AT89C51RC2-SLRIM Equivalent & Substitute Parts

Part Overview

The AT89C51RC2-SLRIM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 32KB FLASH program memory, 1.25KB RAM, and 32 I/O pins in a 44-PLCC package. This device operates at 60MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as SPI, UART/USART, POR, PWM, and WDT functionality.

The AT89C51RC2-SLRIM is classified as obsolete. Locating equivalent substitute parts is necessary for ongoing system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Core Processor	80C51
Core Size	8-Bit
Speed	60MHz
Program Memory Size	32KB (32K x 8)
Program Memory Type	FLASH
RAM Size	1.25K x 8
Number of I/O	32
Connectivity	SPI, UART/USART
Peripherals	POR, PWM, WDT
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	44-LCC (J-Lead)
Supplier Device Package	44-PLCC (16.6x16.6)

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51RC2-SLRIM is determined by strict equivalence across the following critical parameters:

Core Architecture: 80C51 processor family
Memory Configuration: 32KB FLASH program memory and 1.25KB RAM
I/O Count: 32 I/O pins
Connectivity & Peripherals: SPI, UART/USART, POR, PWM, WDT
Electrical Specifications: 2.7V to 5.5V supply voltage, -40°C to 85°C operating temperature
Package: 44-PLCC (16.6x16.6) surface mount configuration

The AT89C51RC2-SLRUM meets all substitution criteria, maintaining identical core functionality, memory architecture, I/O configuration, and package specifications as the main part.

Parameter Comparison

Parameter	AT89C51RC2-SLRIM (Main)	AT89C51RC2-SLRUM (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	80C51	80C51
Core Size	8-Bit	8-Bit
Speed	60MHz	60MHz
Program Memory Size	32KB (32K x 8)	32KB (32K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	1.25K x 8	1.25K x 8
Number of I/O	32	32
Connectivity	SPI, UART/USART	SPI, UART/USART
Peripherals	POR, PWM, WDT	POR, PWM, WDT
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	44-LCC (J-Lead)	44-LCC (J-Lead)
Supplier Device Package	44-PLCC (16.6x16.6)	44-PLCC (16.6x16.6)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

The AT89C51RC2-SLRUM is the direct functional equivalent of the AT89C51RC2-SLRIM. Both parts share identical core architecture, memory configuration, I/O specifications, and electrical operating parameters.

The AT89C51RC2-SLRUM offers the following advantages for new designs and system updates:

Product Status: Active production status ensures long-term availability and supply chain continuity.
Compliance: ROHS3 compliant, meeting current environmental and regulatory requirements.
Programmability: Verified programmable status through DiGi-Electronics.

The AT89C51RC2-SLRIM, while obsolete, remains functionally compatible with systems already deployed. Moisture sensitivity level differences (MSL 2 versus MSL 3) reflect storage and handling requirements; the MSL 3 rating of the substitute part requires adherence to 168-hour dry storage protocols prior to soldering.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51RC2-SLRUM directly replace the AT89C51RC2-SLRIM in existing designs?

A: Yes. Both parts are functionally equivalent across all critical parameters: 80C51 core architecture, 32KB FLASH memory, 1.25KB RAM, 32 I/O pins, identical connectivity (SPI, UART/USART), and matching peripheral sets (POR, PWM, WDT). Electrical specifications and operating temperature ranges are identical. Pin-for-pin compatibility is maintained in the 44-PLCC package.

Q: What is the difference in RoHS compliance between these parts?

A: The AT89C51RC2-SLRIM is RoHS non-compliant. The AT89C51RC2-SLRUM is ROHS3 compliant, meeting current environmental directives. For new designs and systems subject to RoHS requirements, the substitute part is the appropriate selection.

Q: Are there package or pinout differences?

A: No. Both parts use identical 44-PLCC (16.6x16.6) surface mount packaging with 44-LCC (J-Lead) configuration. Pinout and mechanical dimensions are identical.

Q: What does the difference in Moisture Sensitivity Level (MSL) mean?

A: The AT89C51RC2-SLRIM has MSL 2 (1 Year storage), while the AT89C51RC2-SLRUM has MSL 3 (168 Hours storage). MSL 3 requires that the component be soldered within 168 hours of opening the moisture barrier bag. Proper dry storage and handling protocols must be followed to prevent moisture absorption prior to assembly.

Q: Is the substitute part suitable for high-temperature or low-temperature applications?

A: Both parts operate across the identical temperature range of -40°C to 85°C (TA). Temperature performance is equivalent.

Q: Can I use the AT89C51RC2-SLRUM in legacy systems designed for the AT89C51RC2-SLRIM?

A: Yes. Functional and electrical equivalence is complete. No design modifications are required. Existing firmware and hardware interfaces remain compatible.

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