AT89C2051-24SC Equivalent & Substitute Parts

Part Overview

The AT89C2051-24SC is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 2KB FLASH program memory, 128 bytes of RAM, and 15 I/O pins. Designed for embedded applications requiring UART/USART connectivity and LED peripheral support, this device operates at 24MHz with an internal oscillator.

The AT89C2051-24SC carries an obsolete product status. Locating equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for systems currently utilizing this microcontroller.

Substiute Parts

AT89C2051-24SC

Microchip TechnologyIn Stock: 2112AT89C2051-24SC Datasheet

Current PartRFQ

AT89C2051-24SU

Microchip TechnologyIn Stock: 15247AT89C2051-24SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C2051-24SC is determined by strict alignment across the following core parameters:

• Core Architecture: 8051-based processor
• Memory Configuration: 2KB FLASH program memory, 128 x 8 RAM
• Clock Speed: 24MHz operation
• I/O Count: 15 I/O pins
• Voltage Range: 4V ~ 6V supply compatibility
• Package Format: 20-SOIC surface mount package
• Connectivity: UART/USART interface support

The AT89C2051-24SU qualifies as a direct substitute based on identical core specifications, memory architecture, clock frequency, I/O configuration, voltage requirements, and package format. Differences in product status, operating temperature range, and compliance certifications do not affect functional substitutability within the defined electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The AT89C2051-24SU is a direct functional equivalent to the AT89C2051-24SC. Both devices share identical core processor architecture, memory configuration, clock speed, I/O pin count, voltage supply range, and 20-SOIC package format.

The AT89C2051-24SU offers additional advantages for new designs and ongoing production:

• Active Product Status: Ensures continued availability and long-term supply chain support, contrasting with the obsolete status of the AT89C2051-24SC.
• Extended Operating Temperature Range: The AT89C2051-24SU supports -40°C to 85°C operation, providing broader environmental compatibility compared to the 0°C to 70°C range of the AT89C2051-24SC.
• RoHS3 Compliance: The AT89C2051-24SU meets ROHS3 standards, whereas the AT89C2051-24SC is RoHS non-compliant.

For applications currently using the AT89C2051-24SC, direct substitution with the AT89C2051-24SU is supported without circuit modification, provided the extended temperature range and enhanced compliance posture align with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the AT89C2051-24SU replace the AT89C2051-24SC in existing designs?

A: Yes. Both devices are pin-compatible, share identical electrical specifications for core operation, and use the same 20-SOIC package. No circuit redesign is required for substitution.

Q: What are the key differences between these parts?

A: The AT89C2051-24SU is an active product with extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and RoHS3 compliance. The AT89C2051-24SC is obsolete and RoHS non-compliant. Functional performance and memory architecture are identical.

Q: Are there packaging differences?

A: Both parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package. The AT89C2051-24SU is supplied in tube packaging, while the AT89C2051-24SC packaging format is not specified in available data.

Q: Does the extended temperature range of the AT89C2051-24SU affect compatibility?

A: No. The extended range of the AT89C2051-24SU (-40°C to 85°C) encompasses the original operating range (0°C to 70°C). Applications operating within the original temperature window experience no compatibility issues.

Q: Is the AT89C2051-24SU suitable for new product designs?

A: Yes. The active product status, RoHS3 compliance, and extended temperature range make the AT89C2051-24SU the appropriate choice for new designs requiring 8051-based microcontroller functionality with 2KB FLASH memory and 24MHz operation.