PIC24FJ128GL302-E/SS - 16-bit 128KB Flash MCU w/ LCD | Microchip
MPN: PIC24FJ128GL302-E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.28 | $4.28 |
| 10 | $3.91 | $39.10 |
| 100 | $3.42 | $342.00 |
| 500 | $2.96 | $1,480.00 |
| 1,000 | $2.61 | $2,610.00 |
| 3,000 | $2.31 | $6,930.00 |
PIC24FJ128GL302-E/SS Overview
A PIC microcontroller (MCU) is a self-contained system-on-chip that integrates a processor core, non-volatile program memory (Flash), volatile working memory (SRAM), and programmable peripherals on a single die. Microcontrollers sit at the bottom of the embedded computing stack — below microprocessors and SoCs — and serve as deterministic, low-cost compute nodes for sensor interfacing, control loops, and human-machine interfaces in resource-constrained battery-powered products.
The PIC24FJ 'GL' family extends core-independent operation into the LCD subsystem, allowing segmented displays to be animated without CPU intervention. Key features include 4KB EEPROM, a 10-bit ADC up to 1.1 Msps, four 16-bit timers, four DMA channels, and up to 25 mappable I/O pins. The architecture retains RAM content in deep sleep, enabling wake events down to a few hundred nanoamps — a critical figure for thermostat, utility meter, and wearable applications.
Typical applications for the PIC24FJ128GL302-E/SS include battery-powered thermostats with segmented LCDs, portable medical monitors, e-metering and energy-harvesting endpoints, IoT sensor hubs, and human-machine interface panels. The combination of XLP retention modes and LCD charge-pump operation enables glass driving from a single lithium coin cell for multi-year service life.
When designing with this device, budget I/O carefully — the 28-pin SSOP pinout constrains pin count versus 44- and 64-pin variants, and the on-chip LCD charge pump must be configured before display voltage generation. Decoupling per VDD/VSS pair with 100nF X7R ceramics is recommended per the Microchip reference design. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC24FJ128GL302-E/SS — 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 PIC24FJ128GL302-E/SS (same form factor and footprint) — differing in Operating Temperature, Package, ADC, Core, Operating Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ128GL302-I/SS
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC24FJ128GL302-E/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ128GL306-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ128GB202-E/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC24FJ64GL302-E/SS
✅ Drop-In✓ In Stock
$3.48 / Unit
View Datasheet →PIC24FJ128GA202-E/SS
✅ Drop-In✓ In Stock
$2.6 / Unit
View Datasheet →PIC24FJ128GL302-E/SS Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit |
| Program Memory (Flash) | 128 KB (128K x 8) with ECC |
| RAM | 8 KB |
| Max CPU Speed | 32 MHz / 16 MIPS |
| Operating Voltage | 2.0 V to 3.6 V |
| Operating Temperature | -40C to +125C (E-temp) |
| Package | 28-pin SSOP (SS, 0.65 mm pitch) |
| ADC | 10-bit, up to 1.1 Msps |
| LCD Controller | Segmented LCD with charge pump, up to 168 segments |
| Timers | 4 x 16-bit |
| DMA Channels | 4 |
| Core Independent Peripherals (CIPs) | Yes (CLC, CWG, MCCP/SCCP, RTCC) |
| Communications | I2C, SPI, UART |
| RoHS Status | Compliant |
PIC24FJ128GL302-E/SS Pin Configuration
| Pin 1 | RA0 — Analog/Digital I/O; segment driver |
| Pin 2 | RA1 — Analog/Digital I/O; segment driver |
| Pin 3 | RA2 — Analog/Digital I/O; segment driver |
| Pin 4 | RA3 — Analog/Digital I/O; segment driver |
| Pin 5 | RA4 — Analog/Digital I/O; segment driver |
| Pin 6 | RA5 — Analog/Digital I/O; segment driver |
| Pin 7 | RA6 — Analog/Digital I/O; segment driver |
| Pin 8 | RA7 — Analog/Digital I/O; segment driver |
| Pin 9 | VSS — Ground reference |
| Pin 10 | RA9 — Digital I/O; segment driver |
| Pin 11 | RA10 — Digital I/O; segment driver |
| Pin 12 | RA11 — Digital I/O; segment driver |
| Pin 13 | RA12 — Digital I/O; segment driver |
| Pin 14 | RA13 — Digital I/O; segment driver |
| Pin 15 | RA14 — Digital I/O; segment driver |
| Pin 16 | RA15 — Digital I/O; segment driver |
| Pin 17 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 18 | VSS — Ground reference |
| Pin 19 | RB0 — Digital I/O; segment driver; PGED1 |
| Pin 20 | RB1 — Digital I/O; segment driver; PGEC1 |
| Pin 21 | RB2 — Digital I/O; segment driver |
| Pin 22 | RB3 — Digital I/O; segment driver |
| Pin 23 | RB4 — Digital I/O; segment driver |
| Pin 24 | RB5 — Digital I/O; segment driver |
| Pin 25 | RB6 — Digital I/O; segment driver |
| Pin 26 | RB7 — Digital I/O; segment driver |
| Pin 27 | RB8 — Digital I/O; segment driver |
| Pin 28 | RB9 — Digital I/O; segment driver |
Typical Applications
PIC24FJ128GL302-E/SS is suitable for 6 applications: Battery-Powered Thermostat with Segmented LCD, Portable Medical Monitor (Glucose Meter / Pulse Oximeter), Electronic Metering / Utility Endpoint, IoT Sensor Hub / Wireless HMI Node, Wearable Fitness / Health Band, Industrial HMI Panel / Appliance Front Panel.
