P87LPC768FD,512 Equivalent & Substitute Parts

Part Overview

The P87LPC768FD,512 is an 8051-based 8-bit microcontroller manufactured by NXP USA Inc., featuring 4KB OTP program memory, 128 bytes of RAM, and integrated peripherals including PWM, watchdog timer, and brown-out detection. Designed for embedded applications requiring low-power operation across a 2.7V to 6V supply range, this device operates at up to 20MHz with 18 I/O pins in a 20-SOIC package.

The P87LPC768FD,512 is classified as obsolete. Finding equivalent substitute parts is necessary to support legacy system maintenance, design updates, and continued production of devices utilizing this microcontroller.

Substiute Parts

P87LPC768FD,512

NXP USA Inc.In Stock: 863P87LPC768FD,512 Datasheet

Current PartRFQ

W79E8213ASG

Nuvoton Technology CorporationIn Stock: 806W79E8213ASG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P87LPC768FD,512 is determined by the following critical parameters:

Core Architecture & Performance: Both the main part and substitute must utilize the 8051 core processor architecture, operate at 20MHz, and maintain 8-bit processing capability to ensure firmware compatibility and performance equivalence.

Memory Configuration: Program memory must be 4KB (4K x 8) to accommodate existing firmware. RAM must be 128 x 8 bytes. While the main part uses OTP (One-Time Programmable) memory and the substitute uses FLASH, both configurations support the same memory footprint required for application code.

I/O & Peripheral Count: 18 I/O pins are required to maintain pin-to-pin compatibility with existing PCB designs and application requirements.

Electrical Specifications: Operating voltage range and temperature range must support the application environment. The substitute's voltage range (2.4V ~ 5.5V) is compatible with systems designed for the main part's 2.7V ~ 6V range.

Package & Mounting: 20-SOIC package with identical physical dimensions (0.295", 7.50mm Width) ensures direct PCB compatibility without layout modifications.

The W79E8213ASG meets all substitution criteria based on these parameters.

Parameter Comparison

Engineering Selection Recommendations

The W79E8213ASG is a direct functional substitute for the P87LPC768FD,512 based on the following engineering criteria:

Architecture Compatibility: Both devices implement the 8051 core processor at identical clock speed (20MHz), ensuring firmware compatibility without modification. Existing 8051 assembly code and C-based applications compiled for the P87LPC768FD,512 will execute on the W79E8213ASG.

Memory Equivalence: Identical program memory size (4KB) and RAM configuration (128 x 8) support the same application code footprint. The substitution from OTP to FLASH memory is functionally transparent at the application level and provides the additional benefit of in-system reprogrammability.

Electrical & Environmental Compliance: Both devices meet ROHS3 compliance and operate across overlapping temperature ranges (-40°C ~ 85°C). The W79E8213ASG voltage range (2.4V ~ 5.5V) encompasses the critical operating window of the original part (2.7V ~ 6V) for standard embedded applications.

Physical & Electrical Pinout: Identical 20-SOIC package dimensions and 18 I/O pin configuration enable direct PCB replacement without layout modifications or pin reassignment.

Product Availability: The W79E8213ASG is in active production status, ensuring long-term availability and supply chain continuity compared to the obsolete P87LPC768FD,512.

Frequently Asked Questions (FAQ)

Q: Can the W79E8213ASG be used as a direct replacement without firmware changes?

A: Yes. Both devices use the 8051 core processor architecture operating at 20MHz with identical memory configuration (4KB program, 128 bytes RAM) and I/O count (18 pins). Existing firmware compiled for the P87LPC768FD,512 will execute on the W79E8213ASG without modification.

Q: What is the difference between OTP and FLASH memory in this substitution?

A: The P87LPC768FD,512 uses OTP (One-Time Programmable) memory, which can be programmed once during manufacturing. The W79E8213ASG uses FLASH memory, which supports multiple erase-write cycles. At the application level, both provide the same 4KB program storage. FLASH offers the advantage of in-system reprogrammability for development and field updates.

Q: Are there voltage supply differences I need to consider?

A: The P87LPC768FD,512 operates at 2.7V ~ 6V, while the W79E8213ASG operates at 2.4V ~ 5.5V. For applications designed within the 2.7V ~ 5.5V window, the substitute is fully compatible. Applications requiring operation above 5.5V would require design review.

Q: Is the package footprint identical?

A: Yes. Both devices use the 20-SOIC package with identical physical dimensions (0.295" width, 7.50mm). The W79E8213ASG can be soldered directly to PCBs designed for the P87LPC768FD,512 without layout modifications.

Q: What about the enhanced ADC in the W79E8213ASG?

A: The W79E8213ASG features an 8-channel 10-bit ADC compared to the P87LPC768FD,512's 4-channel 8-bit ADC. This enhancement is backward compatible; applications using the original 4-channel 8-bit ADC will function identically on the substitute. The additional ADC capability is available for new feature implementation if required.

Q: Are both devices RoHS compliant?

A: Yes. Both the P87LPC768FD,512 and W79E8213ASG are ROHS3 compliant, meeting environmental and regulatory requirements for electronic components.

Q: What is the inventory status for the substitute part?

A: The W79E8213ASG is in active production with 725 pieces in stock as new original inventory, ensuring availability for immediate procurement and ongoing supply chain support.