SCF5250AG120 Equivalent & Substitute Parts

Part Overview

The SCF5250AG120 is a 32-bit single-core Coldfire V2 microcontroller manufactured by NXP USA Inc., operating at 120MHz with ROMless architecture and 128K x 8 RAM. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, redesigns, and production continuity. The part operates within a 1.08V to 1.32V supply range and integrates multiple connectivity interfaces including EBI/EMI, I2C, IDE, Memory Card, SPI, and UART/USART protocols.

Key Parameters

Parameter	SCF5250AG120
Core Processor Architecture	Coldfire V2
Core Size	32-Bit Single-Core
Operating Frequency	120MHz
Program Memory Type	ROMless
RAM Size	128K x 8
Supply Voltage Range	1.08V – 1.32V
Number of I/O Pins	57
Package Type	144-LQFP (20x20)
Data Converters	A/D 6x12-bit
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SCF5250AG120 is determined by the following critical parameters:

Core Architecture & Bit Width: 32-bit single-core processor capability
Memory Configuration: ROMless architecture with external program memory support
Operating Frequency: Minimum 120MHz performance requirement
RAM Capacity: Minimum 128K x 8 or equivalent addressable RAM
I/O Count: Minimum 56 I/O pins to maintain system connectivity
Package Compatibility: Surface-mount LQFP package with comparable pin density
Supply Voltage: Compatibility within industrial or embedded system voltage ranges
Peripheral Integration: Support for core connectivity protocols (I2C, SPI, UART/USART, DMA)

The TMS320R2811PBKA qualifies as a manufacturer-recommended substitute based on these parameters. While architectural differences exist between Coldfire V2 and C28x processors, both devices meet the functional requirements for 32-bit ROMless microcontroller applications with comparable I/O capacity and peripheral feature sets.

Parameter Comparison

Parameter	SCF5250AG120	TMS320R2811PBKA	Compatibility Notes
Core Size	32-Bit Single-Core	32-Bit Single-Core	Matched
Operating Frequency	120MHz	150MHz	Substitute exceeds minimum requirement
Program Memory Type	ROMless	ROMless	Matched
RAM Size	128K x 8	20K x 16	Different capacity; verify application requirements
Number of I/O	57	56	Comparable; one pin difference
Package Type	144-LQFP (20x20)	128-LQFP (14x14)	Different package; PCB redesign required
Data Converters	A/D 6x12-bit	A/D 16x12-bit	Substitute provides enhanced ADC capability
Mounting Type	Surface Mount	Surface Mount	Matched
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	Matched
Product Status	Obsolete	Active	Substitute offers long-term availability

Engineering Selection Recommendations

Selection of the TMS320R2811PBKA as a substitute for the SCF5250AG120 is supported by the following factors:

Compliance & Availability: The TMS320R2811PBKA maintains ROHS3 compliance and holds active product status, ensuring regulatory alignment and sustained supply chain availability compared to the obsolete SCF5250AG120.

Performance Headroom: The substitute operates at 150MHz versus the original 120MHz, providing performance margin for system requirements without degradation.

Peripheral Feature Parity: Both devices integrate DMA, POR, and WDT functionality. The substitute adds PWM and CANbus capabilities, expanding system integration options.

Critical Design Considerations: The substitute employs a 128-LQFP (14x14) package versus the original 144-LQFP (20x20), necessitating PCB layout redesign. RAM capacity differs (20K x 16 versus 128K x 8); applications requiring the full 128K address space must evaluate external memory expansion feasibility. The substitute's automotive-grade qualification (AEC-Q100) supports applications requiring automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the TMS320R2811PBKA directly replace the SCF5250AG120 without PCB modification?

A: No. The substitute uses a 128-LQFP (14x14) package compared to the original 144-LQFP (20x20). PCB footprint redesign is required. Pin-to-pin compatibility does not exist due to different package geometries and pin assignments.

Q: What is the RAM capacity difference, and does it affect substitution?

A: The SCF5250AG120 provides 128K x 8 RAM, while the TMS320R2811PBKA provides 20K x 16 RAM. Applications relying on the full 128K address space must implement external memory solutions or evaluate firmware modifications to operate within the reduced internal RAM capacity.

Q: Are the processor architectures compatible from a software perspective?

A: No. The SCF5250AG120 uses Coldfire V2 architecture, while the TMS320R2811PBKA uses C28x fixed-point architecture. Firmware recompilation and potential algorithmic adaptation are required. Instruction sets and compiler toolchains differ between architectures.

Q: Does the substitute support the same connectivity protocols?

A: Both devices support I2C, SPI, and UART/USART. The substitute adds CANbus and McBSP, while the original includes IDE and Memory Card interfaces. Protocol compatibility depends on application-specific requirements.

Q: What is the voltage supply difference?

A: The SCF5250AG120 operates at 1.08V–1.32V, while the TMS320R2811PBKA operates at 1.81V–2V. Power supply redesign is necessary to accommodate the higher voltage requirement of the substitute.

Q: Is the substitute suitable for industrial temperature range applications?

A: The SCF5250AG120 operates at –20°C to 70°C, while the TMS320R2811PBKA operates at –40°C to 85°C. The substitute provides extended temperature coverage, supporting broader industrial and automotive applications.

Q: What certifications does the substitute carry?

A: The TMS320R2811PBKA holds AEC-Q100 automotive qualification and ROHS3 compliance. The original SCF5250AG120 is ROHS3 compliant but carries no automotive qualification.

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