PIC32MX320F032H-40I/PT - 32-bit MCU, 32KB Flash, 40MHz | Microchip
MPN: PIC32MX320F032H-40I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.15 | $415.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.32 | $3,320.00 |
PIC32MX320F032H-40I/PT Overview
A microcontroller (MCU) is a single-chip computer integrating a CPU core, program memory (Flash), data memory (SRAM), and peripherals such as timers, communication interfaces, and GPIO. Within the broader semiconductor hierarchy, an MCU sits below microprocessors (MPUs) in integration: MCUs embed Flash/RAM on-die and target deterministic real-time control, while MPUs rely on external memory and run rich operating systems. The PIC32MX3XX/4XX family specifically bridges 8-bit PIC simplicity with 32-bit MIPS performance.
Key features of this part include the M4K MIPS32 core capable of 40 MHz (50 DMIPS/1.56 DMIPS/MHz), 32 KB on-chip Flash, 8 KB SRAM, a 10-bit 1 Msps ADC with up to 16 channels, USB 2.0 full-speed OTG, two UART, and two SPI/I2C peripherals. Industrial temperature grade (-40C to +85C) and 5V-tolerant digital I/O make it suitable for harsh environments. The TQFP-64 footprint exposes all major peripheral pins including PGECx/PGEDx for in-circuit serial programming (ICSP).
Architecturally, the PIC32MX3XX/4XX family uses a Harvard architecture with separate Flash and SRAM buses, allowing simultaneous instruction and data fetch. The 32-bit MIPS M4K core executes most instructions in a single cycle and includes a prefetch cache to mask flash wait states. Peripheral DMA is mapped onto master peripherals to offload CPU during high-bandwidth transfers. CodeGuard security is built in for IP protection.
Typical applications include USB peripherals, industrial control PLCs, sensor hubs, home automation gateways, and low-cost HMI displays. The combination of USB, ADC, and GPIO density in a single chip reduces BOM and PCB complexity. The wide 2.3 V - 3.6 V supply range simplifies designs using Li-ion or 3.3 V regulated rails.
When designing with this device, ensure the trace length between the ICSP connector and the PGECx/PGEDx pins remains short for stable programming/debug. Decouple VDD with a 0.1 uF ceramic near each power pin. Do not exceed 3.6 V on any supply pin; digital inputs are 5V-tolerant but analog references must respect VDD.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC32MX320F032H-40I/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 PIC32MX320F032H-40I/PT (same form factor and footprint) — differing in Package, Operating Temperature, ADC, USB, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F064H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F032HT-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F128H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F032H-40V/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F032H-40I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| CPU Speed | 40 MHz |
| Program Memory (Flash) | 32 KB |
| Data Memory (SRAM) | 8 KB |
| Supply Voltage | 2.3 V to 3.6 V |
| I/O Pins | 53 |
| ADC | 10-bit, 1 Msps |
| Package | TQFP-64 (10x10 mm) |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed OTG |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| RoHS Status | Compliant |
PIC32MX320F032H-40I/PT Pin Configuration
| Pin 1 | RG15 — General purpose I/O |
| Pin 2 | RG13 — General purpose I/O |
| Pin 3 | RG12 — General purpose I/O |
| Pin 4 | VDD — Power supply (3.3V) |
| Pin 5 | RF0 — General purpose I/O |
| Pin 6 | RF1 — General purpose I/O |
| Pin 7 | PGEC1 — Programming clock (ICSP) |
| Pin 8 | PGED1 — Programming data (ICSP) |
| Pin 9 | RB5 — General purpose I/O / PGED2 |
| Pin 10 | RB4 — General purpose I/O / PGEC2 |
| Pin 11 | RB3 — General purpose I/O |
| Pin 12 | RB2 — General purpose I/O |
| Pin 13 | RB1 — General purpose I/O |
| Pin 14 | RB0 — General purpose I/O |
