AT89C51RC2-SLSIM Equivalent & Substitute Parts

Part Overview

The AT89C51RC2-SLSIM 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-SLSIM is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing system maintenance, design updates, and procurement continuity where original inventory is depleted or unavailable.

Substiute Parts

AT89C51RC2-SLSIM

Microchip TechnologyIn Stock: 2573AT89C51RC2-SLSIM Datasheet

Current PartRFQ

AT89C51RC2-SLSUM

Microchip TechnologyIn Stock: 15760AT89C51RC2-SLSUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Core Processor Architecture: Must be 80C51-based
• Core Size: Must be 8-Bit
• Program Memory: Must be 32KB FLASH
• RAM: Must be 1.25K x 8
• I/O Count: Must be 32 pins
• Speed: Must be 60MHz
• Supply Voltage Range: Must be 2.7V ~ 5.5V
• Package Type: Must be 44-PLCC (16.6x16.6) with 44-LCC (J-Lead) case
• Connectivity & Peripherals: Must include SPI, UART/USART, POR, PWM, and WDT

The AT89C51RC2-SLSUM meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51RC2-SLSUM is a direct functional equivalent to the AT89C51RC2-SLSIM. Both devices share identical electrical specifications, memory configuration, I/O architecture, and package dimensions.

The primary distinction is product lifecycle status: the AT89C51RC2-SLSIM is obsolete, while the AT89C51RC2-SLSUM is active and currently in production. The substitute part carries ROHS3 compliance certification, whereas the original part is RoHS non-compliant. The substitute part has a higher Moisture Sensitivity Level (MSL 3 vs. MSL 2), requiring adherence to stricter moisture control protocols during storage and handling.

For new designs or system replacements, the AT89C51RC2-SLSUM is the appropriate selection due to its active production status and regulatory compliance. Existing systems using the AT89C51RC2-SLSIM can transition to the substitute without circuit modification, provided moisture handling procedures are implemented according to MSL 3 requirements.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51RC2-SLSUM be used as a direct replacement for the AT89C51RC2-SLSIM?

A: Yes. Both parts are electrically and mechanically identical. They share the same 80C51 core architecture, 32KB FLASH memory, 1.25KB RAM, 32 I/O pins, 60MHz speed, and 44-PLCC package. No circuit modifications are required for substitution.

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

A: The AT89C51RC2-SLSIM is RoHS non-compliant. The AT89C51RC2-SLSUM is ROHS3 compliant, meeting current environmental and hazardous substance restrictions. For applications subject to RoHS regulations, the substitute part is required.

Q: How does the Moisture Sensitivity Level (MSL) difference affect handling?

A: The AT89C51RC2-SLSIM has MSL 2 (1 Year shelf life under controlled conditions). The AT89C51RC2-SLSUM has MSL 3 (168 Hours shelf life). MSL 3 requires stricter moisture control during storage and a shorter time window between package opening and component soldering. Proper baking procedures must be followed if the substitute part exceeds its MSL exposure time.

Q: Are the packaging options different?

A: Both parts use identical 44-PLCC (16.6x16.6) packages with 44-LCC (J-Lead) case configuration. The AT89C51RC2-SLSUM is supplied in Tube packaging, while the AT89C51RC2-SLSIM packaging type is not specified. This does not affect electrical or mechanical compatibility.

Q: Why is the original part classified as obsolete?

A: The AT89C51RC2-SLSIM has reached end-of-life status and is no longer in active production. The AT89C51RC2-SLSUM represents the current production equivalent and is the recommended part for ongoing procurement and new system designs.