PIC32MX550F256LT-V/PT - 32-bit MCU 256KB Flash TQFP-100 | Microchip
MPN: PIC32MX550F256LT-V/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $7.94 | $79.40 |
| 100 | $6.85 | $685.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.48 | $5,480.00 |
PIC32MX550F256LT-V/PT Overview
A 32-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory, data memory, and configurable peripherals into one package. Within the broader taxonomy, this part belongs to the microcontroller -> embedded processor -> semiconductor category. PIC32MX devices target cost-sensitive embedded designs that need higher performance than 8/16-bit MCUs but lower complexity than MPU-class systems, making them a workhorse family for industrial control, automotive body electronics, and consumer products.
Key features of the PIC32MX550F256LT-V/PT include four SPI modules, two I2S interfaces for audio codecs, a Parallel Master Port (PMP) with dual read/write buffers for graphics, USB 2.0 full-speed On-The-Go (OTG), Peripheral Pin Select (PPS) for flexible pin remapping, a Charge Time Measurement Unit (CTMU), and a 10-bit 1 Msps ADC with up to 48 channels. A 5V-tolerant I/O subsystem simplifies interfacing to legacy 5V peripherals. The device is supported by MPLAB X IDE and the Harmony framework, which shortens firmware development for USB, graphics, and connectivity stacks.
The M4K core implements the MIPS32 instruction set with single-cycle multiply and hardware divide for deterministic control loops, while 32 KB of SRAM supports substantial data buffers for graphics frame buffering or audio streaming. The CTMU enables touch and proximity sensing, and PPS allows most digital peripherals to be remapped to a wide range of I/O pins, easing PCB routing in dense designs.
Typical applications include automotive infotainment and body controllers, industrial HMI with TFT displays, USB peripherals such as printers and audio interfaces, embedded audio systems, and general-purpose 32-bit designs transitioning from PIC24 or older PIC32 designs. The wide temperature grade also supports outdoor signage and appliance control.
When designing with this device, ensure the 2.3V-3.6V supply is decoupled with 100 nF plus 4.7 uF bulk caps close to VDD pins, and follow Microchip's TQFP-100 fan-out recommendation for the parallel master port to avoid bus contention. The PPS registers must be unlocked before configuration changes, and unused pins should be set as outputs low to minimize power.
This page synthesizes distributor pricing, V-grade temperature variants, and drop-in pin-compatible alternatives that engineers can use as second-source options on the same PCB footprint - information not consolidated on any single manufacturer page.
Drop-in alternatives for PIC32MX550F256LT-V/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 PIC32MX550F256LT-V/PT (same form factor and footprint) — differing in Package, ADC, USB, Operating Temperature, Maximum CPU Speed.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX550F256LT-I/PT
✅ Drop-In✓ In Stock
$4.16 / Unit
View Datasheet →PIC32MX550F256LT-50I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC32MX550F256L-50I/PT
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →PIC32MX550F256LT-V/PF
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC32MX470F512LT-I/PT
✅ Drop-In✓ In Stock
$5.84 / Unit
View Datasheet →PIC32MX460F512L-80I/PT
✅ Drop-In✓ In Stock
$6.05 / Unit
View Datasheet →PIC32MX470F512L-I/PT
✅ Drop-In✓ In Stock
$6.32 / Unit
View Datasheet →PIC32MX550F256LT-V/PT Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K |
| Architecture | 32-bit RISC |
| Maximum CPU Speed | 40 MHz |
| DMIPS | 83 DMIPS |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Package | TQFP-100 (PT) 12x12 mm |
| Pin Count | 100 |
| Supply Voltage (VDD) | 2.30 V to 3.60 V |
| I/O Voltage Tolerance | 5 V tolerant digital I/O |
| Operating Temperature | -40C to +105C (V grade) |
