost. The 12-bit ADC with oversampling reads current-sense transformers or shunt amplifiers; the RTC with calendar maintains billing time. The device's wide temperature range of -40C to +125C suits outdoor enclosure environments. Use the internal low-speed oscillator while in Stop mode, wake periodically to compute totalization, update the display, and transmit via an RF module.
Recommended
Wearable Electronics
Activity trackers, smart badges, and health rings require a microcontroller with a small 64-pin footprint yet enough I/O for sensors, display, and haptics. STM32L053R8T6's ultra-low-power modes let it run continuously from a coin cell for months. Its 12-bit ADC and comparators condition sensor signals; its I2C/SPI interfaces communicate with accelerometers, PPG sensors, and BLE modules. The LQFP-64 package and 10x10 mm body still leave board space for sensors. When the device is idle, entering Standby with RTC brings current to 0.29 uA. Wake-up events can be a timer, external pin, or comparator. The USB interface enables charging and quick firmware updates through a USB cable. Consider using Stop mode with only RTC and GPIO interrupts running to maximize battery life.
Recommended
Industrial Sensor / Data Logger
Industrial condition-monitoring sensors, data loggers, and predictive-maintenance nodes need reliable operation from -40C to +125C and predictable power consumption. The STM32L053R8T6 can directly capture analog signals from thermocouples, strain gauges, or 4-20 mA loop front-ends with its 12-bit ADC; hardware oversampling helps reduce noise. Configurable comparators allow fast threshold alarms without waking the CPU. Multiple USART, I2C, and SPI ports connect to industrial transceivers, external Flash, or RS-485 bridges. The MCU's brown-out reset and wide supply range make it robust in noisy plant environments. Engineers should disable unused peripherals and select the 32.768 kHz oscillator for RTC time-stamping, allowing the device to log events with very low average current for long battery-backed deployments.
Recommended
LCD-Equipped Product Controls
Thermostats, kitchen appliances, and laboratory instruments often require a local segment LCD plus USB connectivity for setup. The STM32L053R8T6 integrates an LCD driver that supports up to 8x28 segments, eliminating an external HT1621 or similar driver. This not only reduces component count but also simplifies firmware. The display can remain on in low-power mode as long as the LCD bias is sourced; with LCD enabled but CPU stopped, the current is very low. The same MCU provides USB 2.0 full-speed device for PC connection, plus enough GPIO for membrane keypads and LEDs. Because the R8 variant is in a 64-pin LQFP, it has more I/O than smaller LQFP48 versions. It is an excellent single-chip controller for cost-sensitive, mains- or battery-powered products that need a readable display.
Recommended
Recommended Products Summary
Engineering reference data for STM32L053R8T6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L052R8T6 | STM32L073RBT6 | STM32L072RBT6 | STM32L071RBT6 | STM32L051R8T6 |
|---|---|---|---|---|---|---|
| Package | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core / Max Frequency | ARM Cortex-M0+ / 32 MHz | ARM Cortex-M0+ / 32 MHz | ARM Cortex-M0+ / 32 MHz | ARM Cortex-M0+ / 32 MHz | ARM Cortex-M0+ / 32 MHz | ARM Cortex-M0+ / 32 MHz |
| Flash Memory | 64 KB | 64 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 20 KB | 20 KB | 20 KB | 8 KB |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| USB Controller | Yes (full-speed crystal-less) | Yes | Yes | Yes | No | No |
| LCD Driver | Yes, up to 8x28 segments | No | Yes | No | No | No |
Key Differentiators
- Integrated crystal-less USB 2.0 full-speed device plus LCD segment driver in one MCU (vs STM32L051R8T6)
- Ultra-low-power operation with 84 uA/MHz Run and 0.29 uA Standby with RTC (vs STM32L071RBT6)
- 64-pin LQFP with 64 KB Flash / 8 KB SRAM gives a balanced I/O and cost point (vs STM32L073RBT6)
Design Notes
Estimated: For a battery-powered sensor waking once per minute and running 10 ms at 32 MHz, average consumption is dominated by standby. At 84 uA/MHz during run and 0.29 uA standby with RTC, energy for one wake is roughly 84 uA x 32 x 10 ms = 26.9 uAs, plus 0.29 uA x 60 s = 17.4 uAs standby, yielding about 0.74 uAh per minute or 18 uAh/day. These are estimates from datasheet current figures; actual values depend on peripheral and GPIO leakage. Use Stop mode whenever possible and wake only on RTC or EXTI to keep average current in the single-digit microamp range.
Place a 100 nF ceramic capacitor as close as possible to each VDD/VSS pin pair, and add a 1 uF to 4.7 uF bulk capacitor on the main 3.3 V or 1.8 V supply. For the VDDA pin, use an additional low-ESR 1 uF capacitor plus a 10 nF high-frequency bypass. Keep the analog ground and digital ground on a single solid ground plane unless the datasheet advises otherwise. Route the 32.768 kHz crystal traces short and guard them with ground copper to avoid RTC clock noise.
Do not attempt to use USB and LCD simultaneously if the chosen package cannot provide the required pins, and verify the actual pin function map in the STM32L053x6/8 datasheet before layout. The USB port is crystal-less, but still needs proper 22 ohm series resistors on DP/DM in many designs. When migrating to STM32L073RBT6 or STM32L072RBT6, update linker memory sizes and check peripheral mapping because register differences may affect HAL code. Provide a clean reset circuit and brown-out reset enabled for production systems.
Compliance Information
PartGenie lists the STM32L053R8T6 as RoHS Compliant. REACH and MSL are not specified in the provided data. No AEC-Q100 evidence was found in the collected sources.
