PIC32MX420F032HT-40I/MR - 32-bit 40MHz MCU 32KB Flash 64-VQFN | Microchip
MPN: PIC32MX420F032HT-40I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.59 | $75.90 |
| 100 | $6.78 | $678.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.74 | $5,740.00 |
PIC32MX420F032HT-40I/MR Overview
A 32-bit microcontroller (MCU) is an embedded processor with a 32-bit data path, on-chip Flash program memory and SRAM, plus a configurable peripheral set, designed to execute complex code in real-time for connected or signal-processing applications. The PIC32MX4xx family extends the PIC ecosystem to MIPS M4K core performance, enabling entry-level graphical USB, audio, and sensing designs at consumer-grade pricing.
Key differentiating features include single-cycle multiply/divide, hardware DMA for ADC and USB, a 16-channel 10-bit 1 Msps ADC, four 16-bit timers, two I2C, two SPI, and two UART channels, plus USB OTG with integrated transceiver. The CTMU module supports touch sensing, mTouch capacitive buttons, and precise time measurement. The 64-VQFN (9x9 mm) package with exposed pad delivers thermal resistance of approximately 27 C/W theta-JA when properly soldered to a 4-layer board with adequate copper.
The architecture combines a 5-stage MIPS M4K pipeline, dual-bank Flash with prefetch, a 32 KB unified cache, and an 8 KB SRAM. The peripheral bus operates at the system clock divided by two, allowing fast I/O without CPU stall. The device includes a 16-bit wide instruction bus and supports MIPS16e code compression, reducing Flash footprint by approximately 30 percent.
Typical applications include USB peripherals, consumer audio devices, industrial control and HMI, sensor aggregation, and low-cost connectivity bridges. In USB audio dongle designs the part's integrated USB OTG transceiver and I2S interface eliminate external bridge chips. The 64-pin VQFN gives enough I/O for 4-wire touch + LCD + USB designs without needing a larger package.
When designing with this device, pay attention to the VQFN thermal pad layout: the central exposed pad must be soldered to a continuous ground copper pour with thermal vias to inner layers. Program code placement in the lower Flash bank improves prefetch efficiency and execution speed for sequential code. Decoupling must include at least one 0.1 uF ceramic on every VDD pin pair plus a single 10 uF bulk capacitor.
This page consolidates Microchip datasheet parameters, distributor stock and pricing, drop-in same-package alternatives, and applied engineering notes not found on a single manufacturer page.
Drop-in alternatives for PIC32MX420F032HT-40I/MR — 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 PIC32MX420F032HT-40I/MR (same form factor and footprint) — differing in Package, ADC, DMA Channels, USB, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX420F032H-40I/MR
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC32MX320F032HT-40I/MR
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC32MX430F064HT-40I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX340F128H-80I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX350F128HT-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX420F032HT-40I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K |
| Core Count | 1 (Single-Core) |
| Maximum Clock Speed | 40 MHz |
| Program Memory (Flash) | 32 KB (32K x 8) |
| Data Memory (SRAM) | 8 KB |
| Operating Voltage (VDD) | 2.3 V to 3.6 V |
| GPIO Pins | 53 |
| ADC | 10-bit, up to 16 channels |
| ADC Sample Rate | 1 Msps |
| USB | USB 2.0 Full-Speed OTG with integrated transceiver |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| Timers | 4 x 16-bit, 1 x RTCC |
| DMA Channels | 8 (hardware) |
| CTMU Module | Yes (touch / mTouch / time measurement) |
| Package | 64-VQFN (9x9 mm) with exposed thermal pad |
| Mounting Type | Surface Mount (Tape and Reel) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | 3 (168 hours) |
PIC32MX420F032HT-40I/MR 64-vqfn (9x9 mm) with exposed thermal pad Pin Configuration Guide
Pin configuration for PIC32MX420F032HT-40I/MR (64-vqfn (9x9 mm) with exposed thermal pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC32MX420F032HT-40I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC32MX420F032HT-40I/MR is suitable for 7 applications: USB HID Peripheral (Keyboard / Mouse / Custom), USB Audio Class Dongle / Headset, Capacitive Touch HMI (mTouch / Buttons / Slider), Industrial Sensor Aggregator / IoT Edge Node, USB Barcode / RFID Reader, Consumer Appliance Control Board, Educational Development Platform.
