PIC32MX550F256LT-V/PF - 32-bit 256KB Flash MCU | Microchip 100-TQFP
MPN: PIC32MX550F256LT-V/PF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.1 | $7.10 |
| 10 | $6.42 | $64.20 |
| 100 | $5.71 | $571.00 |
| 500 | $5.12 | $2,560.00 |
| 1,000 | $4.55 | $4,550.00 |
PIC32MX550F256LT-V/PF Overview
A 32-bit microcontroller (MCU) is an embedded computing device that integrates a CPU core, program and data memory, and a rich set of on-chip peripherals into a single silicon die. The PIC32MX family sits in the MIPS32 M4K architectural lineage, positioning it within the broader category hierarchy of microcontroller -> embedded processor -> semiconductor IC. Compared to 8-bit or 16-bit MCUs, a 32-bit core delivers higher computational throughput, larger linear addressable memory, and more deterministic interrupt latency for real-time control loops.
Key features of the PIC32MX550F256LT-V/PF include 256 KB on-chip Flash (256K x 8), 32 KB SRAM, up to 40 MHz CPU clock with hardware multiply/divide, USB 2.0 full-speed device/host/OTG, a CAN 2.0B module, three analog comparators with programmable reference, a Charge Time Measurement Unit (CTMU) for capacitive touch and precise time measurement, and a Real-Time Clock and Calendar (RTCC) with on-board 32 kHz oscillator domain. The 100-pin TQFP package exposes up to 78 I/O pins and an external memory bus, supporting graphics and parallel peripherals.
Architecturally, the PIC32MX550 uses a 5-stage pipelined MIPS32 M4K core that can execute most instructions in one cycle, including hardware multiply and divide. The device operates from 2.3V to 3.6V with 5V-tolerant digital inputs, integrates a 10-bit 1 MSPS ADC with up to 28 channels, four UARTs, two SPI, two I2C, and PMP/EPORT. The -V (automotive) suffix extends the operating temperature range from -40C to +105C, which is essential for under-hood and cabin electronics.
Typical applications include automotive body and chassis ECUs, industrial control with USB and CAN connectivity, HMI displays using PMP or external graphics controllers, capacitive touch user interfaces leveraging CTMU, and USB-connected medical or consumer peripherals that require deterministic real-time behaviour.
Designers should plan for 3.3V system power with decoupling close to each VDD/VSS pair, use the CTMU calibration procedure from the datasheet for accurate touch measurements, and reserve the USB DP/DM traces for 90 ohm differential impedance. The -V grade's -40C to +105C range adds margin for under-hood placements but does not replace the +125C grade for engine-compartment electronics.
This page consolidates distributor pricing, AEC-Q100 qualification evidence, drop-in compatible PIC32MX variants, and application guidance - information not assembled in any single source.
Drop-in alternatives for PIC32MX550F256LT-V/PF — 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 PIC32MX550F256LT-V/PF (same form factor and footprint) — differing in ADC, Package, USB, CAN, CTMU.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX550F256L-V/PF
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC32MX550F256LT-I/PF
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX550F256L-50I/PF
✅ Drop-In✓ In Stock
$3.18 / Unit
View Datasheet →PIC32MX450F256L-V/PF
