AT89S8253-24PC Equivalent & Substitute Parts

Part Overview

The AT89S8253-24PC is an 8-bit microcontroller from Microchip Technology's 89S series, featuring 12KB of FLASH program memory, 2KB EEPROM, and 256 bytes of RAM. This device operates at 24MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as Power-On Reset (POR), Watchdog Timer (WDT), SPI, and UART/USART connectivity. The AT89S8253-24PC is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring this microcontroller architecture.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	24MHz
Program Memory Size	12KB (12K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	256 x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	32
Connectivity	SPI, UART/USART
Peripherals	POR, WDT
Mounting Type	Through Hole
Package	40-DIP (0.600", 15.24mm)

Substitute Part Grouping Explanation

Substitution of the AT89S8253-24PC is determined by strict equivalence across the following critical parameters:

Core Architecture: 8051-based processor with identical instruction set compatibility
Memory Configuration: 12KB FLASH program memory, 2KB EEPROM, and 256 bytes RAM
Operating Frequency: 24MHz clock speed
Supply Voltage Range: 2.7V to 5.5V
I/O Count: 32 I/O pins
Connectivity Interfaces: SPI and UART/USART protocols
Integrated Peripherals: Power-On Reset and Watchdog Timer
Package Type: 40-pin DIP form factor with 0.600" (15.24mm) pitch

The AT89S8253-24PU qualifies as a direct substitute based on identical electrical specifications, memory configuration, and pinout compatibility. Differences in product status, operating temperature range, and packaging format do not affect functional interchangeability in applications designed for the AT89S8253-24PC.

Parameter Comparison

Parameter	AT89S8253-24PC	AT89S8253-24PU
Manufacturer	Microchip Technology	Microchip Technology
Series	89S	89S
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	24MHz	24MHz
Program Memory Size	12KB (12K x 8)	12KB (12K x 8)
Program Memory Type	FLASH	FLASH
EEPROM Size	2K x 8	2K x 8
RAM Size	256 x 8	256 x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V
Number of I/O	32	32
Connectivity	SPI, UART/USART	SPI, UART/USART
Peripherals	POR, WDT	POR, WDT
Mounting Type	Through Hole	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)
Product Status	Obsolete	Active
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT89S8253-24PU is the direct functional equivalent for applications currently using the AT89S8253-24PC. Selection between these parts should be based on the following criteria:

AT89S8253-24PC: Use only when legacy inventory must be depleted or when existing stock is available. This part is obsolete and no longer manufactured.

AT89S8253-24PU: Recommended for all new designs and ongoing production. This part is in active production status, offers extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), and meets ROHS3 compliance requirements. The AT89S8253-24PU provides superior long-term availability and regulatory compliance for applications requiring RoHS certification.

Both parts share identical electrical and functional specifications, ensuring direct pin-for-pin and code-level compatibility. The choice between them is determined by product lifecycle requirements and compliance mandates rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the AT89S8253-24PU directly replace the AT89S8253-24PC in existing designs?

A: Yes. Both parts are functionally identical with matching core processor architecture, memory configuration, clock speed, I/O count, and peripheral set. Pin assignments and electrical characteristics are identical, enabling direct substitution without circuit modification.

Q: What is the difference in operating temperature range between these parts?

A: The AT89S8253-24PC operates from 0°C to 70°C, while the AT89S8253-24PU operates from -40°C to 85°C. For applications requiring extended temperature operation, the AT89S8253-24PU provides broader environmental capability.

Q: Are there packaging differences between the AT89S8253-24PC and AT89S8253-24PU?

A: Both parts use identical 40-pin DIP packaging with 0.600" (15.24mm) pitch. The primary packaging difference is the supplier format: AT89S8253-24PC uses standard DIP packaging, while AT89S8253-24PU is supplied in tube packaging. This does not affect electrical or mechanical compatibility.

Q: What is the significance of the RoHS compliance difference?

A: The AT89S8253-24PC is RoHS non-compliant, while the AT89S8253-24PU meets ROHS3 standards. For applications subject to RoHS regulations or customer requirements, the AT89S8253-24PU is the appropriate selection.

Q: Why is the AT89S8253-24PC classified as obsolete?

A: Microchip Technology has discontinued manufacturing the AT89S8253-24PC. The AT89S8253-24PU remains in active production as the current equivalent part. For long-term supply chain stability, the AT89S8253-24PU should be specified in new designs.

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