AT89C2051-24PC Equivalent & Substitute Parts

Part Overview

The AT89C2051-24PC is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 2KB of FLASH program memory and 128 bytes of RAM. This device is designed for embedded applications requiring low-cost, compact microcontroller solutions with UART/USART connectivity and LED peripheral support.

The AT89C2051-24PC is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for legacy systems and new designs requiring compatible alternatives.

Substiute Parts

AT89C2051-24PC

Microchip TechnologyIn Stock: 1847AT89C2051-24PC Datasheet

Current PartRFQ

AT89C2051-24PU

Microchip TechnologyIn Stock: 18696AT89C2051-24PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89C2051-24PC is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051-based processor
• Memory Configuration: 2KB FLASH program memory, 128 x 8 RAM
• Operating Frequency: 24MHz
• Electrical Specifications: 4V ~ 6V supply voltage
• I/O Count: 15 I/O pins
• Package Format: 20-DIP through-hole mounting
• Connectivity: UART/USART interface
• Peripheral Support: LED capability

The AT89C2051-24PU meets all these criteria and is identified as a direct substitute. Both parts share identical core specifications, memory architecture, and functional capabilities. The primary differences are packaging format (tube vs. standard) and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The AT89C2051-24PU is the direct substitute for the AT89C2051-24PC. Both devices are functionally equivalent across all core electrical and mechanical parameters.

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

Product Status: The AT89C2051-24PU carries Active status, ensuring ongoing availability and supply chain support. The AT89C2051-24PC is classified as Obsolete, limiting future procurement options.

Compliance Certifications: The AT89C2051-24PU is ROHS3 compliant, meeting current regulatory requirements for electronic components. The AT89C2051-24PC is RoHS non-compliant, which may restrict use in applications subject to RoHS directives.

Operating Temperature Range: The AT89C2051-24PU supports -40°C ~ 85°C, providing extended temperature operation compared to the AT89C2051-24PC range of 0°C ~ 70°C. This extended range accommodates industrial and automotive applications with wider environmental requirements.

Packaging: The AT89C2051-24PU is supplied in tube packaging, while the AT89C2051-24PC uses standard packaging. Both are compatible with through-hole assembly processes.

For new designs and legacy system support, the AT89C2051-24PU is the recommended selection due to active product status and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Are AT89C2051-24PC and AT89C2051-24PU pin-compatible?

A: Yes. Both devices use the 20-DIP package with identical pin assignments, I/O configuration, and functional pinout. Direct socket substitution is possible without circuit modification.

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

A: The primary differences are product status (Obsolete vs. Active), RoHS compliance classification, operating temperature range, and packaging format. The core microcontroller functionality, memory configuration, and electrical specifications are identical.

Q: Can AT89C2051-24PU replace AT89C2051-24PC in existing designs?

A: Yes. The AT89C2051-24PU is a direct functional equivalent. Existing firmware and circuit designs require no modification. The extended operating temperature range of the substitute part provides additional environmental capability.

Q: What does the packaging format difference mean?

A: AT89C2051-24PC uses standard packaging, while AT89C2051-24PU is supplied in tube packaging. Both formats are compatible with standard through-hole assembly equipment and processes. Tube packaging is typically used for higher-volume production runs.

Q: Is the AT89C2051-24PU suitable for RoHS-regulated applications?

A: Yes. The AT89C2051-24PU is ROHS3 compliant and meets current RoHS directive requirements. The AT89C2051-24PC is RoHS non-compliant and may not be suitable for applications subject to RoHS regulations.

Q: What is the inventory status of these parts?

A: AT89C2051-24PC has 1,781 pieces in stock. AT89C2051-24PU has 18,650 pieces in stock. The significantly higher inventory of the substitute part reflects its Active product status and ongoing market demand.