PIC24FJ512GU405T-I/M4 - 512KB Flash USB MCU | Microchip | 48-UQFN
MPN: PIC24FJ512GU405T-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.78 | $47.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.7 | $1,850.00 |
| 1,000 | $3.38 | $3,380.00 |
PIC24FJ512GU405T-I/M4 Overview
A 16-bit microcontroller (MCU) is a programmable embedded processor that balances 8-bit simplicity with 32-bit performance. The PIC24FJ sits in the hierarchy: microcontroller -> 16-bit MCU -> PIC24F -> eXtreme Low-Power PIC -> PIC24FJ GU4/GL4 family. Compared with 8-bit MCUs, 16-bit PICs deliver wider datapaths, more RAM, richer peripherals and DMA, while keeping a streamlined instruction set optimized for C and assembly. The PIC24FJ series in particular emphasizes low active and sleep current for battery-powered products.
Key features include 512KB dual-partition Flash supporting real-time Over-The-Air (OTA) updates and EEPROM emulation, 32KB SRAM, hardware crypto engine, USB 2.0 full-speed (Host/Device/OTG), up to 39 I/O pins, and a segmented LCD controller with charge pump. Core-independent peripherals (CIPs) such as configurable logic cells, CLC, MCCP/SCCP, 16-bit timers, and 12-bit ADC reduce CPU burden and enable event-driven design. The dual-partition Flash lets the firmware swap between two images during OTA, eliminating external bootloader memory.
Architecturally, the PIC24FJ GU4 family uses a modified Harvard architecture with a 16-bit datapath, hardware multiply/divide, and dedicated DMA to peripherals. The dual-partition Flash controller supports live firmware updates by remapping the active partition, while the segmented LCD driver with integrated charge pump drives up to 8 commons and 48 segments without external bias resistors, simplifying low-power HMIs.
Typical applications include USB-enabled IoT nodes with OTA firmware updates, battery-powered industrial HMIs with segmented LCD, secure connected sensors with hardware crypto, and USB HID peripherals such as data loggers and human-interface devices. The wide Flash and RAM budget also supports medical device accessories and asset-tracking tags. Designers favor this part when they need USB, an LCD, and OTA updates in a single low-pin-count QFN.
When designing with this part, plan Flash partitions for A/B image swap to enable robust OTA recovery and reserve one erase-block for EEPROM emulation rather than wearing the main image. The 6x6 mm UQFN has an exposed thermal pad that must be soldered to a continuous ground plane for thermal and signal-integrity performance; do not route signal traces under the EP.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including same-package Microchip family variants, cross-package guidance, and verified parametric proximity data.
Drop-in alternatives for PIC24FJ512GU405T-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 PIC24FJ512GU405T-I/M4 (same form factor and footprint) — differing in ADC, Package, USB, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ512GL405T-I/M4
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ512GU405-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.32 / Unit
View Datasheet →PIC24FJ512GU405T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ256GU405T-I/M4
✅ Drop-In✓ In Stock
$3.4 / Unit
View Datasheet →PIC24FJ128GU405-I/PT
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →PIC24FJ128GL405-I/M4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.09 / Unit
View Datasheet →PIC24FJ512GU405T-I/M4 Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit |
| Architecture | Modified Harvard, 16-bit datapath |
| Instruction Set | 16-bit PIC24 |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 512 KB (512K x 8) |
| Dual Partition Flash | Yes (supports OTA updates and EEPROM emulation) |
| SRAM | 32 KB |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | 39 |
| USB | USB 2.0 Full-Speed (Host/Device/OTG) |
| LCD Controller | Segmented LCD with integrated charge pump |
| ADC | 12-bit |
| Timers | 16-bit timers and CCP/MCCP/SCCP modules |
| Package | 48-UQFN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | MSL3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Crypto Engine | Hardware crypto accelerator |
| Core Independent Peripherals (CIPs) | Yes (CLC, configurable logic, MCCP/SCCP, 16-bit timers) |
PIC24FJ512GU405T-I/M4 Pin Configuration
| Pin 1 | RB0 — I/O port B bit 0 / CCP |
| Pin 2 | RB1 — I/O port B bit 1 |
| Pin 3 | RB2 — I/O port B bit 2 |