| Pin 15 | RB6 — General purpose I/O |
| Pin 16 | RB7 — General purpose I/O |
| Pin 17 | AVDD — Analog power supply |
| Pin 18 | AVSS — Analog ground |
| Pin 19 | VREF+ — ADC positive reference |
| Pin 20 | VREF- — ADC negative reference |
| Pin 21 | AN0/RB8 — Analog input / GPIO |
| Pin 22 | AN1/RB9 — Analog input / GPIO |
| Pin 23 | AN2/RB10 — Analog input / GPIO |
| Pin 24 | AN3/RB11 — Analog input / GPIO |
| Pin 25 | AN4/RB12 — Analog input / GPIO |
| Pin 26 | AN5/RB13 — Analog input / GPIO |
| Pin 27 | AN6/RB14 — Analog input / GPIO |
| Pin 28 | AN7/RB15 — Analog input / GPIO |
| Pin 29 | VDD — Power supply |
| Pin 30 | VSS — Ground |
| Pin 31 | RC0 — General purpose I/O |
| 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 | RD0 — General purpose I/O |
| Pin 37 | RD1 — General purpose I/O |
| Pin 38 | RD2 — General purpose I/O |
| Pin 39 | RD3 — General purpose I/O |
| Pin 40 | RD4 — General purpose I/O |
| Pin 41 | RD5 — General purpose I/O |
| Pin 42 | RD6 — General purpose I/O |
| Pin 43 | RD7 — General purpose I/O |
| Pin 44 | VUSB — USB voltage reference |
| Pin 45 | D+ — USB D+ data line |
| Pin 46 | D- — USB D- data line |
| Pin 47 | RD11 — General purpose I/O |
| Pin 48 | RD12 — General purpose I/O |
| Pin 49 | RD13 — General purpose I/O |
| Pin 50 | RD14 — General purpose I/O |
| Pin 51 | RD15 — General purpose I/O |
| Pin 52 | VCAP — Internal voltage regulator bypass |
| Pin 53 | RF4 — General purpose I/O |
| Pin 54 | RF5 — General purpose I/O |
| Pin 55 | RF6 — General purpose I/O |
| Pin 56 | RF7 — General purpose I/O |
| Pin 57 | RF8 — General purpose I/O |
| Pin 58 | RF12 — General purpose I/O |
| Pin 59 | RF13 — General purpose I/O |
| Pin 60 | RA0 — General purpose I/O |
| Pin 61 | RA1 — General purpose I/O |
| Pin 62 | RA3 — General purpose I/O |
| Pin 63 | RA4 — General purpose I/O |
| Pin 64 | OSC1/RA2 — Crystal oscillator input |
Typical Applications
PIC32MX320F032H-40I/PT is suitable for 6 applications: USB Human Interface Device (HID), Industrial Sensor Hub, Home Automation Gateway, Low-Cost HMI Display Controller, Portable Data Logger, Educational Development Platform.
USB Human Interface Device (HID)
The PIC32MX320F032H-40I/PT's integrated USB 2.0 full-speed OTG controller with 40 MHz MIPS M4K core and 8 KB SRAM is ideal for USB HID peripherals such as keyboards, mice, and game controllers. The on-chip USB transceiver eliminates the external PHY, reducing BOM by $0.40-$0.80. According to the Microchip PIC32MX3XX/4XX datasheet, the part supports HID, CDC, and mass-storage classes via the Microchip Harmony USB stack. With 32 KB Flash, the device runs typical HID stacks within 16-20 KB leaving headroom for application code. The 53 GPIO easily accommodates button matrices and LED indicators on USB peripherals.
Recommended
Industrial Sensor Hub
The PIC32MX320F032H-40I/PT is well-suited as an industrial sensor hub aggregating analog and digital sensor data. The 10-bit 1 Msps ADC with up to 16 channels handles multiple analog transducers simultaneously, while two UART/SPI/I2C peripherals connect to digital sensors, displays, and Modbus networks. The -40C to +85C industrial temperature rating per the Microchip datasheet allows deployment in factory environments. The 32 KB Flash stores sensor calibration tables, while 8 KB SRAM buffers streaming data before forwarding via UART or USB.
Recommended
Home Automation Gateway
The PIC32MX320F032H-40I/PT makes a cost-effective home automation gateway bridging Wi-Fi/Zigbee modules to local control buses. With 53 GPIO and 2.3-3.6 V operation, it can host multiple UART-connected wireless modules, drive relay outputs, and read digital inputs from wall switches. The 40 MHz MIPS core runs MQTT or CoAP stacks over Ethernet or Wi-Fi via SPI. The TQFP-64 (10x10 mm) package is easy to hand-solder or reflow on standard 2-layer PCBs common in consumer gateway hardware.
