STM32L433RCI3 - 80MHz Cortex-M4F 256KB Flash 64KB SRAM | STMicroelectronics
MPN： STM32L433RCI3 ✓ 啟用中STM32L433RCI3 概覽
An ultra-low-power microcontroller is a type of embedded processor optimized for battery-operated and energy-harvesting systems. The STM32L4 family belongs to the hierarchy microcontroller -> embedded processor -> semiconductor, and adds ST's ultra-low-power design on top of the standard Arm Cortex-M4 core, enabling microamp-class standby current alongside 100 DMIPS of compute throughput.
Key features of the STM32L433RCI3 include 100 DMIPS performance at 80 MHz, 256 KB of Flash memory for firmware, and 64 KB of SRAM for working data and DMA buffers. The device includes a 12-bit ADC, comparators, a programmable timer array, real-time clock, and a flexible power-management architecture with an optional internal SMPS for analog rails. Multiple low-power modes (Stop, Standby, and Shutdown) support designs that must survive long idle periods on coin cells or energy-harvesting sources.
Technically, the part combines an Arm Cortex-M4F core (single precision FPU) with a 1.71 V minimum operating voltage for direct 1.8 V battery operation, low-power flash and SRAM retention options, and a peripheral set optimized for sensor-hub and metering designs. The integrated USB FS device and LCD controller reduce the external component count on connected HMI products, while the analog peripherals support direct sensor interfacing without external signal conditioning.
Typical applications include Bluetooth and Zigbee sensor-hub modules, connected industrial sensors, low-power data loggers, portable medical and wellness devices, smart meters, compact HMI panels with LCD, and USB-connected battery-powered instrumentation. Each of these designs benefits from the combination of 256 KB Flash, hardware FPU, and deep sleep current in the microamp range.
The key design consideration for this part is supply rail planning: the analog and digital sections share a 1.71 V to 3.6 V range, so decoupling and layout must respect the recommended input and output capacitor networks, and any LCD or USB termination must be sized for the 1.8 V minimum rail. Use the pin description table in the STMicroelectronics datasheet when assigning PCB tracks and keep high-current USB and LCD paths away from the ADC inputs.
This page combines manufacturer specifications with package-level guidance, drop-in same-family alternatives, and practical design notes covering power, layout and low-power design that are not covered by the raw datasheet parameter tables.
直接替換替代品，適用於 STM32L433RCI3 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： STM32L433RCI3 （相同外形與佔位） — 差異在於 Flash Memory, Package.
STM32L443RCI6
✅ 直接替換聯絡詢價
查看資料表 →STM32L452RCI6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L476RCI6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L431RCI6
✅ 直接替換聯絡詢價
查看資料表 →STM32L432RCI6
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
STM32L433RCI3 最大額定值與電氣特性
| Core | Arm Cortex-M4 with FPU, 32-bit |
| Maximum CPU Frequency | 80 MHz |
| Performance | 100 DMIPS |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| Supply Voltage Range | 1.71 V to 3.6 V (1.8 V / 2.5 V / 3.3 V rails) |
| USB | USB Full-Speed device controller |
| LCD Controller | Yes, segment/graphic LCD controller |
| Internal SMPS | Yes, external SMPS option in the feature set |
| ADC | 12-bit ADC |
| Comparators | Yes, integrated comparators |
| 封裝 | 64-UFBGA (5x5 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 C to +85 C (industrial grade) |
| Programmable Timers | Yes, multi-channel timer array |
| RTC | Yes, real-time clock with backup domain |
| Low-Power Modes | Sleep, Stop, Standby, Shutdown |
| RoHS 狀態 | Compliant (RoHS 2011/65/EU) |
STM32L433RCI3 64-ufbga (5x5 mm) 腳位配置指南
STM32L433RCI3（64-ufbga (5x5 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： STM32L433RCI3.
請參閱 資料表 以查看完整腳位配置。
典型應用
STM32L433RCI3 適用於 6 應用s: Bluetooth and Zigbee Sensor Hub Modules, Low-Power Industrial Sensor and Condition Monitoring, Portable Medical and Wellness Devices, Compact HMI Panels with LCD Display, USB-Connected Battery-Powered Instrumentation, Smart Metering and Utility Data Loggers.
Bluetooth and Zigbee Sensor Hub Modules
The STM32L433RCI3 fits sensor-hub designs where a radio module sits alongside a low-power MCU, because the 256 KB of Flash holds a radio stack plus application code while the 64 KB of SRAM absorbs protocol buffers. At 80 MHz with a hardware FPU the part can run local filtering or FFT work on accelerometer and gyroscope streams without waking a higher-power host. The 1.71 V minimum operating voltage allows direct operation from a single Li-ion cell or coin cell with a boost stage ahead of the radio, and Stop mode lets the module sleep between data bursts. The 64-UFBGA (5x5 mm) land pattern keeps the module footprint small enough for coin-cell and wearables enclosures.
推薦
Low-Power Industrial Sensor and Condition Monitoring
Industrial condition-monitoring nodes typically run from a 24 V loop or battery pack and must survive long idle periods, which is where the STM32L433RCI3 Stop and Shutdown modes and 1.71 V to 3.6 V supply range pay off. The integrated 12-bit ADC and comparators allow direct connection of bridge sensors, thermocouples through an amplifier, and digital lines, cutting out a separate analog front end. Its 100 DMIPS performance lets the node run filtering and threshold logic locally instead of streaming every sample upstream. The -40 C to +85 C industrial temperature rating of this ordering code suits equipment installed in factories, HVAC plenums and outdoor enclosures.
