AT89C51RB2-SLRIM Equivalent & Substitute Parts

Part Overview

The AT89C51RB2-SLRIM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 16KB FLASH program memory, 1.25KB RAM, and 32 I/O pins in a 44-PLCC package. This device operates at 60MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as SPI, UART/USART, POR, PWM, and WDT functionality.

The AT89C51RB2-SLRIM is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing production requirements, maintenance operations, and system redesigns where component availability is constrained.

Substiute Parts

AT89C51RB2-SLRIM

Microchip TechnologyIn Stock: 1203AT89C51RB2-SLRIM Datasheet

Current PartRFQ

AT89C51RB2-SLRUM

Microchip TechnologyIn Stock: 829AT89C51RB2-SLRUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51RB2-SLRIM is determined by strict equivalence across the following critical parameters:

• Core processor architecture (80C51)
• Core size (8-Bit)
• Operating speed (60MHz)
• Program memory capacity and type (16KB FLASH)
• RAM capacity (1.25K x 8)
• I/O pin count (32)
• Supply voltage range (2.7V ~ 5.5V)
• Connectivity interfaces (SPI, UART/USART)
• Integrated peripherals (POR, PWM, WDT)
• Operating temperature range (-40°C ~ 85°C)
• Physical package (44-LCC J-Lead, 44-PLCC 16.6x16.6)

The AT89C51RB2-SLRUM meets all substitution criteria as a direct functional equivalent. The primary distinction between these parts is packaging format (Tape & Reel versus standard packaging) and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51RB2-SLRUM is the direct substitute for the AT89C51RB2-SLRIM. Both parts are electrically and mechanically identical across all functional parameters.

Selection between these parts should be based on the following factors:

Product Status: The AT89C51RB2-SLRIM is obsolete, while the AT89C51RB2-SLRUM maintains active product status. For new designs and ongoing production, the AT89C51RB2-SLRUM is the appropriate selection.

Compliance Certifications: The AT89C51RB2-SLRUM is ROHS3 compliant, whereas the AT89C51RB2-SLRIM is RoHS non-compliant. Applications subject to RoHS regulatory requirements must use the AT89C51RB2-SLRUM.

Packaging Format: The AT89C51RB2-SLRUM is supplied in Tape & Reel format, suitable for automated assembly operations. The AT89C51RB2-SLRIM uses standard packaging. Packaging selection depends on production volume and assembly methodology.

Moisture Sensitivity: The AT89C51RB2-SLRUM has MSL 3 (168 Hours), while the AT89C51RB2-SLRIM has MSL 2 (1 Year). Storage and handling procedures must align with the specified moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Are the AT89C51RB2-SLRIM and AT89C51RB2-SLRUM pin-compatible?

A: Yes. Both parts use the 44-LCC (J-Lead) package with 44-PLCC (16.6x16.6) dimensions. Pin assignments, signal definitions, and electrical characteristics are identical. Direct PCB substitution is possible without layout modifications.

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

A: The primary differences are packaging format (Tape & Reel versus standard packaging), product lifecycle status (Active versus Obsolete), RoHS compliance (ROHS3 Compliant versus non-compliant), and moisture sensitivity level (MSL 3 versus MSL 2). Electrical and functional specifications are identical.

Q: Can the AT89C51RB2-SLRUM replace the AT89C51RB2-SLRIM in existing designs?

A: Yes. The AT89C51RB2-SLRUM is a direct functional equivalent. No firmware modifications, circuit redesign, or PCB layout changes are required. The substitute part operates identically within the same electrical and thermal parameters.

Q: Are there any compliance or regulatory considerations when substituting these parts?

A: The AT89C51RB2-SLRUM is ROHS3 compliant, while the AT89C51RB2-SLRIM is not. Applications subject to RoHS directives must use the compliant variant. Both parts are REACH Unaffected and carry the same ECCN and HTSUS classifications.

Q: What are the storage and handling requirements for these parts?

A: The AT89C51RB2-SLRUM has MSL 3 (168 Hours), requiring controlled humidity storage. The AT89C51RB2-SLRIM has MSL 2 (1 Year), allowing extended dry storage. Refer to manufacturer datasheets for specific moisture control procedures and bake-out requirements prior to reflow soldering.

Q: Is the AT89C51RB2-SLRUM suitable for high-volume production?

A: Yes. The Tape & Reel packaging format of the AT89C51RB2-SLRUM is optimized for automated pick-and-place assembly, making it the standard choice for high-volume manufacturing operations.