PIC32MX320F128LT-80I/PT - 80MHz 32-bit MCU 128KB Flash | Microchip
MPN: PIC32MX320F128LT-80I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.68 | $66.80 |
| 100 | $5.94 | $594.00 |
| 500 | $5.32 | $2,660.00 |
| 1,000 | $4.78 | $4,780.00 |
PIC32MX320F128LT-80I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable I/O peripherals. The PIC32MX320 family occupies the entry point of Microchip's 32-bit MIPS-based portfolio, sitting architecturally between 8-bit PIC16/PIC18 MCUs and higher-end Cortex-M devices. The MIPS32 M4K core delivers 1.56 DMIPS/MHz performance with single-cycle multiplication and hardware multiply-accumulate support, enabling deterministic real-time control.
Key features include 128 KB Flash, 32 KB SRAM, up to 85 general-purpose I/O pins, five 16-bit timers/counters, two I2C and two SPI modules, two UART modules with IrDA support, a parallel master port (PMP), a 16-channel 10-bit ADC at up to 500 ksps, and a real-time clock/calendar with calendar mode. The ICSP debug interface is supported via PGECx/PGEDx pins, enabling in-circuit programming and debugging with MPLAB tools.
The PIC32MX320F128LT-80I/PT operates from 2.3V to 3.6V and includes a 5V tolerant digital I/O structure. Internal DMA eliminates CPU overhead for data movement, while hardware CRC and PMP accelerate memory-mapped peripheral interfacing. The 100-pin TQFP package exposes nearly the full peripheral set simultaneously, ideal for graphics, USB-device (via on-chip transceiver-less interface), or industrial control hubs.
Typical applications include industrial automation controllers, HVAC control boards, point-of-sale terminals, medical instrumentation, multi-axis motor control pre-processors, low-power HMI displays, and consumer appliances requiring 32-bit performance with 8-bit-style simplicity. The PMP makes it a cost-effective graphics controller for STN/TFT displays in HMI panels.
When designing with this part, allocate decoupling capacitance (100 nF + 10 uF bulk) near each VDD/VDD/VSS pin pair and follow Microchip's recommended analog/digital ground split for ADC accuracy. The 80 MHz operation typically demands a 4-layer PCB for signal integrity on the external memory bus, if used.
This page synthesizes distributor pricing, drop-in PIC32MX3XX/4XX family alternatives, and design notes that complement the Microchip datasheet without repeating it verbatim.
Drop-in alternatives for PIC32MX320F128LT-80I/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 PIC32MX320F128LT-80I/PT (same form factor and footprint) — differing in Package, Timers, ADC, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F128L-80I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F128LT-80V/PT
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →PIC32MX360F512L-80I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F128L-80I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX230F128L-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX270F512L-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F128LT-80I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Speed | 80 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| Data Memory (SRAM) | 32 KB |
| Number of I/O Pins | 85 |
| Package | 100-pin TQFP (12x12 mm) |
| Operating Voltage Range | 2.3 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial) |
| ADC | 10-bit, up to 16 channels, 500 ksps |
| Timers | Five 16-bit timers/counters |
| UART Modules | 2 (with IrDA support) |
| SPI Modules | 2 |
| I2C Modules | 2 |
| Parallel Master Port (PMP) | Yes |
| DMA Channels | Yes (integrated DMA controller) |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel ("T" suffix) |
| RoHS Status | Compliant |
PIC32MX320F128LT-80I/PT Pin Configuration
| Pin 1 | RG15 — General purpose I/O |
| Pin 2 | VDD — Supply voltage |
| Pin 3 | RB5/PMD5 — I/O / PMP data line 5 |
| Pin 4 | RB4/PMD4 — I/O / PMP data line 4 |
| Pin 5 | RB3/PMD3 — I/O / PMP data line 3 |
| Pin 6 | RB2/PMD2 — I/O / PMP data line 2 |
