PIC32MX350F256L-I/PT - 32-bit MCU 256KB Flash TQFP-100 | Microchip
MPN: PIC32MX350F256L-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.32 | $7.32 |
| 10 | $6.65 | $66.50 |
| 100 | $5.91 | $591.00 |
| 500 | $5.32 | $2,660.00 |
| 1,000 | $4.85 | $4,850.00 |
| 3,000 | $4.31 | $12,930.00 |
PIC32MX350F256L-I/PT Overview
What is a PIC32 microcontroller? A PIC32 is a 32-bit RISC microcontroller from Microchip that uses the MIPS instruction set (M4K core in the MX3/4 family). It belongs to the broader category of embedded microcontrollers (MCU), itself a sub-class of microprocessors that integrate Flash, SRAM and peripherals on-chip. Compared with 8-bit PIC16/PIC18 devices, the PIC32 family offers a higher-performance MIPS32 core while retaining the same MPLAB X ecosystem, Harmony configurator, and XC32 toolchain. This positions PIC32MX3/4 between low-cost 8-bit MCUs and Cortex-M3/M4 parts such as STM32 and EFM32.
Key features of the PIC32MX350F256L-I/PT include 256 KB Flash (plus 12 KB auxiliary Flash), 64 KB SRAM, USB 2.0 full-speed On-The-Go, two I2C, two SPI/I2S, five 16-bit timers, a 10-bit 1 Msps ADC with up to 28 channels, two analog comparators, and a CTMU for touch and time measurement. PPS allows flexible peripheral-to-pin mapping, simplifying PCB routing, while PMP enables direct connection to graphical or parallel peripherals. The part operates over -40 C to +105 C and supports industrial temperature grades.
Architecturally the device uses a 5-stage MIPS32 M4K pipeline with hardware multiply/divide, prefetch cache and a separate peripheral bus. The 120 MHz core delivers 150 DMIPS, while on-chip peripherals run from a dedicated 80 MHz peripheral clock, allowing deterministic interrupt response. The integrated USB, PMP and CTMU give the family an HMI-oriented feature set for audio, graphics and capacitive-touch interfaces without external companion ICs.
Typical applications include USB human-interface devices (HIDs), audio interfaces using the I2S modules, low-cost graphical HMI panels driven by PMP and a parallel display or graphics controller, capacitive-touch control panels using CTMU, industrial sensor hubs and motor-control auxiliary logic, and small home appliances combining USB charging with multi-channel ADC sensing.
When designing with this device, allocate the I/O budget carefully - the 100-pin TQFP exposes roughly 76 user I/Os through PPS, but USB, JTAG and oscillator pins consume dedicated pads. Plan capacitor count and trace length to keep VDD/VUSB decoupling within 5 mm of each pin, and budget Flash for both application code and a USB bootloader (typically 16-32 KB) so the 256 KB Flash does not become the bottleneck.
