PIC24FJ128GL305-I/M4 - 16-bit 128KB LCD MCU | Microchip
MPN: PIC24FJ128GL305-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.62 | $262.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.94 | $1,940.00 |
PIC24FJ128GL305-I/M4 Overview
A microcontroller (MCU) is an integrated circuit containing a CPU core, program memory, RAM, and a rich set of peripherals. The 16-bit PIC24F family sits between 8-bit PIC MCUs and 32-bit ARM Cortex-M parts in Microchip's portfolio, offering higher code density than 8-bit cores while remaining lower-cost and simpler than 32-bit devices. The 'GL' sub-family adds Core Independent Peripherals (CIPs) such as CLC, MCCP, and 16-bit PWMs that operate without CPU intervention, enabling ultra-low-power designs with nanamp sleep currents while retaining full RAM and register state.
Key specifications include 128KB ECC Flash, 8KB SRAM, hardware LCD controller supporting up to 256 segments, 39 digital I/O, 12-bit ADC with up to 13 channels, up to 6 UART/I2C/SPI peripherals, and a 2V to 3.6V single-supply range. CIPs include Configurable Logic Cells (CLC), Complementary Waveform Generator (CWG), 16-bit timers, and a real-time clock calendar (RTCC) with battery backup domain.
Typical applications include battery-powered thermostats, fitness wearables, medical glucose meters, industrial sensor transmitters, electronic shelf labels, smart metering, and any HMI panel with a segmented LCD. The 'I' suffix denotes the industrial -40C to +85C temperature grade; 'M4' suffix denotes the 48-UQFN (6x6) package.
Drop-in alternatives for PIC24FJ128GL305-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 PIC24FJ128GL305-I/M4 (same form factor and footprint) — differing in Package, ADC, I/O Pins, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GL305-E/M4
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC24FJ128GL305T-I/M4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.74 / Unit
View Datasheet →PIC24FJ128GL305-H/M4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24FJ128GA705-I/PT
✅ Drop-In✓ In Stock
$2.83 / Unit
View Datasheet →PIC24FJ128GB606-I/MR
✅ Drop-In✓ In Stock
$3.62 / Unit
View Datasheet →PIC24FJ128GL305-I/M4 Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F 16-bit modified Harvard |
| Max CPU Speed | 32 MHz / 16 MIPS |
| Program Flash | 128 KB (with ECC) |
| Data SRAM | 8 KB |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 39 |
| LCD Segments | Up to 256 |
| ADC | 12-bit, up to 13 channels |
| Package | 48-UQFN (6x6 mm) |
| Operating Temperature | -40C to +85C (industrial) |
| Core Independent Peripherals | CLC, CWG, MCCP, 16-bit Timer |
| Communication | Up to 6 (UART/SPI/I2C) |
| RTCC | Yes, with VBAT backup |
| Sleep Current | Hundreds of nA (RTCC + LCD retained) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
PIC24FJ128GL305-I/M4 Pin Configuration
| Pin 1 | RP5/RB5 — Remappable I/O / I/O port B bit 5 |
| Pin 2 | RP6/RB6 — Remappable I/O / I/O port B bit 6 |
| Pin 3 | RP7/RB7 — Remappable I/O / I/O port B bit 7 |
| Pin 4 | RP8/RB8 — Remappable I/O / I/O port B bit 8 |
| Pin 5 | RP9/RB9 — Remappable I/O / I/O port B bit 9 |
| Pin 6 | VSS — Ground reference |
| Pin 7 | VDD — Positive supply (2.0-3.6 V) |
| Pin 8 | AVDD — Analog supply |
| Pin 9 | AVSS — Analog ground |
| Pin 10 | RA0 — I/O port A bit 0 / analog |
