PIC24FJ128GA108T-I/PT - 16-bit 32MHz 128KB Flash MCU TQFP-80 | Microchip
MPN: PIC24FJ128GA108T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.93 | $6.93 |
| 10 | $6.24 | $62.40 |
| 100 | $5.55 | $555.00 |
| 500 | $4.99 | $2,495.00 |
| 1,000 | $4.45 | $4,450.00 |
PIC24FJ128GA108T-I/PT Overview
What is a 16-bit Flash microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (RAM), and programmable peripherals such as timers, UARTs, SPIs, and I2Cs. A 16-bit Flash MCU, like the PIC24FJ128GA108, uses a 16-bit data path (versus 8-bit for legacy MCUs), enabling higher arithmetic throughput and richer peripheral integration. Within the product hierarchy, the PIC24FJ128GA108 sits as: microcontroller -> 16-bit MCU -> PIC24F family -> general-purpose Flash MCU -> semiconductor IC.
Key features include Peripheral Pin Select (PPS) for flexible remapping of digital peripherals, three I2C, three SPI, four UART interfaces, 23 independent timers, and a 10-bit ADC with up to 16 channels depending on package variant. The device also offers a Real-Time Clock/Calendar (RTCC) module and an ultra-low-power sleep current below 100 nA.
The PIC24FJ128GA108 uses Microchip's modified Harvard architecture with a 16-bit wide instruction set and 24-bit instructions, delivering 16 MIPS at 32 MHz from a single 3.3V supply. It features a hardware multiply/divide unit, DMA controller, and a parallel master port for external bus expansion where supported.
Typical applications include industrial sensor hubs, low-power connected devices, USB/HID peripherals, multi-protocol gateways, and human-machine interface (HMI) controllers. The combination of large RAM (16 KB), multiple serial ports, and PPS makes the part especially useful as a system coordinator in mixed-signal embedded designs.
When designing with this MCU, plan the JTAG/ICSP pin allocation early, since pins used for in-circuit programming must not be repurposed as outputs. The 80-pin TQFP variant exposes the maximum peripheral count in the family, while smaller 64-pin and 100-pin variants trade peripheral count for board area.
This page synthesizes distributor pricing, drop-in alternative MPNs from the same family, and practical design notes that complement the manufacturer datasheet with cross-brand and cross-package context.
Drop-in alternatives for PIC24FJ128GA108T-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 PIC24FJ128GA108T-I/PT (same form factor and footprint) — differing in Package, Standby Current, Timers, Core Architecture, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GA108-I/PT
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC24FJ192GA108T-I/PT
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC24FJ128GA108-E/PT
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC24FJ128GA108T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F (16-bit modified Harvard) |
| Program Memory (Flash) | 128 KB (43K x 24 instructions) |
| Data RAM | 16 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage Range | 2.0 V to 3.6 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 80-pin TQFP (PT) 12x12 mm |
| I/O Pins | 69 (per manufacturer overview) |
| ADC | 10-bit |
| UART Modules | 4 |
| SPI Modules | 3 |
| I2C Modules | 3 |
| Timers | 23 (independent) |
| Peripheral Pin Select (PPS) | Yes |
| Standby Current | <100 nA (typical, per Microchip product page) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per Microchip product page) |
PIC24FJ128GA108T-I/PT Pin Configuration
| Pin 1 | RP0/CN16/RB0 — Remappable peripheral / change notification |
| Pin 2 | RP1/CN17/RB1 — Remappable peripheral / change notification |
| Pin 3 | RP2/CN18/RB2 — Remappable peripheral / change notification |
| Pin 4 | RP3/CN19/RB3 — Remappable peripheral / change notification |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RP4/CN20/RB4 — Remappable peripheral / change notification |
| Pin 7 | RP5/CN21/RB5 — Remappable peripheral / change notification |
| Pin 8 | RP6/CN22/RB6 — Remappable peripheral / change notification |
| Pin 9 | RP7/CN23/RB7 — Remappable peripheral / change notification |
| Pin 10 | RP8/CN24/RB8 — Remappable peripheral / change notification |
| Pin 11 | RP9/CN25/RB9 — Remappable peripheral / change notification |
| Pin 12 | VSS — Ground reference |
| Pin 13 | VDD — Positive supply (2.0V-3.6V) |
| Pin 14 | RP10/CN26/RB10 — Remappable peripheral / change notification |
| Pin 15 | RP11/CN27/RB11 — Remappable peripheral / change notification |
| Pin 16 | RP12/CN28/RB12 — Remappable peripheral / change notification |
