AT87C58X2-SLSUM Equivalent & Substitute Parts

Part Overview

The AT87C58X2-SLSUM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 32KB OTP (One-Time Programmable) memory and operating at 40/20MHz. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The 44-PLCC package and core architecture remain relevant for legacy system maintenance and replacement scenarios.

Substiute Parts

AT87C58X2-SLSUM

Microchip TechnologyIn Stock: 1762AT87C58X2-SLSUM Datasheet

Current PartRFQ

AT89C51RC2-SLSUM

Microchip TechnologyIn Stock: 15760AT89C51RC2-SLSUM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT87C58X2-SLSUM is determined by the following critical parameters:

Core Architecture Compatibility: Both the main part and substitute must utilize the 80C51 core processor to ensure instruction set compatibility and firmware portability.

Memory Configuration: Program memory size of 32KB (32K x 8) is maintained as a baseline requirement for code capacity equivalence.

Package Compatibility: The 44-LCC (J-Lead) surface mount package ensures mechanical and electrical pin compatibility on existing PCBs.

Electrical Specifications: Operating voltage range and temperature range must support the application's environmental and power supply constraints.

Memory Technology: While the main part uses OTP (One-Time Programmable) memory, substitutes with FLASH memory technology provide enhanced programmability and are acceptable for equivalent functionality, as FLASH memory is a superset capability of OTP.

The AT89C51RC2-SLSUM qualifies as a direct substitute based on these criteria: identical 80C51 core, matching 32KB program memory capacity, compatible 44-PLCC package, overlapping voltage and temperature specifications, and active product status with verified programmability.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51RC2-SLSUM is the qualified substitute for the AT87C58X2-SLSUM based on the following engineering criteria:

Product Status: The AT89C51RC2-SLSUM maintains active product status with verified programmability, ensuring long-term availability and supply chain continuity compared to the obsolete AT87C58X2-SLSUM.

Compliance Certification: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

Core Architecture: Identical 80C51 core processor ensures firmware compatibility without code modification, supporting direct migration paths for legacy applications.

Memory Capacity: Matching 32KB program memory and enhanced RAM capacity (1.25K x 8 versus 256 x 8) provide equivalent or improved functionality for existing code bases.

Electrical Compatibility: The AT89C51RC2-SLSUM supports a wider voltage range (2.7V ~ 5.5V) and higher clock speed (60MHz), providing operational flexibility while maintaining backward compatibility with 4.5V ~ 5.5V supply designs.

Package Compatibility: Identical 44-LCC (J-Lead) package ensures direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51RC2-SLSUM directly replace the AT87C58X2-SLSUM without PCB modifications?

A: Yes. Both devices use the 44-LCC (J-Lead) package with identical pinout and electrical characteristics within the overlapping voltage range (4.5V ~ 5.5V). No PCB layout changes are required.

Q: What is the primary difference between OTP and FLASH memory in these devices?

A: OTP (One-Time Programmable) memory in the AT87C58X2-SLSUM can be programmed once during manufacturing. FLASH memory in the AT89C51RC2-SLSUM can be erased and reprogrammed multiple times, providing greater flexibility for development and field updates.

Q: Does the higher clock speed of the AT89C51RC2-SLSUM (60MHz vs. 40/20MHz) affect compatibility?

A: No. The AT89C51RC2-SLSUM operates at higher speed but maintains full backward compatibility. Existing firmware will execute correctly at the higher clock rate. Applications requiring specific timing may benefit from the increased speed margin.

Q: Is the expanded RAM in the AT89C51RC2-SLSUM (1.25K x 8 vs. 256 x 8) a compatibility concern?

A: No. Expanded RAM is a superset capability. Firmware designed for 256 x 8 RAM will function identically on the AT89C51RC2-SLSUM. Additional RAM capacity provides headroom for enhanced functionality if needed.

Q: Are there any supply voltage considerations when substituting these devices?

A: The AT89C51RC2-SLSUM supports a wider voltage range (2.7V ~ 5.5V) compared to the AT87C58X2-SLSUM (4.5V ~ 5.5V). For applications operating at 4.5V ~ 5.5V, both devices are fully compatible. For applications requiring operation below 4.5V, only the AT89C51RC2-SLSUM is suitable.

Q: What certifications apply to both devices?

A: Both the AT87C58X2-SLSUM and AT89C51RC2-SLSUM are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.