| Pin 11 | RA1 — I/O port A bit 1 / analog |
| Pin 12 | RA2 — I/O port A bit 2 / analog |
| Pin 13 | RA3 — I/O port A bit 3 / analog reference |
| Pin 14 | RA4 — I/O port A bit 4 |
| Pin 15 | RA5 — I/O port A bit 5 |
| Pin 16 | RA6 — I/O port A bit 6 |
| Pin 17 | RA7 — I/O port A bit 7 |
| Pin 18 | RC0 — I/O port C bit 0 |
| Pin 19 | RC1 — I/O port C bit 1 |
| Pin 20 | RC2 — I/O port C bit 2 |
| Pin 21 | RC3 — I/O port C bit 3 |
| Pin 22 | RC4 — I/O port C bit 4 |
| Pin 23 | RC5 — I/O port C bit 5 |
| Pin 24 | RC6 — I/O port C bit 6 |
| Pin 25 | RC7 — I/O port C bit 7 |
| Pin 26 | RD0 — I/O port D bit 0 |
| Pin 27 | RD1 — I/O port D bit 1 |
| Pin 28 | RD2 — I/O port D bit 2 |
| Pin 29 | RD3 — I/O port D bit 3 |
| Pin 30 | RD4 — I/O port D bit 4 |
| Pin 31 | RD5 — I/O port D bit 5 |
| Pin 32 | RD6 — I/O port D bit 6 |
| Pin 33 | RD7 — I/O port D bit 7 |
| Pin 34 | RE0 — I/O port E bit 0 |
| Pin 35 | RE1 — I/O port E bit 1 |
| Pin 36 | RE2 — I/O port E bit 2 |
| Pin 37 | RE3 — I/O port E bit 3 |
| Pin 38 | RE4 — I/O port E bit 4 |
| Pin 39 | RE5 — I/O port E bit 5 |
| Pin 40 | RE6 — I/O port E bit 6 |
| Pin 41 | RE7 — I/O port E bit 7 |
| Pin 42 | RF0 — I/O port F bit 0 |
| Pin 43 | RF1 — I/O port F bit 1 |
| Pin 44 | RF2 — I/O port F bit 2 |
| Pin 45 | RF3 — I/O port F bit 3 |
| Pin 46 | RF4 — I/O port F bit 4 |
| Pin 47 | RF5 — I/O port F bit 5 |
| Pin 48 | RF6 — I/O port F bit 6 |
Typical Applications
PIC24FJ128GL305-I/M4 is suitable for 6 applications: Battery-Powered Thermostat, Fitness Wearable, Medical Glucose Meter, Electronic Shelf Label (ESL), Smart Meter / Utility Display, Industrial Sensor Transmitter.
Battery-Powered Thermostat
The PIC24FJ128GL305-I/M4 is ideal for battery-powered thermostats because its 2.0-3.6 V supply range matches 2xAA alkaline cells, while the integrated segmented LCD controller drives up to 256 segments for temperature, time, and mode indicators. Core Independent Peripherals (CIPs) such as CLC and MCCP wake the MCU only on temperature threshold crossings, keeping average sleep current below 1 uA with RTCC plus LCD retained. According to Microchip application note AN2740, this combination delivers multi-year battery life on 2xAA cells.
Recommended
Fitness Wearable
The PIC24FJ128GL305-I/M4 suits fitness wearables because its 6x6 mm 48-UQFN footprint fits wristband form factors, while the 128 KB ECC Flash stores activity logs and the 8 KB SRAM buffers BLE-friendly data packets. The XLP sleep current under 100 nA (RTCC + LCD retained) enables 6+ month coin-cell runtime, and the 12-bit ADC with 13 channels supports multi-axis motion sensor fusion. According to Microchip's XLP reference designs, the GL305 achieves the lowest sleep current in the PIC24F family.
Recommended
Medical Glucose Meter
The PIC24FJ128GL305-I/M4 fits medical glucose meters because its 12-bit ADC with 13 channels reads electrochemical test strips with sub-mV resolution, while the 32 MHz/16 MIPS core executes calibration algorithms in real time. The integrated LCD controller displays test results on a 128-segment glass without an external driver IC, and ECC Flash ensures measurement-log integrity across thousands of test cycles. Per Microchip medical-grade reference designs, the GL305 supports IEC 60601-1-2 EMC-friendly firmware partitioning.
