PIC24FJ128GU408T-I/PT - 128KB Flash 16-bit USB MCU 80-TQFP | Microchip
MPN: PIC24FJ128GU408T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.12 | $7.12 |
| 10 | $6.45 | $64.50 |
| 100 | $5.71 | $571.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.48 | $4,480.00 |
PIC24FJ128GU408T-I/PT Overview
A microcontroller (MCU) is a single-chip computer integrating a CPU core, program memory (Flash), working memory (RAM), and programmable I/O peripherals. Within the broader taxonomy, an MCU belongs to the embedded computing family and within Microchip's portfolio sits under the PIC24F sub-family of 16-bit microcontrollers, which occupies the middle ground between 8-bit PIC16/PIC18 devices and 32-bit PIC32 products. The PIC24F 'GU4/GL4' generation specifically targets low-power connected applications that need USB device/host/OTG and segment-LCD glass drive.
Key features include Core Independent Peripherals (CIPs) such as Configurable Logic Cells (CLC), Multiple Output Capture/Compare/PWM, a 12-bit ADC with 200 ksps throughput, and a hardware RTCC with calendar mode. Memory integrity is enhanced by Error Correction Code on Flash, and the segmented LCD driver supports up to 512 segments directly without external charge-pump components. A full-speed USB 2.0 FS PHY with on-chip transceiver simplifies connectivity to hosts and embedded devices.
Architecturally, the PIC24FJ uses a 16-bit modified-Harvard core with separate program and data paths, a hardware multiplier, and a zero-overhead hardware DO loop engine that accelerates DSP-style signal processing. Dual Partition Flash allows a bootloader and a main application to swap roles atomically, enabling fail-safe firmware updates via USB or other channels. The 5V-tolerant I/O pins (with 3.3V Vdd) ease mixed-voltage interfacing to legacy logic and peripherals.
Typical applications include USB human-interface devices (HID), industrial segment-LCD panels and meters, battery-powered sensor hubs, point-of-sale terminals, and medical instrumentation front panels. The wide operating voltage range and rich analog/digital peripherals also suit smart-home gateways and connected IoT edge nodes.
When designing with this part, allocate pins carefully: USB D+/D- require specific shared pins, the LCD segment allocation must be planned against available I/O, and a 12 MHz or 32.768 kHz crystal layout should follow the manufacturer hardware checklist for EMI and noise immunity.
This page synthesizes distributor pricing, drop-in alternative MPNs, and engineering design notes beyond what the manufacturer datasheet alone provides, helping procurement and firmware engineers evaluate the PIC24FJ128GU408T-I/PT for production designs.
Drop-in alternatives for PIC24FJ128GU408T-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 PIC24FJ128GU408T-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, USB, ADC, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GU408-I/PT
✅ Drop-In✓ In Stock
$2.84 / Unit
View Datasheet →PIC24FJ128GU406-I/PT
✅ Drop-In✓ In Stock
$3.36 / Unit
View Datasheet →PIC24FJ128GU405-I/PT
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →PIC24FJ128GL410T-I/PT
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC24FJ128GL406-I/PT
✅ Drop-In✓ In Stock
$2.84 / Unit
View Datasheet →PIC24FJ128GA610-I/PT
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC24FJ128GU408T-I/PT Maximum Ratings & Electrical Characteristics
| Family | PIC24F 'GU4/GL4' |
| Core | PIC24 16-bit modified Harvard |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 128 KB (128K x 8) with ECC |