推薦
Portable Medical and Wellness Devices
Battery-powered wellness and diagnostic devices such as spirometers, patch monitors and handheld meters favor the STM32L433RCI3 because the 64-UFBGA (5x5 mm) package keeps the board area small while the 256 KB of Flash supports a rich application layer. The Cortex-M4F single-precision FPU accelerates the fixed-point and float filtering commonly used in signal-chain conditioning, and the USB Full-Speed device port allows direct enumeration as a USB-connected device from a single-cell battery supply. Low-power modes support multi-day or multi-week operation between charges. The LCD controller also enables a small local display without adding a separate display driver IC.
推薦
Compact HMI Panels with LCD Display
In a small handheld or panel-mounted human-machine interface, the STM32L433RCI3 removes the need for a separate LCD controller because the segment and graphic LCD interface is already integrated alongside the USB device port. The 80 MHz Cortex-M4F core with 256 KB of Flash is sufficient to render menus, update graphs and service a touch or rotary input alongside the display refresh. Because the 5x5 mm UFBGA package leaves board area for a larger LCD glass assembly, it suits compact industrial panels and handheld instruments. The 1.8 V rail operation option allows a display and logic to share a single low-voltage supply when the panel uses an external boost for backlight.
推薦
USB-Connected Battery-Powered Instrumentation
Portable oscilloscope probes, USB dongles and handheld meters benefit from the STM32L433RCI3 because the USB Full-Speed device controller removes an external bridge chip and the whole design can run from a single 1.8 V to 3.6 V rail. The 256 KB of Flash accommodates firmware, calibration tables and a USB stack, while the 64 KB of SRAM supports USB packet buffering and data processing. The 12-bit ADC and comparator resources support direct sensor and probe front ends. Stop mode lets the device remain enumerated on low energy between measurement bursts, which matters when the unit runs from USB bus power or a small internal battery.
推薦
Smart Metering and Utility Data Loggers
Smart meter and utility data logger designs run for years on primary batteries, making the STM32L433RCI3 an appropriate low-power controller with 256 KB of Flash for protocol stacks and secure storage. The Stop and Shutdown modes limit quiescent consumption between radio transmissions, and the wide 1.71 V to 3.6 V operating range tolerates primary cell chemistries with a regulator or boost front end. The integrated 12-bit ADC handles pulse-counting and analog sensing inputs, while the LCD controller can drive the local display found on many residential meters. The 64-UFBGA package and -40 C to +85 C rating also suit outdoor meter boxes.
推薦
推薦產品摘要
工程參考資料，適用於 STM32L433RCI3 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | STM32L443RCI6 | STM32L452RCI6 | STM32L476RCI6 | STM32L431RCI6 | STM32L432RCI6 |
|---|---|---|---|---|---|---|
| Package | 64-UFBGA (5x5 mm) | 64-UFBGA (5x5 mm) - same | 64-UFBGA (5x5 mm) - same | 64-UFBGA (5x5 mm) - same | 64-UFBGA (5x5 mm) - same | 64-UFBGA (5x5 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | Arm Cortex-M4F, 80 MHz | Arm Cortex-M4F, 80 MHz | Arm Cortex-M4F, 80 MHz | Arm Cortex-M4F, 80 MHz | Arm Cortex-M4F, 80 MHz | Arm Cortex-M4F, 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB (-50%) | 128 KB (-50%) |
| SRAM | 64 KB | 64 KB | 160 KB | 128 KB | 64 KB | 64 KB |
| USB Full-Speed Device | Yes | Yes | Yes | Yes | Yes | No |
| LCD Controller | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage Range | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V |
| Ordering Temperature Code | I3 (-40 C to +85 C) | I6 | I6 | I6 | I6 | I6 |
主要差異化特點
- Balanced memory and peripheral set in a 5x5 mm BGA (對比STM32L431RCI6)
- USB Full-Speed device plus LCD controller on one die (對比STM32L432RCI6)
- More headroom in SRAM for protocol and DMA buffering (對比STM32L443RCI6)
設計說明
The STM32L433RCI3 accepts a 1.71 V to 3.6 V supply, so a single 1.8 V, 2.5 V or 3.3 V rail can feed the core directly, but the internal core voltage still needs regulation. Place the recommended input and output decoupling capacitors at the VDD and VCAP balls with the shortest possible traces, and keep the VCAP capacitor connection free of any routing or vias that share with ADC input nets. For battery designs, size the bulk capacitor to hold the rail through the highest current draw of the ADC and USB transmit bursts.
In a 64-UFBGA (5x5 mm) land pattern, ball pitch is tight and escape routing is difficult, so plan the escape for the power, ground, USB and LCD signals before placing peripherals. Follow the STMicroelectronics recommended PCB layout guidance in the STM32L433xx datasheet for via-in-pad usage and fanout, keep the USB differential pair routed over a continuous ground plane with no plane splits, and route the LCD and segment outputs away from the 12-bit ADC input balls to avoid coupling display drive edges into analog measurements.
Two common mistakes occur when moving between STM32L4 order codes. First, the temperature-grade suffix differs between I3 and I6 variants, so a substitution can change the qualified temperature range. Second, the boot pin configuration differs between some L4 family members, and a board designed for a fixed BOOT0 strap may not enter the intended boot mode after a swap. Verify the boot configuration, the option-byte defaults, and the peripheral set of any substitute part on the production test bench before releasing a build.
合規資訊
The STM32L433 family documentation carries RoHS 2011/65/EU declarations and the device is supplied in lead-free packages. This ordering code is the industrial temperature grade, so it is not AEC-Q100 automotive qualified; use the automotive STM32L4 part numbers for vehicle applications.
