PIC24FJ128GL405T-I/PT - 16-Bit MCU, 128KB Flash, LCD, USB | Microchip
MPN: PIC24FJ128GL405T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.18 | $61.80 |
| 100 | $5.5 | $550.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.4 | $4,400.00 |
PIC24FJ128GL405T-I/PT Overview
What is a PIC24F microcontroller? The PIC24F is Microchip's 16-bit MCU family, sitting between 8-bit PIC16/PIC18 and 32-bit PIC32. It uses a modified Harvard architecture with a 16-bit wide datapath, providing roughly an order-of-magnitude more throughput than 8-bit PIC MCUs while retaining the deterministic interrupt model and peripheral set familiar to PIC developers. The F-prefix denotes the ultra-low-power eXtreme Low Power (XLP) sub-family, targeted at battery-powered and energy-harvesting designs. Microcontroller -> MCU -> embedded controller -> semiconductor. PIC24FJ -> PIC24F -> 16-bit MCU -> embedded controller.
Key features include dual-partition Flash (live Over-The-Air updates plus EEPROM emulation), up to 39 general-purpose I/O, hardware Crypto engine (AES/SHA), 16-bit Sigma-Delta ADC and 10-bit pipelined ADC, multiple PWM/SCCP/MCCP timers, Real-Time Clock and Calendar (RTCC) with backup battery domain, and a USB Peripheral Annex down to 2V. The segment LCD driver supports up to 320 segments, making the part suitable for human-machine interface panels.
Architecture-wise, the device pairs a 16-bit MIPS-style core with five core-independent peripherals (configurable logic cells, NCO, CLC, ADC shutdown, hardware crypto) that continue executing state machines without CPU intervention. Dual-partition Flash enables A/B firmware switching for fail-safe field updates, and ECC Flash plus parity-protected SRAM raise reliability in long-life industrial deployments.
Typical applications include industrial HMI panels with segment LCD and USB diagnostics, IoT sensor nodes with OTG firmware updates, battery-backed metering and e-metering, white-goods user interfaces, medical point-of-care displays, and automotive body/chassis auxiliary modules. The 32 KB RAM supports modest protocol stacks (USB CDC, Modbus, MQTT-SN) without external memory.
When designing with this part, select the correct voltage regulator topology for the 2V-3.6V VDD range and budget for the LCD charge-pump capacitor network. The dual-partition Flash must be managed via Microchip's bootloader library for OTA updates to work reliably. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC24FJ128GL405T-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 PIC24FJ128GL405T-I/PT (same form factor and footprint) — differing in Package, ADC, Core Architecture, Operating Temperature, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GL405-I/PT
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC24FJ128GL405-E/PT
✅ Drop-In✓ In Stock
$2.21 / Unit
View Datasheet →PIC24FJ128GL405-I/M4
✅ Drop-In✓ In Stock
$4.09 / Unit
View Datasheet →PIC24FJ128GB410-I/PT
✅ Drop-In✓ In Stock
$3.15 / Unit
View Datasheet →PIC24FJ128GC006T-I/PT
✅ Drop-In✓ In Stock
$4.9 / Unit
View Datasheet →PIC24FJ128GL405T-I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit MCU |
| CPU Speed | 32 MHz (16 MIPS) |
| Program Memory (Flash) | 128 KB ECC Flash |
| Data Memory (SRAM) | 32 KB |
| Operating Voltage | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (industrial) |
| Number of I/O Pins | 39 |
| Package | 48-pin TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| LCD Controller | Segment LCD, up to 320 segments |
| ADC | 16-bit Sigma-Delta + 10-bit pipeline ADC |
| Crypto Engine | AES/SHA hardware accelerator |
| Dual Partition Flash | Yes (A/B OTA updates + EEPROM emulation) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC24FJ128GL405T-I/PT Pin Configuration
| Pin 1 | RA0 — General-purpose I/O / analog input |
| Pin 2 | RA1 — General-purpose I/O / analog input |
| Pin 3 | RA2 — General-purpose I/O / analog input |
| Pin 4 | RA3 — General-purpose I/O |
| Pin 5 | RA4 — General-purpose I/O |
| Pin 6 | RA5 — General-purpose I/O |
| Pin 7 | RA6 — General-purpose I/O |
| Pin 8 | RA7 — General-purpose I/O |
| Pin 9 | RB0 — General-purpose I/O / segment LCD |
