AT89S51-24PI Equivalent & Substitute Parts

Part Overview

The AT89S51-24PI is an 8-bit microcontroller from Microchip Technology's 89S series, featuring 4KB of FLASH program memory, 128 bytes of RAM, and a 24MHz operating frequency. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and production requirements. The part operates within a 4V to 5.5V supply range and includes integrated UART/USART connectivity and watchdog timer peripherals.

Substiute Parts

AT89S51-24PI

Microchip TechnologyIn Stock: 1830AT89S51-24PI Datasheet

Current PartRFQ

AT89S51-24PU

Microchip TechnologyIn Stock: 11094AT89S51-24PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89S51-24PI is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051-based processor
• Memory Configuration: 4KB FLASH program memory, 128 x 8 RAM
• Clock Speed: 24MHz operation
• Electrical Specifications: 4V to 5.5V supply voltage range
• I/O Count: 32 I/O pins
• Peripheral Set: UART/USART and watchdog timer
• Physical Form Factor: 40-DIP package with 0.600" (15.24mm) pitch
• Thermal Range: -40°C to 85°C operating temperature

The AT89S51-24PU meets all these criteria and is therefore a direct functional equivalent. The primary distinction between these parts is packaging format and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The AT89S51-24PU is the direct equivalent for the AT89S51-24PI. Both parts share identical electrical and functional specifications across all critical parameters. The AT89S51-24PU is preferred for new designs and ongoing production due to its active product status and ROHS3 compliance. The AT89S51-24PI, classified as obsolete, should be replaced with the AT89S51-24PU in applications where component availability and regulatory compliance are considerations. Both parts are pin-compatible and functionally interchangeable within the 40-DIP form factor.

Frequently Asked Questions (FAQ)

Q: Are AT89S51-24PI and AT89S51-24PU pin-compatible?

A: Yes. Both parts use the 40-DIP package with identical pin assignments and electrical characteristics. Direct socket substitution is possible.

Q: What is the primary difference between these two parts?

A: The AT89S51-24PU is in active production status with ROHS3 compliance, while the AT89S51-24PI is obsolete and RoHS non-compliant. All functional and electrical parameters are identical.

Q: Can I use AT89S51-24PU in place of AT89S51-24PI in existing designs?

A: Yes. The AT89S51-24PU is a direct functional replacement. No circuit modifications are required.

Q: What packaging formats are available for these parts?

A: The AT89S51-24PI is supplied in standard DIP packaging. The AT89S51-24PU is supplied in tube packaging. Both use the 40-DIP form factor.

Q: Are there any compliance differences between these parts?

A: The AT89S51-24PU meets ROHS3 compliance requirements, while the AT89S51-24PI does not. Both are REACH Unaffected and classified under ECCN EAR99.

Q: What is the operating temperature range for both parts?

A: Both the AT89S51-24PI and AT89S51-24PU operate across -40°C to 85°C (TA).