P89V51RC2FN,112 Equivalent & Substitute Parts

Part Overview

The P89V51RC2FN,112 is an 8051-based 8-bit microcontroller manufactured by NXP USA Inc., featuring 32KB FLASH program memory, 1KB RAM, and a 40MHz operating frequency. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and new production requirements. The part operates within a 4.5V to 5.5V supply range and includes integrated peripherals such as UART/USART, SPI connectivity, brown-out detection, power-on reset, PWM, and watchdog timer functionality.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Program Memory Size	32KB (32K x 8)
Program Memory Type	FLASH
RAM Size	1K x 8
Speed	40MHz
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	32
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the P89V51RC2FN,112 is determined by the following critical parameters:

Core Processor Architecture: 8051-compatible instruction set
Program Memory: Minimum 32KB FLASH capacity
Package Type: 40-DIP form factor with 0.600" (15.24mm) pitch
Mounting: Through-hole technology
Supply Voltage Range: Compatibility with 4.5V ~ 5.5V operation
I/O Count: Minimum 32 I/O pins
Operating Temperature: -40°C ~ 85°C range

The three substitute parts identified meet these core substitution criteria while offering varying performance characteristics and enhanced feature sets suitable for different application requirements.

Parameter Comparison

Parameter	P89V51RC2FN,112 (Main)	AT89C51RC2-3CSUM	AT89C55WD-24PU	AT89LP51RC2-20PU
Manufacturer	NXP USA Inc.	Microchip Technology	Microchip Technology	Microchip Technology
Core Processor	8051	80C51	8051	8051
Core Size	8-Bit	8-Bit	8-Bit	8-Bit
Speed	40MHz	60MHz	24MHz	20MHz
Program Memory Size	32KB (32K x 8)	32KB (32K x 8)	20KB (20K x 8)	32KB (32K x 8)
Program Memory Type	FLASH	FLASH	FLASH	FLASH
RAM Size	1K x 8	1.25K x 8	256 x 8	1.375K x 8
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V	2.7V ~ 5.5V	4.5V ~ 5.5V	2.4V ~ 5.5V
Number of I/O	32	32	32	37
Connectivity	SPI, UART/USART	SPI, UART/USART	UART/USART	EBI/EMI, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	POR, PWM, WDT	WDT	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
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)
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT89C51RC2-3CSUM is suitable for applications requiring higher processing speed (60MHz) while maintaining 32KB program memory and 32 I/O pins. This part offers enhanced performance over the original P89V51RC2FN,112 and supports an extended supply voltage range (2.7V ~ 5.5V). Product status is active with ROHS3 compliance.

AT89C55WD-24PU is applicable for designs with reduced program memory requirements (20KB FLASH) and lower speed operation (24MHz). This part maintains the 32 I/O pin count and 4.5V ~ 5.5V supply compatibility. However, RAM capacity is reduced to 256 x 8 bytes, and peripheral integration is minimal (WDT only). Product status is active with ROHS3 compliance.

AT89LP51RC2-20PU provides the closest functional equivalence to the P89V51RC2FN,112, offering 32KB program memory, enhanced I/O capability (37 pins), and extended supply voltage range (2.4V ~ 5.5V). This part includes additional connectivity options (EBI/EMI, I2C) and analog-to-digital conversion capability (7x10-bit). Product status is active with ROHS3 compliance.

All substitute parts maintain through-hole 40-DIP packaging, -40°C to 85°C operating temperature range, and regulatory compliance (ROHS3, REACH Unaffected, ECCN classification).

Frequently Asked Questions (FAQ)

Q: Can AT89C55WD-24PU replace P89V51RC2FN,112 in all applications?

A: AT89C55WD-24PU is not a direct replacement for all applications. While it maintains 32 I/O pins and 40-DIP packaging, it provides only 20KB program memory compared to the 32KB of the original part. Applications requiring the full 32KB memory capacity cannot use this substitute without firmware modification.

Q: What is the primary advantage of AT89C51RC2-3CSUM over the original P89V51RC2FN,112?

A: AT89C51RC2-3CSUM operates at 60MHz compared to 40MHz in the original part, providing 50% higher processing speed. It also supports a wider supply voltage range (2.7V ~ 5.5V) and maintains equivalent program memory (32KB) and I/O count (32 pins).

Q: Does AT89LP51RC2-20PU offer additional features compared to P89V51RC2FN,112?

A: Yes. AT89LP51RC2-20PU includes additional connectivity interfaces (EBI/EMI, I2C), analog-to-digital conversion (7x10-bit), and 37 I/O pins versus 32 in the original part. It also supports a lower minimum supply voltage (2.4V versus 4.5V).

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use 40-DIP packaging with 0.600" (15.24mm) pitch, matching the original P89V51RC2FN,112 form factor for direct socket compatibility.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected. Regulatory classifications (ECCN, HTSUS) are provided for each part number to support procurement and export documentation requirements.

Q: Can firmware developed for P89V51RC2FN,112 run on AT89C55WD-24PU without modification?

A: Firmware compatibility depends on program memory utilization. Since AT89C55WD-24PU provides only 20KB program memory versus 32KB in the original part, applications exceeding 20KB require code optimization or cannot be ported without modification.

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