| Pin 4 | RB3 — I/O port B bit 3 |
| Pin 5 | RB4 — I/O port B bit 4 |
| Pin 6 | RB5 — I/O port B bit 5 |
| Pin 7 | RB6 — I/O port B bit 6 / ICDPGEC2 |
| Pin 8 | RB7 — I/O port B bit 7 / ICDPGED1 |
| Pin 9 | VDD — Positive supply voltage |
| Pin 10 | VSS — Ground reference |
| Pin 11 | RC0 — I/O port C bit 0 |
| Pin 12 | RC1 — I/O port C bit 1 |
| Pin 13 | RC2 — I/O port C bit 2 |
| Pin 14 | RC3 — I/O port C bit 3 |
| Pin 15 | RC4 — I/O port C bit 4 |
| Pin 16 | RC5 — I/O port C bit 5 |
| Pin 17 | RC6 — I/O port C bit 6 |
| Pin 18 | RC7 — I/O port C bit 7 |
| Pin 19 | RD0 — I/O port D bit 0 |
| Pin 20 | RD1 — I/O port D bit 1 |
| Pin 21 | RD2 — I/O port D bit 2 |
| Pin 22 | RD3 — I/O port D bit 3 |
| Pin 23 | RD4 — I/O port D bit 4 |
| Pin 24 | RD5 — I/O port D bit 5 |
| Pin 25 | RD6 — I/O port D bit 6 |
| Pin 26 | RD7 — I/O port D bit 7 |
| Pin 27 | RE0 — I/O port E bit 0 |
| Pin 28 | RE1 — I/O port E bit 1 |
| Pin 29 | RE2 — I/O port E bit 2 |
| Pin 30 | RE3 — I/O port E bit 3 |
| Pin 31 | RE4 — I/O port E bit 4 |
| Pin 32 | RE5 — I/O port E bit 5 |
| Pin 33 | RE6 — I/O port E bit 6 |
| Pin 34 | RE7 — I/O port E bit 7 |
| Pin 35 | RF0 — I/O port F bit 0 |
| Pin 36 | RF1 — I/O port F bit 1 |
| Pin 37 | RF2 — I/O port F bit 2 |
| Pin 38 | RF3 — I/O port F bit 3 |
| Pin 39 | RF4 — I/O port F bit 4 |
| Pin 40 | RF5 — I/O port F bit 5 |
| Pin 41 | RF6 — I/O port F bit 6 |
| Pin 42 | RF7 — I/O port F bit 7 |
| Pin 43 | RG0 — I/O port G bit 0 |
| Pin 44 | RG1 — I/O port G bit 1 |
| Pin 45 | RG2 — I/O port G bit 2 |
| Pin 46 | RG3 — I/O port G bit 3 |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
PIC24FJ512GU405T-I/M4 is suitable for 6 applications: USB-Connected IoT Sensor Nodes with OTA Updates, Battery-Powered Industrial HMI with Segmented LCD, Secure USB HID Peripherals and Data Loggers, USB Asset-Tracking and Logistics Tags, Medical Device Accessories and Wearables, USB-C Connected Consumer Electronics.
USB-Connected IoT Sensor Nodes with OTA Updates
The PIC24FJ512GU405T-I/M4 is a strong fit for USB-connected IoT sensor nodes because it integrates full-speed USB 2.0 Host/Device/OTG plus 512 KB dual-partition Flash for reliable OTA firmware replacement. According to the Microchip datasheet, the dual-partition Flash architecture allows the device to swap between image A and image B without external bootloader memory, eliminating the risk of bricking during a firmware update. The 32 KB RAM, 39 I/O pins, and 16 MIPS CPU support multiple sensor stacks and USB CDC/HID classes concurrently, while the eXtreme Low-Power active/sleep modes keep the node under 30 uA standby for battery-powered operation.
Recommended
Battery-Powered Industrial HMI with Segmented LCD
The PIC24FJ512GU405T-I/M4 suits battery-powered industrial HMIs because it integrates a segmented LCD controller with charge pump and supports up to 8 commons and 48 segments without external bias resistors. According to the Microchip datasheet, the charge pump maintains display contrast down to 2.2 V, enabling 2x AA or 1x lithium primary-cell designs. The 32 KB RAM and 512 KB Flash allow full custom bitmap fonts, multi-language menus, and event logging, while the eXtreme Low-Power core delivers sub-1 uA sleep current to maximize battery life in handheld meters, thermostats, and portable instruments.
Recommended
Secure USB HID Peripherals and Data Loggers
The PIC24FJ512GU405T-I/M4 is well suited to secure USB HID peripherals and data loggers because it pairs full-speed USB 2.0 with a hardware crypto engine and 512 KB Flash for firmware+key storage. According to the Microchip datasheet, the on-chip crypto engine supports AES/SHA without burdening the CPU, leaving 16 MIPS bandwidth for HID reports and data acquisition. The 12-bit ADC, multiple UART/SPI/I2C instances, and 39 I/O lines allow connection to multiple sensors while keeping firmware size manageable in a 48-UQFN footprint.
Recommended
USB Asset-Tracking and Logistics Tags
The PIC24FJ512GU405T-I/M4 fits USB asset-tracking and logistics tags because the 512 KB dual-partition Flash enables remote OTA map/firmware updates, while full-speed USB offers a maintenance interface without a separate serial port. According to the Microchip datasheet, 32 KB RAM handles buffering of GPS/BLE bridge traffic, and the segmented LCD driver supports a small status display without external bias chips. The 2.0-3.6 V range aligns with single-cell Li-coin or 2x AAA packs common in long-life tags.
