PIC24FJ128GU408-I/PT - 16-bit MCU, 128KB Flash, USB, LCD, 80-TQFP | Microchip
MPN: PIC24FJ128GU408-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.42 | $44.20 |
| 100 | $3.94 | $394.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.17 | $3,170.00 |
| 3,000 | $2.84 | $8,520.00 |
PIC24FJ128GU408-I/PT Overview
A 16-bit microcontroller is a class of embedded processor that uses a 16-bit data path, registers, and ALU, sitting in the hierarchy between 8-bit MCUs (e.g. PIC16) and 32-bit Cortex-M parts. PIC24F devices use a modified Harvard architecture with a 16-bit instruction word, peripheral pin select (PPS) for flexible I/O mapping, and on-chip DSP-like features (bit-reversed addressing, MAC) used for signal processing and motor/USB stacks. The 'FJ' family adds eXtreme Low Power (XLP) technology, achieving sub-uA sleep currents suitable for battery and energy-harvesting designs.
Key features of the PIC24FJ128GU408 include Dual Partition Flash with EEPROM emulation, which lets the device perform Over-The-Air (OTA) firmware upgrades without external storage; up to 69 I/O pins with PPS remapping; a 5-bit DAC and 12-bit ADC; up to four UART, three SPI, and three I2C peripherals; and a real-time clock-calendar with backup battery domain. A dedicated USB 2.0 full-speed transceiver supports device, host, and OTG roles. The on-chip segmented LCD controller can drive up to 480 segments with configurable charge-pump bias.
Architecturally, the device is optimized for low-power mixed-signal designs: Sleep current down to 180 nA with RTCC running, IDD of approximately 4.8 mA at 32 MHz full activity, and DMA-driven peripherals that offload the CPU. The Dual Partition Flash combined with the Device Firmware Upgrade (DFU) bootloader over USB enables field firmware refresh on consumer and industrial products, while the segmented LCD driver and USB make it especially attractive for HMI/medical/IoT endpoints.
Typical applications include USB-connected industrial HMIs with LCD displays, battery-powered portable medical devices (glucose meters, spirometers), smart energy metering with segmented LCD readout, USB peripherals (barcode scanners, EPOS terminals), and IoT sensor hubs with on-screen configuration. Its wide industrial temperature range also supports outdoor signage and factory-automation panels.
When designing with this MCU, choose the appropriate package variant (PT = TQFP-80; alternate pin-compatible PT/ML/MR options exist in the family for board-flexibility). Provide a 32.768 kHz crystal on the secondary oscillator for RTCC accuracy, and add the recommended USB series resistor (33 O-15 VBUS) and ESD protection. Decouple VDD with 100 nF plus bulk capacitance per the family reference schematic.
This page synthesizes distributor pricing, drop-in same-family alternatives, parametric comparisons, and application guidance that are not aggregated on any single manufacturer or distributor page.
Drop-in alternatives for PIC24FJ128GU408-I/PT — 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 PIC24FJ128GU408-I/PT (same form factor and footprint) — differing in ADC, Package, Core Architecture, USB, I/O Pins.
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View Datasheet →PIC24FJ128GB410-I/PT
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View Datasheet →PIC24FJ128GU408-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F (16-bit modified Harvard) |
| Family | PIC24FJ 'GU4/GL4' |
| Program Memory (Flash) | 128 KB (Dual Partition, ECC) |
| Data SRAM | 32 KB |
| Max CPU Speed | 32 MHz (16 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | Up to 69 |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| LCD Controller | Segmented LCD driver (up to 480 segments) |
| ADC | 12-bit, up to 24 channels |
| DAC | 5-bit |
| Timers | Multiple 16-bit, RTCC with backup domain |
| Communication | Up to 4x UART, 3x SPI, 3x I2C |
| DMA | Yes (peripheral-to-memory) |
| Package | 80-pin TQFP (12x12 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24FJ128GU408-I/PT 80-pin tqfp (12x12 mm) Pin Configuration Guide
Pin configuration for PIC24FJ128GU408-I/PT (80-pin tqfp (12x12 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 PIC24FJ128GU408-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC24FJ128GU408-I/PT is suitable for 6 applications: USB-Connected Industrial HMI with LCD, Battery-Powered Portable Medical Devices, USB Barcode Scanners and EPOS Terminals, Smart Energy Meters with LCD Readout, IoT Sensor Hubs with On-Screen Configuration, Outdoor Industrial Signage and Control Panels.
USB-Connected Industrial HMI with LCD
The PIC24FJ128GU408-I/PT fits USB industrial HMIs because of its integrated USB 2.0 full-speed transceiver and on-chip segmented LCD controller capable of driving up to 480 segments. The Dual Partition 128 KB ECC Flash supports Over-The-Air firmware upgrades via USB DFU without external storage, ideal for factory panels where field updates minimize downtime. Its XLP architecture drops to ~180 nA sleep current, preserving battery backup on panel-mounted designs. Place between the 3.3V LDO and the LCD glass + USB connector; unlike parts without integrated USB, it eliminates the need for an external transceiver, simplifying BOM and freeing PCB space.