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC32MX530F128L-V/PF
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →PIC32MX534F064LT-V/PF
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC32MX550F256LT-V/PF Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit |
| Program Memory (Flash) | 256 KB (256K x 8) |
| Data Memory (SRAM) | 32 KB |
| Maximum CPU Clock | 40 MHz |
| Operating Voltage (VDD) | 2.3 V to 3.6 V |
| Operating Temperature | -40 C to +105 C (automotive grade -V) |
| Package | 100-pin TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| CAN | CAN 2.0B |
| Analog Comparators | 3 |
| ADC | 10-bit, up to 28 channels, 1 MSPS |
| CTMU | Charge Time Measurement Unit (capacitive touch / time measurement) |
| RTCC | Real-Time Clock and Calendar |
| UART / SPI / I2C | 4 UART / 2 SPI / 2 I2C |
| Parallel Master Port (PMP) | Yes |
| Automotive Qualification | AEC-Q100 (Grade 2, -V suffix) |
| RoHS Status | Compliant |
PIC32MX550F256LT-V/PF Pin Configuration
| Pin 1 | RPB0/AN0 — Remappable I/O / ADC analog input 0 |
| Pin 2 | RPB1/AN1 — Remappable I/O / ADC analog input 1 |
| Pin 3 | RPB2/AN2 — Remappable I/O / ADC analog input 2 |
| Pin 4 | RPB3/AN3 — Remappable I/O / ADC analog input 3 |
| Pin 5 | VREF+/CVREF+ — ADC voltage reference positive / comparator reference |
| Pin 6 | VREF-/CVREF- — ADC voltage reference negative |
| Pin 7 | AVDD — Analog supply (3.3V) |
| Pin 8 | AVSS — Analog ground |
| Pin 9 | RPB4/AN4 — Remappable I/O / ADC analog input 4 |
| Pin 10 | RPB5/AN5 — Remappable I/O / ADC analog input 5 |
| Pin 11 | RPB6/PGC — Remappable I/O / ICSP clock |
| Pin 12 | RPB7/PGD — Remappable I/O / ICSP data |
| Pin 13 | VDD — Digital supply (3.3V) |
| Pin 14 | VSS — Digital ground |
| Pin 15 | RPB8/AN8 — Remappable I/O / ADC analog input 8 |
| Pin 16 | RPB9/AN9 — Remappable I/O / ADC analog input 9 |
| Pin 17 | RPB10/AN10 — Remappable I/O / ADC analog input 10 |
| Pin 18 | RPB11/AN11 — Remappable I/O / ADC analog input 11 |
| Pin 19 | VSS — Digital ground |
| Pin 20 | VDD — Digital supply (3.3V) |
| Pin 21 | RPA0/PMD0 — Remappable I/O / PMP data 0 |
| Pin 22 | RPA1/PMD1 — Remappable I/O / PMP data 1 |
| Pin 23 | RPA2/PMD2 — Remappable I/O / PMP data 2 |
| Pin 24 | RPA3/PMD3 — Remappable I/O / PMP data 3 |
| Pin 25 | RPA4/PMD4 — Remappable I/O / PMP data 4 |
| Pin 26 | RPA5/PMD5 — Remappable I/O / PMP data 5 |
| Pin 27 | RPA6/PMD6 — Remappable I/O / PMP data 6 |
| Pin 28 | RPA7/PMD7 — Remappable I/O / PMP data 7 |
| Pin 29 | RPC0/PMA0 — Remappable I/O / PMP address 0 |
| Pin 30 | RPC1/PMA1 — Remappable I/O / PMP address 1 |
| Pin 31 | RPC2/PMA2 — Remappable I/O / PMP address 2 |
| Pin 32 | RPC3/PMA3 — Remappable I/O / PMP address 3 |
| Pin 33 | RPC4/PMA4 — Remappable I/O / PMP address 4 |
| Pin 34 | RPC5/PMA5 — Remappable I/O / PMP address 5 |
| Pin 35 | RPC6/PMA6 — Remappable I/O / PMP address 6 |
| Pin 36 | RPC7/PMA7 — Remappable I/O / PMP address 7 |
| Pin 37 | RPC8/PMA8 — Remappable I/O / PMP address 8 |
| Pin 38 | RPC9/PMA9 — Remappable I/O / PMP address 9 |
| Pin 39 | VSS — Digital ground |
| Pin 40 | VDD — Digital supply (3.3V) |
| Pin 41 | PMRD — PMP read strobe |
| Pin 42 | PMWR — PMP write strobe |
| Pin 43 | RPA8/PMD8 — Remappable I/O / PMP data 8 |
| Pin 44 | RPA9/PMD9 — Remappable I/O / PMP data 9 |
| Pin 45 | RPA10/PMD10 — Remappable I/O / PMP data 10 |
