AT89C2051-24PI Equivalent & Substitute Parts

Part Overview

The AT89C2051-24PI is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 2KB of FLASH program memory and 128 bytes of RAM. This device implements the 8051 core architecture with a 24MHz operating frequency and 15 I/O pins, supporting UART/USART connectivity and LED peripherals.

The AT89C2051-24PI is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.

Substiute Parts

AT89C2051-24PI

Microchip TechnologyIn Stock: 6393AT89C2051-24PI Datasheet

Current PartRFQ

AT89C2051-24PU

Microchip TechnologyIn Stock: 18696AT89C2051-24PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Core Architecture: 8051 processor core
• Memory Configuration: 2KB FLASH program memory and 128 x 8 RAM
• Operating Frequency: 24MHz
• I/O Count: 15 I/O pins
• Electrical Specifications: 4V ~ 6V supply voltage, -40°C ~ 85°C operating temperature range
• Package Format: 20-DIP through-hole mounting
• Connectivity: UART/USART interface support

The AT89C2051-24PU meets all these criteria and qualifies as a direct substitute. The primary distinction between these parts is packaging format (tube versus DIP) and product status (active versus obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT89C2051-24PU is the direct substitute for the AT89C2051-24PI. Both devices share identical electrical and functional specifications, including core architecture, memory configuration, operating frequency, I/O count, voltage supply range, and temperature operating range.

The AT89C2051-24PU offers two significant advantages:

• Product Status: The AT89C2051-24PU maintains active product status with verified programmability, ensuring ongoing manufacturer support and supply availability.
• Compliance: The AT89C2051-24PU is ROHS3 compliant, whereas the AT89C2051-24PI is RoHS non-compliant, making the substitute part suitable for applications requiring regulatory compliance.

Both parts are packaged in 20-DIP through-hole format with identical pinout and mechanical dimensions, enabling direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

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

A: Yes. The AT89C2051-24PU is electrically and functionally identical to the AT89C2051-24PI. Both devices feature the same 8051 core, 24MHz frequency, 2KB FLASH memory, 128 bytes RAM, 15 I/O pins, and 20-DIP package. Direct substitution is possible without circuit modification.

Q: What is the difference between the AT89C2051-24PI and AT89C2051-24PU?

A: The primary differences are product status and compliance certification. The AT89C2051-24PI is obsolete and RoHS non-compliant. The AT89C2051-24PU is an active product with ROHS3 compliance. Packaging format differs (DIP versus tube), but electrical and functional specifications are identical.

Q: Are there pin-to-pin compatibility concerns?

A: No. Both the AT89C2051-24PI and AT89C2051-24PU use the 20-DIP package with identical pinout and mechanical dimensions (0.300", 7.62mm). Pin-to-pin compatibility is complete.

Q: Does the AT89C2051-24PU support the same voltage and temperature ranges?

A: Yes. The AT89C2051-24PU operates across the same voltage supply range (4V ~ 6V) and temperature range (-40°C ~ 85°C) as the AT89C2051-24PI.

Q: Is the AT89C2051-24PU programmable?

A: Yes. The AT89C2051-24PU is verified as programmable by DiGi-Electronics, whereas the AT89C2051-24PI programmability status is not verified.