AT89C4051-24PI Equivalent & Substitute Parts

Part Overview

The AT89C4051-24PI 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 at 24MHz operation, this component integrates UART/USART connectivity with integrated brown-out detection, LED control, and power-on reset functionality.

The AT89C4051-24PI carries an obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and access components with active manufacturing support and current compliance certifications.

Substiute Parts

AT89C4051-24PI

Microchip TechnologyIn Stock: 2378AT89C4051-24PI Datasheet

Current PartRFQ

AT89C4051-24PU

Microchip TechnologyIn Stock: 15642AT89C4051-24PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C4051-24PI is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051-compatible processor
• Memory Configuration: 4KB FLASH program memory, 128 x 8 RAM
• Clock Speed: 24MHz operation
• I/O Count: 15 I/O pins
• Supply Voltage: 4V ~ 6V operating range
• Temperature Range: -40°C ~ 85°C
• Package: 20-DIP through-hole form factor
• Connectivity & Peripherals: UART/USART, brown-out detection, LED control, power-on reset

The AT89C4051-24PU qualifies as a direct substitute, matching all electrical and mechanical specifications while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The AT89C4051-24PU is the direct substitute for the AT89C4051-24PI. Both components share identical electrical specifications, memory configuration, I/O architecture, and physical packaging. The AT89C4051-24PU offers two significant advantages:

Product Status: The AT89C4051-24PU maintains active manufacturing status, ensuring continued availability and supply chain stability compared to the obsolete AT89C4051-24PI.

Compliance Certifications: The AT89C4051-24PU is ROHS3 compliant, meeting current environmental and material restriction standards. The AT89C4051-24PI is RoHS non-compliant, which may present regulatory constraints in applications subject to RoHS requirements.

Programmability Verification: The AT89C4051-24PU carries verified programmability status through DiGi-Electronics, providing documented confirmation of flash programming capability.

For new designs or component refresh cycles, the AT89C4051-24PU is the appropriate selection. For legacy system maintenance requiring exact form-factor and functional equivalence, the AT89C4051-24PU provides drop-in compatibility with enhanced compliance and supply assurance.

Frequently Asked Questions (FAQ)

Q: Can the AT89C4051-24PU replace the AT89C4051-24PI in existing designs?

A: Yes. The AT89C4051-24PU is electrically and mechanically identical to the AT89C4051-24PI. Both components feature the same 8051 core architecture, 24MHz clock speed, 4KB FLASH memory, 128 bytes RAM, 15 I/O pins, 4V–6V supply range, and 20-DIP through-hole package. Direct substitution is supported without circuit modification.

Q: What is the difference between the -24PI and -24PU package designations?

A: The suffix designates packaging format. The AT89C4051-24PI uses standard packaging (designation not specified in available data), while the AT89C4051-24PU is supplied in tube packaging. Both maintain identical component specifications and 20-DIP form factor.

Q: Does the AT89C4051-24PU meet RoHS compliance requirements?

A: Yes. The AT89C4051-24PU is ROHS3 compliant. The AT89C4051-24PI is RoHS non-compliant. If your application or market requires RoHS certification, the AT89C4051-24PU is the required selection.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both components operate across the identical temperature range (-40°C to 85°C) and voltage supply window (4V to 6V). Thermal and electrical performance characteristics are equivalent.

Q: What is the significance of "Active" versus "Obsolete" product status?

A: Active status indicates ongoing manufacturing and supply availability. Obsolete status indicates discontinued production. The AT89C4051-24PU (Active) ensures long-term component availability, while the AT89C4051-24PI (Obsolete) may face supply constraints and eventual unavailability.