This page synthesizes distributor pricing, same-family drop-in alternatives from the PIC32MX3/4 lineup and the PIC32MX2/1 lower-cost migration path, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC32MX350F256L-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 PIC32MX350F256L-I/PT (same form factor and footprint) — differing in Operating Temperature, USB, Package, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX450F256L-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX370F256L-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX350F256LT-I/PT
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC32MX350F256H-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX340F256L-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX350F256L-I/PT Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K (32-bit RISC) |
| Maximum Core Frequency | 120 MHz (150 DMIPS) |
| Peripheral Bus Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (plus 12 KB auxiliary) |
| Data Memory (SRAM) | 64 KB |
| Supply Voltage Range | 2.3 V to 3.6 V |
| Operating Temperature Range | -40 C to +105 C (industrial, I suffix) |
| Package | 100-pin TQFP (PT), 12 x 12 mm |
| Mounting Type | Surface Mount |
| ADC | 10-bit, up to 28 channels, 1 Msps |
| Analog Comparators | 2 |
| Timers (16-bit) | 5 |
| I2C Modules | 2 |
| SPI / I2S Modules | 2 (SPI with I2S mode) |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| Parallel Master Port (PMP) | Yes (for graphics interfaces) |
| Peripheral Pin Select (PPS) | Yes |
| Charge Time Measurement Unit (CTMU) | Yes (capacitive touch) |
| Power Modes | 5 programmable low-power modes |
| RoHS Status | Compliant |
PIC32MX350F256L-I/PT Pin Configuration
| Pin 1 | RG15 — General I/O / PPS remappable |
| Pin 10 | RF5 — General I/O / PPS remappable |
| Pin 20 | RD0 — General I/O / PMP data |
| Pin 30 | RC13 — General I/O / PMP |
| Pin 40 | RB5 — General I/O / PPS remappable |
| Pin 50 | AN0 — Analog input 0 / ADC |
| Pin 60 | AN10 — Analog input 10 / ADC |
| Pin 70 | VDD — Digital supply 2.3-3.6 V |
| Pin 80 | VSS — Digital ground |
| Pin 90 | OSC1 — Crystal oscillator input |
| Pin 100 | OSC2 — Crystal oscillator output |
Typical Applications
PIC32MX350F256L-I/PT is suitable for 6 applications: USB Human Interface Devices (HID), Audio Interfaces with I2S Codecs, Graphics HMI with Parallel Display, Capacitive Touch Control Panels, Industrial Sensor Hubs and Data Loggers, Home Appliance and Small Motor Auxiliary Control.
USB Human Interface Devices (HID)
The PIC32MX350F256L-I/PT's integrated USB 2.0 full-speed Device/Host/OTG controller is the reason it fits HID designs like keyboards, mice, custom input panels and game controllers. The 256 KB Flash comfortably hosts USB stacks plus a USB bootloader (typically 16-32 KB reserved), leaving room for application code and HID report descriptors. The 120 MHz MIPS32 M4K core sustains 150 DMIPS, which keeps HID polling intervals well below the 1 ms USB full-speed frame budget. The 5 power modes let a wired USB keyboard drop below 500 uA between keystrokes, while PPS lets the designer place the USB D+/D- pins on PCB-friendly pads for clean 90 ohm differential routing and EMI compliance.
Recommended
Audio Interfaces with I2S Codecs
The PIC32MX350F256L-I/PT carries two I2S/SPI modules, making it a strong fit for low-cost digital audio interfaces with external 24-bit codecs such as the SGTL5000, WM8960 or AK4556. The DMA controller can stream audio between the I2S peripheral and a buffer in the 64 KB SRAM without CPU intervention, freeing the 150 DMIPS core for control, mixing and user-interface logic. PPS lets I2S bit-clock and word-select lines be routed to clean PCB pads, keeping the audio path free of cross-talk with switching power traces.
Recommended
Graphics HMI with Parallel Display
The Parallel Master Port (PMP) integrated on the PIC32MX350F256L-I/PT drives small TFT displays with 8- or 16-bit parallel data, perfect for 320x240 to 480x272 graphical HMI panels that need direct CPU control without a separate graphics controller IC. The 120 MHz core and 64 KB SRAM can host frame-buffer slices for menus and gauges; for full-screen framebuffers at QVGA the PIC32MX450F256L-I/PT with 128 KB SRAM is the better fit. PPS allows flexible placement of the PMP data and control signals, simplifying the PCB layout.
Recommended
Capacitive Touch Control Panels
The on-chip Charge Time Measurement Unit (CTMU) enables the PIC32MX350F256L-I/PT to scan matrix capacitive-touch keypads and sliders with sub-percent linearity without an external touch controller. CTMU works by charging a touch electrode through a constant current source and timing the charge to a threshold, so firmware can decode up to 32 keys or a 16-segment slider from a single MCU pin each. The 28-channel 10-bit ADC complements CTMU by providing guard-channel humidity compensation. Industrial-grade -40 C to +105 C operation supports appliances and industrial front panels.
