AT89S52-24PI Equivalent & Substitute Parts

Part Overview

The AT89S52-24PI is an 8-bit microcontroller based on the 8051 core architecture, manufactured by Microchip Technology. It features 8KB of FLASH program memory, 256 bytes of RAM, and operates at 24MHz with a 40-pin DIP package. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	24MHz
Program Memory Size	8KB (8K x 8)
Program Memory Type	FLASH
RAM Size	256 x 8
Voltage Supply (Vcc/Vdd)	4V ~ 5.5V
Number of I/O	32
Connectivity	UART/USART
Peripherals	WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)

Substitute Part Grouping Explanation

Substitution of the AT89S52-24PI is determined by compatibility across the following critical parameters:

Core Architecture Compatibility: All substitute parts must use the 8051 or 8052 core processor to maintain instruction set compatibility and firmware portability.

Package Compatibility: All substitutes must use the 40-DIP package to ensure mechanical and electrical pin compatibility without PCB redesign.

Voltage Supply Range: Substitute parts must support the 4V to 5.5V supply range or a range that encompasses it.

I/O Count: All substitutes must provide a minimum of 32 I/O pins to maintain functional equivalence.

Operating Temperature Range: Substitute parts must support the -40°C to 85°C operating temperature range.

Memory Architecture: While program memory size may vary (8KB, 16KB, or 64KB), all substitutes must use FLASH memory type and maintain RAM compatibility with the 8051/8052 architecture.

Substitutes are grouped into two categories: direct equivalents (same memory size and speed) and functional upgrades (enhanced memory or speed specifications).

Parameter Comparison

Parameter	AT89S52-24PI	AT89S52-24PU	DS89C430-MNG+	DS89C430-MNL+	DS89C450-MNL+	W78E516DDG
Manufacturer	Microchip Technology	Microchip Technology	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Nuvoton Technology Corporation
Core Processor	8051	8051	8051	8051	8051	8052
Speed (MHz)	24	24	25	33	33	40
Program Memory Size	8KB (8K x 8)	8KB (8K x 8)	16KB (16K x 8)	16KB (16K x 8)	64KB (64K x 8)	64KB (64K x 8)
RAM Size	256 x 8	256 x 8	1K x 8	1K x 8	1K x 8	512 x 8
Voltage Supply (Vcc/Vdd)	4V ~ 5.5V	4V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	2.4V ~ 5.5V
Number of I/O	32	32	32	32	32	32
Connectivity	UART/USART	UART/USART	EBI/EMI, SIO, UART/USART	EBI/EMI, SIO, UART/USART	EBI/EMI, SIO, UART/USART	EBI/EMI, UART/USART
Peripherals	WDT	WDT	Power-Fail Reset, WDT	Power-Fail Reset, WDT	Power-Fail Reset, WDT	POR, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	40-DIP
Product Status	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): AT89S52-24PU is the direct equivalent to AT89S52-24PI. Both parts share identical electrical specifications, memory configuration, and speed. The primary distinction is product status: AT89S52-24PU is active with ROHS3 compliance, whereas AT89S52-24PI is obsolete and RoHS non-compliant. AT89S52-24PU is available in higher inventory (10,850 units) and is verified as programmable through DiGi-Electronics channels.

Functional Upgrades with Enhanced Memory: DS89C430-MNG+ and DS89C430-MNL+ provide doubled program memory (16KB) while maintaining the 8051 core architecture and 40-DIP package. DS89C430-MNL+ operates at 33MHz (versus 24MHz) and is currently active. These parts are suitable for applications requiring expanded code space without PCB redesign.

Maximum Performance Upgrade: DS89C450-MNL+ and W78E516DDG offer the highest performance specifications with 64KB program memory and speeds of 33MHz and 40MHz respectively. Both maintain 40-DIP package compatibility and 32 I/O pins. W78E516DDG uses the 8052 core (enhanced instruction set) and supports a lower minimum voltage (2.4V). DS89C450-MNL+ is currently active with ROHS3 compliance.

Compliance Consideration: All substitute parts except AT89S52-24PI are ROHS3 compliant. For new designs or production requiring regulatory compliance, AT89S52-24PU, DS89C430-MNL+, DS89C450-MNL+, or W78E516DDG are appropriate selections.

Frequently Asked Questions (FAQ)

Q: Can AT89S52-24PU be used as a direct replacement for AT89S52-24PI without firmware changes? A: Yes. AT89S52-24PU is electrically and functionally identical to AT89S52-24PI. Both use the 8051 core, operate at 24MHz, contain 8KB FLASH memory, and use the 40-DIP package. No firmware modification is required.

Q: What is the difference between AT89S52-24PU and DS89C430-MNL+? A: DS89C430-MNL+ provides doubled program memory (16KB versus 8KB) and higher clock speed (33MHz versus 24MHz). Both maintain the 8051 core and 40-DIP package. DS89C430-MNL+ is suitable for applications requiring larger code space or faster execution. Firmware must be compatible with the 8051 instruction set.

Q: Is the W78E516DDG compatible with existing AT89S52-24PI firmware? A: W78E516DDG uses the 8052 core, which is an enhanced version of the 8051 with additional instructions. Existing 8051 firmware will execute on the 8052 core. However, the W78E516DDG operates at 40MHz (versus 24MHz) and has different memory organization (512 x 8 RAM versus 256 x 8). Timing-sensitive code may require adjustment.

Q: Can I use a substitute part with higher program memory in a design originally using AT89S52-24PI? A: Yes, provided the substitute maintains the 40-DIP package and 8051/8052 core compatibility. Higher memory capacity is backward compatible. However, the application firmware must be designed to utilize the additional memory space. No PCB redesign is required for package-compatible substitutes.

Q: What is the minimum voltage requirement for each substitute? A: AT89S52-24PI and AT89S52-24PU require 4V minimum. DS89C430-MNG+, DS89C430-MNL+, and DS89C450-MNL+ require 4.5V minimum. W78E516DDG has the lowest requirement at 2.4V minimum, providing greater flexibility for low-voltage applications.

Q: Are all substitute parts available in the same packaging format? A: All substitute parts use the 40-DIP package, ensuring mechanical and electrical pin compatibility. Packaging materials (tube, tray, etc.) may vary by supplier and part number suffix, but the physical package dimensions remain consistent at 0.600" (15.24mm) width.

Q: Which substitute offers the best compliance for new production? A: AT89S52-24PU, DS89C430-MNL+, DS89C450-MNL+, and W78E516DDG are all ROHS3 compliant. For new designs requiring regulatory compliance, any of these four parts are appropriate. AT89S52-24PU is the direct equivalent with the lowest design risk.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message