P87C52X2FN,112 Equivalent & Substitute Parts

Part Overview

The P87C52X2FN,112 is an 8051-based 8-bit microcontroller manufactured by NXP Semiconductors, featuring 8KB OTP program memory and 256 bytes of RAM in a 40-DIP package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where 8051 architecture compatibility is required.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	33MHz
Program Memory Size	8KB (8K x 8)
Program Memory Type	OTP
RAM Size	256 x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package Type	40-DIP
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the P87C52X2FN,112 is determined by the following critical parameters:

Core Architecture: 8051 processor compatibility
Package Format: 40-DIP through-hole mounting
Operating Voltage Range: Supply voltage compatibility (2.7V ~ 5.5V for the original part)
I/O Count: 32 I/O pins
Operating Temperature Range: -40°C ~ 85°C
Program Memory Type: OTP (One-Time Programmable)

The DS87C520-MNL+ qualifies as a manufacturer-recommended substitute based on matching core architecture, package type, I/O count, and temperature range. However, differences in program memory size (16KB vs. 8KB), RAM capacity (1K x 8 vs. 256 x 8), voltage supply range (4.5V ~ 5.5V vs. 2.7V ~ 5.5V), and oscillator type must be evaluated for specific application requirements.

Parameter Comparison

Parameter	P87C52X2FN,112	DS87C520-MNL+
Manufacturer	NXP Semiconductors	Analog Devices Inc./Maxim Integrated
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	33MHz	33MHz
Program Memory Size	8KB (8K x 8)	16KB (16K x 8)
Program Memory Type	OTP	OTP
RAM Size	256 x 8	1K x 8
Number of I/O	32	32
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package Type	40-DIP	40-PDIP
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The DS87C520-MNL+ is the manufacturer-recommended substitute for the P87C52X2FN,112. Selection of this substitute is supported by:

Active Product Status: The DS87C520-MNL+ maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete P87C52X2FN,112.
Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.
Core Compatibility: Identical 8051 architecture, clock speed (33MHz), I/O count (32), and operating temperature range (-40°C ~ 85°C) ensure functional compatibility at the processor level.
Package Compatibility: Both devices use 40-DIP through-hole packaging, enabling direct socket replacement in existing PCB designs.

Substitution requires verification of application-specific requirements regarding program memory capacity (16KB vs. 8KB), RAM size (1K x 8 vs. 256 x 8), minimum supply voltage (4.5V vs. 2.7V), and oscillator configuration (external vs. internal).

Frequently Asked Questions (FAQ)

Q: Can the DS87C520-MNL+ directly replace the P87C52X2FN,112 in existing designs?

A: Direct socket replacement is possible due to identical 40-DIP package format and pin count. However, application firmware and power supply specifications must be evaluated. The DS87C520-MNL+ requires a minimum supply voltage of 4.5V, whereas the P87C52X2FN,112 operates from 2.7V. Applications using lower supply voltages require redesign.

Q: What are the key differences between these two microcontrollers?

A: The primary differences are program memory capacity (P87C52X2FN,112: 8KB; DS87C520-MNL+: 16KB), RAM size (P87C52X2FN,112: 256 x 8; DS87C520-MNL+: 1K x 8), minimum supply voltage (P87C52X2FN,112: 2.7V; DS87C520-MNL+: 4.5V), and oscillator type (P87C52X2FN,112: internal; DS87C520-MNL+: external). Both share identical core architecture, clock speed, I/O count, and operating temperature range.

Q: Is the DS87C520-MNL+ suitable for low-voltage applications?

A: No. The DS87C520-MNL+ has a minimum supply voltage of 4.5V and is not suitable for applications requiring operation below this threshold. The P87C52X2FN,112 supports operation from 2.7V. Alternative substitutes must be identified for low-voltage applications.

Q: What is the significance of the external oscillator requirement in the DS87C520-MNL+?

A: The DS87C520-MNL+ requires an external oscillator, whereas the P87C52X2FN,112 features an internal oscillator. This difference affects PCB layout, component count, and design complexity. Applications must provide external clock generation circuitry when using the DS87C520-MNL+.

Q: Are both devices RoHS compliant?

A: Yes. Both the P87C52X2FN,112 and DS87C520-MNL+ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

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