Recommended
Industrial Sensor Hubs and Data Loggers
The PIC32MX350F256L-I/PT's 28-channel 10-bit ADC at 1 Msps, two analog comparators, two I2C, two SPI and five 16-bit timers are well-suited to multi-sensor industrial hubs. The MIPS32 M4K core can poll sensors at deterministic intervals while storing readings in the 64 KB SRAM before offloading via USB or UART. PPS lets the designer put sensor connector pads adjacent to their assigned MCU pins, minimizing analog trace length and noise pickup. The industrial -40 C to +105 C temperature range allows deployment in factory floors.
Recommended
Home Appliance and Small Motor Auxiliary Control
In washing machines, dishwashers and small HVAC appliances the PIC32MX350F256L-I/PT serves as the user-interface and supervisory controller, handling the LCD/keypad via PMP and CTMU touch, while a companion PIC32MX1xx or dsPIC33 drives the actual motor power stage. The 120 MHz core handles user-interface graphics and USB service logging, while the 5 power modes drop standby consumption below 50 uA between user actions. PPS lets the PCB layout place USB, LCD and keypad connectors in ergonomic locations.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX350F256L-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX450F256L-I/PT | PIC32MX370F256L-I/PT | PIC32MX350F256LT-I/PT | PIC32MX350F256H-I/PT | PIC32MX340F256L-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-100 (PT) | TQFP-100 (PT) | TQFP-100 (PT) | TQFP-100 (PT) | TQFP-100 (PT) | TQFP-100 (PT) |
| Core Frequency | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 80 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 128 KB | 32 KB | 64 KB | 64 KB | 32 KB |
| USB OTG | Yes | Yes | Yes | Yes | Yes | Yes |
| PMP / CTMU | Yes | Yes | Yes | Yes | Yes | No CTMU |
Key Differentiators
- Higher core frequency and added CTMU vs PIC32MX340 generation (vs PIC32MX340F256L-I/PT)
- Doubled SRAM for memory-intensive stacks (vs PIC32MX370F256L-I/PT)
- Same 100-pin TQFP footprint with full PPS flexibility (vs PIC32MX350F256H-I/PT)
Design Notes
Estimated: decoupling budget for a 100-pin PIC32MX350F256L-I/PT at 120 MHz core plus 80 MHz peripheral bus. Place one 100 nF X7R 0402 within 5 mm of every VDD pin and a single 4.7 uF X5R bulk capacitor near the package. Add a 100 nF plus 4.7 uF pair on VUSB if USB OTG is used. Use separate analog and digital ground returns tied at a single point under the MCU.
The USB D+/D- differential pair must be routed with 90 ohm differential impedance and length-matched within 150 mil. Place the 48 MHz crystal within 200 mil of OSC1/OSC2 with the load capacitors (typically 18-22 pF for an 8 MHz crystal) right at the MCU pads. JTAG TMS/TCK/TDO/TDI plus Vcap on the Programming/Debugging header should be stub-free and length-matched within 1 inch for reliable MPLAB ICD operation.
Do not forget the Vcap pin on the PIC32MX350F256L-I/PT: it requires an external 10 uF + 100 nF parallel low-ESR capacitor and must never be left floating, or the internal 1.8 V core regulator will not start. Reserve a configuration bits pragma block at the top of main(); defaults reset the watchdog and oscillator to factory values that may not match your crystal. Always link the XC32 startup file for the PIC32MX3/4 family or peripheral headers will not map correctly.
PPS remapping simplifies routing but every remapped digital signal must respect the pin's electrical rating - PPS inputs cannot change trigger edges, and PPS outputs share their pad driver with the underlying GPIO, so a slow peripheral signal cannot be placed on a high-speed pad without verifying the data sheet's per-pin output impedance. When designing with CTMU, route touch electrodes with a guarded copper flood and keep the sense trace length below 50 mm to preserve signal-to-noise ratio.
Compliance Information
RoHS and REACH compliance per Microchip product page; AEC-Q100 not qualified; choose PIC32MX350F256HT-V/PT or other V-suffix variants for automotive.