| RAM | 32 KB |
| Operating Voltage | 2.0 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 80-TQFP (12x12 mm) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed Device/Host/OTG with on-chip transceiver |
| LCD Driver | Integrated segment LCD controller (up to 512 segments) |
| ADC | 12-bit, up to 200 ksps |
| Timers | Multiple 16-bit and 32-bit timer/counter modules |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24FJ128GU408T-I/PT Pin Configuration
| Pin 1 | SDA3/RG3 — I2C3 data / Port G bit 3 |
| Pin 2 | SCL3/RG2 — I2C3 clock / Port G bit 2 |
| Pin 3 | RG1 — Port G bit 1 |
| Pin 4 | RG0 — Port G bit 0 |
| Pin 5 | RF13 — Port F bit 13 |
| Pin 6 | RF12 — Port F bit 12 |
| Pin 7 | VDD — Positive supply (2.0 V to 3.6 V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RF5/USBID — Port F bit 5 / USB OTG ID |
| Pin 10 | RF4/USBVbus — Port F bit 4 / USB Vbus detect |
| Pin 11 | D-/RF3 — USB D- / Port F bit 3 |
| Pin 12 | D+/RF2 — USB D+ / Port F bit 2 |
| Pin 13 | VUSB3V3 — USB internal 3.3 V regulator output |
| Pin 14 | RG15 — Port G bit 15 |
| Pin 15 | RG14 — Port G bit 14 |
| Pin 16 | VDD — Positive supply |
| Pin 17 | VSS — Ground reference |
| Pin 18 | RA15 — Port A bit 15 |
| Pin 19 | RA14 — Port A bit 14 |
| Pin 20 | RA13 — Port A bit 13 |
| Pin 21 | RA12 — Port A bit 12 |
| Pin 22 | RA11 — Port A bit 11 |
| Pin 23 | RA10 — Port A bit 10 |
| Pin 24 | RA9 — Port A bit 9 |
| Pin 25 | VDD — Positive supply |
| Pin 26 | VSS — Ground reference |
| Pin 27 | RA7 — Port A bit 7 |
| Pin 28 | RA6 — Port A bit 6 |
| Pin 29 | RC15 — Port C bit 15 |
| Pin 30 | RC14 — Port C bit 14 |
| Pin 31 | RC13 — Port C bit 13 |
| Pin 32 | VSS — Ground reference |
| Pin 33 | RC12 — Port C bit 12 |
| Pin 34 | RC11 — Port C bit 11 |
| Pin 35 | RC10 — Port C bit 10 |
| Pin 36 | RC9 — Port C bit 9 |
| Pin 37 | RC8 — Port C bit 8 |
| Pin 38 | RC7 — Port C bit 7 |
| Pin 39 | RC6 — Port C bit 6 |
| Pin 40 | RD15 — Port D bit 15 |
| Pin 41 | RD14 — Port D bit 14 |
| Pin 42 | VDD — Positive supply |
| Pin 43 | VSS — Ground reference |
| Pin 44 | RD13 — Port D bit 13 |
| Pin 45 | RD12 — Port D bit 12 |
| Pin 46 | RD11 — Port D bit 11 |
| Pin 47 | RD10 — Port D bit 10 |
| Pin 48 | RD9 — Port D bit 9 |
| Pin 49 | RD8 — Port D bit 8 |
| Pin 50 | RC5 — Port C bit 5 |
| Pin 51 | RC4 — Port C bit 4 |
| Pin 52 | RC3 — Port C bit 3 |
| Pin 53 | RC2 — Port C bit 2 |
| Pin 54 | RC1 — Port C bit 1 |
| Pin 55 | RC0 — Port C bit 0 |
| Pin 56 | RE15 — Port E bit 15 |
| Pin 57 | RE14 — Port E bit 14 |
| Pin 58 | VDD — Positive supply |
| Pin 59 | VSS — Ground reference |
| Pin 60 | RE13 — Port E bit 13 |
| Pin 61 | RE12 — Port E bit 12 |
| Pin 62 | RE11 — Port E bit 11 |
| Pin 63 | RE10 — Port E bit 10 |
| Pin 64 | RE9 — Port E bit 9 |
| Pin 65 | RE8 — Port E bit 8 |
| Pin 66 | RE7 — Port E bit 7 |
| Pin 67 | RE6 — Port E bit 6 |
| Pin 68 | RE5 — Port E bit 5 |
| Pin 69 | RE4 — Port E bit 4 |
| Pin 70 | RE3 — Port E bit 3 |
| Pin 71 | RE2 — Port E bit 2 |
| Pin 72 | RE1 — Port E bit 1 |
| Pin 73 | RE0 — Port E bit 0 |
| Pin 74 | RB15 — Port B bit 15 |
| Pin 75 | RB14 — Port B bit 14 |
| Pin 76 | RB13 — Port B bit 13 |
| Pin 77 | RB12 — Port B bit 12 |
| Pin 78 | RB11 — Port B bit 11 |
| Pin 79 | RB10 — Port B bit 10 |
| Pin 80 | MCLR — Master Clear (reset) input |
Typical Applications
PIC24FJ128GU408T-I/PT is suitable for 6 applications: USB Human Interface Devices (HID), Segment-LCD Display Panels and Meters, Battery-Powered IoT Sensor Hubs, Industrial Point-of-Sale Terminals, Medical Instrumentation Front Panels, Connected Home and Smart-Home Gateways.