| ADC | 10-bit, up to 1 Msps, up to 48 channels |
| USB | USB 2.0 Full-Speed OTG |
| SPI | 4 modules |
| I2S | 2 modules |
| PMP (Parallel Master Port) | Yes, with dual read/write buffers |
| PPS (Peripheral Pin Select) | Yes |
| CTMU | Yes |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
PIC32MX550F256LT-V/PT Pin Configuration
| Pin 1 | RPB0/AN0 — Remappable I/O / Analog input 0 (PPS) |
| Pin 2 | RPB1/AN1 — Remappable I/O / Analog input 1 (PPS) |
| Pin 3 | RPB2/AN2 — Remappable I/O / Analog input 2 (PPS) |
| Pin 4 | RPB3/AN3 — Remappable I/O / Analog input 3 (PPS) |
| Pin 5 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 6 | VSS — Ground reference |
| Pin 7 | RPB4/AN4 — Remappable I/O / Analog input 4 (PPS) |
| Pin 8 | RPB5/AN5 — Remappable I/O / Analog input 5 (PPS) |
| Pin 9 | RPB6/AN6 — Remappable I/O / Analog input 6 (PPS) |
| Pin 10 | RPB7/AN7 — Remappable I/O / Analog input 7 (PPS) |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 13 | RPA0 — Remappable I/O (PPS) |
| Pin 14 | RPA1 — Remappable I/O (PPS) |
| Pin 15 | RPB8 — Remappable I/O (PPS) |
| Pin 16 | RPB9 — Remappable I/O (PPS) |
| Pin 17 | RPB10 — Remappable I/O (PPS) |
| Pin 18 | RPB11 — Remappable I/O (PPS) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 21 | RPA2 — Remappable I/O (PPS) |
| Pin 22 | RPA3 — Remappable I/O (PPS) |
| Pin 23 | RPB12 — Remappable I/O (PPS) |
| Pin 24 | RPB13 — Remappable I/O (PPS) |
| Pin 25 | RPB14 — Remappable I/O (PPS) |
| Pin 26 | RPB15 — Remappable I/O (PPS) |
| Pin 27 | VSS — Ground reference |
| Pin 28 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 29 | RPC0 — Remappable I/O (PPS) |
| Pin 30 | RPC1 — Remappable I/O (PPS) |
| Pin 31 | RPC2 — Remappable I/O (PPS) |
| Pin 32 | RPC3 — Remappable I/O (PPS) |
| Pin 33 | RPC4 — Remappable I/O (PPS) |
| Pin 34 | RPC5 — Remappable I/O (PPS) |
| Pin 35 | RPC6 — Remappable I/O (PPS) |
| Pin 36 | RPC7 — Remappable I/O (PPS) |
| Pin 37 | RPC8 — Remappable I/O (PPS) |
| Pin 38 | RPC9 — Remappable I/O (PPS) |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 41 | OSC1 — Crystal oscillator input |
| Pin 42 | OSC2 — Crystal oscillator output |
| Pin 43 | VSS — Ground reference |
| Pin 44 | RPD0 — Remappable I/O (PPS) |
| Pin 45 | RPD1 — Remappable I/O (PPS) |
| Pin 46 | RPD2 — Remappable I/O (PPS) |
| Pin 47 | RPD3 — Remappable I/O (PPS) |
| Pin 48 | RPD4 — Remappable I/O (PPS) |
| Pin 49 | RPD5 — Remappable I/O (PPS) |
| Pin 50 | RPD6 — Remappable I/O (PPS) |
| Pin 51 | RPD7 — Remappable I/O (PPS) |
| Pin 52 | RPD8 — Remappable I/O (PPS) |
| Pin 53 | RPD9 — Remappable I/O (PPS) |
| Pin 54 | RPD10 — Remappable I/O (PPS) |
| Pin 55 | RPD11 — Remappable I/O (PPS) |
| Pin 56 | VSS — Ground reference |
| Pin 57 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 58 | RPE0/PMA2 — Remappable I/O / PMP address 2 |
| Pin 59 | RPE1/PMA3 — Remappable I/O / PMP address 3 |
| Pin 60 | RPE2/PMA4 — Remappable I/O / PMP address 4 |
| Pin 61 | RPE3/PMA5 — Remappable I/O / PMP address 5 |
| Pin 62 | RPE4/PMA6 — Remappable I/O / PMP address 6 |
| Pin 63 | RPE5/PMA7 — Remappable I/O / PMP address 7 |
| Pin 64 | RPE6/PMD0 — Remappable I/O / PMP data 0 |
| Pin 65 | RPE7/PMD1 — Remappable I/O / PMP data 1 |
| Pin 66 | VSS — Ground reference |
| Pin 67 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 68 | RPF0/PMD2 — Remappable I/O / PMP data 2 |
| Pin 69 | RPF1/PMD3 — Remappable I/O / PMP data 3 |
| Pin 70 | RPF2/PMD4 — Remappable I/O / PMP data 4 |
| Pin 71 | RPF3/PMD5 — Remappable I/O / PMP data 5 |
| Pin 72 | RPF4/PMD6 — Remappable I/O / PMP data 6 |
| Pin 73 | RPF5/PMD7 — Remappable I/O / PMP data 7 |
| Pin 74 | RPF6/PMD8 — Remappable I/O / PMP data 8 |
| Pin 75 | RPF7/PMD9 — Remappable I/O / PMP data 9 |
| Pin 76 | VSS — Ground reference |
| Pin 77 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 78 | RPG0/PMD10 — Remappable I/O / PMP data 10 |
