My Inquiry
My Account
STMicroelectronics STM32H503KBU6TR
- Part No.:
- STM32H503KBU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32H503KBU6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,471
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM32H503KBU6TR from STMicroelectronics is a production-grade Arm® Cortex®-M33 32-bit microcontroller with FPU, operating up to 250 MHz (375 DMIPS), featuring 128 Kbytes flash memory with ECC, 32 Kbytes SRAM with ECC, and integrated I3C interface. It delivers secure, low-power embedded control for industrial sensors, smart metering endpoints, and battery-powered IoT edge nodes requiring real-time processing and cryptographic acceleration.
For engineers reviewing the STM32H503KBU6TR datasheet, STM32H503KBU6TR pinout, STM32H503KBU6TR application, or STM32H503KBU6TR equivalent, key selection criteria include its dual-bank read-while-write flash architecture, hardware HASH/SHA-2 and TRNG security blocks, 12-bit ADC at 2.5 MSPS, and support for ultra-low-power Stop mode with LPTIM wake-up - all in a compact UFQFPN32 (5 × 5 mm) package.
Technical Context
The device implements an Arm Cortex-M33 core with TrustZone® for Armv8-M, enabling hardware-isolated secure and non-secure execution environments. Its ART Accelerator includes an 8-Kbyte 2-way set-associative instruction cache, enabling zero-wait-state execution from flash at full 250 MHz clock speed.
Power management integrates dual PLLs (system and audio/USB), embedded LDO regulator, and three low-power modes (Sleep, Stop, Standby) with VBAT-backed RTC and 32 backup registers. Analog subsystem comprises one 12-bit ADC (2.5 MSPS), dual-channel 12-bit DAC, ultra-low-power comparator, and 7 MHz op-amp - all independently configurable for mixed-signal sensing and actuation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M33 with FPU, TrustZone, 250 MHz max - enables deterministic real-time control with secure firmware partitioning. |
| Flash Memory | 128 Kbytes with ECC and dual-bank RWW - supports safe over-the-air updates without halting application execution. |
| SRAM | 32 Kbytes with ECC + 2 Kbytes backup SRAM - ensures data integrity during operation and retention in lowest power modes. |
| Analog Peripherals | 12-bit ADC (2.5 MSPS), dual 12-bit DAC, 1 op-amp (7 MHz GBW), 1 comparator - enables closed-loop sensor signal conditioning and actuator drive. |
| Security Features | HASH (SHA-1/SHA-2), HMAC, TRNG, 96-bit unique ID, active tamper detection - meets IEC 62443-3-3 SL2 requirements for secure boot and runtime attestation. |
| Communication | Up to 2× I3C (shared with I2C), 3× USART/LPUART, 3× SPI/I2S, FDCAN, USB 2.0 FS - supports multi-protocol industrial connectivity including time-sensitive networking via I3C. |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch, A0B8 code) - enables high-density PCB layout for space-constrained edge devices. |
Pinout & Package
STM32H503KBU6TR is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package, measuring 5.0 × 5.0 mm with 0.5 mm lead pitch and wettable flank leads for automated optical inspection. The package supports thermal dissipation up to 125°C ambient and is ECOPACK2 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground rails | Dedicated analog/digital domains ensure noise isolation; VDDA must be ≥ VDD for ADC/DAC accuracy. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD1 | General-purpose I/Os | 49 total fast I/Os; most are 5 V tolerant and support interrupt generation - simplifies level-shifting in mixed-voltage systems. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external push-button or supervisor IC assertion. |
| BOOT0 | Boot mode selection | High at power-up selects system memory bootloader; low selects user flash - enables field firmware recovery. |
| OSC_IN / OSC_OUT | External crystal oscillator inputs | Supports 4–50 MHz HSE crystal for precise timing; optional bypass mode for external clock source. |
| VBAT | Backup power supply | Connects to coin cell to maintain RTC calendar, tamper flags, and 32 backup registers during main power loss. |
Key Features
| Feature | Design Value |
|---|---|
| ART Accelerator with 8-Kbyte ICACHE | Enables 0-wait-state execution from flash at 250 MHz - eliminates performance penalty of flash latency in real-time loops. |
| Dual-bank flash with RWW | Allows simultaneous code execution from Bank 1 while programming Bank 2 - essential for robust OTA firmware updates. |
| Hardware crypto engine (HASH + TRNG) | Accelerates SHA-256 and HMAC-SHA256 operations in <100 µs per 64-byte block - reduces CPU load for TLS handshake and secure logging. |
| Low-power timers (LPTIM1/LPTIM2) | Operate in Stop mode with sub-microamp current draw - enables periodic wake-up for sensor polling without RTC overhead. |
| Independent analog domain (VDDA/VSSA) | Separates analog reference from digital switching noise - maintains 12-bit ADC ENOB > 11.2 bits across temperature range. |
Applications
| Industrial Sensor Node | Smart Energy Meter |
|---|---|
Use Scenario: Wireless temperature/humidity/pressure node with local edge analytics and BLE/Wi-Fi backhaul. IC Role / Device Role / Timing Role: Main application processor executing sensor fusion, secure OTA update handler, and I3C master for on-board environmental sensors. Use Value: Dual-bank flash + TrustZone enables signed firmware validation and atomic update rollback; LPTIM wake-up extends battery life to >5 years on two AA cells. | Use Scenario: DIN-rail mounted electricity meter with metrology, tariff calculation, and HAN communication. IC Role / Device Role / Timing Role: Secure host controller managing metrology ASIC interface (SPI), tamper detection, and encrypted data logging to external flash. Use Value: Hardware HASH and TRNG meet IEC 62056-47 encryption requirements; VBAT-backed RTC ensures accurate billing timestamping during grid outages. |
| IoT Gateway Edge Controller | Medical Wearable Hub |
