PIC24FJ512GL405-I/M4 - 512KB Flash 16-bit MCU | Microchip
MPN: PIC24FJ512GL405-I/M4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.41 | $1,705.00 |
| 1,000 | $3.04 | $3,040.00 |
| 3,000 | $2.71 | $8,130.00 |
PIC24FJ512GL405-I/M4 Overview
A microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of on-chip peripherals such as timers, ADC, communication controllers, and GPIOs. Within the broader taxonomy, the PIC24FJ512GL405 belongs to the 16-bit MCU tier, positioned above 8-bit AVR/PIC16 parts and below 32-bit Cortex-M/Arm parts. It is optimized for low-power, mixed-signal embedded designs where deterministic interrupt response and rich CIPs (Core Independent Peripherals) reduce CPU load.
Key features include hardware crypto (AES, SHA) and true RNG for secure boot, dual-partition Flash enabling live OTA firmware swap with zero downtime, an integrated segmented LCD driver up to 488 segments, USB 2.0 full-speed with on-chip transceiver, and Microchip's eXtreme Low-Power (XLP) technology that drops run current to under 1 µA in deep sleep. Twelve CIPs run autonomously from the CPU, allowing event-driven designs with minimal firmware overhead.
The architecture is a Modified Harvard 16-bit core with hardware multiply/divide, a 24-bit instruction word, and a 32 KB RAM with DMA. Its on-chip peripherals include multiple UART/SPI/I2C, 12-bit ADC, comparators, PWM, RTCC, and a charge time measurement unit (CTMU). The Dual Partition Flash layout lets one partition run while the other is reprogrammed, then boot-swap for rollback-safe OTA.
Typical applications include secure IoT edge nodes with OTA firmware update, USB-CDC medical and industrial instrumentation, segment-LCD thermostats and metering HMIs, low-power wireless sensor hubs, and battery-backed home automation panels. The 48-UQFN footprint suits space-constrained PCBs.
When designing, allocate the USB D+/D- traces as a 90 Ω differential pair and place the 48-UQFN exposed pad on a continuous ground pour for thermal and EMI performance. Verify OTP lock bits and Flash partition configuration in MPLAB X IDE before production signing.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC24FJ512GL405-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 PIC24FJ512GL405-I/M4 (same form factor and footprint) — differing in Family, LCD Controller, Package, USB, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ512GU405-I/M4
✅ Drop-In✓ In Stock
$3.33 / Unit
View Datasheet →PIC24FJ256GU405-I/M4
✅ Drop-In📋 Reference alternative (not in catalog)
PIC24FJ512GL405-I/M4 Maximum Ratings & Electrical Characteristics
| Product Type | 16-bit Microcontroller (MCU) |
| Core Architecture | PIC24F (Modified Harvard, 16-bit) |
| Family | PIC24FJ GL4 |
| Program Memory (Flash) | 512 KB (Dual Partition) |
| ECC Flash | 256 KB (with error correction) |
| SRAM | 32 KB |
| CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage | 2.0 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| USB | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| LCD Controller | Segmented LCD, up to 488 segments |
| Package | 48-UQFN (6x6 mm) |
| ADC | 12-bit, multi-channel |
| Crypto Accelerator | AES, SHA, True RNG |
| Core Independent Peripherals (CIPs) | Yes (12x CIP) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Programming/Debug | ICSP via PGECx/PGEDx pairs |
PIC24FJ512GL405-I/M4 Pin Configuration
| Pin 1 | RA0 — Digital I/O / analog input |
| Pin 2 | RA1 — Digital I/O / analog input |
| Pin 3 | RA2 — Digital I/O / analog input |
| Pin 4 | RA3 — Digital I/O / analog input |
| Pin 5 | VDD — Positive supply (2.0-3.6 V) |
| Pin 6 | VSS — Ground reference |
| Pin 7 | RB0 — Digital I/O / PGED1 programming data |
| Pin 8 | RB1 — Digital I/O / PGEC1 programming clock |
| Pin 9 | RB2 — Digital I/O |
| Pin 10 | RB3 — Digital I/O |