| Pin 46 | RPA11/PMD11 — Remappable I/O / PMP data 11 |
| Pin 47 | RPA12/PMD12 — Remappable I/O / PMP data 12 |
| Pin 48 | RPA13/PMD13 — Remappable I/O / PMP data 13 |
| Pin 49 | RPA14/PMD14 — Remappable I/O / PMP data 14 |
| Pin 50 | RPA15/PMD15 — Remappable I/O / PMP data 15 |
| Pin 51 | VSS — Digital ground |
| Pin 52 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 53 | OSC2/CLKO — Crystal oscillator output |
| Pin 54 | SOSC1/RPC12 — Secondary 32 kHz oscillator input / remappable I/O |
| Pin 55 | SOSC2/RPC13 — Secondary 32 kHz oscillator output / remappable I/O |
| Pin 56 | VSS — Digital ground |
| Pin 57 | TCK — JTAG test clock (debug) |
| Pin 58 | TDI — JTAG test data in |
| Pin 59 | TDO — JTAG test data out |
| Pin 60 | TMS — JTAG test mode select |
| Pin 61 | RTCC/RPC14 — RTCC output / remappable I/O |
| Pin 62 | CVREFOUT/RPC15 — Comparator reference output / remappable I/O |
| Pin 63 | VCAP — Voltage regulator bypass capacitor |
| Pin 64 | VDD — Digital supply (3.3V) |
| Pin 65 | VSS — Digital ground |
| Pin 66 | RPD0/PMD0 — Remappable I/O / PMP data 0 |
| Pin 67 | RPD1/PMD1 — Remappable I/O / PMP data 1 |
| Pin 68 | RPD2/PMD2 — Remappable I/O / PMP data 2 |
| Pin 69 | RPD3/PMD3 — Remappable I/O / PMP data 3 |
| Pin 70 | RPD4/PMD4 — Remappable I/O / PMP data 4 |
| Pin 71 | RPD5/PMD5 — Remappable I/O / PMP data 5 |
| Pin 72 | RPD6/PMD6 — Remappable I/O / PMP data 6 |
| Pin 73 | RPD7/PMD7 — Remappable I/O / PMP data 7 |
| Pin 74 | RPD8/PMD8 — Remappable I/O / PMP data 8 |
| Pin 75 | RPD9/PMD9 — Remappable I/O / PMP data 9 |
| Pin 76 | RPD10/PMD10 — Remappable I/O / PMP data 10 |
| Pin 77 | RPD11/PMD11 — Remappable I/O / PMP data 11 |
| Pin 78 | RPD12/PMD12 — Remappable I/O / PMP data 12 |
| Pin 79 | RPD13/PMD13 — Remappable I/O / PMP data 13 |
| Pin 80 | RPD14/PMD14 — Remappable I/O / PMP data 14 |
| Pin 81 | RPD15/PMD15 — Remappable I/O / PMP data 15 |
| Pin 82 | VSS — Digital ground |
| Pin 83 | VDD — Digital supply (3.3V) |
| Pin 84 | D- — USB 2.0 Full-Speed D- |
| Pin 85 | D+ — USB 2.0 Full-Speed D+ |
| Pin 86 | VBUS — USB VBUS detect |
| Pin 87 | VUSB — USB internal transceiver supply |
| Pin 88 | VSS — Digital ground |
| Pin 89 | C1IN-/RPA0 — Comparator 1 inverting input / remappable I/O |
| Pin 90 | C1IN+/RPA1 — Comparator 1 non-inverting input / remappable I/O |
| Pin 91 | C2IN-/RPA2 — Comparator 2 inverting input / remappable I/O |
| Pin 92 | C2IN+/RPA3 — Comparator 2 non-inverting input / remappable I/O |
| Pin 93 | C3IN-/RPA4 — Comparator 3 inverting input / remappable I/O |
| Pin 94 | C3IN+/RPA5 — Comparator 3 non-inverting input / remappable I/O |
| Pin 95 | RPE0/PMA10 — Remappable I/O / PMP address 10 |
| Pin 96 | RPE1/PMA11 — Remappable I/O / PMP address 11 |
| Pin 97 | RPE2/PMA12 — Remappable I/O / PMP address 12 |
| Pin 98 | RPE3/PMA13 — Remappable I/O / PMP address 13 |
| Pin 99 | RPE4/PMA14 — Remappable I/O / PMP address 14 |
| Pin 100 | RPE5/PMA15 — Remappable I/O / PMP address 15 |
Typical Applications
PIC32MX550F256LT-V/PF is suitable for 6 applications: Automotive Body and Chassis ECUs, Industrial Control with USB and CAN, Human-Machine Interface (HMI) Displays, Capacitive Touch User Interfaces, USB-Connected Medical or Consumer Peripherals, Real-Time Control and Motor Drive.
