TM4C1237D5PMIR Equivalent & Substitute Parts

Part Overview

The TM4C1237D5PMIR is an ARM Cortex-M4F Tiva C Series 32-bit microcontroller manufactured by Texas Instruments. This device integrates 64KB of FLASH program memory, 24KB of RAM, and 2KB of EEPROM in a 64-LQFP surface mount package. The microcontroller operates at 80MHz and supports multiple communication interfaces including CANbus, I2C, SPI, UART/USART, and USB OTG. The TM4C1237D5PMIR is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Core Processor	ARM Cortex-M4F
Core Size	32-Bit Single-Core
Speed	80MHz
Program Memory Size	64KB (64K x 8)
Program Memory Type	FLASH
RAM Size	24K x 8
EEPROM Size	2K x 8
Number of I/O	43
Voltage Supply (Vcc/Vdd)	1.08V ~ 3.63V
Data Converters	A/D 12x12b
Package / Case	64-LQFP (10x10)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the TM4C1237D5PMIR are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Core Compatibility Parameters:

Manufacturer: Texas Instruments
Core Processor: ARM Cortex-M4F
Core Size: 32-Bit Single-Core
Speed: 80MHz
Package / Case: 64-LQFP (10x10)
Mounting Type: Surface Mount
Voltage Supply Range: 1.08V ~ 3.63V
Operating Temperature: -40°C ~ 85°C (TA)

Memory Considerations: Substitutes may vary in program memory size (FLASH), RAM capacity, and EEPROM size while maintaining the same core architecture and pin configuration. Designs utilizing the full 64KB FLASH capacity of the TM4C1237D5PMIR require substitutes with equal or greater FLASH memory.

Connectivity & Peripherals: All substitute parts maintain the same core communication interfaces (CANbus, I2C, SPI, UART/USART, USB OTG) and essential peripherals (Brown-out Detect/Reset, DMA, POR, WDT).

Parameter Comparison

Parameter	TM4C1237D5PMIR	TM4C1237D5PMI7R	TM4C123BH6PMIR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Series	Tiva C	Tiva C	Tiva C
Core Processor	ARM Cortex-M4F	ARM Cortex-M4F	ARM Cortex-M4F
Core Size	32-Bit Single-Core	32-Bit Single-Core	32-Bit Single-Core
Speed	80MHz	80MHz	80MHz
Program Memory Size	64KB (64K x 8)	64KB (64K x 8)	256KB (256K x 8)
Program Memory Type	FLASH	FLASH	FLASH
RAM Size	24K x 8	24K x 8	32K x 8
EEPROM Size	2K x 8	2K x 8	2K x 8
Number of I/O	43	43	43
Voltage Supply (Vcc/Vdd)	1.08V ~ 3.63V	1.08V ~ 3.63V	1.08V ~ 3.63V
Data Converters	A/D 12x12b	A/D 12x12b	A/D 12x12b
Oscillator Type	Internal	Internal	Internal
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	64-LQFP (10x10)	64-LQFP (10x10)	64-LQFP (10x10)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Last Time Buy	Active	Active

Engineering Selection Recommendations

TM4C1237D5PMI7R is a direct equivalent to the TM4C1237D5PMIR with identical electrical and mechanical specifications. This part is currently in Active product status, providing superior long-term availability compared to the Last Time Buy status of the main part. The TM4C1237D5PMI7R maintains 64KB FLASH memory, 24KB RAM, and all connectivity features of the original device. Selection of this part is appropriate for designs requiring direct pin-for-pin and functional compatibility with no memory expansion requirements.

TM4C123BH6PMIR is a manufacturer-recommended substitute offering enhanced memory capacity. This device provides 256KB FLASH memory and 32KB RAM compared to the 64KB FLASH and 24KB RAM of the TM4C1237D5PMIR. The TM4C123BH6PMIR maintains identical core processor architecture, speed, pin count, package dimensions, and voltage specifications. This part is currently in Active product status. Selection of this part is appropriate for designs requiring additional program memory headroom or expanded RAM capacity while maintaining full pin compatibility and the same 64-LQFP package footprint.

Both substitute parts maintain ROHS3 compliance and identical moisture sensitivity levels, ensuring compatibility with existing manufacturing and storage processes.

Frequently Asked Questions (FAQ)

Q: Can TM4C1237D5PMI7R be used as a direct replacement for TM4C1237D5PMIR?

A: Yes. The TM4C1237D5PMI7R is electrically and mechanically identical to the TM4C1237D5PMIR. Both devices feature the same ARM Cortex-M4F core, 80MHz speed, 64KB FLASH, 24KB RAM, 43 I/O pins, and 64-LQFP package. The primary difference is product status: TM4C1237D5PMI7R is Active while TM4C1237D5PMIR is Last Time Buy.

Q: What are the differences between TM4C1237D5PMIR and TM4C123BH6PMIR?

A: Both devices share the same ARM Cortex-M4F core, 80MHz speed, 43 I/O pins, and 64-LQFP package. The TM4C123BH6PMIR provides 256KB FLASH memory and 32KB RAM compared to 64KB FLASH and 24KB RAM in the TM4C1237D5PMIR. The TM4C123BH6PMIR also includes QEI connectivity and Motion PWM peripherals not present in the TM4C1237D5PMIR.

Q: Is the TM4C123BH6PMIR pin-compatible with TM4C1237D5PMIR?

A: Yes. Both devices use the 64-LQFP (10x10) package with 43 I/O pins. Pin assignments are compatible, allowing the TM4C123BH6PMIR to function as a drop-in replacement from a physical and electrical standpoint.

Q: Can firmware developed for TM4C1237D5PMIR run on TM4C123BH6PMIR without modification?

A: Firmware compatibility depends on memory utilization. Code designed for 64KB FLASH will execute on the TM4C123BH6PMIR without modification. However, code utilizing the full 64KB FLASH capacity of the TM4C1237D5PMIR may require recompilation to take advantage of the expanded 256KB FLASH memory available on the TM4C123BH6PMIR.

Q: Are all three parts RoHS compliant?

A: Yes. TM4C1237D5PMIR, TM4C1237D5PMI7R, and TM4C123BH6PMIR are all ROHS3 compliant with Moisture Sensitivity Level 3 (168 Hours).

Q: Which substitute part should be selected for new designs?

A: For new designs requiring identical specifications to the TM4C1237D5PMIR, select TM4C1237D5PMI7R due to its Active product status. For designs that benefit from expanded memory capacity, select TM4C123BH6PMIR, which provides 4x FLASH memory and 33% additional RAM while maintaining full pin compatibility.

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