Battery-Powered Thermostat with Segmented LCD
The PIC24FJ128GL302-E/SS is purpose-built for battery-powered thermostats thanks to its integrated segmented LCD controller and XLP low-power architecture. The on-chip charge pump drives the LCD glass directly from a single CR2032 coin cell, eliminating the external bias regulator that would otherwise drain the battery. With deep-sleep currents in the few-hundred-nA range while retaining RAM and the LCD frame buffer, the device enables multi-year service life on a primary cell, while the 16 MIPS PIC24F core handles HVAC control logic, setpoint scheduling, and wireless sensor input from external radios.
Recommended
Portable Medical Monitor (Glucose Meter / Pulse Oximeter)
Portable medical monitors require deterministic low-power operation and EMI-robust ADC performance. The PIC24FJ128GL302-E/SS delivers a 10-bit ADC up to 1.1 Msps and core-independent sampling via DMA, offloading sensor acquisition from the CPU. The 128KB ECC Flash provides safe firmware storage for FDA Class II / IEC 62304-compliant devices, while the segmented LCD interface drives the user-facing result display without an external driver IC. The XLP retention modes enable standby currents low enough for coin-cell or rechargeable Li-ion operation over a multi-day patient monitoring cycle.
Recommended
Electronic Metering / Utility Endpoint
Smart electricity, gas, and water meters demand years of unattended operation from a primary battery, deterministic pulse counting, and tamper-resistant storage. The PIC24FJ128GL302-E/SS delivers RTC-driven wake events from its RTCC CIP, on-chip EEPROM for non-volatile metering logs, and LCD segment driving for kWh/gallons displays without waking the CPU. ECC Flash protects firmware integrity across the 10+ year service life typical of utility endpoints, and the extended -40C to +125C temperature grade supports outdoor meter installations in extreme climates.
Recommended
IoT Sensor Hub / Wireless HMI Node
IoT sensor hubs and wireless human-machine-interface nodes combine local display, button input, and a sub-GHz or BLE radio for cloud connectivity. The PIC24FJ128GL302-E/SS acts as the local controller: it scans the keypad via CLC-driven CIP logic, drives the segmented LCD for status feedback, and hosts the UART/SPI interface to the radio module. With DMA-fed I/O, the CPU only wakes when actionable events occur — keeping average current under 1 mA even with a 32 MHz active core duty cycle. The 28-SSOP footprint fits sub-30 mm² PCB designs.
Recommended
Wearable Fitness / Health Band
Wearables must last days on a small Li-ion or coin-cell battery while driving an always-on segmented display for steps, heart rate, and notifications. The PIC24FJ128GL302-E/SS achieves sub-microamp deep-sleep with full LCD-frame retention, so the wrist display stays visible without spinning the core. The 16 MIPS PIC24F core handles step-counting algorithms, I2C communication with the heart-rate sensor, and BLE companion-radio handshakes. DMA and CIPs offload the SPI sensor stream so the CPU only wakes on completion interrupts.