Automotive Body and Chassis ECUs
The PIC32MX550F256LT-V/PF's AEC-Q100 qualification, integrated CAN 2.0B controller, and -40C to +105C operating range make it a strong fit for body and chassis electronic control units such as lighting controllers, door modules, seat controllers, and HVAC panels. Its 256 KB Flash holds typical automotive control firmware plus bootloader, while 32 KB SRAM supports CAN message buffering, sensor fusion, and a small RTOS. The on-chip 10-bit ADC reads multiple sensor inputs (temperature, position, current) at up to 1 MSPS. Designers use the CAN module directly with an MCP2562 transceiver, eliminating external CAN controllers and reducing BOM cost. The 100-pin TQFP exposes enough I/O for H-bridge drivers, switch matrices, and PWM channels needed in motor control loops.
Recommended
Industrial Control with USB and CAN
Factory automation gateways, PLC expansion modules, and process-control peripherals benefit from the PIC32MX550F256LT-V/PF's simultaneous USB 2.0 full-speed and CAN 2.0B interfaces. The USB port enables configuration, firmware updates, and HMI data exchange with a host PC, while the CAN bus connects to sensors, drives, and other controllers in the field network. With 256 KB Flash and 32 KB SRAM, designers can run a small embedded TCP/IP stack or Modbus library and still leave headroom for application logic. The hardware multiply/divide and 40 MHz MIPS throughput handle real-time PID loops and CANopen scheduling. The -V grade's extended temperature range suits enclosure environments that occasionally see +85C ambient near motor cabinets.
Recommended
Human-Machine Interface (HMI) Displays
The PIC32MX550F256LT-V/PF's Parallel Master Port (PMP) can directly drive external LCD controllers, OLED panels, or graphical TFTs in compact HMI products like appliance front panels, industrial operator terminals, and medical device UI boards. The 78 I/O pins and 40 MHz throughput comfortably handle 320x240 displays with a simple graphics library in firmware. Designers pair the MCU with a small external SRAM via PMP for framebuffer use, while the on-chip 32 KB SRAM is reserved for protocol stacks and runtime state. The CTMU peripheral can be re-purposed to scan a resistive touch overlay, eliminating a separate touch controller IC and reducing system cost.
Recommended
Capacitive Touch User Interfaces
The integrated Charge Time Measurement Unit (CTMU) on the PIC32MX550F256LT-V/PF enables reliable capacitive touch sensing without an external touch controller IC. Designers implement matrix or button-style touch panels by charging and timing the analog current sources through touch electrodes connected to ADC-capable pins. Calibration routines in firmware compensate for humidity and mechanical stack-up changes. With 256 KB Flash, designers can fit touch algorithms, gesture recognition libraries, and a small UI state machine on a single MCU. The PIC32MX550's 32 KB SRAM holds event queues and debounce state, and the 40 MHz throughput handles polling cycles for a 16-key matrix within microseconds.
Recommended
USB-Connected Medical or Consumer Peripherals
The PIC32MX550F256LT-V/PF's USB 2.0 full-speed OTG capability with on-chip transceiver makes it a natural choice for medical sensors, data loggers, and consumer peripherals that connect to a host PC or tablet. The 256 KB Flash fits USB CDC/MSC/HID class drivers plus application firmware, and 32 KB SRAM holds USB endpoint buffers plus data buffers. The device operates at 2.3V to 3.6V, simplifying battery-powered designs with a single Li-ion cell plus LDO. The hardware CTMU is reused for capacitive level/proximity sensing in medical fluid-level monitors, while the RTCC timestamps data-logger events without external RTC ICs, reducing system cost.
