NXP Semiconductors LPC1342FHN33,551

Overview

LPC1342FHN33,551 from NXP Semiconductors is a 32-bit ARM Cortex-M3 microcontroller in a 33-pin HVQFN package, operating at up to 72 MHz with 16 kB flash, 4 kB SRAM, USB Device controller (full-speed), and 8-channel 10-bit ADC-designed for compact embedded control in lighting and metering systems.

For engineers reviewing the LPC1342FHN33,551 datasheet, LPC1342FHN33,551 pinout, LPC1342FHN33,551 application, or LPC1342FHN33,551 equivalent, key selection criteria include USB device capability in HVQFN33, Fast-mode Plus I²C support, UART with RS-485, and Deep-sleep wake-up via up to 40 GPIO pins.

Technical Context

The LPC1342FHN33,551 implements a Harvard-architecture ARM Cortex-M3 core with 3-stage pipeline, integrated NVIC, and prefetch unit supporting speculative branching. It uses separate instruction and data buses plus a dedicated peripheral bus for deterministic real-time response.

Its clock system includes dual PLLs-one for CPU operation up to 72 MHz from internal RC or crystal, and a second dedicated PLL for USB timing. Power management integrates Sleep, Deep-sleep, and Deep power-down modes with programmable brownout detection and wake-up logic on functional GPIO.

Key Specifications

Pinout & Package

HVQFN33 package: plastic thermal enhanced very thin quad flat package, no leads, 33 terminals, body 7 × 7 × 0.85 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC1342FHN33,551, the LPC1343FHN33 offers double flash and RAM for complex firmware, while the LPC1342FBD48 provides expanded I/O and dual SSP-making both viable alternatives depending on memory or pin count constraints.

Availability

LPC1342FHN33,551 is available at Aetrix Electronics and suitable for smart lighting control, energy metering, and home alarm systems requiring stable component supply and long-term industrial availability.

Supply support for LPC1342FHN33,551 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The LPC1300 series was designed for cost-sensitive, low-power embedded control-emphasizing USB integration, efficient power states, and compact packaging for space-constrained consumer and industrial devices.

FAQ

What is the maximum operating frequency of the LPC1342FHN33,551?

The LPC1342FHN33,551 operates at a maximum CPU frequency of 72 MHz, achieved using its system PLL driven by either the internal 12 MHz RC oscillator (trimmed to ±1 % accuracy) or an external crystal up to 25 MHz. This frequency enables real-time control loop execution and USB full-speed packet handling without external clock sources.

Does the LPC1342FHN33,551 support USB device functionality without external components?

Yes, the LPC1342FHN33,551 integrates a full-speed USB 2.0 Device controller with on-chip PHY, including USB_DP and USB_DM pins, SoftConnect logic (via PIO0_6), and VBUS monitoring (PIO0_3). No external transceiver, pull-up resistors, or level shifters are required-enabling fully self-contained USB HID or MSC implementations in the HVQFN33 package.

How many analog inputs does the LPC1342FHN33,551 support?

The LPC1342FHN33,551 features an 8-channel 10-bit successive approximation register (SAR) ADC. Inputs AD0 through AD7 map to dedicated pins PIO0_11, PIO1_0–PIO1_3, PIO1_4–PIO1_11 (excluding reserved functions), enabling simultaneous sampling of voltage, temperature, or current sensors in metering and appliance applications.

What power-saving modes are available on the LPC1342FHN33,551?

The LPC1342FHN33,551 supports three reduced-power modes: Sleep (CPU halted, peripherals active), Deep-sleep (CPU and most clocks off, RAM retained), and Deep power-down (all clocks off, RAM lost, wake-up via dedicated pins). Brownout detect with four thresholds and programmable watchdog oscillator further optimize energy use in battery-powered or energy-harvesting designs.

Is the LPC1342FHN33,551 pin-compatible with other members of the LPC13xx family?

The LPC1342FHN33,551 shares the HVQFN33 package and pinout with LPC1311FHN33, LPC1313FHN33, and LPC1343FHN33-but differs in flash/SRAM size, USB inclusion, and peripheral enablement. While pin assignments are identical, firmware must be validated for memory layout and peripheral initialization differences before substitution.