Recommended
Industrial HMI Panel / Appliance Front Panel
Industrial HMI panels and white-good appliance front panels need a rugged MCU driving segment LCDs across wide temperature swings. The PIC24FJ128GL302-E/SS's -40C to +125C extended grade supports dishwasher control boards, oven interfaces, and factory-floor keypads. The four CLCs and configurable logic cell peripherals let designers replace discrete glue logic with on-chip state machines, reducing BOM cost and PCB area. UART/SPI/I2C interfaces connect to the main appliance controller or motor-driver board.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ128GL302-E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ128GL302-I/SS | PIC24FJ128GL302-E/SP | PIC24FJ128GL306-E/SS | PIC24FJ64GL302-E/SS | PIC24FJ128GB202-E/SS | PIC24FJ128GA202-E/SS |
|---|---|---|---|---|---|---|---|
| Package | 28-pin SSOP (0.65 mm pitch) | 28-pin SSOP - same | 28-pin SPDIP - same footprint family, different package | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB ECC | 128 KB ECC | 128 KB ECC | 64 KB | 64 KB | 128 KB | 128 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Temperature Grade | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) |
| LCD Controller | Yes (segmented + charge pump) | Yes (segmented + charge pump) | Yes (segmented + charge pump) | Yes (segmented + charge pump) | Yes (segmented + charge pump) | No (USB + 12-bit ADC instead) | No |
| ADC | 10-bit, up to 1.1 Msps | 10-bit, up to 1.1 Msps | 10-bit, up to 1.1 Msps | 10-bit, up to 1.1 Msps | 10-bit, up to 1.1 Msps | 12-bit, up to 1.1 Msps | 10-bit |
| Core Independent Peripherals | CLC, CWG, MCCP/SCCP, RTCC, DMA | CLC, CWG, MCCP/SCCP, RTCC, DMA | CLC, CWG, MCCP/SCCP, RTCC, DMA | CLC, CWG, MCCP/SCCP, RTCC, DMA | CLC, CWG, MCCP/SCCP, RTCC, DMA | CLC, CWG, RTCC, DMA | CLC, RTCC |
Key Differentiators
- On-chip segmented LCD controller with charge pump eliminates external bias IC (vs PIC24FJ128GB202-E/SS)
- XLP deep-sleep retention with sub-uA current (vs PIC24FJ128GA202-E/SS)
- ECC Flash protects firmware integrity over 10+ year service life (vs PIC24FJ128GL306-E/SS (lower Flash density))
Design Notes
Configure the LCD charge pump before enabling segment output. The Microchip datasheet recommends enabling the charge pump 50 ms before enabling display refresh, otherwise the glass may show ghosting at power-up. For deep-sleep retention, place the LCD in 'retention mode' rather than fully powering down — this keeps display RAM while reducing charge-pump consumption to a few hundred nA.
Estimated: At 32 MHz active and 3.3V supply, the PIC24FJ128GL302-E/SS draws approximately 8 mA. Over the -40C to +125C extended grade, ambient placement inside an enclosed thermostat or industrial panel will limit self-heating since SSOP-28 with exposed-pad variants reaches well below 1 W total dissipation. No external heatsink is required; instead, ensure PCB copper pour covers the exposed thermal pad (where present) and tie VSS pours together under the package.
Place a 100 nF X7R decoupling capacitor on each VDD/VSS pair within 2 mm of the package pins. For SSOP-28 with multiple VDD pins, use one 100 nF per pin and one bulk 10 uF ceramic near the package center. Keep the segmented LCD traces away from switching power and clock lines, and route the LCD backplane (BP/CP) signals on a separate layer or with a guard ring to minimize cross-talk into the analog ADC inputs.
Do not skip the configuration bit settings for the oscillator and watchdog — leaving the default FRC oscillator without PLL lock can cause intermittent operation at temperature extremes. Also, the ECC Flash requires a software initialization sequence at startup; firmware must call the ECC enable routine before relying on bit-error correction, otherwise ECC interrupts can fire unexpectedly on first reads.
For segmented LCD designs, the LCD segment and common lines are highly capacitive; route them on a single layer with maximum spacing to digital switching signals. The Microchip 'Segmented LCD Display Design' application note (DS39744) provides trace-width and spacing guidelines for SSOP-28 designs targeting 168 segments. Keep analog sensor traces (e.g., MCP9700 temperature sensor) short and away from backplane PWM edges.
Compliance Information
Microchip PIC24FJ128GL302 family is RoHS/REACH compliant per product page. Not AEC-Q100 qualified — for automotive applications refer to Microchip's dsPIC33/PIC32MK AEC-Q100 portfolio. Lead-free and halogen-free per Microchip Microchip GREEN compliance program.