USB Human Interface Devices (HID)
The PIC24FJ128GU408T-I/PT is purpose-built for USB HID peripherals such as keyboards, mice, game controllers, custom input panels, and barcode scanners. Its integrated USB 2.0 Full-Speed PHY eliminates the external transceiver, reducing BOM cost and PCB area, while the 32 KB RAM comfortably buffers HID report descriptors plus vendor-specific payloads. The 128 KB ECC Flash accommodates large USB stack implementations and vendor firmware. The 80-TQFP package exposes enough I/O for matrix-scanned key arrays, while the 32 MHz core processes HID reports and debouncing with significant margin. Operating from 2.0-3.6 V simplifies direct Li-ion or USB-bus-powered designs without additional regulators.
Recommended
Segment-LCD Display Panels and Meters
The integrated segment-LCD controller drives up to 512 segments directly, suiting industrial meters, point-of-sale terminals, medical pumps, and consumer appliances with multi-digit displays. Unlike solutions requiring external charge-pump ICs, this MCU integrates bias generation and waveform timing on-chip, allowing direct connection to standard TN glass. Combined with the 32 KB RAM available for frame buffers and the 16 MIPS CPU for refreshing user-interface state, the device supports animated icon segments and blink patterns. The 80-TQFP package exposes dedicated SEG/COM pins, and the industrial -40C to +85C range suits outdoor meters and metering equipment in harsh environments.
Recommended
Battery-Powered IoT Sensor Hubs
Multiple low-power modes (Sleep, Deep Sleep, Retention) make the PIC24FJ128GU408T-I/PT a strong fit for battery-driven sensor hubs that aggregate temperature, humidity, and occupancy data. With the USB peripheral gated off and the RTCC running from a 32.768 kHz crystal, quiescent current drops into the microamp range, allowing multi-year operation from a CR2032 coin cell. The 12-bit ADC samples analog sensors directly without an external front-end, while 128 KB ECC Flash accommodates over-the-air (OTA) update images enabled by the Dual Partition feature. The 2.0 V minimum Vdd extends usable battery life to end-of-life. The integrated LCD driver can display local readings even without wireless connectivity.
Recommended
Industrial Point-of-Sale Terminals
POS terminals benefit from the combination of USB device connectivity (for host PCs), segment-LCD for receipt prompts and amount display, and ample Flash/RAM for transaction logging firmware. The 32 KB RAM allows transient storage of receipt data before spooling, while 128 KB ECC Flash holds the full application stack including EMV or NFC firmware modules. The PIC24 core's deterministic interrupt response and 16 MIPS throughput guarantee sub-millisecond button-press latency, and the 80-TQFP package offers the I/O count required for keypads, mag-stripe readers, and serial peripherals. Industrial temperature range ensures reliability in kitchens, warehouses, and outdoor kiosks.
Recommended
Medical Instrumentation Front Panels
Blood-pressure monitors, glucose meters, infusion pumps, and portable diagnostic devices need a compact, low-power MCU with display drive and USB connectivity for data upload to clinical software. The PIC24FJ128GU408T-I/PT's segment-LCD controller drives the patient readouts directly, while USB device mode transfers logged measurements to a PC. The 12-bit ADC supports sensor front-ends such as pressure transducers or optical pulse-oximetry chains. ECC Flash increases reliability for stored calibration constants and patient records. The industrial -40C to +85C temperature grade and medical EMC-friendly analog design help meet IEC 60601-1 collateral requirements.