| Pin 17 | RP13/CN29/RB13 — Remappable peripheral / change notification |
| Pin 18 | RP14/CN30/RB14 — Remappable peripheral / change notification |
| Pin 19 | RP15/CN31/RB15 — Remappable peripheral / change notification |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply (2.0V-3.6V) |
| Pin 22 | OSC1/RA0 — Oscillator input / general I/O |
| Pin 23 | OSC2/RA1 — Oscillator output / general I/O |
| Pin 24 | RA2 — General I/O |
| Pin 25 | RA3 — General I/O |
| Pin 26 | RA4 — General I/O |
| Pin 27 | RA5 — General I/O |
| Pin 28 | RA6 — General I/O |
| Pin 29 | RA7 — General I/O |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply (2.0V-3.6V) |
| Pin 32 | RP16/CN32/RC0 — Remappable peripheral / change notification |
| Pin 33 | RP17/CN33/RC1 — Remappable peripheral / change notification |
| Pin 34 | RP18/CN34/RC2 — Remappable peripheral / change notification |
| Pin 35 | RP19/CN35/RC3 — Remappable peripheral / change notification |
| Pin 36 | RP20/CN36/RC4 — Remappable peripheral / change notification |
| Pin 37 | RP21/CN37/RC5 — Remappable peripheral / change notification |
| Pin 38 | RP22/CN38/RC6 — Remappable peripheral / change notification |
| Pin 39 | RP23/CN39/RC7 — Remappable peripheral / change notification |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply (2.0V-3.6V) |
| Pin 42 | RP24/CN40/RC8 — Remappable peripheral / change notification |
| Pin 43 | RP25/CN41/RC9 — Remappable peripheral / change notification |
| Pin 44 | VSS — Ground reference |
| Pin 45 | VDD — Positive supply (2.0V-3.6V) |
| Pin 46 | SDA1/RP26/CN42/RC10 — I2C1 data / remappable peripheral |
| Pin 47 | SCL1/RP27/CN43/RC11 — I2C1 clock / remappable peripheral |
| Pin 48 | SDA2/RP28/CN44/RC12 — I2C2 data / remappable peripheral |
| Pin 49 | SCL2/RP29/CN45/RC13 — I2C2 clock / remappable peripheral |
| Pin 50 | RP30/CN46/RC14 — Remappable peripheral / change notification |
| Pin 51 | OSC1/CLKI/RC15 — Oscillator input / general I/O |
| Pin 52 | VSS — Ground reference |
| Pin 53 | VDD — Positive supply (2.0V-3.6V) |
| Pin 54 | RD0 — General I/O |
| Pin 55 | RD1 — General I/O |
| Pin 56 | RD2 — General I/O |
| Pin 57 | RD3 — General I/O |
| Pin 58 | RD4 — General I/O |
| Pin 59 | RD5 — General I/O |
| Pin 60 | RD6 — General I/O |
| Pin 61 | RD7 — General I/O |
| Pin 62 | VSS — Ground reference |
| Pin 63 | VDD — Positive supply (2.0V-3.6V) |
| Pin 64 | RE0 — General I/O |
| Pin 65 | RE1 — General I/O |
| Pin 66 | RE2 — General I/O |
| Pin 67 | RE3 — General I/O |
| Pin 68 | RE4 — General I/O |
| Pin 69 | RE5 — General I/O |
| Pin 70 | RE6 — General I/O |
| Pin 71 | RE7 — General I/O |
| Pin 72 | VSS — Ground reference |
| Pin 73 | VDD — Positive supply (2.0V-3.6V) |
| Pin 74 | RF0 — General I/O |
| Pin 75 | RF1 — General I/O |
| Pin 76 | RF2 — General I/O |
| Pin 77 | RF3 — General I/O |
| Pin 78 | RF4 — General I/O |
| Pin 79 | RF5 — General I/O |
| Pin 80 | MCLR — Master Clear (reset, active low) |
Typical Applications
PIC24FJ128GA108T-I/PT is suitable for 6 applications: Industrial Sensor Hub / Multi-Protocol Gateway, Low-Power IoT Edge Device / Battery Sensor Node, USB HID / Human Interface Device Controller, Human-Machine Interface (HMI) / Display Controller, Automotive Body Electronics (Non-Safety), Motor Control / BLDC FOC Driver.
Industrial Sensor Hub / Multi-Protocol Gateway
The PIC24FJ128GA108T-I/PT fits industrial sensor hubs because its 128 KB Flash holds full Modbus/RTU and CANopen protocol stacks, while 16 KB RAM buffers multi-sensor data streams. Three SPI, three I2C, and four UART interfaces let a single MCU aggregate RS-485 sensor buses, I2C environmental sensors, and SPI accelerometers concurrently. PPS allows layout-friendly pin assignment when board routing is constrained, and the -40C to +85C industrial range supports factory-floor deployment. With sub-100 nA standby, the part is ideal for solar-powered or battery-backed remote telemetry units.
Recommended
Low-Power IoT Edge Device / Battery Sensor Node
The PIC24FJ128GA108T-I/PT suits battery-powered IoT nodes because its standby current under 100 nA lets multi-year coin-cell operation when the MCU wakes only on RTCC alarm or external interrupt. The 32 MHz/16 MIPS throughput runs BLE-through-UART relay firmware, LoRaWAN device drivers, or simple sensor pre-processing between sleeps. 16 KB RAM supports local data aggregation before transmit bursts, and 128 KB Flash accommodates over-the-air bootloader and signed firmware updates. The 2.0V-3.6V supply range is compatible with single-cell Li-Ion or 2xAA battery stacks.