Recommended
Battery-Powered Portable Medical Devices
For portable medical devices such as glucose meters, spirometers, and pulse oximeters, the PIC24FJ128GU408-I/PT offers the right combination of low-power XLP operation, segmented LCD for parameter display, and ample 32 KB SRAM for signal buffering. The 12-bit ADC handles sensor front-end sampling while USB enables clinic-side data transfer for result export. Sleep current around 180 nA with RTCC active allows coin-cell or rechargeable Li-Ion operation over multi-year battery life. Integrate with the on-chip RTCC for time-stamping measurements and use DMA to offload ADC sampling, preserving MIPS for display refresh and user-interface logic.
Recommended
USB Barcode Scanners and EPOS Terminals
EPOS terminals and barcode scanners benefit from the PIC24FJ128GU408-I/PT's integrated USB 2.0 full-speed transceiver in device mode, eliminating external PHY costs. The 32 MHz core at 16 MIPS handles USB HID stacks, image sensor interfacing via SPI, and segmented LCD for readout without external driver chips. The 80-pin TQFP provides 69 I/O pins for scanner trigger, buzzer, beeper, and keyboard matrix. Use PPS to remap peripherals dynamically and configure device or host roles depending on EPOS cradle topology. USB DFU bootloading lets the manufacturer update scan algorithms post-install.
Recommended
Smart Energy Meters with LCD Readout
Single-phase smart energy meters with segmented LCD readout are a strong fit for the PIC24FJ128GU408-I/PT. The on-chip segmented LCD driver handles kWh and tariff display, while the 12-bit ADC samples current/voltage sensors for energy calculation. Dual Partition Flash lets the utility perform OTA tariff and firmware updates over USB or serial. XLP low-power operation supports battery backup for outage timekeeping via the integrated RTCC. Unlike parts without LCD controller, the MCU drives glass directly with charge-pump bias, removing the cost of an external LCD driver IC.
Recommended
IoT Sensor Hubs with On-Screen Configuration
IoT sensor hubs that display configuration via segmented LCD benefit from the PIC24FJ128GU408-I/PT's combination of USB connectivity, Dual Partition OTA firmware updates, and 32 KB SRAM for local buffering. The 69 I/O pins accommodate SPI sensors, I2C peripherals, and UART modules. Use the integrated RTCC for time-stamped sensor logs and DMA for autonomous data acquisition without CPU overhead. Unlike MCUs without USB, this device allows direct laptop connectivity for configuration without additional bridge chips. The XLP architecture keeps idle current under 1 uA for solar/battery deployments.
Recommended
Outdoor Industrial Signage and Control Panels
Outdoor industrial signage and control panels need wide industrial temperature range (-40 C to +85 C), integrated LCD driving, and field-updatable firmware - all delivered by the PIC24FJ128GU408-I/PT. The Dual Partition Flash supports USB-based firmware refresh from a technician laptop without production-line interruption. With 128 KB Flash and 32 KB SRAM, the MCU drives 480-segment LCDs for multi-line status, and the XLP architecture minimizes standby current for solar-powered installations. Use PPS to remap peripheral pins for layout flexibility in compact panel designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ128GU408-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GU406-I/PT | PIC24FJ128GL406-I/PT | PIC24FJ128GL405-I/PT | PIC24FJ128GB410-I/PT | PIC24FJ128GA610-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-80 (12x12 mm) | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| USB Controller | Full-Speed Device/Host/OTG | Full-Speed Device/Host/OTG | None | None | Full-Speed | None |
| Segmented LCD Driver | Yes (up to 480 segments) | Yes | Yes | Yes | No | No |
| Max CPU Speed | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | Higher MIPS | Higher MIPS |
| Dual Partition Flash (OTA) | Yes | Yes | Yes | Yes | No | No |
| XLP Low Power | Yes (~180 nA sleep) | Yes | Yes | Yes | Limited | Limited |
Key Differentiators
- Dual Partition Flash with USB DFU bootloading (vs PIC24FJ128GB410-I/PT)
- Integrated segmented LCD driver (vs PIC24FJ128GA610-I/PT)
- USB 2.0 Full-Speed with device/host/OTG roles (vs PIC24FJ128GL406-I/PT)
Design Notes
Operate VDD between 2.0V and 3.6V; use a low-dropout regulator such as MCP1702 for 3.3V rail from Li-Ion cells. Decouple every VDD pin with a 100 nF ceramic cap placed within 5 mm of the pin, and add a bulk 4.7 uF to 10 uF capacitor near the package. Connect unused VDD pins to the same rail to ensure deterministic behavior, and tie all VSS pins to a low-impedance ground pour.
Route the USB DP/DM differential pair with 90 O-15 differential impedance and length-matched traces. Place a 33 O-15 series resistor on each USB line near the connector, with ESD protection diodes within 3 mm of the connector shell. Keep the crystal traces short and guarded by a ground pour; route the 32.768 kHz secondary oscillator traces symmetrically to minimize noise coupling into the RTCC domain.
Estimated: When using the segmented LCD driver with internal charge pump, ensure VLCD voltage does not exceed VDD + 0.3V. Verify charge-pump capacitor values per the family datasheet; undersized capacitors cause display flicker at low temperature. Do not exceed 32 MHz system clock without configuring PLL correctly. Remember to enable the JTAG fuse correctly to avoid unintentional debug port activation in production parts.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40 C to +85 C). Not AEC-Q100 qualified - this is a general-purpose MCU, not automotive-grade.