| Pin 11 | RB4 — Digital I/O |
| Pin 12 | RB5 — Digital I/O |
| Pin 13 | RB6 — Digital I/O |
| Pin 14 | RB7 — Digital I/O |
| Pin 15 | RC0 — Digital I/O |
| Pin 16 | RC1 — Digital I/O |
| Pin 17 | RC2 — Digital I/O |
| Pin 18 | RC3 — Digital I/O / SDA1 |
| Pin 19 | RC4 — Digital I/O / SCL1 |
| Pin 20 | VSS — Ground reference |
| Pin 21 | RC5 — Digital I/O |
| Pin 22 | RC6 — Digital I/O / TX1 |
| Pin 23 | RC7 — Digital I/O / RX1 |
| Pin 24 | RC8 — Digital I/O |
| Pin 25 | RC9 — Digital I/O |
| Pin 26 | D+ — USB D+ (differential data) |
| Pin 27 | D- — USB D- (differential data) |
| Pin 28 | VBUS — USB VBUS sense input |
| Pin 29 | VUSB — USB internal transceiver supply |
| Pin 30 | RD0 — Digital I/O |
| Pin 31 | RD1 — Digital I/O |
| Pin 32 | RD2 — Digital I/O |
| Pin 33 | RD3 — Digital I/O |
| Pin 34 | RD4 — Digital I/O |
| Pin 35 | RD5 — Digital I/O |
| Pin 36 | RD6 — Digital I/O |
| Pin 37 | RD7 — Digital I/O |
| Pin 38 | RE0 — Digital I/O |
| Pin 39 | RE1 — Digital I/O |
| Pin 40 | RE2 — Digital I/O |
| Pin 41 | RE3 — Digital I/O |
| Pin 42 | RF0 — Digital I/O / SEG/LCD driver |
| Pin 43 | RF1 — Digital I/O / SEG/LCD driver |
| Pin 44 | RF2 — Digital I/O / SEG/LCD driver |
| Pin 45 | RF3 — Digital I/O / SEG/LCD driver |
| Pin 46 | RF4 — Digital I/O / COM/LCD driver |
| Pin 47 | RF5 — Digital I/O / COM/LCD driver |
| Pin 48 | EP — Exposed thermal pad (connect to VSS) |
Typical Applications
PIC24FJ512GL405-I/M4 is suitable for 6 applications: Secure IoT Edge Node with OTA Update, USB-CDC Medical Instrumentation, Segmented-LCD Thermostat HMI, Industrial Metering with LCD Display, Low-Power Wireless Sensor Hub, Battery-Backed Home Automation Panel.
Secure IoT Edge Node with OTA Update
The PIC24FJ512GL405-I/M4 is well-suited as a secure IoT edge node MCU thanks to its 512 KB Dual Partition Flash with rollback-safe OTA firmware swap, on-chip USB 2.0 Full-Speed for tethered provisioning, and 12 Core Independent Peripherals that handle sensor polling autonomously. Its eXtreme Low-Power (XLP) sleep current drops below 1 µA in deep sleep, so battery-powered nodes can last years on a single CR2032 coin cell while still streaming MQTT-over-USB or BLE-passthrough telemetry.
Recommended
USB-CDC Medical Instrumentation
In USB-CDC medical instrumentation such as handheld pulse oximeters, digital stethoscopes, and bedside telemetry probes, the PIC24FJ512GL405-I/M4 delivers deterministic 16-MIPS throughput for filtering and DSP, while its on-chip USB 2.0 Full-Speed transceiver eliminates an external PHY and BOM cost. The 32 KB SRAM is sufficient for USB endpoint buffering plus a 4-ksample FIR filter ring buffer, and the 2.0-3.6 V range allows direct Li-ion operation with hardware brown-out reset for patient-safety compliance.
Recommended
Segmented-LCD Thermostat HMI
For wall-mounted HVAC thermostats, water-heater controllers, and home-energy displays, the PIC24FJ512GL405-I/M4 integrates a segmented LCD driver capable of driving up to 488 segments with no external charge-pump circuitry, reducing BOM by 3-5 dollars versus discrete driver solutions. The 512 KB Flash holds multilingual UI strings and Modbus/BACnet stacks, while XLP sleep keeps total quiescent draw under 50 µA so the thermostat can run for years on backup batteries during power loss events.
Recommended
Industrial Metering with LCD Display
In three-phase energy meters, water-flow totalizers, and gas-utility smart endpoints, the PIC24FJ512GL405-I/M4 provides the segmented-LCD driver for numeric readouts, the 12-bit ADC for shunt-current sensing, and the 32 KB SRAM for tariff-schedule buffers. Its hardware math accelerator (MAC) speeds IEC 62053 class-1 metering math, and the 48-UQFN 6×6 mm footprint fits within compact meter enclosures while the industrial -40 to +85 °C rating handles outdoor cabinet environments.
