AT80C32X2-SLRUL Equivalent & Substitute Parts

Part Overview

The AT80C32X2-SLRUL is an 8-bit microcontroller from Microchip Technology's 80C series, featuring a ROMless architecture in a 44-PLCC surface mount package. This device operates at 30/20MHz with a supply voltage range of 2.7V to 5.5V and includes 256 x 8 bytes of RAM, 32 I/O pins, and UART/USART connectivity with Power-On Reset (POR) functionality.

The AT80C32X2-SLRUL has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for systems utilizing this microcontroller.

Substiute Parts

AT80C32X2-SLRUL

Microchip TechnologyIn Stock: 1050AT80C32X2-SLRUL Datasheet

Current PartRFQ

AT80C51RD2-SLRUM

Microchip TechnologyIn Stock: 2166AT80C51RD2-SLRUM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT80C32X2-SLRUL is determined by the following critical parameters:

Core Architecture & Processor: Both the main part and substitute must utilize the 80C51 core processor with 8-bit architecture to ensure instruction set compatibility and firmware portability.

Package & Pinout: The 44-LCC (J-Lead) surface mount package with identical pin configuration (44-PLCC 16.6x16.6) is mandatory for mechanical and electrical compatibility with existing PCB layouts.

Memory Architecture: ROMless program memory type is required to maintain functional equivalence. RAM capacity may exceed the original specification without creating incompatibility.

Voltage Supply Range: The substitute must support the 2.7V to 5.5V supply voltage range to ensure operation across the same power supply specifications.

I/O Pin Count: 32 I/O pins are required to match the original design's interface capabilities.

Connectivity & Peripherals: UART/USART connectivity must be present. Additional peripherals in the substitute do not preclude substitution.

Compliance Standards: RoHS3 compliance and REACH unaffected status ensure regulatory alignment with the original part.

Parameter Comparison

Engineering Selection Recommendations

The AT80C51RD2-SLRUM is a qualified substitute for the obsolete AT80C32X2-SLRUL based on the following engineering criteria:

Architectural Compatibility: Both devices implement the 80C51 core processor with identical 8-bit instruction set architecture, ensuring firmware compatibility without modification.

Package Equivalence: Identical 44-LCC (J-Lead) surface mount packaging with matching pinout enables direct PCB layout compatibility.

Electrical Specifications: The substitute maintains the 2.7V to 5.5V supply voltage range and -40°C to 85°C operating temperature range, supporting equivalent system integration.

Performance Enhancement: The AT80C51RD2-SLRUM operates at 40MHz (versus 30/20MHz) and provides 1K x 8 RAM (versus 256 x 8), representing performance improvements that do not introduce incompatibility. Additional peripherals (PWM, WDT) are available but not required for operation.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying equivalent environmental and regulatory requirements.

Product Status: The substitute is in active production status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the AT80C51RD2-SLRUM be used as a direct replacement for the AT80C32X2-SLRUL without PCB modifications?

A: Yes. Both devices share identical 44-LCC (J-Lead) packaging, pinout configuration, and core 80C51 processor architecture. No PCB layout changes are required for mechanical or electrical compatibility.

Q: Will existing firmware for the AT80C32X2-SLRUL execute on the AT80C51RD2-SLRUM without modification?

A: Yes. The 80C51 instruction set is identical across both devices. Firmware compiled for the original part will execute on the substitute without code changes.

Q: What are the differences in RAM capacity, and does this affect substitution?

A: The AT80C51RD2-SLRUM provides 1K x 8 RAM compared to 256 x 8 in the original part. This represents a 4x increase in available RAM, which is a performance enhancement. Existing firmware designed for 256 x 8 RAM will operate without modification on the substitute.

Q: Does the higher operating speed (40MHz versus 30/20MHz) of the substitute create compatibility issues?

A: No. The substitute's higher speed rating is a performance enhancement. Systems designed for 30/20MHz operation will function correctly at the substitute's rated speed. Timing-critical applications should verify that the increased speed does not introduce unintended behavior in peripheral timing or external interface protocols.

Q: Are the additional peripherals (PWM, WDT) in the AT80C51RD2-SLRUM required for substitution?

A: No. The additional peripherals are optional enhancements. Existing designs that do not utilize PWM or WDT functionality will operate identically on the substitute. These peripherals are available for new feature implementation if required.

Q: What is the moisture sensitivity level difference, and does it affect handling?

A: The original part specifies MSL 2 (1 Year), while the substitute specifies MSL 3 (168 Hours). The substitute requires more stringent moisture control during storage and handling. Ensure compliance with MSL 3 storage and reflow requirements per IPC-A-610 standards.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the AT80C32X2-SLRUL and AT80C51RD2-SLRUM are ROHS3 compliant and REACH unaffected, ensuring equivalent environmental regulatory status.