P89V51RB2FN,112 Equivalent & Substitute Parts

Part Overview

The P89V51RB2FN,112 is an 8051-based 8-bit microcontroller manufactured by NXP USA Inc., featuring 16KB FLASH program memory, 1KB RAM, and 32 I/O pins in a 40-DIP package. This part operates at 40MHz with a supply voltage range of 4.5V to 5.5V and includes integrated peripherals such as Brown-out Detect/Reset, POR, PWM, and WDT. 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	40MHz
Program Memory Type	FLASH
Program Memory Size	16KB (16K x 8)
RAM Size	1K x 8
Number of I/O	32
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Connectivity	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the P89V51RB2FN,112 is determined by the following critical parameters:

Core Processor Architecture: 8051-compatible processor required for firmware compatibility
Package Type: 40-DIP form factor for PCB layout compatibility
Program Memory Type and Size: FLASH memory with minimum 16KB capacity
I/O Pin Count: Minimum 32 I/O pins to maintain interface compatibility
Supply Voltage Range: Must encompass or be compatible with 4.5V ~ 5.5V operating range
Operating Temperature Range: Must support -40°C ~ 85°C minimum
Mounting Type: Through Hole configuration for existing PCB designs

Three substitute parts meet these criteria with varying performance characteristics and memory configurations.

Parameter Comparison

Parameter	P89V51RB2FN,112 (Main)	AT89C51RB2-3CSUM	AT89LP51RB2-20PU	DS87C520-MCL+
Manufacturer	NXP USA Inc.	Microchip Technology	Microchip Technology	Analog Devices Inc./Maxim Integrated
Core Processor	8051	80C51	8051	8051
Speed	40MHz	60MHz	20MHz	33MHz
Program Memory Type	FLASH	FLASH	FLASH	OTP
Program Memory Size	16KB (16K x 8)	16KB (16K x 8)	24KB (24K x 8)	16KB (16K x 8)
RAM Size	1K x 8	1.25K x 8	1.375K x 8	1K x 8
Number of I/O	32	32	37	32
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V	2.7V ~ 5.5V	2.4V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	0°C ~ 70°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
Connectivity	SPI, UART/USART	SPI, UART/USART	EBI/EMI, I2C, SPI, UART/USART	EBI/EMI, SIO, UART/USART
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT89C51RB2-3CSUM is the closest functional equivalent to the P89V51RB2FN,112. It maintains identical program memory capacity (16KB FLASH), I/O pin count (32), and package form factor (40-DIP). The AT89C51RB2-3CSUM operates at a higher clock speed (60MHz versus 40MHz) and supports a wider supply voltage range (2.7V ~ 5.5V). Product status is Active with ROHS3 compliance. This part is suitable for direct replacement in applications where the increased processing speed does not introduce timing conflicts.

AT89LP51RB2-20PU provides expanded program memory (24KB FLASH) and additional I/O pins (37 versus 32), along with enhanced connectivity options including I2C and EBI/EMI interfaces. Operating temperature range matches the main part (-40°C ~ 85°C). The reduced clock speed (20MHz) requires timing verification in speed-critical applications. Product status is Active with ROHS3 compliance. This part is appropriate for designs requiring additional memory or I/O expansion.

DS87C520-MCL+ maintains identical program memory size (16KB) and I/O pin count (32) but uses OTP (One-Time Programmable) memory instead of FLASH. Operating temperature range is restricted to 0°C ~ 70°C, which does not cover the full -40°C specification of the main part. Product status is Active with ROHS3 compliance. This part is suitable only for applications operating within the 0°C ~ 70°C temperature window and where OTP memory is acceptable.

Frequently Asked Questions (FAQ)

Q: Can AT89C51RB2-3CSUM be used as a direct drop-in replacement?

A: Yes, for most applications. The AT89C51RB2-3CSUM shares the same 40-DIP package, 16KB FLASH memory, 32 I/O pins, and -40°C ~ 85°C operating temperature range. The higher clock speed (60MHz versus 40MHz) is backward compatible. Verify that the wider supply voltage range (2.7V ~ 5.5V) is compatible with your power supply design.

Q: What is the key difference between AT89LP51RB2-20PU and the main part?

A: The AT89LP51RB2-20PU offers 24KB FLASH memory (versus 16KB) and 37 I/O pins (versus 32), providing additional resources for complex applications. The clock speed is reduced to 20MHz. The expanded connectivity (I2C, EBI/EMI) may require firmware modifications if these interfaces are utilized.

Q: Why is DS87C520-MCL+ not recommended for all applications?

A: The DS87C520-MCL+ uses OTP (One-Time Programmable) memory, which cannot be reprogrammed after initial programming. Additionally, the operating temperature range (0°C ~ 70°C) does not extend to -40°C, making it unsuitable for industrial or extended temperature applications. Use this part only when OTP memory is acceptable and operating conditions remain within 0°C ~ 70°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The P89V51RB2FN,112 and all three substitute parts (AT89C51RB2-3CSUM, AT89LP51RB2-20PU, and DS87C520-MCL+) are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the impact of different supply voltage ranges?

A: The main part operates at 4.5V ~ 5.5V. AT89C51RB2-3CSUM and AT89LP51RB2-20PU support lower minimum voltages (2.7V and 2.4V respectively), allowing operation in low-power applications. DS87C520-MCL+ maintains the same 4.5V ~ 5.5V range. Verify your power supply design is compatible with the selected substitute.

Q: Can firmware be transferred between these parts without modification?

A: Firmware compatibility depends on the specific application. All parts use 8051-compatible architectures and support the same core instruction set. However, differences in clock speed, memory size, and peripheral configurations may require timing adjustments or code modifications. Comprehensive testing is required before production deployment.

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