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LM3S5732-IQR50-A0
Texas Instruments
IC MCU 32BIT 128KB FLASH 64LQFP
29288 Pcs New Original In Stock
ARM® Cortex®-M3 Stellaris® ARM® Cortex®-M3S 5000 Microcontroller IC 32-Bit Single-Core 50MHz 128KB (128K x 8) FLASH 64-LQFP (10x10)
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5.0 / 5.0
- (132 Ratings)
LM3S5732-IQR50-A0
Product Overview
1277617
DiGi Electronics Part Number
LM3S5732-IQR50-A0-DGManufacturer
Texas Instruments
LM3S5732-IQR50-A0
Description
IC MCU 32BIT 128KB FLASH 64LQFPInventory
29288 Pcs New Original In Stock
ARM® Cortex®-M3 Stellaris® ARM® Cortex®-M3S 5000 Microcontroller IC 32-Bit Single-Core 50MHz 128KB (128K x 8) FLASH 64-LQFP (10x10)
Quantity
Minimum 1
Minimum 1
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LM3S5732-IQR50-A0 Technical Specifications
Category
Embedded, Microcontrollers
Packaging
-
Series
Stellaris® ARM® Cortex®-M3S 5000
Product Status
Not For New Designs
DiGi-Electronics Programmable
Not Verified
Core Processor
ARM® Cortex®-M3
Core Size
32-Bit Single-Core
Speed
50MHz
Connectivity
CANbus, I2C, IrDA, Microwire, SPI, SSI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number of I/O
33
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
EEPROM Size
-
RAM Size
64K x 8
Voltage - Supply (Vcc/Vdd)
2.25V ~ 2.75V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
64-LQFP (10x10)
Package / Case
64-LQFP
Base Product Number
LM3S5732
Datasheet & Documents
Manufacturer Product Page
LM3S5732-IQR50-A0 Specifications
HTML Datasheet
LM3S5732-IQR50-A0-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
3A991A2
HTSUS
8542.31.0001
Additional Information
Other Names
-296-25370-DG
LM3S5732-IQR50
LM3S5732-IQR50-A0-DG
-LM3S5732-IQR50-A0-NDR
LM3S5732-IQR50-DG
2156-LM3S5732-IQR50-A0
-LM3S5732-IQR50
TEXTISLM3S5732-IQR50-A0
296-25370
Standard Package
160
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
디지 일렉트로닉스는 가격이 매우 투명하며 제품의 품질도 일정해서 더욱 믿음이 가네요.
de desembre 02, 2025
每次需要協助時，DiGi Electronics都能提供迅速且有效的支援，讓我很放心。
de desembre 02, 2025
Très bon service d’expédition, je suis impressionné par la rapidité et la qualité de l’emballage.
de desembre 02, 2025
Fast dispatch and attentive after-sales service make them stand out.
de desembre 02, 2025
The assistance I received was not only friendly but also very professional.
de desembre 02, 2025
Their unwavering quality and consistency help me feel confident in their brand.
de desembre 02, 2025
The support team is responsive, making problem-solving effortless.
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Frequently Asked Questions (FAQ)
Is the LM3S5732-IQR50-A0 suitable for replacing an older 8-bit microcontroller in an industrial sensor node requiring CAN and USB connectivity, and what are the key integration risks?
Yes, the LM3S5732-IQR50-A0 can serve as a drop-in performance upgrade from many 8-bit MCUs due to its integrated CAN and USB peripherals, 32-bit ARM Cortex-M3 core, and 50MHz speed. However, key integration risks include voltage compatibility—this device operates strictly at 2.25V to 2.75V, which may not be compatible with 3.3V or 5V legacy systems without level shifting. Additionally, its surface-mount 64-LQFP package and MSL-3 moisture sensitivity require careful PCB handling and reflow profiling. Ensure your firmware development environment supports StellarisWare or ARM toolchains, as legacy 8-bit code is not portable.
Can the LM3S5732-IQR50-A0 be used as a direct replacement for the STM32F103C8T6 in a motor control application, and what design changes would be necessary?
While both the LM3S5732-IQR50-A0 and STM32F103C8T6 are 32-bit ARM Cortex-M3 MCUs with similar clock speeds and peripheral sets, direct replacement is not recommended without significant redesign. The LM3S5732-IQR50-A0 has a narrower supply voltage range (2.25–2.75V vs. 2.0–3.6V for the STM32), fewer PWM channels, and no built-in op-amps or advanced timers found on the STM32. You would need to verify peripheral pin mapping, update firmware for TI’s Stellaris SDK, and possibly add external level translators or regulators. Also, note that the LM3S5732 is marked 'Not For New Designs,' making long-term availability a concern compared to the widely supported STM32F103.
What are the thermal and reliability implications of operating the LM3S5732-IQR50-A0 at its maximum ambient temperature of 85°C in an enclosed automotive under-hood application?
Operating the LM3S5732-IQR50-A0 at 85°C ambient is within its specified range, but sustained operation near this limit increases junction temperature, especially if the PCB lacks adequate thermal relief or airflow. In an enclosed automotive environment, thermal resistance from junction to ambient (θJA) can push the die temperature beyond safe margins, risking premature aging or functional failure. TI recommends derating and thermal simulation; consider adding a ground plane under the LQFP package and using thermal vias. Also, verify long-term reliability data—while the part is AEC-Q100 qualified variants exist, the LM3S5732-IQR50-A0 itself is not automotive-grade, so mission-critical applications should consider migration to a qualified alternative like the TM4C series.
How does the internal oscillator accuracy of the LM3S5732-IQR50-A0 impact timing-sensitive communication protocols like CAN or USB, and should I use an external crystal?
The LM3S5732-IQR50-A0 includes an internal RC oscillator, but its ±1% accuracy over temperature and voltage may not meet the tighter tolerances required for reliable CAN (typically ±0.5%) or full-speed USB (requires ±0.25% for SOF timing). For robust communication, especially in noisy or wide-temperature environments, TI recommends using an external 8–16 MHz crystal with appropriate load capacitors. This improves clock stability, reduces error rates, and ensures compliance with protocol timing budgets. Skipping the crystal may work in benign lab conditions but introduces field-failure risk in production systems.
Given that the LM3S5732-IQR50-A0 is marked 'Not For New Designs,' what are the recommended migration paths and long-term supply risks for existing designs?
The 'Not For New Designs' status indicates TI has deprecated the LM3S5732-IQR50-A0 in favor of newer Hercules or TM4C series MCUs. While current inventory (e.g., 29k+ units) suggests short-term availability, long-term supply is uncertain, posing obsolescence risk for products with 5–10 year lifecycles. Recommended migration paths include the TM4C123GH6PMI (also Cortex-M4F, pin-compatible in many cases, 3.3V operation, enhanced peripherals) or the more robust Hercules RM4 series for safety-critical apps. Before redesigning, conduct a full pinout, peripheral, and power comparison—and secure last-time buys if continuing with the LM3S5732-IQR50-A0. Always update BOMs to reflect lifecycle status to avoid future production halts.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM3S5732-IQR50-A0 CAD Models
Texas Instruments LM3S5732-IQR50-A0 PCB symbols & footprints
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