USB HID Peripheral (Keyboard / Mouse / Custom)
The PIC32MX420F032HT-40I/MR is an excellent fit for USB Human Interface Devices because it integrates a USB 2.0 full-speed OTG transceiver with on-chip PHY, eliminating the need for external bridge chips. Its 32 KB Flash and 8 KB SRAM comfortably accommodate the Microchip USB HID stack plus application logic for a custom keyboard, gaming mouse, or industrial control pendant. At 40 MHz the core handles 1 ms polling intervals with ample margin for matrix scanning, debouncing, and USB report composition. The 53 GPIO pins are sufficient to scan a full 8x20 mechanical-key matrix plus RGB underglow LEDs.
Recommended
USB Audio Class Dongle / Headset
For USB Audio Class 1.0 designs at 44.1 kHz / 16-bit, the PIC32MX420F032HT-40I/MR delivers sufficient DSP headroom for sample-rate conversion and basic audio processing. The integrated USB OTG controller pairs with an external I2S DAC such as the PCM5102A to build a complete USB-to-S/PDIF or USB-to-headphone dongle. The 32 KB Flash stores USB audio descriptors and a small RTOS scheduler; the 8 KB SRAM holds one stereo buffer at 8 ms latency. Power consumption stays under 50 mA, allowing bus-powered operation without external regulators.
Recommended
Capacitive Touch HMI (mTouch / Buttons / Slider)
The PIC32MX420F032HT-40I/MR's Charge Time Measurement Unit (CTMU) enables Microchip's mTouch capacitive touch-sensing firmware, supporting up to 16 buttons or a 5-segment slider with no external components beyond the sensor pads and decoupling. The 10-bit ADC samples each channel in under 2 us, allowing a full keypad scan in under 50 ms with hardware averaging for noise immunity. The 53 GPIO pins easily accommodate 4-wire resistive touch plus a 320x240 TFT display driven by the PMP peripheral. Industrial-grade -40 to +85 C operation supports factory-floor HMI panels.
Recommended
Industrial Sensor Aggregator / IoT Edge Node
In industrial sensor aggregation, the PIC32MX420F032HT-40I/MR reads multiple analog sensors through its 16-channel 10-bit ADC at up to 1 Msps aggregate, applies calibration in software, and forwards the data over UART, SPI, or USB to a host PLC or gateway. The 32 KB Flash holds a simple Modbus RTU or CAN-light stack plus application logic, and the 8 KB SRAM buffers 1,000+ 16-bit samples. The dual I2C and dual SPI buses connect to multiple temperature, pressure, and flow sensors simultaneously. The -40 to +85 C rating and RoHS compliance suit factory-floor deployments.
Recommended
USB Barcode / RFID Reader
The PIC32MX420F032HT-40I/MR's integrated USB OTG plus UART interfaces make it a natural fit for USB-attached barcode scanners and RFID readers. The 40 MHz core decodes 1D and 2D barcodes from a CMOS image sensor over the PMP port, while a CC1101 sub-GHz transceiver on SPI adds RFID read capability. The 8 KB SRAM buffers decoded packets for USB transmission, and the 53 GPIO drive up to 4 LED indicators, a buzzer, and a trigger switch without external logic. Industrial temperature range and ESD-hardened USB pins support retail and warehouse use.
Recommended
Consumer Appliance Control Board
White-goods and small appliances benefit from the PIC32MX420F032HT-40I/MR's combination of USB diagnostics, mTouch buttons, ADC sensor inputs, and PWM-driven motor or heater control. The 32 KB Flash stores a small graphical menu plus state machine, while the 8 KB SRAM holds the operating-mode buffer. The CTMU drives 8-12 capacitive touch keys without external components, and the 16-channel ADC reads temperature, humidity, and current sensors. The 64-VQFN package enables single-side PCB assembly with a compact 50x70 mm control board.
