NXP Semiconductors LPC1786FBD208,551

Overview

LPC1786FBD208 from NXP Semiconductors is a 32-bit ARM Cortex-M3 microcontroller designed for high-integration embedded systems requiring Ethernet, USB Device/Host/OTG, and LCD support. It operates at up to 120 MHz, integrates 256 kB flash, 80 kB SRAM (64 kB main + 16 kB peripheral), and 4032-byte EEPROM, and delivers real-time control in industrial automation and motor drive applications.

For engineers reviewing the LPC1786FBD208 datasheet, LPC1786FBD208 pinout, LPC1786FBD208 application, or LPC1786FBD208 equivalent, key selection factors include its LQFP208 package with 165 GPIOs, dual CAN channels, 8-channel 12-bit ADC, 10-bit DAC, and Ethernet MAC with MII/RMII - all while maintaining pin compatibility with LPC23xx/LPC24xx families.

Technical Context

The LPC1786FBD208 implements an ARM Cortex-M3 core with 3-stage pipeline, Harvard architecture, and integrated Memory Protection Unit (MPU) supporting eight memory regions. Its multilayer AHB matrix enables concurrent access by CPU, Ethernet, USB, and GPDMA without arbitration delay unless accessing the same slave.

It features dedicated clock domains: one PLL for CPU operation up to 120 MHz (from 1–25 MHz crystal or 12 MHz IRC), and a second PLL for USB timing independence. The RTC power domain includes 20 bytes of battery-backed registers and an event recorder functional down to 2.1 V supply.

Key Specifications

Pinout & Package

LPC1786FBD208 uses a plastic LQFP208 package (28 × 28 × 1.4 mm, SOT459-1), with 208 leads and 165 configurable GPIO pins distributed across Ports 0–4. All I/O pins are 5 V tolerant except ADC, crystal, power, and reference pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with LPC1788FBD208, LPC1786FBD208 trades flash capacity and Ethernet for lower cost and footprint-equivalent compatibility; versus LPC1776FBD208, it adds Ethernet while retaining identical memory and package - making it optimal for networked edge devices requiring minimal redesign.

Availability

LPC1786FBD208 is available at Aetrix Electronics and suitable for industrial automation, motor drive, and networked HMI applications requiring stable component supply, long-term lifecycle assurance, and consistent pin-compatible sourcing.

Supply support for LPC1786FBD208 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in ARM-based microcontrollers and edge processing.

The LPC178x/7x product line was engineered for high-performance, low-power embedded control in industrial gateways, motor drives, and human-machine interfaces - emphasizing real-time determinism, rich peripheral integration, and legacy pin compatibility.

FAQ

What is the maximum operating frequency of the LPC1786FBD208?

The LPC1786FBD208 operates at a maximum CPU frequency of 120 MHz, achieved using an on-chip PLL driven by either the 1–25 MHz external crystal oscillator or the internal 12 MHz RC oscillator. This frequency enables deterministic execution of real-time control loops and protocol stacks while maintaining low power consumption in active mode.

Does the LPC1786FBD208 include an Ethernet MAC?

Yes, the LPC1786FBD208 includes a fully integrated Ethernet MAC with MII and RMII interface support, along with an associated DMA controller. Unlike some variants in the LPC178x/7x family, LPC1786FBD208 retains Ethernet functionality - confirmed in Table 2 of the datasheet - making it suitable for industrial Ethernet node designs without requiring external PHYs beyond standard magnetics.

How much SRAM does the LPC1786FBD208 have, and how is it organized?

The LPC1786FBD208 provides 80 kB of total SRAM: 64 kB of main SRAM on the CPU's local code/data bus for high-speed instruction and data access, plus a single 16 kB peripheral SRAM block accessible via dedicated AHB path. This split architecture enables concurrent CPU execution and DMA transfers - for example, allowing GPDMA to stream ADC data into peripheral SRAM while the CPU processes prior samples in main SRAM.

Is the LPC1786FBD208 pin-compatible with earlier NXP microcontrollers?

Yes, the LPC1786FBD208 is designed for pin function compatibility with the LPC23xx and LPC24xx families in the LQFP208 package. This allows migration paths for legacy designs, preserving PCB layout where peripheral usage aligns - though engineers must verify signal routing for new features like Ethernet MII or LCD interface, which occupy previously unused pins in older parts.

What analog peripherals are integrated into the LPC1786FBD208?

The LPC1786FBD208 integrates an 8-channel 12-bit Analog-to-Digital Converter (ADC) with up to 400 kHz conversion rate and multiple result registers, plus a 10-bit Digital-to-Analog Converter (DAC) with dedicated conversion timer and GPDMA support. These peripherals operate independently of the CPU core, enabling simultaneous analog acquisition and waveform generation in motor control or sensor conditioning applications.