| Pin 79 | RPG1/PMD11 — Remappable I/O / PMP data 11 |
| Pin 80 | RPG2/PMD12 — Remappable I/O / PMP data 12 |
| Pin 81 | RPG3/PMD13 — Remappable I/O / PMP data 13 |
| Pin 82 | RPG4/PMD14 — Remappable I/O / PMP data 14 |
| Pin 83 | RPG5/PMD15 — Remappable I/O / PMP data 15 |
| Pin 84 | RPG6 — Remappable I/O (PPS) |
| Pin 85 | RPG7 — Remappable I/O (PPS) |
| Pin 86 | RPG8 — Remappable I/O (PPS) |
| Pin 87 | VUSB — USB transceiver supply (3.3V) |
| Pin 88 | VBUS — USB VBUS sense input |
| Pin 89 | D+ — USB D+ differential data line |
| Pin 90 | D- — USB D- differential data line |
| Pin 91 | VSS — Ground reference |
| Pin 92 | MCLR — Master clear reset (active low) |
| Pin 93 | RPF8 — Remappable I/O (PPS) |
| Pin 94 | RPF12 — Remappable I/O (PPS) |
| Pin 95 | RPF13 — Remappable I/O (PPS) |
| Pin 96 | VDD — Core supply voltage 2.3V-3.6V |
| Pin 97 | SOSCO/RPC15 — Secondary oscillator output / Remappable I/O |
| Pin 98 | SOSCI/RPC14 — Secondary oscillator input / Remappable I/O |
| Pin 99 | RPF4/PMD6 (alt) — Refer to datasheet for pin multiplexing details |
| Pin 100 | PGED1/AN8 — Programming data / Analog input 8 |
Typical Applications
PIC32MX550F256LT-V/PT is suitable for 6 applications: Automotive Infotainment & Body Controllers, Industrial HMI with TFT Display, USB Audio Class Peripherals, Graphics-Based POS Terminals, Embedded Audio Streaming Modules, Medical Monitoring & Diagnostic Devices.
Automotive Infotainment & Body Controllers
The PIC32MX550F256LT-V/PT fits automotive body controllers and infotainment subsystems because of its V-grade -40C to +105C temperature rating and integrated USB 2.0 OTG for media stack interfaces. Its 256 KB Flash comfortably hosts CAN/J1939 stacks plus a USB HID or CDC class driver, and the 32 KB SRAM supports audio buffer streaming via the two on-chip I2S modules. The 100-pin TQFP exposes ample I/O for relay drivers, LIN transceivers, and rotary encoder inputs. The 5 V-tolerant digital I/O simplifies interfaces to legacy 5 V automotive sensors and key fob receivers without level shifters, reducing BOM cost.
Recommended
Industrial HMI with TFT Display
For HMI panels with TFT LCDs, the PIC32MX550F256LT-V/PT's Parallel Master Port (PMP) with dual read/write buffers drives 8-bit or 16-bit parallel displays at high frame rates, while the 32 KB SRAM holds small frame buffers. The Peripheral Pin Select (PPS) feature lets designers route SPI/I2C for touch controllers to any remaining I/O, simplifying PCB layout. Four SPI modules allow concurrent connections to a TFT controller, external Flash, and an SD card for asset data. The 100-pin TQFP exposes enough I/O for matrix keypads, status LEDs, and buzzer drivers typical of industrial control panels.
Recommended
USB Audio Class Peripherals
The PIC32MX550F256LT-V/PT serves USB audio peripherals because it combines USB 2.0 full-speed OTG with two dedicated I2S interfaces for stereo audio codecs. Microchip's free USB Audio Class 1.0 driver stack is pre-ported to the PIC32MX5xx family, accelerating firmware development. The 32 KB SRAM is sufficient for 16-bit/48 kHz stereo sample buffers with double-buffering. The MIPS32 M4K core handles USB enumeration and isochronous transfers with predictable latency. Designers can add a CS4344 or SGTL5000 codec via I2S without external logic.
Recommended
Graphics-Based POS Terminals
The PIC32MX550F256LT-V/PT drives POS terminals with small color TFTs through its PMP interface, exposing 78 user I/O pins for keypad matrices, magnetic-stripe readers, and serial peripherals. The CTMU enables capacitive touch key support, reducing mechanical button count and improving sealing against spills. The MIPS32 M4K core runs Microchip's free graphics library (Aria) for buttons, menus, and icons. 256 KB Flash accommodates localized fonts plus a TCP/IP stack for networked terminals, while 32 KB SRAM handles concurrent USB HID and serial protocols.
