PIC24FJ512GU405-I/M4 - 16-Bit 512KB Flash MCU w/ USB & LCD | Microchip
MPN: PIC24FJ512GU405-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.18 | $5.18 |
| 10 | $4.66 | $46.60 |
| 100 | $4.15 | $415.00 |
| 500 | $3.73 | $1,865.00 |
| 1,000 | $3.33 | $3,330.00 |
PIC24FJ512GU405-I/M4 Overview
A PIC microcontroller (MCU) is a compact, programmable processor that integrates CPU, memory, and peripherals on a single CMOS die. PIC24F devices use a 16-bit modified Harvard architecture with a wide instruction set, positioning them between 8-bit PIC16/PIC18 parts and 32-bit PIC32 MCUs. The 'FJ' family is the eXtreme Low-Power (XLP) line, designed for battery-powered applications where nanoWatt sleep currents and active-mode efficiency extend runtime. Compared with general-purpose MCUs, PIC24F parts offer deterministic interrupt response, peripheral collaboration through CIPs (e.g. Configurable Logic Cells, DMA, CRC), and a mature MPLAB XC16 toolchain ecosystem.
Key features include 512KB dual-partition Flash with live OTA firmware swap, 32KB SRAM, full-speed USB 2.0 device/host/OTG, an integrated segmented LCD driver (up to 384 segments), up to 53 general-purpose I/O, multiple UART/SPI/I2C peripherals, 12-bit ADC (12 channels, with selectable 10-bit mode), 5-bit DAC, multiple timers, and 2 comparators. The dual-partition Flash architecture enables fail-safe OTA updates by running new firmware from the inactive partition while the live partition continues execution, then atomically swapping roles on reboot. Hardware crypto and a true random number generator are absent on this device.
Typical applications include battery-powered IoT sensor hubs, USB-enabled portable medical devices, segment-LCD thermostats and metering, wearables with OTA firmware, secure access control panels, and industrial HMI terminals. The integrated LCD and USB combined with 512KB Flash make it especially suitable for connected, display-driven products where BOM integration is critical. Designers migrating from smaller PIC24F parts gain headroom for richer application code and over-the-air feature deployment without external memory.
When designing with this MCU, ensure all VSS/VDD pins are connected even if one rail appears unused, because partial rail connection can fail ICSP programming. Decouple each VDD with a 100 nF X7R capacitor placed within 2 mm of the pin, and reserve a 10 uF bulk cap at the regulator output. Choose the -I/M4 suffix for industrial temperature UQFN, -I/PT for industrial TQFP, and the -E variants for extended temperature.
Drop-in alternatives for PIC24FJ512GU405-I/M4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC24FJ512GU405-I/M4 (same form factor and footprint) — differing in Package, Core Architecture, ADC, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ512GU406-I/M4
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ512GL405-I/M4
✅ Drop-In✓ In Stock
$2.71 / Unit
View Datasheet →PIC24FJ512GU405-I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC24FJ256GU405-I/PT
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →PIC24FJ256GU406T-I/MR
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC24FJ128GU405-I/PT
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →PIC24FJ512GU405-I/M4 Maximum Ratings & Electrical Characteristics
| Family | PIC24FJ 'GU4/GL4' |
| Core | 16-bit PIC24F CPU (modified Harvard) |
| Program Memory | 512 KB Flash (dual partition, OTA-capable) |
| SRAM | 32 KB |
| EEPROM Emulation | Supported via dual-partition Flash |
| Maximum CPU Speed | 32 MHz (with 48 MHz performance mode) |
| Operating Voltage (VDD) | 2.0 V to 3.6 V |
| Operating Temperature Range | -40 C to +85 C (Industrial, 'I' grade) |
| USB | Full-Speed USB 2.0 Device/Host/OTG |
| LCD Controller | Integrated, up to 384 segments |
| ADC | 12-bit, 12 channels (10-bit mode optional) |
| DAC | 5-bit |
| Comparators | 2 |
| Timers | Multiple 16-bit and 32-bit timers |
| Communication Peripherals | UART, SPI, I2C |
| GPIO | Up to 53 |
| Package | 48-UQFN (M4), 6x6 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC24FJ512GU405-I/M4 48-uqfn (m4), 6x6 mm Pin Configuration Guide
Pin configuration for PIC24FJ512GU405-I/M4 (48-uqfn (m4), 6x6 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC24FJ512GU405-I/M4.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC24FJ512GU405-I/M4 is suitable for 6 applications: Battery-Powered IoT Sensor Hub, USB-Enabled Portable Medical Device, Segment-LCD Thermostat or Meter, Industrial HMI Terminal, Wearable with OTA Firmware Update, Secure Access Control Panel.
Battery-Powered IoT Sensor Hub
The PIC24FJ512GU405-I/M4 is well matched to battery-powered IoT sensor hubs where the 512 KB dual-partition Flash supports real-time OTA firmware updates without service interruption. The XLP eXtreme Low-Power architecture delivers nanoWatt sleep currents, allowing the device to spend >99% of its time in deep sleep while periodically waking to read sensors over I2C or SPI. The integrated 12-bit ADC with 12 channels handles multiple analog sensor inputs directly, and the 32 KB SRAM buffers packet data before radio transmission. Engineers gain code headroom for protocol stacks (MQTT-SN, LoRaWAN) and security layers in a single chip.
