AT89C51IC2-SLRIM Equivalent & Substitute Parts

Part Overview

The AT89C51IC2-SLRIM is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 32KB FLASH program memory and a 60MHz operating speed. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates within a 2.7V to 5.5V supply range and integrates standard peripherals including I2C, SPI, and UART/USART connectivity.

Substiute Parts

AT89C51IC2-SLRIM

Microchip TechnologyIn Stock: 758AT89C51IC2-SLRIM Datasheet

Current PartRFQ

AT89C51IC2-SLRUM

Microchip TechnologyIn Stock: 1167AT89C51IC2-SLRUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51IC2-SLRIM is determined by the following critical parameters:

• Core Processor Architecture: Must be 80C51 compatible
• Program Memory: 32KB FLASH minimum
• RAM Configuration: 1.25K x 8 minimum
• I/O Count: 34 pins
• Package Type: 44-LCC (J-Lead) surface mount
• Supply Voltage Range: 2.7V ~ 5.5V compatibility
• Connectivity Interfaces: I2C, SPI, UART/USART support
• Peripheral Set: POR, PWM, WDT functionality

The AT89C51IC2-SLRUM qualifies as a direct substitute based on matching all core architectural and functional parameters. Differences in operating speed (40MHz vs. 60MHz) and product status do not preclude substitution in applications where the lower speed specification is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51IC2-SLRUM is the qualified substitute for the obsolete AT89C51IC2-SLRIM. Selection between these parts should be based on the following factors:

Product Status: The AT89C51IC2-SLRUM carries Active product status, ensuring continued availability and manufacturer support. The AT89C51IC2-SLRIM is classified as Obsolete, limiting future procurement options.

Regulatory Compliance: The AT89C51IC2-SLRUM meets ROHS3 compliance requirements, whereas the AT89C51IC2-SLRIM is RoHS non-compliant. For applications subject to RoHS regulations, the substitute part is the appropriate selection.

Operating Speed Consideration: The substitute operates at 40MHz compared to the main part's 60MHz. Applications requiring the full 60MHz performance specification must evaluate whether the reduced speed impacts system timing requirements.

Packaging Format: The AT89C51IC2-SLRUM is supplied in Tape & Reel format, suitable for automated assembly processes. The AT89C51IC2-SLRIM is supplied in tube packaging.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51IC2-SLRUM directly replace the AT89C51IC2-SLRIM in existing designs?

A: Yes, provided the application does not require the full 60MHz operating speed. The substitute maintains identical pin configuration, memory architecture, I/O count, and peripheral functionality. PCB layout and firmware compatibility are preserved.

Q: What is the impact of the 40MHz vs. 60MHz speed difference?

A: The 40MHz specification of the substitute represents a 33% reduction in maximum clock frequency. Applications with timing-critical operations or high-speed serial communication requirements must verify that system performance remains acceptable at the lower speed.

Q: Are there packaging compatibility concerns?

A: Both parts use identical 44-LCC (J-Lead) surface mount packages with matching pinouts. Packaging format differences (Tube vs. Tape & Reel) affect procurement and assembly processes but not component-level compatibility.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance is a regulatory and supply chain consideration rather than a functional one. The AT89C51IC2-SLRUM's ROHS3 compliance makes it the appropriate choice for applications subject to RoHS directives.

Q: Is firmware modification required when switching to the substitute?

A: No firmware modification is required. Both parts implement the same 80C51 instruction set and peripheral architecture. Existing firmware compiled for the AT89C51IC2-SLRIM executes without modification on the AT89C51IC2-SLRUM, subject to the operating speed constraint noted above.