| Pin 7 | RB1/PMD1 — I/O / PMP data line 1 |
| Pin 8 | RB0/PMD0 — I/O / PMP data line 0 |
| Pin 9 | RB6/PGEC2 — I/O / Programming clock 2 |
| Pin 10 | RB7/PGED2 — I/O / Programming data 2 |
| Pin 11 | VSS — Ground |
| Pin 12 | RA14 — General purpose I/O |
| Pin 13 | RA15 — General purpose I/O |
| Pin 14 | VDD — Supply voltage |
| Pin 15 | RF0 — General purpose I/O |
| Pin 16 | RF1 — General purpose I/O |
| Pin 17 | RG6 — General purpose I/O |
| Pin 18 | RG7 — General purpose I/O |
| Pin 19 | RG8 — General purpose I/O |
| Pin 20 | RG9 — General purpose I/O |
| Pin 21 | VSS — Ground |
| Pin 22 | RA0 — General purpose I/O |
| Pin 23 | RA1 — General purpose I/O |
| Pin 24 | RA2 — General purpose I/O |
| Pin 25 | RA3 — General purpose I/O |
| Pin 26 | RA4 — General purpose I/O |
| Pin 27 | RA5 — General purpose I/O |
| Pin 28 | RD14 — General purpose I/O |
| Pin 29 | RD15 — General purpose I/O |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Supply voltage |
| Pin 32 | RC1 — General purpose I/O |
| Pin 33 | RC2 — General purpose I/O |
| Pin 34 | RC3 — General purpose I/O |
| Pin 35 | RC4 — General purpose I/O |
| Pin 36 | VDD — Supply voltage |
| Pin 37 | RD0 — General purpose I/O |
| Pin 38 | RD1 — General purpose I/O |
| Pin 39 | RD2 — General purpose I/O |
| Pin 40 | RD3 — General purpose I/O |
| Pin 41 | RD4 — General purpose I/O |
| Pin 42 | RD5 — General purpose I/O |
| Pin 43 | RD6 — General purpose I/O |
| Pin 44 | RD7 — General purpose I/O |
| Pin 45 | VSS — Ground |
| Pin 46 | RC14 — General purpose I/O |
| Pin 47 | RC15 — General purpose I/O |
| Pin 48 | RG0 — General purpose I/O |
| Pin 49 | RG1 — General purpose I/O |
| Pin 50 | VSS — Ground |
| Pin 51 | RB8 — General purpose I/O |
| Pin 52 | RB9 — General purpose I/O |
| Pin 53 | RB10 — General purpose I/O |
| Pin 54 | RB11 — General purpose I/O |
| Pin 55 | RB12 — General purpose I/O |
| Pin 56 | RB13 — General purpose I/O |
| Pin 57 | RB14 — General purpose I/O |
| Pin 58 | RB15 — General purpose I/O |
| Pin 59 | RF4 — General purpose I/O |
| Pin 60 | RF5 — General purpose I/O |
| Pin 61 | RF3 — General purpose I/O |
| Pin 62 | VSS — Ground |
| Pin 63 | RF2 — General purpose I/O |
| Pin 64 | VDD — Supply voltage |
| Pin 65 | RD8 — General purpose I/O |
| Pin 66 | RD9 — General purpose I/O |
| Pin 67 | RD10 — General purpose I/O |
| Pin 68 | RD11 — General purpose I/O |
| Pin 69 | RD12 — General purpose I/O |
| Pin 70 | RD13 — General purpose I/O |
| Pin 71 | VSS — Ground |
| Pin 72 | RC12 — General purpose I/O |
| Pin 73 | RC13 — General purpose I/O |
| Pin 74 | RC0 — General purpose I/O |
| Pin 75 | RG2 — General purpose I/O |
| Pin 76 | RG3 — General purpose I/O |
| Pin 77 | RG12 — General purpose I/O |
| Pin 78 | RG13 — General purpose I/O |
| Pin 79 | RG14 — General purpose I/O |
| Pin 80 | VDD — Supply voltage |
| Pin 81 | RA9 — General purpose I/O |
| Pin 82 | RA10 — General purpose I/O |
| Pin 83 | RA11 — General purpose I/O |
| Pin 84 | RA12 — General purpose I/O |
| Pin 85 | RA13 — General purpose I/O |
| Pin 86 | RA6 — General purpose I/O |
| Pin 87 | RA7 — General purpose I/O |
| Pin 88 | VSS — Ground |
| Pin 89 | RC5 — General purpose I/O |
| Pin 90 | RC6 — General purpose I/O |
| Pin 91 | RC7 — General purpose I/O |
| Pin 92 | RC8 — General purpose I/O |
| Pin 93 | RC9 — General purpose I/O |
| Pin 94 | RF6 — General purpose I/O |
| Pin 95 | RF7 — General purpose I/O |
| Pin 96 | RF8 — General purpose I/O |
| Pin 97 | VDD — Supply voltage |
| Pin 98 | OSC1/CLKI/RC12 — Crystal oscillator input / external clock input |
| Pin 99 | OSC2/CLKO/RC15 — Crystal oscillator output / clock output |
| Pin 100 | VSS — Ground |
Typical Applications
PIC32MX320F128LT-80I/PT is suitable for 7 applications: Industrial Automation Controller, HVAC Control Board, Point-of-Sale (POS) Terminal, Medical Instrumentation, Human-Machine Interface (HMI) Display, Multi-axis Motor Control Pre-processor, Consumer Appliance Control.
