AT89LS8252-12PI Equivalent & Substitute Parts

Part Overview

The AT89LS8252-12PI is an 8051-based 8-bit microcontroller manufactured by Microchip Technology, featuring 8KB of FLASH program memory and operating at 12MHz. This device is classified as obsolete, which necessitates identification of functionally compatible alternatives for new designs and production continuity. The part is available in 40-PDIP through-hole packaging with a supply voltage range of 2.7V to 6V and includes standard peripherals such as Power-On Reset (POR) and Watchdog Timer (WDT).

Key Parameters

Parameter	AT89LS8252-12PI
Core Processor	8051
Core Size	8-Bit
Speed	12MHz
Program Memory Size	8KB (8K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	256 x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 6V
Number of I/O	32
Connectivity	SPI, UART/USART
Peripherals	POR, WDT
Operating Temperature	-40°C ~ 85°C
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT89LS8252-12PI is determined by the following critical parameters:

Core Architecture Compatibility: Both the main part and substitute must utilize the 8051 core processor architecture to ensure firmware compatibility without modification.

Package and Pinout: The 40-DIP through-hole package with identical mechanical dimensions (0.600", 15.24mm) is mandatory for direct board-level replacement.

Memory Configuration: While the substitute may feature increased program memory capacity, the EEPROM and RAM sizes must remain compatible with the application requirements.

Voltage Supply Range: The substitute must operate within or encompass the original supply voltage specification to ensure compatibility with existing power delivery systems.

I/O Count and Connectivity: The number of I/O pins and communication interfaces (SPI, UART/USART) must match or exceed the original specification.

Operating Temperature Range: The substitute must support the same or wider operating temperature range (-40°C ~ 85°C).

Parameter Comparison

Parameter	AT89LS8252-12PI	AT89S8253-24PU	Compatibility Notes
Core Processor	8051	8051	Identical architecture
Core Size	8-Bit	8-Bit	Identical
Speed	12MHz	24MHz	Substitute operates at higher frequency; backward compatible
Program Memory Size	8KB (8K x 8)	12KB (12K x 8)	Substitute provides increased capacity
Program Memory Type	FLASH	FLASH	Identical
EEPROM Size	2K x 8	2K x 8	Identical
RAM Size	256 x 8	256 x 8	Identical
Voltage Supply (Vcc/Vdd)	2.7V ~ 6V	2.7V ~ 5.5V	Substitute range is subset of original; compatible within 2.7V ~ 5.5V
Number of I/O	32	32	Identical
Connectivity	SPI, UART/USART	SPI, UART/USART	Identical
Peripherals	POR, WDT	POR, WDT	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	Identical mechanical dimensions
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current environmental standards

Engineering Selection Recommendations

The AT89S8253-24PU is a direct functional substitute for the AT89LS8252-12PI based on the following criteria:

Product Status: The AT89S8253-24PU is classified as active production, ensuring long-term availability and supply chain continuity compared to the obsolete AT89LS8252-12PI.

Compliance and Certifications: The AT89S8253-24PU is ROHS3 compliant, meeting current environmental and regulatory requirements. Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99).

Programmability Verification: The AT89S8253-24PU is verified as programmable through DiGi-Electronics, whereas the AT89LS8252-12PI programmability status is not verified.

Electrical Compatibility: The substitute operates within the voltage range of the original part (2.7V ~ 5.5V is a subset of 2.7V ~ 6V). Applications requiring operation above 5.5V must be evaluated separately.

Performance Enhancement: The AT89S8253-24PU operates at 24MHz compared to the original 12MHz, providing increased processing capability while maintaining full backward compatibility with existing firmware.

Frequently Asked Questions (FAQ)

Q: Can the AT89S8253-24PU be used as a direct replacement for the AT89LS8252-12PI without firmware modification?

A: Yes. Both devices utilize the 8051 core architecture, feature identical I/O counts, connectivity interfaces, and peripheral configurations. The substitute's higher clock speed and increased program memory are backward compatible with applications designed for the original part.

Q: What is the impact of the voltage supply range difference?

A: The AT89S8253-24PU operates within 2.7V ~ 5.5V, which is a subset of the original 2.7V ~ 6V range. Applications operating exclusively within the 2.7V ~ 5.5V window experience no impact. Systems requiring operation above 5.5V must retain the original part or identify alternative solutions.

Q: Are the packages mechanically identical?

A: Yes. Both parts are housed in 40-DIP through-hole packages with identical mechanical dimensions (0.600", 15.24mm), enabling direct board-level substitution without PCB redesign.

Q: What are the advantages of the AT89S8253-24PU over the AT89LS8252-12PI?

A: The substitute offers active production status, ROHS3 compliance, verified programmability, 24MHz operation (double the original speed), and 12KB program memory (50% increase over the original 8KB). These enhancements provide improved performance and regulatory compliance.

Q: Is the increased program memory of the AT89S8253-24PU a concern for compatibility?

A: No. Increased program memory is a superset feature that does not affect compatibility. Existing firmware designed for 8KB will execute identically on the 12KB device.

Q: How do the EEPROM and RAM specifications compare?

A: Both parts feature identical EEPROM (2K x 8) and RAM (256 x 8) configurations, ensuring complete compatibility at the memory architecture level.

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