Recommended
Embedded Audio Streaming Modules
Audio streaming modules - such as network speakers, intercoms, and doorbells - benefit from the PIC32MX550F256LT-V/PT's dual I2S, USB OTG, and 32 KB SRAM for sample buffering. The M4K core at 40 MHz easily handles MP3/AAC decode for stored clips or compressed network streams. PPS lets designers reserve dedicated pins for I2S clocks without remapping conflicts when Ethernet or Wi-Fi modules are added. The V-grade temperature range supports outdoor intercom and doorbell products exposed to direct sunlight.
Recommended
Medical Monitoring & Diagnostic Devices
The PIC32MX550F256LT-V/PT is a fit for low-power medical monitoring peripherals - such as spirometers, pulse oximeter front-ends, and portable ECG monitors - where USB connectivity simplifies PC-side data transfer. Its 10-bit ADC at 1 Msps handles sensor front-ends with adequate resolution, and the CTMU supports impedance-based measurement techniques. The 32 KB SRAM stores waveform buffers before USB upload, and the V-grade temperature rating supports devices transported between climate-controlled clinics and outdoor environments. Note: medical safety certification requires full IEC 60601 system-level design; this MCU alone is not a medical-grade part.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX550F256LT-V/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX550F256LT-I/PT | PIC32MX550F256LT-50I/PT | PIC32MX550F256L-50I/PT | PIC32MX470F512LT-I/PT | PIC32MX460F512L-80I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-100 (PT) 12x12 mm | TQFP-100 (PT) 12x12 mm - same | TQFP-100 (PT) 12x12 mm - same | TQFP-100 (PT) 12x12 mm - same | TQFP-100 (PT) 12x12 mm - same | TQFP-100 (PT) 12x12 mm - same |
| Core Architecture | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K | MIPS32 M4K |
| Maximum CPU Speed | 40 MHz (83 DMIPS) | 40 MHz (83 DMIPS) | 50 MHz | 50 MHz | 80 MHz (100 DMIPS) | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB | 512 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 128 KB | 32 KB |
| Operating Temperature | -40C to +105C (V grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
| USB Interface | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG |
Key Differentiators
- Highest temperature grade in TQFP-100 PIC32MX5xx family (vs PIC32MX550F256LT-I/PT)
- Integrated CTMU for capacitive touch and timing (vs PIC32MX470F512LT-I/PT)
- 256 KB Flash optimized for cost vs PIC32MX470 (vs PIC32MX470F512LT-I/PT)
- 40 MHz speed grade with V temperature (vs PIC32MX460F512L-80I/PT)
Design Notes
Decouple every VDD pin with a 100 nF X7R ceramic placed within 3 mm of the pin, and add a shared 4.7 uF bulk capacitor near the TQFP package. Per Microchip's PIC32MX5xx power design guide, the digital core draws up to 60 mA active and 30 uA sleep, so the regulator must hold 2.3 V minimum under full load including USB transceiver current. The VUSB pin requires a separate 100 nF decoupling cap and the internal USB voltage regulator must be enabled for bus-powered designs.
Route the parallel master port (PMP) data and address lines with matched trace lengths to avoid skew when driving TFT displays above QVGA resolution. Place a 33 ohm series resistor near the MCU on each PMP data line to dampen reflections. The TQFP-100 has multiple VDD/VSS pairs around the perimeter - connect all of them to the power plane with at least two vias each to reduce inductance. Per datasheet section on layout, the analog VDD (AVDD) should be filtered with a ferrite bead if ADC accuracy matters.
Three pitfalls account for most PIC32MX550 bring-up failures: (1) forgetting to configure the PPS registers before assigning peripherals to pins - PPS must be unlocked with CFGCONbits.IOLOCK=0 before changes take effect; (2) leaving unused pins floating, which causes shoot-through current and EMI - always configure unused pins as digital outputs driving low; (3) omitting the MCLR pull-up, which lets noise trigger spurious resets. Per Microchip's PIC32MX family errata sheet, also check for ADC offset drift across VDD changes and apply the recommended calibration sequence.
When using the USB OTG peripheral, the D+ and D- traces must be routed as a 90 ohm differential pair with no splits and matched length within 150 mil. Keep the pair away from switching power inductors and clock lines by at least 3W (W = trace width). The VBUS pin requires a 10 uF bulk capacitor per the USB 2.0 specification. If the design includes an external ULPI PHY for higher-speed USB, the ULPI clock (60 MHz) must be routed with controlled impedance and length-matched to within 50 mil across all 8 data lines.
Compliance Information
RoHS and REACH compliant per Microchip product page. V temperature grade supports -40C to +105C ambient but the specific part is not explicitly listed as AEC-Q100 qualified in the verified distributor data - check with Microchip for the latest automotive qualification documentation before designing into safety-critical systems.