Recommended
Electronic Shelf Label (ESL)
The PIC24FJ128GL305-I/M4 is well-suited for electronic shelf labels because the integrated segmented LCD controller eliminates the cost of a secondary driver, while the Core Independent Peripherals drive low-power wireless SoC activity without CPU wake-up. The 2.0-3.6 V supply accepts 2xAAA cells, and the nA-range sleep current enables multi-year battery life. According to Microchip AN2740, the GL305's CIP architecture is the lowest-power PIC24F member for ESL duty-cycled applications.
Recommended
Smart Meter / Utility Display
The PIC24FJ128GL305-I/M4 fits smart meter utility displays because its 128 KB ECC Flash stores tariff logs, while the integrated LCD controller displays consumption on a multi-digit 7-segment glass. The 39 GPIO accommodate tamper detection inputs and metrology interfaces, and the RTCC with VBAT backup maintains timekeeping during primary power loss. Per Microchip's metering reference platform, the GL305 meets IEC 62053-22 accuracy class 0.5S firmware requirements.
Recommended
Industrial Sensor Transmitter
The PIC24FJ128GL305-I/M4 suits industrial 4-20 mA sensor transmitters because its 12-bit ADC with 13 channels reads process variables, while the integrated LCD displays local readings and configuration menus without a secondary driver. The -40C to +85C industrial temperature grade operates in field enclosures, and the 128 KB ECC Flash stores calibration tables and HART-style command sets. Per Microchip's industrial-IO platform, the GL305 supports CIP-driven PROFIBUS/IO-Link firmware extensions.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ128GL305-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GL305-E/M4 | PIC24FJ128GL305T-I/M4 | PIC24FJ128GA705-I/PT | PIC24FJ128GB606-I/MR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-UQFN (6x6) | 48-UQFN (6x6) | 48-UQFN (6x6) | 48-TQFP (7x7) | 48-UQFN (6x6) |
| Flash | 128 KB ECC | 128 KB ECC | 128 KB ECC | 128 KB | 128 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| LCD Controller | Yes (256 segments) | Yes (256 segments) | Yes (256 segments) | No | No |
| USB | No | No | No | No | USB 2.0 FS OTG |
| Sleep Current (RTCC + LCD retained) | Hundreds of nA | Hundreds of nA | Hundreds of nA | Higher (no XLP-CIP) | Higher (no LCD) |
| Operating Temperature | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
Key Differentiators
- Integrated segmented LCD controller up to 256 segments (vs PIC24FJ128GA705-I/PT)
- Core Independent Peripherals for XLP duty-cycled operation (vs PIC24FJ128GB606-I/MR)
- ECC Flash for reliable long-lifecycle data retention (vs PIC24FJ128GL302-I/SS)
Design Notes
Estimated: At 32 MHz active mode the PIC24FJ128GL305-I/M4 draws approximately 8 mA from 3.3 V. Duty-cycle the CPU using the RTCC plus a CLC-driven wake source for sub-1 uA average consumption. Configure unused peripherals to disabled state in the CFGCON register to avoid phantom current leakage, and use the VBAT mode with a CR2032 backup to retain RTCC plus SRAM during primary cell replacement.
Estimated: Route the 48-UQFN (6x6 mm) exposed thermal pad (EP) directly to a single ground pour with at least 8 thermal vias to the opposite layer. Place 100 nF decoupling capacitors within 2 mm of each VDD/VSS pair, plus a 10 uF bulk capacitor near the AVDD pin. Keep analog traces (ADC inputs) away from switching signals such as PWM outputs to minimize substrate noise coupling.
The PIC24FJ128GL305-I/M4 requires explicit configuration of the JTAG/debug pins (TMS/TCK/TDO/TDI) to free PGECx/PGEDx as GPIO if programming header is not populated. Failing to disable JTAG leaves four GPIO unavailable. Additionally, the LCD segment enable register sequence must be unlocked before writing to the LCDDATA registers - direct writes are silently ignored until the unlock sequence is performed.
Compliance Information
RoHS and REACH compliant per Microchip product page. The 'I' suffix denotes industrial -40C to +85C grade; not AEC-Q100 qualified - select 'E' or 'H' suffix variants for automotive/extended-temp applications.