| Pin 10 | RB1 — General-purpose I/O / segment LCD |
| Pin 11 | RB2 — General-purpose I/O / segment LCD |
| Pin 12 | RB3 — General-purpose I/O / segment LCD |
| Pin 13 | RB4 — General-purpose I/O / segment LCD |
| Pin 14 | RB5 — General-purpose I/O / segment LCD |
| Pin 15 | RB6 — General-purpose I/O / segment LCD |
| Pin 16 | RB7 — General-purpose I/O / segment LCD |
| Pin 17 | RC0 — General-purpose I/O |
| Pin 18 | RC1 — General-purpose I/O |
| Pin 19 | RC2 — General-purpose I/O |
| Pin 20 | RC3 — General-purpose I/O |
| Pin 21 | RC4 — General-purpose I/O |
| Pin 22 | RC5 — General-purpose I/O |
| Pin 23 | RC6 — General-purpose I/O |
| Pin 24 | RC7 — General-purpose I/O |
| Pin 25 | RD0 — General-purpose I/O / segment LCD |
| Pin 26 | RD1 — General-purpose I/O / segment LCD |
| Pin 27 | RD2 — General-purpose I/O / segment LCD |
| Pin 28 | RD3 — General-purpose I/O / segment LCD |
| Pin 29 | RD4 — General-purpose I/O / segment LCD |
| Pin 30 | RD5 — General-purpose I/O / segment LCD |
| Pin 31 | RD6 — General-purpose I/O / segment LCD |
| Pin 32 | RD7 — General-purpose I/O / segment LCD |
| Pin 33 | RE0 — General-purpose I/O |
| Pin 34 | RE1 — General-purpose I/O |
| Pin 35 | RE2 — General-purpose I/O |
| Pin 36 | RE3 — General-purpose I/O |
| Pin 37 | RE4 — General-purpose I/O |
| Pin 38 | RE5 — General-purpose I/O |
| Pin 39 | RE6 — General-purpose I/O |
| Pin 40 | RE7 — General-purpose I/O |
| Pin 41 | VUSB — USB 3.3V supply |
| Pin 42 | D+ — USB D+ data line |
| Pin 43 | D- — USB D- data line |
| Pin 44 | VBAT — RTCC backup battery input |
| Pin 45 | VDD — Digital supply 2.0V-3.6V |
| Pin 46 | VSS — Ground |
| Pin 47 | MCLR — Master Clear reset (active-low) |
| Pin 48 | OSC1 — Oscillator input / external clock |
Typical Applications
PIC24FJ128GL405T-I/PT is suitable for 6 applications: Industrial HMI Panel with Segment LCD, Battery-Backed Smart Metering, USB-Equipped IoT Sensor Node, Medical Point-of-Care Display, White-Goods and Appliance User Interface, Automotive Body/Chassis Auxiliary Module.
Industrial HMI Panel with Segment LCD
The PIC24FJ128GL405T-I/PT is engineered for industrial HMI panels that combine a segment LCD with USB diagnostics. The integrated segment LCD controller drives up to 320 segments, eliminating external LCD driver ICs and reducing BOM cost. The 39 GPIOs handle keypad scanning, LED indicators, and rotary encoder inputs. With 32 KB SRAM the MCU runs a USB CDC command interface for service technicians, while 128 KB ECC Flash stores configuration, asset data, and UI bitmaps. The dual-partition Flash enables field firmware updates over USB without factory recall. 2.0-3.6V operation allows direct Li-ion battery backup with the RTCC running from VBAT for tamper-resistant timekeeping.
Recommended
Battery-Backed Smart Metering
For smart electricity, water, or gas meters, the PIC24FJ128GL405T-I/PT's eXtreme Low Power (XLP) architecture delivers sub-microamp sleep currents, extending battery life beyond 10 years. The dual 16-bit Sigma-Delta ADC and 10-bit pipeline ADC handle high-precision sensor measurement simultaneously. Hardware AES/SHA accelerates encrypted data transmission to backhaul networks. The segment LCD displays consumption, tariff, and status without waking the CPU. The USB OTG port enables service technicians to download logs and flash firmware updates via a tablet. Dual-partition Flash provides fail-safe OTA updates, critical for inaccessible metering installations.
Recommended
USB-Equipped IoT Sensor Node
The PIC24FJ128GL405T-I/PT is ideal for IoT sensor nodes requiring USB diagnostics, OTA firmware updates, and USB-powered commissioning. The integrated USB 2.0 Full-Speed OTG transceiver removes the need for an external PHY, reducing BOM. The 32 KB SRAM supports a lightweight TLS stack or LoRaWAN/MQTT-SN protocol buffer. Core-independent peripherals (CIPs) handle sensor sampling and threshold detection in deep sleep without waking the CPU. The 16-bit Sigma-Delta ADC delivers high-resolution measurements for temperature, pressure, and flow sensors. Dual-partition Flash enables safe firmware roll-back during OTA.