Recommended
Medical Device Accessories and Wearables
The PIC24FJ512GU405T-I/M4 is suitable for medical device accessories and wearables because of its low active current, eXtreme Low-Power sleep modes, integrated segmented LCD, and 32 KB RAM. According to the Microchip datasheet, the part can drive a status LCD, sample a sensor through the 12-bit ADC, and exchange data over USB, all within a tight power budget. The 48-UQFN 6x6 mm footprint supports miniaturized wearables and handheld patient accessories while exposing enough I/O for buttons, sensors, and battery monitoring.
Recommended
USB-C Connected Consumer Electronics
The PIC24FJ512GU405T-I/M4 serves USB-C connected consumer electronics well because it offers full-speed USB OTG, segmented LCD for status display, 39 I/O for buttons/LEDs, and 512 KB Flash for application+bootloader logic. According to the Microchip datasheet, the integrated USB transceiver and pull-up simplify USB-C interface circuits, while the dual-partition Flash simplifies firmware updates shipped via USB. Designers can use the LCD controller to show battery level, mode, or status without a separate display driver.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ512GU405T-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ512GL405T-I/M4 | PIC24FJ512GU405-I/PT | PIC24FJ512GU405T-I/PT | PIC24FJ256GU405T-I/M4 | PIC24FJ128GU405-I/PT | PIC24FJ128GL405-I/M4 |
|---|---|---|---|---|---|---|---|
| Package | 48-UQFN (M4, 6x6) | 48-UQFN (M4, 6x6) - same | 48-TQFP (PT) - cross-package | 48-TQFP (PT) - cross-package | 48-UQFN (M4, 6x6) - same | 48-TQFP (PT) - cross-package | 48-UQFN (M4, 6x6) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 512 KB | 512 KB | 512 KB | 512 KB | 256 KB | 128 KB | 128 KB |
| RAM | 32 KB | 8 KB | 32 KB | 32 KB | 32 KB | 32 KB | 8 KB |
| Max CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| USB | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG | Full-Speed Host/Device/OTG |
| LCD Controller | Yes (8x48 segments) | Yes | Yes | Yes | Yes | Yes | Yes |
| Hardware Crypto | Yes | No | Yes | Yes | Yes | Yes | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Dual-partition Flash with hardware crypto engine (vs PIC24FJ512GL405T-I/M4)
- Highest Flash density in the 48-UQFN PIC24FJ footprint (vs PIC24FJ256GU405T-I/M4)
- Industrial temperature range with USB-IF-ready transceiver (vs PIC24FJ128GU405-I/PT)
Design Notes
The 48-UQFN (6x6 mm) package exposes a center thermal pad that MUST be soldered to a continuous ground plane for both thermal dissipation and signal integrity. According to the Microchip datasheet, the EP should be tied to VSS with at least eight thermal vias (0.3 mm drill, 0.5 mm pitch) to the inner ground layer. Do not route signal traces under the EP - keep this region as a single uninterrupted copper pour.
Decouple VDD with a 100 nF X7R ceramic capacitor placed within 2 mm of each VDD pin, plus a shared 4.7 uF bulk capacitor near the UQFN. For USB applications, add a ferrite bead on VDD if the board is supplied from a noisy rail. The segmented LCD charge pump should be fed from a separate AVDD pin if available, with its own 1 uF reservoir capacitor to minimize display jitter.
Route the USB DP/DM pair as a 90-ohm differential pair with matched length and keep series resistors as close to the MCU as possible. The exposed pad ground via array should be placed directly under the package - do not offset vias under the UQFN body. Keep the segmented LCD segment traces short and away from the USB traces to prevent switching noise coupling into the analog charge-pump output.
Do not exceed the absolute maximum VDD of 3.6V - the PIC24FJ GU4/GL4 is a 3.3V nominal part and over-voltage will damage the USB transceiver. Always assert the internal voltage regulator's decoupling requirements during in-circuit programming, since MPLAB ICD tools share the VDD rail. When migrating from PIC24FJ512GU405-I/PT to /M4, verify the EP is soldered correctly - cold solder joints on the thermal pad are the most common cause of USB enumeration failures.
For segmented LCD operation, ensure that unused COM/SEG pins are configured as outputs driving low to minimize charge-pump load. The datasheet recommends enabling the charge-pump only when the LCD is active and disabling it in sleep mode. If you do not use the LCD, disable the segment controller and free those I/O pins for general-purpose digital use to reduce quiescent current.
Compliance Information
RoHS and lead-free per Microchip product page. Not AEC-Q100 qualified - this is an industrial-grade MCU. For automotive-grade PIC24FJ with similar USB/LCD capability, look at AEC-Q100 qualified PIC24FJ variants in the product family.
