AT89C51RC-24AI Equivalent & Substitute Parts

Part Overview

The AT89C51RC-24AI is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 32KB FLASH program memory, 512 x 8 RAM, and 32 I/O pins in a 44-TQFP surface mount package. This device operates at 24MHz with supply voltage range of 4V to 5.5V and includes integrated SPI and UART/USART connectivity with watchdog timer peripheral.

The AT89C51RC-24AI carries an Obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this microcontroller.

Substiute Parts

AT89C51RC-24AI

Microchip TechnologyIn Stock: 1001AT89C51RC-24AI Datasheet

Current PartRFQ

AT89C51RC-24AU

Microchip TechnologyIn Stock: 15771AT89C51RC-24AU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51RC-24AI is determined by strict equivalence across the following critical parameters:

• Core processor architecture (8051)
• Core size (8-Bit)
• Operating frequency (24MHz)
• Program memory capacity and type (32KB FLASH)
• RAM capacity (512 x 8)
• I/O pin count (32)
• Connectivity interfaces (SPI, UART/USART)
• Peripheral features (WDT)
• Supply voltage range (4V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Package type and pin configuration (44-TQFP 10x10)
• Mounting technology (Surface Mount)

The AT89C51RC-24AU qualifies as a direct substitute based on complete alignment with all specified electrical and mechanical parameters. The primary distinction between these parts is packaging format and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51RC-24AU is the direct substitute for the AT89C51RC-24AI. Both parts share identical electrical specifications, memory configuration, I/O architecture, and package geometry, ensuring functional and mechanical compatibility in existing designs.

The AT89C51RC-24AU offers two significant advantages over the obsolete AT89C51RC-24AI:

• Active product status ensures ongoing availability and manufacturer support
• ROHS3 compliance satisfies current environmental and regulatory requirements, whereas the AT89C51RC-24AI is RoHS non-compliant

For new designs or production transitions, the AT89C51RC-24AU is the appropriate selection. For legacy system maintenance where the original AT89C51RC-24AI is no longer available, the AT89C51RC-24AU provides full functional equivalence with improved compliance posture.

Frequently Asked Questions (FAQ)

Q: Are AT89C51RC-24AI and AT89C51RC-24AU pin-for-pin compatible?

A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin assignments, electrical characteristics, and functional behavior. Direct PCB substitution is supported without design modification.

Q: What is the difference between the AT89C51RC-24AI and AT89C51RC-24AU?

A: The primary differences are product lifecycle status and regulatory compliance. The AT89C51RC-24AI is Obsolete and RoHS non-compliant. The AT89C51RC-24AU is Active and ROHS3 compliant. All electrical and mechanical specifications are identical.

Q: Can I use AT89C51RC-24AU in place of AT89C51RC-24AI in existing production?

A: Yes. The AT89C51RC-24AU is a direct functional and mechanical equivalent. No firmware, PCB layout, or schematic modifications are required. The substitute part maintains full compatibility with existing designs.

Q: What packaging formats are available for these parts?

A: The AT89C51RC-24AI is supplied in standard packaging. The AT89C51RC-24AU is supplied in Tray packaging. Both use the same 44-TQFP (10x10) surface mount package type.

Q: Are there any supply voltage or temperature rating differences?

A: No. Both parts operate across the identical supply voltage range (4V ~ 5.5V) and temperature range (-40°C ~ 85°C). All electrical operating parameters are equivalent.

Q: What is the Moisture Sensitivity Level for these microcontrollers?

A: Both the AT89C51RC-24AI and AT89C51RC-24AU carry MSL 3 rating with a 168-hour floor life. Identical moisture handling and storage requirements apply to both parts.