Recommended
USB-Enabled Portable Medical Device
For USB-enabled portable medical devices, the PIC24FJ512GU405-I/M4's integrated full-speed USB 2.0 device controller eliminates the need for an external bridge chip, reducing BOM and PCB area. The 32 MHz CPU with 48 MHz performance mode handles signal processing for vital-sign monitoring, while the 512 KB Flash stores application code plus data logging buffers. The 12-bit ADC digitizes sensor inputs with sufficient resolution for pulse oximetry and ECG front-ends. The industrial temperature range (-40 C to +85 C) supports both clinical and home-care environments, and the XLP sleep modes extend battery life during standby.
Recommended
Segment-LCD Thermostat or Meter
The PIC24FJ512GU405-I/M4's integrated segmented LCD controller (up to 384 segments) drives numeric and icon displays without external driver ICs, cutting BOM cost in thermostats, electricity meters, and water meters. The 512 KB dual-partition Flash supports OTA calibration updates and feature rollouts in field-deployed utility assets. The 12-bit ADC reads temperature, flow, or current sensors with high accuracy, and the RTC plus multiple timers handle timekeeping and tariff scheduling. XLP nanoWatt sleep modes enable multi-year battery life on a single set of AA cells in metering applications.
Recommended
Industrial HMI Terminal
In industrial HMI terminals, the PIC24FJ512GU405-I/M4 drives a character or graphic LCD via its integrated segment controller while the 16-bit PIC24F CPU runs menu logic, Modbus RTU/TCP stacks, and CIP peripheral coordination. The 53 GPIOs handle keypad scanning, indicator LEDs, relay outputs, and isolated communication interfaces. The USB port enables configuration cloning via USB stick - critical for factory commissioning. The 512 KB Flash allows complex multilingual UI code, and CIPs (CLC, DMA, CRC) offload protocol handling from the CPU for deterministic response.
Recommended
Wearable with OTA Firmware Update
Wearable devices benefit from the PIC24FJ512GU405-I/M4's dual-partition Flash that enables live OTA firmware updates without service downtime - critical for fitness bands and smart watches where users cannot tolerate bricking. The XLP nanoWatt technology keeps sleep currents in the sub-microamp range, extending battery life through the day. The USB port allows tethered charging-data stations to share a single connector, and the LCD controller can drive small segment displays or status indicators. The industrial temperature range supports outdoor and fitness use cases.
Recommended
Secure Access Control Panel
In secure access control panels, the PIC24FJ512GU405-I/M4 serves as the main controller running card readers, keypads, and relay outputs. The 512 KB Flash accommodates secure credential stores plus audit logging code, and the dual-partition layout supports secure OTA firmware updates with cryptographic verification. The integrated USB enables badge cloning or configuration via USB stick during commissioning, and the 12-bit ADC monitors tamper switches and battery voltage. Industrial temperature rating supports outdoor installations in harsh environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ512GU405-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ512GU406-I/M4 | PIC24FJ512GL405-I/M4 | PIC24FJ512GU405-I/PT | PIC24FJ256GU405-I/PT | PIC24FJ128GU405-I/PT |
|---|---|---|---|---|---|---|
| Package | 48-UQFN (M4) 6x6 mm | 48-UQFN (M4) 6x6 mm - same | 48-UQFN (M4) 6x6 mm - same | 48-TQFP (PT) 7x7 mm - different | 48-TQFP (PT) - different | 48-TQFP (PT) - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 512 KB dual partition | 512 KB dual partition | 512 KB dual partition | 512 KB dual partition | 256 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| USB | Full-Speed USB 2.0 | Full-Speed USB 2.0 | None (LCD variant) | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 |
| LCD Controller | Up to 384 segments | Up to 384 segments | Higher segment count (GL variant) | Up to 384 segments | Up to 384 segments | Up to 384 segments |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
Key Differentiators
- Dual-partition Flash with real-time OTA updates (vs PIC24FJ256GU405-I/PT)
- Integrated full-speed USB 2.0 controller (vs PIC24FJ512GL405-I/M4)
- Compact 48-UQFN 6x6 mm package option (vs PIC24FJ512GU405-I/PT)
Design Notes
Decouple each VDD/VSS pin pair with a 100 nF X7R ceramic capacitor placed within 2 mm of the package pin to suppress switching transients from the on-chip core regulator. Add a single 10 uF bulk capacitor at the board's voltage regulator output. For battery-powered designs, route all VSS pins to a single ground star point to avoid ground bounce during deep-sleep wake transitions.
For the 48-UQFN (M4) package, expose the central thermal pad and stitch it to the ground plane with an 3x3 via array (0.3 mm hole, 0.5 mm pitch) to provide thermal relief and a low-impedance ground return. Keep the USB D+/D- traces length-matched within 2 mm and route them over a continuous ground plane to meet USB 2.0 signal-integrity requirements.
All VSS and VDD pins must be connected even if one appears unused - per Microchip's ICSP programming notes, partial rail connection can cause programming failure. The PIC24FJ GU4/GL4 family uses multiple PGECx/PGEDx pin pairs; you must use a pair together (e.g. PGEC2 with PGED2) for ICSP. Mismatched pairs will fail to program. Configure unused I/O as digital outputs driven low rather than floating inputs to minimize sleep current leakage.
Route the segmented LCD signals on a separate layer isolated from high-frequency digital signals to prevent coupling noise into the LCD drive waveforms, which can ghost-display artifacts. Place the LCD bias capacitors (typically 0.1 uF X7R) directly at the LCD bias pins with short traces. For USB designs, add a common-mode choke or ferrite on D+/D- lines if EMI compliance is required.
Compliance Information
RoHS and lead-free compliant per Microchip product page. Not AEC-Q100 qualified - automotive designs should use the PIC24FJxxx-Q1 series. Halogen-free status not explicitly stated in provided data.
