AT89C51ED2-SLSIM Equivalent & Substitute Parts

Part Overview

The AT89C51ED2-SLSIM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 64KB FLASH program memory, 2KB EEPROM, and 2KB RAM in a 44-PLCC surface mount package. This device integrates SPI and UART/USART connectivity with peripheral functions including Power-On Reset (POR), Pulse Width Modulation (PWM), and Watchdog Timer (WDT). The part is classified as obsolete, making identification of equivalent substitutes necessary for ongoing design support and component procurement.

Substiute Parts

AT89C51ED2-SLSIM

Microchip TechnologyIn Stock: 4581AT89C51ED2-SLSIM Datasheet

Current PartRFQ

AT89C51ED2-SLSUM

Microchip TechnologyIn Stock: 1583AT89C51ED2-SLSUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89C51ED2-SLSIM is determined by strict equivalence across the following critical parameters:

• Core processor architecture (80C51)
• Memory configuration (64KB FLASH, 2KB EEPROM, 2KB RAM)
• Electrical specifications (2.7V ~ 5.5V supply, 60MHz operation)
• I/O count (34 pins)
• Connectivity interfaces (SPI, UART/USART)
• Peripheral functions (POR, PWM, WDT)
• Operating temperature range (-40°C ~ 85°C)
• Physical package (44-PLCC, 16.6x16.6mm)

The AT89C51ED2-SLSUM meets all these criteria and qualifies as a direct functional equivalent. Substitution is valid when the replacement part maintains identical electrical, functional, and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51ED2-SLSUM is the direct equivalent substitute for the AT89C51ED2-SLSIM. Selection of the substitute part is based on the following factors:

• The main part (AT89C51ED2-SLSIM) carries obsolete product status, limiting long-term availability and procurement reliability.
• The substitute part (AT89C51ED2-SLSUM) maintains active product status, ensuring continued manufacturing and supply chain support.
• Both parts share identical electrical and functional specifications, enabling direct pin-for-pin replacement without circuit modification.
• The substitute part achieves ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the main part is RoHS non-compliant.
• Moisture sensitivity differs between the parts (MSL 2 vs. MSL 3), requiring appropriate handling and storage protocols during component management.

Frequently Asked Questions (FAQ)

Q: Can AT89C51ED2-SLSUM replace AT89C51ED2-SLSIM in existing designs?

A: Yes. Both parts are functionally identical across all electrical, memory, connectivity, and peripheral specifications. Pin-for-pin replacement is valid without circuit redesign.

Q: What is the difference between the two part numbers?

A: The primary differences are product status (obsolete vs. active), packaging format (SLSIM vs. SLSUM), RoHS compliance level, and moisture sensitivity rating. Electrical and functional performance are equivalent.

Q: Are there packaging differences between these parts?

A: Both parts use the same 44-PLCC (16.6x16.6mm) package with 44-LCC J-Lead configuration. The packaging designation suffix differs (SLSIM vs. SLSUM), reflecting supplier packaging format and handling specifications.

Q: What does the MSL rating difference mean for component handling?

A: MSL 2 (1 Year) indicates the main part tolerates one year of ambient storage before moisture absorption becomes critical. MSL 3 (168 Hours) indicates the substitute part requires reflow processing within 168 hours of package opening. Appropriate moisture control and storage procedures must be followed for the substitute part.

Q: Is the substitute part suitable for new designs?

A: Yes. The AT89C51ED2-SLSUM is the recommended choice for new designs due to active product status, ROHS3 compliance, and assured long-term availability.