Recommended
Low-Power Wireless Sensor Hub
As a wireless sensor hub front-end for Zigbee, LoRa, or sub-GHz proprietary networks, the PIC24FJ512GL405-I/M4 acts as the host MCU managing the radio via SPI while its DMA engine moves packets without CPU wakeup. The 512 KB Dual Partition Flash supports OTA radio-firmware updates, and XLP deep-sleep under 1 µA keeps quiescent power negligible compared to the radio's own consumption, extending battery life of remote solar-powered sensor stations to 5+ years.
Recommended
Battery-Backed Home Automation Panel
In wall-mounted home-automation panels with segmented-LCD status displays, capacitive-touch sliders, and USB service ports, the PIC24FJ512GL405-I/M4 combines USB 2.0 Full-Speed for firmware update, 32 KB RAM for Zigbee/Z-Wave command buffers, and 12 CIPs that offload PWM dimming and event timing. The 2.0-3.6 V range supports direct Li-ion battery backup with on-chip brown-out, and the 48-UQFN footprint leaves board space for a 2.4 GHz radio module plus antenna keep-out.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ512GL405-I/M4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ512GU405-I/M4 | PIC24FJ256GU405-I/M4 | PIC24FJ256GL405-I/PT | PIC24FJ256GU406-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-UQFN (6x6 mm) | 48-UQFN (6x6 mm) - same | 48-UQFN (6x6 mm) - same | TQFP-64 - different footprint | TQFP-64 - different footprint |
| Flash Memory | 512 KB Dual Partition | 512 KB Dual Partition | 256 KB Dual Partition | 256 KB Dual Partition | 256 KB Dual Partition |
| ECC Flash | 256 KB | 256 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| CPU Speed | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Hardware Crypto | No (AES/SHA in GU4 only) | Yes (AES/SHA/RNG) | Yes (AES/SHA/RNG) | No | Yes (AES/SHA/RNG) |
| USB 2.0 FS | Yes (on-chip transceiver) | Yes | Yes | Yes | Yes |
| LCD Segments | Up to 488 | Up to 488 | Up to 488 | Up to 488 | Up to 488 |
| 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 |
Key Differentiators
- Dual Partition Flash for live OTA updates with rollback (vs PIC24FJ256GU405-I/M4)
- XLP deep-sleep current below 1 µA for battery-backed HMIs (vs PIC24FJ256GU406-I/PT)
- 48-UQFN 6×6 mm footprint saves PCB area vs 64-pin TQFP (vs PIC24FJ256GL405-I/PT)
Design Notes
Route USB D+ and D- as a 90 Ω differential pair with matched length within 150 mil, keeping them short and isolated from switching nodes. Place the 48-UQFN exposed pad (EP) on a continuous ground pour with at least 9 thermal vias (0.3 mm drill, 0.5 mm pitch) to keep theta_JA low. Decouple VDD with 100 nF ceramic placed within 3 mm of the supply pin and a bulk 10 µF near the ICSP connector for in-circuit programming stability.
The PIC24FJ512GL405-I/M4 supports eXtreme Low-Power (XLP) sleep with deep-sleep current under 1 µA when peripherals are gated off. Estimated: with RTCC running and wake-on-change enabled, average current on a CR2032 (~235 mAh) coin cell is approximately 12 µA, yielding a 2.3-year battery life assuming 200 wakes/day. Verify with Microchip's MPLAB X XLP estimator before finalizing BOM power budget.
Do not confuse the GL4 part number with the GU4 variant: PIC24FJ512GL405 has NO hardware AES/SHA accelerator - selecting GU405 is mandatory for secure-boot or TLS-offload designs. Also note the /M4 suffix denotes 48-UQFN (6×6 mm); the /PT suffix is a 64-pin TQFP and requires PCB layout rework. Always confirm package code against the datasheet pin diagrams before tape-out.
When driving a segmented LCD panel, route COM and SEG traces with 0.2 mm width and 0.2 mm spacing, and add a ground guard trace between adjacent SEG lines for 4-digit or higher displays to suppress crosstalk. Place 1 nF bypass caps on each VLCD pin and verify the bias charge-pump frequency (typically 60 Hz) does not couple into analog inputs - use the on-chip CTMU for cap-touch sensing on dedicated pins only.
Compliance Information
RoHS and REACH compliant per Microchip product page DS7001F. Not AEC-Q100 qualified - this is an industrial-grade MCU (-40 to +85 °C). For automotive applications, select PIC24FJxxxGL5x0-E/M4 extended-grade variants. Lead-free and halogen-free per Microchip environmental compliance statements.
