AT87F55WD-24PC Equivalent & Substitute Parts

Part Overview

The AT87F55WD-24PC is an 8051-based 8-bit microcontroller manufactured by Microchip Technology, featuring 20KB OTP Quick FLASH program memory and 256 x 8 bytes of RAM. This device operates at 24MHz with a 40-PDIP through-hole package and supports UART/USART connectivity with watchdog timer peripherals. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	24MHz
Program Memory Size	20KB (20K x 8)
Program Memory Type	OTP Quick FLASH
RAM Size	256 x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	4V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the AT87F55WD-24PC is determined by the following critical parameters: 8051 core processor architecture, 8-bit core size, 40-PDIP package format, through-hole mounting compatibility, and operating voltage range of 4V to 5.5V. The substitute parts DS89C430-MNG+, DS89C430-MNL+, and DS89C450-MNL+ maintain full compatibility with these core requirements. All substitute devices operate on the same 8051 instruction set, support identical I/O pin count (32 pins), and utilize the same 40-DIP physical package. Program memory capacity and speed variations among substitutes do not affect pin-level compatibility or core functionality, allowing selection based on specific application requirements for memory density and processing speed.

Parameter Comparison

Parameter	AT87F55WD-24PC	DS89C430-MNG+	DS89C430-MNL+	DS89C450-MNL+
Manufacturer	Microchip Technology	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Core Processor	8051	8051	8051	8051
Core Size	8-Bit	8-Bit	8-Bit	8-Bit
Speed	24MHz	25MHz	33MHz	33MHz
Program Memory Size	20KB (20K x 8)	16KB (16K x 8)	16KB (16K x 8)	64KB (64K x 8)
Program Memory Type	OTP Quick FLASH	FLASH	FLASH	FLASH
RAM Size	256 x 8	1K x 8	1K x 8	1K x 8
Number of I/O	32	32	32	32
Voltage Supply (Vcc/Vdd)	4V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DS89C430-MNL+ and DS89C450-MNL+ are preferred substitutes due to active product status and ROHS3 compliance. DS89C430-MNL+ maintains 16KB program memory capacity comparable to the original AT87F55WD-24PC specification and operates at 33MHz, providing performance headroom. DS89C450-MNL+ offers expanded 64KB program memory capacity for applications requiring larger code storage while maintaining identical pin compatibility and electrical characteristics. DS89C430-MNG+ provides an alternative with 25MHz operation and obsolete product status classification. All three substitute devices support extended operating temperature range (-40°C to 85°C) compared to the original part (0°C to 70°C), enabling deployment in broader environmental conditions. Voltage supply range for substitutes begins at 4.5V minimum, requiring verification that system power supplies meet this specification if the original design operated below 4.5V.

Frequently Asked Questions (FAQ)

Q: Are DS89C430-MNG+, DS89C430-MNL+, and DS89C450-MNL+ pin-compatible with AT87F55WD-24PC?

A: Yes. All substitute parts use the 40-DIP package with identical pin count (32 I/O pins) and through-hole mounting configuration. Pin assignments are compatible with the 8051 instruction set architecture.

Q: What is the difference between DS89C430-MNL+ and DS89C450-MNL+?

A: Both devices operate at 33MHz with ROHS3 compliance and active product status. The primary difference is program memory capacity: DS89C430-MNL+ provides 16KB FLASH, while DS89C450-MNL+ provides 64KB FLASH. Selection depends on application code size requirements.

Q: Can I use DS89C430-MNG+ as a direct replacement?

A: DS89C430-MNG+ is electrically compatible and pin-compatible but carries obsolete product status. DS89C430-MNL+ and DS89C450-MNL+ are recommended for new designs due to active product status and ROHS3 compliance.

Q: What is the minimum supply voltage for substitute parts?

A: Substitute parts require 4.5V to 5.5V supply voltage. The original AT87F55WD-24PC operates at 4V to 5.5V. Verify system power supply specifications if designs operate below 4.5V.

Q: Do substitute parts support the same operating temperature range?

A: No. The original AT87F55WD-24PC operates at 0°C to 70°C. All substitute parts operate at -40°C to 85°C, providing extended temperature capability suitable for industrial and automotive applications.

Q: Are substitute parts RoHS compliant?

A: Yes. DS89C430-MNG+, DS89C430-MNL+, and DS89C450-MNL+ are ROHS3 compliant. The original AT87F55WD-24PC is RoHS non-compliant.

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