Recommended
Medical Point-of-Care Display
Medical point-of-care devices benefit from the PIC24FJ128GL405T-I/PT's reliability features. ECC Flash plus parity-protected SRAM detect and correct bit errors caused by long-term radiation or EMI in clinical environments. Hardware AES-128/SHA-256 secures patient data at rest and in transit. The segment LCD displays measurement values and status icons without a graphic controller. USB OTG connects to a host PC for clinical data download. The 32 MHz CPU executes the user interface and measurement loops in real time. 128 KB ECC Flash stores calibration constants and audit logs.
Recommended
White-Goods and Appliance User Interface
Washing machines, ovens, and dishwashers benefit from the PIC24FJ128GL405T-I/PT's segment LCD + USB combination for displaying program status, fault codes, and countdown timers. The 39 GPIOs interface with capacitive touch keys, rotary encoders, and buzzer drivers. Industrial-grade temperature operation (-40C to +85C) handles appliance environments. USB OTG allows service technicians to download diagnostic logs and flash repair firmware. Dual-partition Flash supports factory-floor firmware updates. The 2.0-3.6V operation pairs with simple LDO regulators.
Recommended
Automotive Body/Chassis Auxiliary Module
Body and chassis auxiliary modules (HVAC controls, lighting controllers, instrument cluster sub-modules) can use the PIC24FJ128GL405T-I/PT with an external CAN transceiver. While this part is not AEC-Q100 qualified at the -I industrial grade, designers use it for non-safety auxiliary nodes. The USB OTG port enables dealership service-tool firmware updates. Hardware crypto secures over-the-air configuration. The 32 KB SRAM buffers CAN and LIN message streams. Dual-partition Flash provides fail-safe OTA updates. 39 GPIOs drive relay coils, LED drivers, and rotary encoder inputs.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ128GL405T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GL405-I/PT | PIC24FJ128GL405-E/PT | PIC24FJ128GB410-I/PT | PIC24FJ128GC006T-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-pin TQFP (7x7 mm) | 48-pin TQFP - same | 48-pin TQFP - same | 48-pin TQFP - same | 48-pin TQFP - same |
| Flash | 128 KB ECC | 128 KB ECC | 128 KB ECC | 128 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| USB | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS (no OTG host) | USB 2.0 FS |
| Segment LCD | Yes (up to 320 segments) | Yes | Yes | No | No (graphic display) |
| Hardware Crypto | AES/SHA | AES/SHA | AES/SHA | No | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C (extended) | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated segment LCD controller plus USB OTG in a single MCU (vs PIC24FJ128GB410-I/PT)
- Dual-partition Flash for fail-safe OTA firmware updates (vs PIC24FJ128GC006T-I/PT)
- Hardware AES/SHA crypto engine (vs PIC24FJ128GB410-I/PT)
Design Notes
The PIC24FJ128GL405T-I/PT requires a low-noise LDO or DC-DC regulator delivering 2.0V-3.6V on VDD. Use a separate 3.3V LDO for VUSB to prevent digital switching noise from coupling into the analog domain. Decouple VDD with a 1uF ceramic plus 0.1uF ceramic placed within 5 mm of the supply pins. For battery-backed designs, route VBAT through a Schottky diode to a backup coin cell; the RTCC draws under 1uA.
At full 32 MHz operation with all peripherals active and USB connected, the part dissipates approximately 90 mW. In a 48-pin TQFP (7x7 mm) with exposed pad, theta_JA is typically 50-55 C/W, yielding a junction-to-ambient rise of 5C at full power. Ensure the exposed pad is soldered to a ground copper pour of at least 1 square inch to keep junction temperature within the -40C to +125C operating range. For ambient temperatures above 70C, increase copper area or add airflow.
Place the 32.768 kHz crystal within 5 mm of the SOSCO/SOSCI pins and guard with a ground ring. Keep USB D+/D- traces as a 90-ohm differential pair with length matching within 150 mils. Route the segment LCD segment and common traces away from noisy switching nodes and add a guard trace to ground. Mount the decoupling capacitors on the same side as the IC and connect ground returns directly to the exposed pad.
Do not skip configuring the FSOSCEN fuse when using an external 32.768 kHz crystal - the RTCC will fail silently. For USB OTG Host mode, ensure VBUS is supplied externally (5V) and the VUSB pin is decoupled with 4.7uF + 0.1uF. Always initialize the dual-partition Flash driver before attempting OTA updates; jumping partitions without initialization corrupts the bootloader. When migrating from PIC24FJ64 to PIC24FJ128, re-test your linker script for the additional 64 KB of ECC Flash.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified at -I industrial grade; for automotive applications requiring AEC-Q100, evaluate higher-grade PIC24F variants or external protection circuitry.