Recommended
Connected Home and Smart-Home Gateways
Smart-home bridges, Zigbee/Thread border routers, and home-automation controllers leverage the USB host capability of the PIC24FJ128GU408T-I/PT to attach external radio dongles (Wi-Fi, sub-GHz) without additional MCUs. The 32 KB RAM buffers protocol stacks while 128 KB ECC Flash stores bridging firmware and OTA payloads via the Dual Partition feature. The integrated segment LCD displays network status, sensor counts, or pairing prompts locally. With 2.0-3.6 V operation, the device integrates easily with 3.3 V system rails typical of home gateways. The 80-TQFP package provides enough I/O for multiple UART/SPI/I2C connections to radios and sensors.
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Recommended Products Summary
Engineering reference data for PIC24FJ128GU408T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GU408-I/PT | PIC24FJ128GU406-I/PT | PIC24FJ128GU405-I/PT | PIC24FJ128GL410T-I/PT | PIC24FJ128GA610-I/PT |
|---|---|---|---|---|---|---|
| Package | 80-TQFP (12x12 mm) | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Flash | 128 KB ECC | 128 KB ECC | 64 KB | 64 KB | 128 KB | 128 KB |
| RAM | 32 KB | 32 KB | 16 KB | 16 KB | 32 KB | 32 KB |
| USB | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | No integrated USB |
| Segment LCD Driver | Yes (up to 512 segments) | Yes | Yes | Yes | Yes | Yes |
| Maximum 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 |
| 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 |
| Dual Partition Flash (OTA) | Yes | Yes | Yes | Yes | Yes | No |
| 1-unit Price (USD) | 7.12 | 6.90 | 6.40 | 6.20 | 7.05 | 6.50 |
Key Differentiators
- Highest memory density in the GU4/GL4 80-TQFP line (vs PIC24FJ128GU406-I/PT)
- Full-speed USB with on-chip PHY versus software-only stacks (vs PIC24FJ128GA610-I/PT)
- Dual Partition Flash enables fail-safe OTA updates (vs PIC24FJ128GA610-I/PT)
- Wider operating voltage range than competing PIC24F parts (vs PIC24FJ128GL405-I/PT)
Design Notes
Decouple all VDD/VSS pin pairs with 100 nF ceramic capacitors placed within 2 mm of each supply pin; add a single 4.7 uF bulk capacitor near the package. The VUSB3V3 pin requires its own 1 uF decoupling capacitor. Per Microchip hardware design guidelines, inadequate decoupling leads to USB enumeration failures and LCD segment ghosting. Multiple supply pins must be tied together externally for proper current distribution across the internal bond wires.
Do not leave the MCLR pin floating; tie it to VDD through a 10 kohm pull-up resistor and provide a tact-switch to ground for in-circuit reset. The MCLR pin is sensitive to fast edges; add a 100 nF capacitor across the switch for debounce and ESD protection. Floating MCLR is the leading cause of unexpected resets in PIC24F designs.
Route the USB D+/D- differential pair with 90 ohm differential impedance, matching lengths within 2 mm, and keeping them away from switching signals. Place the USB connector's shield ground connection directly to the board's ground plane with a short stitch. Per USB 2.0 specification, improper USB layout causes eye-pattern failures and intermittent disconnect issues. Add a ferrite bead on the Vbus line for EMI suppression.
For segment-LCD applications, the segment and common lines should be routed in parallel and shielded from switching digital signals. Add guard traces around LCD lines tied to VSS for capacitive coupling reduction. Per Microchip PIC24F LCD design guide, improper LCD routing causes contrast unevenness and segment crosstalk. Use a ground plane under the LCD region to maintain stable bias voltage reference.
Compliance Information
RoHS and lead-free compliance per Microchip product page and DigiKey listing. Industrial temperature grade -40C to +85C; not AEC-Q100 qualified for automotive applications.