Recommended
Low-Cost HMI Display Controller
The PIC32MX320F032H-40I/PT can drive character or small graphic TFT displays as a low-cost HMI controller. The SPI peripheral reaches up to 20 MHz for fast display updates, while the 8 KB SRAM holds frame buffers for small color TFTs. The 32 KB Flash stores multiple language strings, fonts, and HMI state machines. According to the Microchip datasheet, the parallel PMP (Parallel Master Port) interface can drive up to 16-bit displays in addition to SPI/I2C. The 53 GPIO provide touch-screen and button matrix interfacing.
Recommended
Portable Data Logger
The PIC32MX320F032H-40I/PT suits battery-powered data loggers due to its 2.3-3.6 V supply range and multiple low-power modes. The 10-bit ADC captures sensor data while the MCU sleeps between samples, extending battery life to months on a single Li-ion cell. The 8 KB SRAM buffers log entries before flushing to external EEPROM or SD card via SPI. The industrial -40C to +85C temperature rating per Microchip allows deployment in outdoor or automotive environments.
Recommended
Educational Development Platform
The PIC32MX320F032H-40I/PT is commonly used in university courses and hobbyist projects due to its 32-bit MIPS architecture at an 8-bit price point. The Microchip MPLAB X IDE supports the part with the free XC32 compiler, and PICkit 5 debuggers program via the PGECx/PGEDx pins. With 32 KB Flash, students can complete real embedded projects including USB, RTOS, and TCP/IP examples. The 53 GPIO provide ample breadboard access for peripherals.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F032H-40I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F064H-40I/PT | PIC32MX320F032HT-40I/PT | PIC32MX340F128H-40I/PT | PIC32MX320F032H-40V/PT |
|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 64 KB | 32 KB | 128 KB | 32 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 32 KB | 8 KB |
| CPU Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +105C |
| USB | USB 2.0 OTG FS | USB 2.0 OTG FS | USB 2.0 OTG FS | USB 2.0 OTG FS | USB 2.0 OTG FS |
| ADC | 10-bit 1 Msps | 10-bit 1 Msps | 10-bit 1 Msps | 10-bit 1 Msps | 10-bit 1 Msps |
Key Differentiators
- Same-family upgrade path with double Flash (vs PIC32MX320F064H-40I/PT)
- Four times the SRAM and Flash for richer applications (vs PIC32MX340F128H-40I/PT)
- Extended temperature range for harsh environments (vs PIC32MX320F032H-40V/PT)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of every VDD/AVDD pin. Add a single 10 uF bulk capacitor on each power rail near the device. Keep analog (AVSS) and digital grounds connected at a single point under the IC to avoid ground loops in ADC readings. The Microchip PIC32MX3XX/4XX datasheet section 2.4 recommends a 4-layer PCB for best ADC performance but 2-layer boards with proper layout are acceptable for 8-10 effective bits.
Keep the trace length between the ICSP connector and the PGEC1/PGED1 pins (and optionally PGEC2/PGED2 for 4-wire) under 50 mm total per Microchip programming specification. Add 4.7 kohm pull-up resistors on D+ and D- if USB is used. The 48 MHz HSUSB mode requires a 4.7 uF low-ESR capacitor on the VCAP pin to stabilize the on-chip 2.5V regulator; do not omit this capacitor as the USB PLL will fail to lock.
Do not exceed 3.6 V on any VDD or AVDD pin even though digital I/O are 5V-tolerant; only I/O pins tolerate 5V inputs. Always run the configuration bits pragma to set the appropriate oscillator, watchdog, and code-protection settings; failure to do so may leave the device in an unprogrammed state. The 32 KB Flash includes the configuration word and boot Flash regions, leaving approximately 30-31 KB for user code per the Microchip linker scripts. Do not forget to enable the JTAG/debug port via configuration bits when using MPLAB X debugger.
Use the internal 8 MHz FRC oscillator with PLL to reach 40 MHz without an external crystal, saving two GPIOs and BOM cost. If USB is used, the 48 MHz USB clock must be derived from a primary oscillator or the 8 MHz FRC with PLL. The device supports sleep, idle, and deep-sleep modes with wake-up from internal RTCC. Estimated: at 40 MHz active, the core draws ~30 mA; deep-sleep drops to ~30 uA per the Microchip PIC32MX3XX/4XX datasheet DC characteristics section.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. AEC-Q100 automotive qualification not available for this part - consider PIC32MX320F064H-40I/PT automotive variants if needed.
