AT89C51CC03U-RLRIM Equivalent & Substitute Parts

Part Overview

The AT89C51CC03U-RLRIM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 64KB FLASH program memory, 2.25KB RAM, and integrated CAN bus connectivity. The device operates at 40MHz with a supply voltage range of 3V to 5.5V and is housed in a 44-VQFP package. This part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Core Processor	80C51
Core Size	8-Bit
Speed	40MHz
Program Memory Size	64KB (64K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	2.25K x 8
Voltage Supply (Vcc/Vdd)	3V ~ 5.5V
Data Converters	A/D 8x10b
Number of I/O	36
Connectivity	CANbus, UART/USART
Peripherals	POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package	44-VQFP (10x10)

Substitute Part Grouping Explanation

Substitution of the AT89C51CC03U-RLRIM is determined by equivalence across the following critical parameters:

Core processor architecture (80C51)
Memory configuration (64KB FLASH, 2.25KB RAM, 2KB EEPROM)
Operating speed (40MHz)
Supply voltage range (3V ~ 5.5V)
Peripheral feature set (CANbus, UART/USART, POR, PWM, WDT)
I/O count (36 pins)
Data converter specifications (A/D 8x10b)
Operating temperature range (-40°C ~ 85°C)

The AT89C51CC03UA-RDTUM qualifies as a direct substitute based on identical core specifications, memory configuration, speed, voltage range, and peripheral functionality. Differences in package format (64-LQFP versus 44-VQFP) and product status (Active versus Obsolete) do not affect functional equivalence when PCB layout accommodates the alternative package.

Parameter Comparison

Parameter	AT89C51CC03U-RLRIM	AT89C51CC03UA-RDTUM	Equivalence
Manufacturer	Microchip Technology	Microchip Technology	Identical
Core Processor	80C51	80C51	Identical
Core Size	8-Bit	8-Bit	Identical
Speed	40MHz	40MHz	Identical
Program Memory Size	64KB (64K x 8)	64KB (64K x 8)	Identical
Program Memory Type	FLASH	FLASH	Identical
EEPROM Size	2K x 8	2K x 8	Identical
RAM Size	2.25K x 8	2.25K x 8	Identical
Voltage Supply (Vcc/Vdd)	3V ~ 5.5V	3V ~ 5.5V	Identical
Data Converters	A/D 8x10b	A/D 8x10b	Identical
Number of I/O	36	36	Identical
Connectivity	CANbus, UART/USART	CANbus, SPI, UART/USART	Substitute includes SPI
Peripherals	POR, PWM, WDT	POR, PWM, WDT	Identical
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	44-VQFP (10x10)	64-LQFP (10x10)	Different package
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute is compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	Identical

Engineering Selection Recommendations

The AT89C51CC03UA-RDTUM is the manufacturer-recommended substitute for the obsolete AT89C51CC03U-RLRIM. Selection of this substitute is supported by the following factors:

Functional equivalence across all core processor, memory, speed, voltage, and peripheral specifications
Active product status ensuring continued availability and supply chain support
ROHS3 compliance, addressing regulatory requirements not met by the original part
Identical MSL rating and operating temperature range
Enhanced connectivity feature set (addition of SPI interface) providing functional superset capability
Same base product number (AT89C51) confirming design lineage and compatibility

Package format change from 44-VQFP to 64-LQFP requires PCB redesign. This substitution is appropriate for new designs and legacy system updates where board layout modification is feasible.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51CC03UA-RDTUM be used as a direct pin-for-pin replacement?

A: No. The AT89C51CC03UA-RDTUM uses a 64-LQFP package while the original uses 44-VQFP. Although both packages are 10x10mm, the pin count and layout differ, requiring PCB redesign.

Q: What is the significance of the additional SPI connectivity in the substitute part?

A: The AT89C51CC03UA-RDTUM includes SPI in addition to CANbus and UART/USART. This represents an enhanced feature set. Existing designs using only CANbus and UART/USART remain fully compatible; the SPI interface is optional for new applications.

Q: Why is the original part classified as obsolete?

A: The AT89C51CC03U-RLRIM is listed as obsolete by the manufacturer. The AT89C51CC03UA-RDTUM is the active production equivalent, ensuring long-term availability and support.

Q: Does the RoHS3 compliance of the substitute affect compatibility?

A: RoHS3 compliance is a manufacturing and environmental standard that does not affect electrical or functional compatibility. The substitute meets current regulatory requirements while maintaining full functional equivalence.

Q: Are there any differences in memory specifications between the two parts?

A: No. Both parts feature identical 64KB FLASH program memory, 2.25KB RAM, and 2KB EEPROM configurations.

Q: What is the impact of the different package on design considerations?

A: The 64-LQFP package provides 64 pins versus 44 pins in the VQFP package. PCB layout, routing, and thermal management strategies must be re-evaluated for the new package format. Pin assignment and functionality remain equivalent for the 36 I/O pins specified.

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