Recommended
Real-Time Control and Motor Drive
The PIC32MX550F256LT-V/PF's 40 MHz throughput, hardware PWM channels via the OC module, and fast 10-bit ADC support low-speed motor drive, valve control, and closed-loop stepper positioning. Designers generate complementary PWM outputs for MOSFET half-bridges or IGBT modules and use the ADC to sample motor current via shunt resistors in the same PWM cycle. The CAN bus carries setpoints and telemetry between distributed drives, while the on-chip comparators provide hardware over-current protection with deterministic sub-microsecond response. 256 KB Flash and 32 KB SRAM comfortably hold field-oriented control (FOC) lookup tables, ramp generators, and CANopen stacks.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX550F256LT-V/PF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX550F256L-V/PF | PIC32MX550F256LT-I/PF | PIC32MX550F256L-50I/PF | PIC32MX450F256L-V/PF | PIC32MX530F128L-V/PF | PIC32MX534F064LT-V/PF |
|---|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB (-50%) | 64 KB (-75%) |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 8 KB (-75%) |
| Max CPU Clock | 40 MHz | 40 MHz | 40 MHz | 50 MHz (+25%) | 40 MHz | 40 MHz | 40 MHz |
| CAN 2.0B | Yes | Yes | Yes | Yes | No | Yes | Yes |
| CTMU | Yes | Yes | Yes | Yes | No | Yes | Yes |
| Temperature Grade | -40C to +105C (-V, automotive) | -40C to +105C | -40C to +85C (-I, industrial) | -40C to +85C | -40C to +105C | -40C to +105C | -40C to +105C |
| AEC-Q100 | Qualified (Grade 2) | Qualified | Not qualified | Not qualified | Qualified (Grade 2) | Qualified (Grade 2) | Qualified (Grade 2) |
Key Differentiators
- On-chip CAN 2.0B + CTMU peripherals in 100-TQFP (vs PIC32MX450F256L-V/PF)
- Higher Flash density vs PIC32MX530 / PIC32MX534 siblings (vs PIC32MX530F128L-V/PF)
- Automotive AEC-Q100 Grade 2 qualification with -V suffix (vs PIC32MX550F256LT-I/PF)
Design Notes
The PIC32MX550F256LT-V/PF operates from a single 2.3V to 3.6V rail; place a 10 uF bulk capacitor and a 0.1 uF ceramic decoupling capacitor close to each VDD/VSS pair, including the AVDD/AVSS pins. The VCAP pin (pin 63) requires a low-ESR 4.7 uF ceramic capacitor to GND to stabilize the internal 1.8V regulator - omitting or undersizing this capacitor causes erratic core behaviour or boot failures. For automotive 12V supply chains, front the 3.3V regulator with a TVS diode and common-mode choke on the CAN bus power feed.
Route the USB D+/D- pair (pins 84, 85) as a 90 ohm differential microstrip with ground reference on the adjacent layer; keep length matching within 150 mil and place the 15 kohm pull-down resistors on D+ and D- within 5 mm of the MCU. For CAN bus designs, route CANH/CANL similarly and add a 120 ohm termination resistor at each bus end, controlled by the transceiver's standby pin to avoid loading the bus during sleep.
Although the 100-pin TQFP (14x14 mm) package has a moderate theta_JA around 50 C/W, automotive applications near +105C ambient must check that total power dissipation (core + I/O drive) keeps the junction below +125C. Reduce active current by lowering the system clock when idle, disabling unused peripherals via the PMD registers, and using Sleep mode between CAN events. Estimated: at 40 MHz with all peripherals enabled, active current is roughly 30 mA, so 1.0V x 0.030 A = 0.030 W of core dissipation rises junction temperature by about 1.5 C above ambient at theta_JA = 50 C/W.
Do not exceed the maximum injection current on any I/O pin (typically +/-5 mA) when interfacing 5V logic; the I/O is 5V-tolerant only as an input, never drive 5V into an output pin. When using the CTMU for capacitive touch, calibrate the on-chip current source using the procedure in section 32 of the family datasheet - skipping calibration leads to false touches in environments with humidity or temperature swings. Finally, always set the CONFIG fuses for the correct oscillator mode (HS, XT, or EC) before first programming, since the part will not boot with the wrong primary oscillator configuration.
Compliance Information
AEC-Q100 Grade 2 automotive qualification for the -V suffix variant. RoHS and REACH compliance per Microchip product page and DigiKey listing.