Industrial Automation Controller
The PIC32MX320F128LT-80I/PT fits industrial automation controllers thanks to its 80 MHz MIPS32 M4K core delivering deterministic 32-bit performance for PLC scan loops, and 85 I/O pins that handle multiple sensor inputs and actuator outputs without external GPIO expanders. The 128 KB Flash accommodates IEC 61131-3 style firmware with field-device drivers, while 32 KB SRAM supports TCP/IP or Modbus TCP stack buffers. Industrial -40C to +85C rating handles cabinet environments. Five 16-bit timers enable precise PWM for motor and valve control. The PIC32MX320F128LT-80I/PT is pin-compatible with the rest of the PIC32MX3XX/4XX family, allowing easy upgrade to PIC32MX360 when more Flash is needed.
Recommended
HVAC Control Board
The PIC32MX320F128LT-80I/PT suits HVAC control boards because its 10-bit ADC samples up to 16 analog channels (temperature, pressure, airflow sensors) at 500 ksps, while 85 I/O pins drive relays, triacs, and status LEDs without external muxing. The 80 MHz MIPS core runs PID loops for compressor and blower control with deterministic scheduling. Industrial -40C to +85C operation covers rooftop and basement installations. Two UARTs allow simultaneous Modbus connection to a building management system and a local HMI. PMP and DMA support a small graphics LCD for local user interface, eliminating a separate display controller chip in cost-sensitive designs.
Recommended
Point-of-Sale (POS) Terminal
The PIC32MX320F128LT-80I/PT is appropriate for entry-level POS terminals where 32-bit performance, 128 KB Flash, and 32 KB SRAM cover application firmware plus small TCP/IP stacks. The PMP drives character LCDs or small graphic displays for cashier interfaces, while UARTs connect to magnetic-stripe readers, barcode scanners, and thermal receipt printers. DMA offloads printer data movement, freeing CPU cycles for transaction processing. Industrial temperature rating supports retail back-room environments. The 100-pin TQFP exposes ample I/O for keypad scanning (8x8 matrix) and peripheral expansion. For higher-end POS, upgrade to PIC32MX360F512L for additional Flash capacity.
Recommended
Medical Instrumentation
The PIC32MX320F128LT-80I/PT powers non-life-critical medical instrumentation such as benchtop analyzers, infusion-pump controllers, and patient monitors where its 10-bit ADC samples sensor signals with adequate resolution for trend monitoring. The MIPS32 M4K core's deterministic interrupt latency suits IEC 62304 software class B requirements when paired with proper firmware structure. The 100-pin TQFP exposes interfaces to displays, keypads, and audio alarms. Industrial -40C to +85C supports clinical environments. Note: this part is not FDA-cleared; final medical device qualification is the OEM's responsibility.
Recommended
Human-Machine Interface (HMI) Display
The PIC32MX320F128LT-80I/PT is well-suited as an HMI controller for small TFT/STN graphic displays because its Parallel Master Port (PMP) directly drives common 8-bit and 16-bit LCD interfaces without external logic, while DMA moves frame-buffer data with no CPU overhead. The 80 MHz MIPS core handles on-screen graphics rendering, button debouncing, and communication stacks simultaneously. 128 KB Flash stores fonts and bitmaps; 32 KB SRAM holds partial frame buffers. Two SPI channels support touch-screen controllers and external Flash for additional graphics assets. Industrial temperature rating supports factory-floor HMIs.
Recommended
Multi-axis Motor Control Pre-processor
The PIC32MX320F128LT-80I/PT acts as a motor-control command pre-processor in multi-axis systems, offloading trajectory planning from a higher-level CPU. Five 16-bit timers generate synchronized PWM references for downstream gate drivers, while DMA handles encoder feedback capture with deterministic latency. The 80 MHz MIPS32 core executes field-oriented control (FOC) math at the 10-20 kHz loop rates needed for BLDC and PMSM motors. UARTs and SPI connect to isolated communication buses (RS-485, CAN via external controller). The 100-pin TQFP package supports the required pin count for multi-axis expansion with spare GPIO for diagnostics.