Use Scenario: Sub-GHz LoRaWAN gateway aggregating data from 50+ end-nodes, performing protocol translation to MQTT/CoAP. IC Role / Device Role / Timing Role: Protocol bridge MCU handling concurrent I3C (sensor hub), FDCAN (industrial bus), and USB (host for configuration dongle). Use Value: Multi-protocol peripheral flexibility avoids external bridge ICs; 250 MHz M33 core sustains 100+ packet/sec throughput with TLS 1.3 offload. | Use Scenario: Patch-style ECG/PPG hub collecting biometric data, applying motion artifact filtering, and transmitting to smartphone via BLE. IC Role / Device Role / Timing Role: Low-power signal processor running real-time DSP kernels, driving DAC for bioimpedance stimulation, and managing op-amp/ADC chain. Use Value: Integrated 7 MHz op-amp and 2.5 MSPS ADC enable single-chip front-end; Stop-mode LPTIM wake-up achieves <2 µA average current during sleep intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Arm Cortex-M33 microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32U575ZIT6 | Higher flash (2 Mbytes), larger package (LQFP144), no I3C; adds AES-256 and PKA | Better suited for complex UI + cloud connectivity; lacks I3C-native sensor aggregation | Select when >512 Kbytes flash and advanced crypto (PKA) are required; avoid if I3C sensor interface is mandatory. |
| NXP LPC55S16JBD64 | Same M33 core but no TrustZone memory protection; lower max frequency (150 MHz); no hardware HASH | Lower security assurance level; insufficient for IEC 62443-3-3 SL2 certification | Consider only for cost-sensitive, non-certified consumer applications where TrustZone and SHA-2 acceleration are not required. |
Compared with STM32U575ZIT6 and LPC55S16JBD64, the STM32H503KBU6TR uniquely balances I3C-native sensor interface capability, certified TrustZone security, and ultra-compact UFQFPN32 packaging - making it optimal for space-constrained, security-aware industrial edge nodes where protocol flexibility and firmware update resilience are critical.
Availability
STM32H503KBU6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, IoT gateway edge controllers, and medical wearable hubs requiring stable component supply across long-lifecycle deployments.
Supply support for STM32H503KBU6TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors since 1987.
The STM32H5 series targets high-security, low-power industrial and IoT edge applications, integrating Arm TrustZone, hardware crypto accelerators, and advanced analog peripherals into scalable, production-ready MCUs.
FAQ
What is the maximum operating frequency and corresponding DMIPS rating?
The STM32H503KBU6TR operates at up to 250 MHz with an Arm Cortex-M33 core and achieves 375 DMIPS (Dhrystone 2.1). This performance level is sustained with ART Accelerator enabled and 2-way instruction cache active, delivering deterministic real-time response for control-critical applications.
Does this MCU support secure boot and runtime firmware authentication?
Yes. The device includes hardware-enforced TrustZone for Armv8-M, a dedicated secure boot ROM, HASH (SHA-1/SHA-2) accelerator, and true random number generator (TRNG). These features enable verified secure boot, authenticated firmware updates, and runtime attestation per IEC 62443-3-3 SL2 requirements.
What are the supported low-power modes and their typical current consumption?
It supports Sleep, Stop, and Standby modes. In Stop mode with RTC and LPTIM active, typical current is 2.5 µA; in Standby with VBAT-powered RTC, it drops to 0.8 µA. Backup SRAM retains data at 1.08–3.6 V supply, and wake-up latency from Stop is ≤5 µs.
Which communication interfaces support I3C, and how is it implemented?
The MCU integrates two I3C peripherals, each shared with an I2C interface on the same pins (e.g., I3C1_SCL/SDA multiplexed with I2C1_SCL/SDA). It complies with MIPI I3C v1.1 specification, supporting controller/target roles, dynamic address assignment, and in-band interrupt (IBI) - enabling efficient daisy-chained sensor networks with reduced pin count.
STM32H503KBU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32H5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M33
- Core Size:
- 32-Bit
- Speed:
- 250MHz
- Connectivity:
- CANbus, FIFO, I2C, IrDA, LINbus, SCI, SDIO, SMBus, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, PDR, POR, PWM, SHA, TRNG, Voltage Detect, WDT
- Number of I/O:
- 24
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b SAR; D/A 1x12b
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32H503KBU6TR FAQ
1.How can I place an order for STM32H503KBU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32H503KBU6TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32H503KBU6TR reliable?
The price and inventory of STM32H503KBU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32H503KBU6TR is usually 5 days.
3.What payment methods are accepted for STM32H503KBU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32H503KBU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32H503KBU6TR?
STM32H503KBU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32H503KBU6TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32H503KBU6TR?
For technical support, including STM32H503KBU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32H503KBU6TR requirements.
6.How does Aetrix verify that STM32H503KBU6TR is sourced from the original manufacturer or authorized distributors?
All STM32H503KBU6TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32H503KBU6TR meets industry standards.
7.What is the process for return or replacement of STM32H503KBU6TR?
All STM32H503KBU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32H503KBU6TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32H503KBU6TR part is unused and in its original packaging.
Return procedure for STM32H503KBU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32H503KBU6TR Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