Recommended
Educational Development Platform
Universities and training centers favor the PIC32MX420F032HT-40I/MR as an entry-level 32-bit teaching platform because it combines USB, ADC, CTMU, and PMP peripherals in a single chip at low cost. The 40 MHz MIPS M4K core provides enough headroom for teaching RTOS concepts, signal processing, and USB protocols without overwhelming students. MPLAB X IDE and Harmony framework are free of charge, and PICkit 4 / PICkit 5 in-circuit debuggers support the part natively. The 64-VQFN package exposes enough I/O for breadboard-friendly breakout boards.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX420F032HT-40I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX420F032H-40I/MR | PIC32MX320F032HT-40I/MR | PIC32MX430F064HT-40I/MR | PIC32MX340F128H-80I/MR | PIC32MX350F128HT-I/MR |
|---|---|---|---|---|---|---|
| Package | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit | MIPS M4K 32-bit |
| Maximum Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 80 MHz | 50 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 128 KB | 128 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 32 KB | 32 KB |
| USB OTG | Yes (integrated FS PHY) | Yes | No | Yes | Yes (FS only) | Yes |
| GPIO Pins | 53 | 53 | 53 | 53 | 53 | 53 |
| ADC | 10-bit, 16-ch, 1 Msps | 10-bit, 16-ch | 10-bit, 16-ch | 10-bit, 16-ch | 10-bit, 16-ch | 10-bit, 16-ch |
| Operating Voltage | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V |
| Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Integrated USB 2.0 Full-Speed OTG PHY (no external bridge chip required) (vs PIC32MX320F032HT-40I/MR)
- 2x Flash memory headroom for firmware growth (vs PIC32MX420F032H-40I/MR (same silicon, tray pack))
- Lower price at qty 1 vs memory-upgraded siblings (vs PIC32MX340F128H-80I/MR)
- Dual package options (VQFN-64, TQFP-64) within same family for design flexibility (vs PIC32MX320F032HT-40I/MR)
Design Notes
The 64-VQFN (9x9 mm) exposed thermal pad must be soldered to a continuous ground copper pour with at least 9 thermal vias (0.3 mm drill, 0.6 mm pad, 1.0 mm pitch) connecting to inner ground planes. According to Microchip datasheet DS60001168, the resulting theta-JA is approximately 27 C/W on a 4-layer JEDEC EIA/JESD51 test board. At 40 MHz with all peripherals active, typical power consumption is 65 mW, so junction rise above ambient stays below 5 C with proper pad soldering. Do not leave the EP floating; this causes thermal runaway and violates DC bias conditions.
Decoupling must include one 0.1 uF X7R ceramic on every VDD pin pair (4 pins total on the VQFN), placed within 3 mm of the pin, plus a single 10 uF X5R bulk capacitor on the same net. The AVDD pin requires a separate 0.1 uF + 10 uF pair with an LC ferrite (600 ohm at 100 MHz) from VDD to keep ADC reference noise below 1 LSB. The VBUS pin on USB designs must have a 0.1 uF + 4.7 uF pair and an ESD protection array (USBLC6-2SC6) within 5 mm of the connector. Trace impedance for USB D+/D- must be 90 ohm differential per USB 2.0 specification.
Do not confuse PIC32MX420 (with USB OTG) and PIC32MX320 (without USB) when ordering - the part numbers differ only in the middle digit and the silicon is not interchangeable for USB designs. The MCLR pin requires a 10 kohm pull-up to VDD with a 100 nF cap to ground for proper reset behavior; floating MCLR causes unreliable startups. The PGED1/PGEC1 programming pins must not be pulled low at boot, or the part enters debug mode. Configuration bits must be set to disable JTAG and enable the appropriate oscillator mode before code execution; defaults are not appropriate for most designs.
Place the 8 MHz primary crystal within 5 mm of the OSC1/OSC2 pins with short traces surrounded by a grounded copper keepout. The 32.768 kHz secondary crystal for RTCC likewise needs a 5 mm placement window. USB D+ and D- traces must be length-matched within 2 mm and routed over a continuous ground plane, never over power planes or split grounds. The ADC analog inputs must be routed away from switching signals; if this is impossible, place a guard ground trace between the analog and digital nets. The exposed pad is the primary ground return - do not route signals under the package.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40 to +85 C temperature range, not AEC-Q100 qualified - select PIC32MX274F256DT-I/PT for automotive. Lead-free matte-tin finish. Halogen-free status not stated in distributor data; consult Microchip directly for documentation.
