AT89C52-24PC Equivalent & Substitute Parts

Part Overview

The AT89C52-24PC 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 supply voltage range of 4V to 6V. The device is packaged in a 40-pin DIP configuration with 32 I/O lines and includes UART/USART connectivity.

This part is classified as obsolete. Equivalent and substitute parts are necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

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 ~ 6V
Number of I/O	32
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C52-24PC is determined by the following critical parameters:

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

Package Compatibility: All substitute parts must use the 40-DIP package to ensure mechanical and electrical pin compatibility.

I/O Count: All substitute parts must provide 32 I/O lines to match the original pinout.

Memory Type: All substitute parts must use FLASH program memory.

Voltage Supply Range: Substitute parts must operate within or encompass the 4V to 6V supply range of the original part.

Mounting Type: All substitute parts must use through-hole mounting.

The substitute parts listed below meet these core compatibility criteria. Variations in program memory size (8KB to 64KB), operating speed (24MHz to 40MHz), RAM capacity (256 to 1024 bytes), and operating temperature range represent functional enhancements or extended specifications that do not prevent substitution in applications designed for the AT89C52-24PC.

Parameter Comparison

Parameter	AT89C52-24PC	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
Core Size	8-Bit	8-Bit	8-Bit	8-Bit	8-Bit	8-Bit
Speed	24MHz	24MHz	25MHz	33MHz	33MHz	40MHz
Program Memory Size	8KB	8KB	16KB	16KB	64KB	64KB
Program Memory Type	FLASH	FLASH	FLASH	FLASH	FLASH	FLASH
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 ~ 6V	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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	40-DIP	40-DIP	40-DIP	40-DIP	40-DIP	40-DIP
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
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

AT89S52-24PU is the primary equivalent substitute. It maintains identical speed (24MHz) and program memory capacity (8KB) as the AT89C52-24PC while offering active product status and ROHS3 compliance. The operating temperature range extends to -40°C to 85°C, providing enhanced environmental performance. The voltage supply range narrows to 4V to 5.5V, which remains compatible with the original 4V to 6V specification at the lower end.

DS89C430-MNG+ and DS89C430-MNL+ provide increased program memory (16KB) and enhanced peripheral integration including Power-Fail Reset and Watchdog Timer. DS89C430-MNL+ operates at 33MHz with active product status and ROHS3 compliance. These parts are suitable for applications requiring expanded memory capacity while maintaining 8051 core compatibility.

DS89C450-MNL+ offers maximum program memory capacity (64KB) at 33MHz with active product status and ROHS3 compliance. This part accommodates applications with substantial code storage requirements.

W78E516DDG is manufactured by Nuvoton Technology Corporation and features the 8052 core processor with 64KB program memory and 40MHz operation. The 8052 core includes additional timer functionality compared to the 8051. This part supports the widest voltage supply range (2.4V to 5.5V) and is suitable for low-power applications. Active product status and ROHS3 compliance are confirmed.

For new designs or systems requiring long-term availability, AT89S52-24PU is the recommended choice due to active product status and direct parameter alignment with the AT89C52-24PC.

Frequently Asked Questions (FAQ)

Q: Can AT89S52-24PU directly replace AT89C52-24PC without circuit modifications?

A: Yes. Both parts share identical core processor (8051), speed (24MHz), program memory (8KB), RAM (256 x 8), I/O count (32), and 40-DIP package. The voltage supply range of AT89S52-24PU (4V to 5.5V) is compatible with the original specification (4V to 6V) within the overlapping 4V to 5.5V window. No circuit modifications are required.

Q: What is the difference between 8051 and 8052 core processors?

A: The 8052 core includes an additional timer (Timer 2) compared to the 8051 core. Both cores maintain instruction set compatibility. The W78E516DDG uses the 8052 core and is suitable for applications requiring the additional timer functionality.

Q: Why do some substitute parts have larger program memory than the original AT89C52-24PC?

A: Increased program memory (16KB or 64KB) in substitute parts does not prevent substitution. Applications designed for 8KB memory operate without modification on parts with larger memory capacity. Larger memory accommodates future firmware expansion or more complex application code.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original AT89C52-24PC is RoHS non-compliant. RoHS3 compliance indicates the absence of restricted substances and is required for many modern applications and supply chains.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active product status indicates current manufacturing and long-term availability. Obsolete status indicates discontinued production. For new designs or systems requiring extended support, active parts are preferred. DS89C430-MNG+ is obsolete; DS89C430-MNL+, DS89C450-MNL+, AT89S52-24PU, and W78E516DDG are active.

Q: Can I use W78E516DDG as a substitute if my application uses 8051-specific code?

A: W78E516DDG uses the 8052 core, which is a superset of the 8051 instruction set. Code written for 8051 executes on 8052 without modification. The additional Timer 2 in the 8052 does not interfere with existing 8051 code.

Q: What is the operating temperature range difference, and does it matter?

A: The original AT89C52-24PC operates from 0°C to 70°C. All substitute parts operate from -40°C to 85°C, providing extended temperature performance. Applications operating within the original 0°C to 70°C range are unaffected. Extended range is beneficial for industrial or automotive environments.

Q: Are there connectivity differences between substitute parts?

A: All substitute parts include UART/USART connectivity matching the original AT89C52-24PC. DS89C430-MNG+, DS89C430-MNL+, DS89C450-MNL+, and W78E516DDG include additional EBI/EMI (External Bus Interface/External Memory Interface) connectivity. This enhancement does not affect applications using standard UART communication.

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