AT89C4051-24PC Equivalent & Substitute Parts

Part Overview

The AT89C4051-24PC is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 4KB FLASH program memory, 128 bytes of RAM, and 15 I/O pins. Designed for embedded applications requiring low-cost 8051-compatible processing, this device operates at 24MHz with integrated UART/USART connectivity and brown-out detection. The AT89C4051-24PC is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

AT89C4051-24PC

Microchip TechnologyIn Stock: 1245AT89C4051-24PC Datasheet

Current PartRFQ

AT89C4051-24PU

Microchip TechnologyIn Stock: 15642AT89C4051-24PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89C4051-24PC is determined by strict equivalence across core functional and electrical parameters. The substitute part must maintain identical specifications for processor architecture (8051 core), memory configuration (4KB FLASH, 128 bytes RAM), clock speed (24MHz), I/O count (15 pins), voltage supply range (4V ~ 6V), connectivity (UART/USART), and physical packaging (20-DIP). The AT89C4051-24PU qualifies as a direct substitute based on complete alignment with these critical parameters. Differences in product status, operating temperature range, RoHS compliance, and packaging format (tube vs. standard) do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

The AT89C4051-24PU is the direct functional equivalent of the AT89C4051-24PC. Both devices share identical core architecture, memory configuration, clock frequency, I/O specifications, and physical packaging. The AT89C4051-24PU is preferred for new designs and ongoing production due to its active product status and ROHS3 compliance. The extended operating temperature range of the AT89C4051-24PU (-40°C ~ 85°C) provides broader environmental capability compared to the AT89C4051-24PC (0°C ~ 70°C), making it suitable for applications requiring enhanced thermal performance. Pin-for-pin compatibility and identical electrical characteristics ensure seamless integration into existing PCB layouts and firmware implementations.

Frequently Asked Questions (FAQ)

Q: Can AT89C4051-24PU directly replace AT89C4051-24PC in existing designs? A: Yes. Both devices are pin-for-pin compatible with identical electrical specifications, memory configuration, and I/O characteristics. No PCB modifications or firmware changes are required.

Q: What is the difference in operating temperature range? A: The AT89C4051-24PC operates from 0°C to 70°C, while the AT89C4051-24PU operates from -40°C to 85°C. The extended range of the AT89C4051-24PU accommodates applications requiring operation in wider environmental conditions.

Q: Are there packaging differences between these parts? A: Both devices use 20-DIP (0.300", 7.62mm) through-hole packaging. The AT89C4051-24PC is supplied in standard packaging, while the AT89C4051-24PU is supplied in tube packaging. This difference does not affect electrical or mechanical compatibility.

Q: What is the significance of RoHS compliance? A: The AT89C4051-24PU is ROHS3 compliant, meeting current environmental and material restriction standards. The AT89C4051-24PC is RoHS non-compliant. For applications subject to RoHS regulations, the AT89C4051-24PU is the required choice.

Q: Why is the AT89C4051-24PC classified as obsolete? A: Obsolete status indicates the part is no longer in active production. The AT89C4051-24PU remains in active production and serves as the current equivalent for this device family.

Q: Are memory specifications identical between these parts? A: Yes. Both devices feature 4KB FLASH program memory, 128 bytes of RAM, and identical memory access characteristics. No firmware modifications are necessary when substituting between these parts.