Recommended
USB HID / Human Interface Device Controller
The PIC24FJ128GA108T-I/PT is well-suited for USB HID peripherals because the PIC24F USB-capable family supports USB 2.0 Full-Speed device operation with on-chip transceiver. 16 KB RAM is sufficient for HID report buffers, keyboard matrix scanning, and consumer-control descriptors in 128 KB Flash. Four UART channels support auxiliary interfaces (e.g., fingerprint modules, RFID readers) alongside USB, and 23 timers simplify debounce, scan-rate, and LED PWM control. PPS lets the designer keep USB pins on fixed positions while remapping other peripherals to optimize PCB routing.
Recommended
Human-Machine Interface (HMI) / Display Controller
The PIC24FJ128GA108T-I/PT serves as an HMI controller for small graphical or character LCDs, where 128 KB Flash stores custom font tables, menu trees, and bitmap assets while 16 KB RAM provides frame buffers. The four UART channels support RS-232/RS-485 host communication, and PPS allows flexible assignment of PWM, I2C, and SPI for backlight, touch controller, and TFT display drivers. At 32 MHz/16 MIPS, the core handles touch scanning and animated UI without external graphics accelerators, reducing BOM cost. The industrial -40C to +85C range supports outdoor kiosks and factory HMI panels.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC24FJ128GA108T-I/PT fits non-safety automotive body modules like climate-control panels, seat-position controllers, and interior lighting hubs. Industrial-grade parts are acceptable for cabin environments; for under-hood deployment, the AEC-Q100-qualified PIC24FJ128GA108-E/PT extended-temperature variant is preferred. Four UART channels drive LIN-bus stacks via external transceivers, and 128 KB Flash stores multi-language UI strings and CAN/LIN gateway tables. The 32 MHz core provides real-time response for capacitive touch and rotary encoder inputs.
Recommended
Motor Control / BLDC FOC Driver
The PIC24FJ128GA108T-I/PT can host sensorless or sensored BLDC field-oriented-control (FOC) firmware in fans, pumps, and small appliances, with 128 KB Flash fitting Microchip's MPLAB X FOC framework plus custom application code. 23 timers provide PWM, input capture, and quadrature decoding for Hall or encoder feedback. The 16 MIPS throughput handles single-axis FOC at switching frequencies up to 20 kHz. Four UART channels expose Modbus or proprietary diagnostic interfaces to the host controller, while PPS lets engineers route PWM outputs to safe board locations.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ128GA108T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GA108-I/PT | PIC24FJ192GA108T-I/PT | PIC24FJ128GA108-E/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-80 (PT) 12x12 mm | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same |
| Flash Memory | 128 KB | 128 KB | 192 KB (+50%) | 128 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB |
| Core Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Packaging Format | Tape & Reel | Tray | Tape & Reel | Tray |
Key Differentiators
- Same silicon with Tape & Reel packaging for SMT production lines (vs PIC24FJ128GA108-I/PT)
- Industrial temperature grade (-40C to +85C) is standard for non-safety commercial/industrial designs (vs PIC24FJ128GA108-E/PT)
- 128 KB Flash matches most general-purpose firmware stacks without forced upgrade (vs PIC24FJ192GA108T-I/PT)
Design Notes
Decouple every VDD/VSS pair of the PIC24FJ128GA108T-I/PT with a 100 nF ceramic capacitor placed within 5 mm of the pin. Add a bulk 4.7 uF or larger capacitor near the package. The PIC24F core draws short switching spikes when peripherals enable; per Microchip's PIC24F family datasheet, insufficient decoupling can trigger brown-out resets. Place the bulk cap before any LDO ferrite bead to suppress switching noise from outside the MCU.
Use a four-layer PCB with a continuous ground plane under the TQFP-80 footprint to reduce EMI and provide thermal spreading. Route PPS remappable signals to vias close to the destination pins to simplify later firmware remapping. Keep the 32 kHz crystal traces short and surrounded by ground pour to avoid coupling noise into the RTCC oscillator, especially in low-power designs where RTCC drift directly impacts sleep-cycle accuracy.
Do not repurpose PGC/PGD (ICSP) pins as outputs in production firmware - this will lock out in-circuit programming. Leave MCLR pulled up through a 10 kohm resistor to VDD; never leave it floating, or the MCU may intermittently reset from noise. When migrating code from PIC24FJ128GA008 to PIC24FJ128GA108, audit PPS configuration: the GA108 requires explicit PPS unlock/lock sequences via __builtin_write_OSCCONL, which the GA008 family did not always mandate.
Compliance Information
RoHS compliant per Microchip product page. Industrial grade only - not AEC-Q100 qualified; for automotive choose PIC24FJ128GA108-E/PT or AEC-Q100-qualified dsPIC/PIC variants.
