AT89C51IC2-SLSIL Equivalent & Substitute Parts

Part Overview

The AT89C51IC2-SLSIL is an 8-bit microcontroller based on the 80C51 core architecture, featuring 32KB of FLASH program memory and operating at 40MHz. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and production requirements. The part is housed in a 44-PLCC surface mount package and operates across an industrial temperature range of -40°C to 85°C.

Substiute Parts

AT89C51IC2-SLSIL

Microchip TechnologyIn Stock: 928AT89C51IC2-SLSIL Datasheet

Current PartRFQ

AT89C51IC2-SLSUL

AtmelIn Stock: 1069AT89C51IC2-SLSUL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51IC2-SLSIL is determined by strict equivalence across the following critical parameters:

• Core Processor Architecture: Must be 80C51 compatible
• Program Memory: 32KB FLASH minimum
• RAM Configuration: 1.25K x 8 bytes
• Package Type: 44-PLCC surface mount form factor
• Voltage Supply Range: 2.7V to 3.6V operation
• Operating Temperature Range: -40°C to 85°C
• Connectivity Interfaces: I2C, SPI, UART/USART support
• Peripheral Set: POR, PWM, WDT functionality

The AT89C51IC2-SLSUL qualifies as a direct substitute based on identical core architecture, memory configuration, package specification, voltage range, temperature rating, and peripheral feature set. The primary distinction is operational speed (60MHz versus 40MHz), which represents an enhancement rather than a limitation for substitution purposes.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51IC2-SLSUL is a qualified substitute for the obsolete AT89C51IC2-SLSIL. Selection of the substitute part is justified on the following basis:

• Product Status: The substitute maintains active product status, ensuring continued availability and manufacturing support
• Functional Equivalence: Identical core processor, memory configuration, package specification, and peripheral feature set
• Performance Enhancement: The increased clock speed (60MHz versus 40MHz) provides operational headroom without introducing compatibility constraints
• Compliance Alignment: Both parts share identical ECCN (3A991A2) and HTSUS (8542.31.0001) classifications
• Voltage and Temperature Compatibility: Identical supply voltage range and operating temperature specifications ensure direct substitution in existing designs

Frequently Asked Questions (FAQ)

Q: Can the AT89C51IC2-SLSUL be used as a direct replacement for the AT89C51IC2-SLSIL?

A: Yes. Both devices share identical core processor architecture, program memory capacity, RAM configuration, package type, voltage supply range, operating temperature range, and peripheral feature set. The substitute part operates at a higher clock speed (60MHz), which is compatible with designs specified for 40MHz operation.

Q: Are there any package compatibility concerns?

A: No. Both parts use the 44-PLCC (16.6x16.6) surface mount package with identical pinout and mechanical specifications. PCB footprints and assembly processes require no modification.

Q: What is the significance of the speed difference between 40MHz and 60MHz?

A: The AT89C51IC2-SLSUL operates at 60MHz compared to the 40MHz specification of the AT89C51IC2-SLSIL. This represents a performance enhancement. Designs originally specified for 40MHz operation will function correctly with the faster substitute part, as timing-critical applications will execute more rapidly without violating setup or hold time constraints.

Q: Are voltage supply requirements identical?

A: Yes. Both parts operate across the identical voltage supply range of 2.7V to 3.6V. Power supply design and decoupling requirements remain unchanged.

Q: What is the impact of the product status difference?

A: The main part (AT89C51IC2-SLSIL) is classified as obsolete, indicating discontinued manufacturing and limited availability. The substitute part (AT89C51IC2-SLSUL) maintains active product status, ensuring reliable long-term supply and manufacturing support for production requirements.