Recommended
Consumer Appliance Control
The PIC32MX320F128LT-80I/PT is appropriate for consumer appliances (washing machines, dishwashers, ovens, refrigerators) where 32-bit performance handles user-interface logic, sensor fusion, and motor sequence control in one chip. The 85 I/O pins drive segmented LCD or LED displays, button matrices, and multiple triac/relay outputs without expanders. ADC channels monitor temperature, water level, and motor current. Industrial temperature rating covers under-cabinet and laundry-room heat exposure. The 128 KB Flash stores product variants and diagnostic logs; 32 KB SRAM supports small UI buffers. Cost-optimized family migration paths exist to PIC32MX230 at lower speeds or PIC32MX360 at higher Flash.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F128LT-80I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F128L-80I/PT | PIC32MX360F512L-80I/PT | PIC32MX230F128L-I/PT | PIC32MX340F128L-80I/PT | PIC32MX270F512L-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-pin TQFP (12x12 mm) | 100-pin TQFP - same | 100-pin TQFP - same | 100-pin TQFP - same | 100-pin TQFP - same | 100-pin TQFP - same |
| Maximum CPU Speed | 80 MHz | 80 MHz | 80 MHz | 50 MHz | 80 MHz | 50 MHz |
| Flash Memory | 128 KB | 128 KB | 512 KB | 128 KB | 128 KB | 512 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| USB | No | No | No | No | Yes (USB OTG) | Yes (USB OTG) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Packaging Form | Tape and Reel | Tray | Tray | Tray | Tray | Tray |
Key Differentiators
- Highest pin count variant of the PIC32MX320 family (vs PIC32MX320F064H-40I/PT)
- Drop-in upgrade path to PIC32MX360 with 4x Flash (vs PIC32MX360F512L-80I/PT)
- Industrial temperature grade with no automotive premium (vs PIC32MX340F128L-80I/PT (USB variant))
Design Notes
Place a 10 uF bulk capacitor and a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pin pair on the PIC32MX320F128LT-80I/PT. With 12 VDD pins across the 100-pin TQFP, distribute the bulk capacitance evenly rather than clustering it near one corner. Use a ferrite bead on the analog VDD rail (AVDD) if available on the pinout, and separate analog ground (AVSS) from digital VSS with a star-ground connection under the MCU. The internal voltage regulator for the core draws transient current on the order of 50-80 mA during 80 MHz operation; inadequate bulk capacitance produces VDD sag and oscillator instability.
Route the 80 MHz system clock traces (OSC1/OSC2) as short, length-matched differential-style traces with a continuous ground pour underneath. Keep the crystal within 5 mm of the MCU and surround it with a ground guard ring. The 100-pin TQFP at 12x12 mm has a 0.5 mm pitch, which is fine for 4-layer PCB manufacturing but requires 0.2-0.25 mm via-in-pad for any BGA escape - not relevant here, but the same impedance discipline applies to the parallel master port (PMP) data/address bus. Provide a 4-layer stackup with dedicated power and ground planes for any design using PMP at full bus speed.
Do not exceed 3.6V on any VDD pin; the PIC32MX320 is a 2.3V-3.6V part, not 5V tolerant on VDD (only the digital I/O pins tolerate 5V input). When migrating from PIC32MX320 to PIC32MX360 or PIC32MX270, verify the peripheral library mapping - some peripheral registers are at different addresses across families even though the pinout is compatible. The 10-bit ADC requires the acquisition time to be configured for the source impedance; with high-impedance sensors (>5 kOhm) increase ACQT to avoid inaccurate conversions. Avoid placing the MCU directly above switching regulator inductors to prevent conducted EMI coupling into the ADC reference.
Reserve the PGECx/PGEDx pins as dedicated debug pins even in production designs; routing them through test pads or zero-ohm resistors adds field-reprogramming capability at minimal BOM cost. The ICSP interface on PIC32MX320F128LT-80I/PT uses PGEC2/PGED2 (RB6/RB7) by default, but PGEC1/PGED1 (RG14/RG15) is also supported. Use Microchip's recommended 4.7 kOhm pull-up on MCLR and a 100 nF cap on MCLR for proper reset behavior. Place the MCLR reset capacitor as close as physically possible to the MCU to avoid EMI-induced resets.
Compliance Information
Industrial temperature grade (-40C to +85C). Not AEC-Q100 qualified; not suitable for automotive safety-critical applications. RoHS and REACH compliant per Microchip product page; lead-free reflow-compatible.
