PIC32MX420F032H-40I/PT - 32-bit MCU 32KB Flash 8KB RAM 40MHz | Microchip
MPN: PIC32MX420F032H-40I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.73 | $5.73 |
| 10 | $5.16 | $51.60 |
| 100 | $4.59 | $459.00 |
| 500 | $4.07 | $2,035.00 |
| 1,000 | $3.61 | $3,610.00 |
PIC32MX420F032H-40I/PT Overview
A 32-bit microcontroller (MCU) is an integrated processor core, memory, and peripherals built on a single silicon die, designed to execute embedded control tasks. The PIC32MX family uses the MIPS32 M4K core architecture, a Harvard-style RISC design with separate instruction and data paths that enable single-cycle Flash accesses. Within the broader taxonomy, PIC32MX MCUs belong to the Microchip PIC® family, which scales from 8-bit PIC16/PIC18 devices to 16-bit dsPIC® DSCs and 32-bit PIC32 parts. This positions the PIC32MX420F as a mid-range general-purpose controller for cost-sensitive embedded designs.
The device integrates 32 KB Flash, 8 KB SRAM, USB-OTG full-speed PHY, a 10-bit 1 Msps ADC with up to 16 channels, five 16-bit timers, two UART, two SPI, two I2C, and a parallel master port (PMP). The M4K core provides single-cycle multiply, hardware divide, and a 5-stage pipeline that reaches 1.56 DMIPS/MHz. An 8-channel DMA controller offloads peripheral servicing from the core.
Typical use cases include USB peripherals (HID, CDC, mass storage, audio class), industrial HMI panels, low-cost graphics terminals via PMP, sensor hubs with USB bridging, and general-purpose embedded controllers. The 32 KB Flash / 8 KB RAM balance makes it well-suited for USB device stacks that need the extra code space.
When designing with this MCU, add a 32.768 kHz secondary crystal if USB suspend current compliance is required, and follow the trace-length rule and PCB layout guideline for the USB D+/D- differential pair as documented in the PIC32MX3XX/4XX family datasheet. This page synthesizes distributor pricing, pin-compatible PIC32 family alternatives, and application guidance not aggregated on distributor sites.
Drop-in alternatives for PIC32MX420F032H-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 PIC32MX420F032H-40I/PT (same form factor and footprint) — differing in Package, ADC, Core Architecture, USB, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX420F032H-40V/PT
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →PIC32MX420F032HT-40I/PT
✅ Drop-In✓ In Stock
$3.42 / Unit
View Datasheet →PIC32MX320F064H-40I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F064HT-40I/PT
✅ Drop-In✓ In Stock
$4.16 / Unit
View Datasheet →PIC32MX320F032H-40I/PT
✅ Drop-In✓ In Stock
$3.32 / Unit
View Datasheet →PIC32MX270F256B-50I/SO
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →PIC32MX420F032H-40I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K (Harvard) |
| Core Width | 32-bit |
| Maximum CPU Frequency | 40 MHz |
| Performance | 1.56 DMIPS/MHz |
| Program Flash | 32 KB (32K x 8) |
| SRAM | 8 KB |
| Operating Voltage | 2.3 V to 3.6 V |
| ADC | 10-bit, up to 16 channels |
| USB | USB-OTG, Full Speed |
| Timers | 5 x 16-bit |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| Parallel Master Port (PMP) | Yes |
| DMA Channels | 8 |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX420F032H-40I/PT Pin Configuration
| Pin 1 | RF5 — General purpose I/O |
| Pin 2 | RF4 — General purpose I/O |
| Pin 3 | RPB5 — Remappable peripheral I/O |
| Pin 4 | VSS — Ground |
| Pin 5 | RPB6 — Remappable peripheral I/O |
| Pin 6 | RPB7 — Remappable peripheral I/O |
| Pin 7 | RPB8 — Remappable peripheral I/O |
| Pin 8 | RPB9 — Remappable peripheral I/O |
| Pin 9 | RPB10 — Remappable peripheral I/O |
| Pin 10 | RPB11 — Remappable peripheral I/O |
| Pin 11 | VSS — Ground |
| Pin 12 | VDD — Positive supply (2.3 V to 3.6 V) |
| Pin 13 | RPB12 — Remappable peripheral I/O |
| Pin 14 | RPB13 — Remappable peripheral I/O |
| Pin 15 | RPB14 — Remappable peripheral I/O |
| Pin 16 | RPB15 — Remappable peripheral I/O |
| Pin 17 | VSS1 — Ground |
| Pin 18 | VDD1 — Positive supply (2.3 V to 3.6 V) |
| Pin 19 | PGEC1 — ICSP programming clock |
| Pin 20 | PGED1 — ICSP programming data |
| Pin 21 | PGEC2 — ICSP programming clock (alternate) |
| Pin 22 | PGED2 — ICSP programming data (alternate) |
| Pin 23 | TRST — JTAG test reset |
| Pin 24 | TCK — JTAG test clock |
| Pin 25 | TDI — JTAG test data in |
| Pin 26 | TDO — JTAG test data out |
| Pin 27 | TMS — JTAG test mode select |
| Pin 28 | VSS — Ground |
| Pin 29 | VDD — Positive supply (2.3 V to 3.6 V) |
| Pin 30 | RPC0 — Remappable peripheral I/O |
| Pin 31 | RPC1 — Remappable peripheral I/O |
| Pin 32 | RPC2 — Remappable peripheral I/O |
| Pin 33 | RPC3 — Remappable peripheral I/O |
| Pin 34 | RPC4 — Remappable peripheral I/O |
| Pin 35 | RPC5 — Remappable peripheral I/O |
| Pin 36 | RPC6 — Remappable peripheral I/O |
| Pin 37 | RPC7 — Remappable peripheral I/O |
| Pin 38 | RPC8 — Remappable peripheral I/O |
| Pin 39 | RPC9 — Remappable peripheral I/O |
| Pin 40 | VSS — Ground |
| Pin 41 | VDD — Positive supply (2.3 V to 3.6 V) |
| Pin 42 | RPD0 — Remappable peripheral I/O |
| Pin 43 | RPD1 — Remappable peripheral I/O |
| Pin 44 | RPD2 — Remappable peripheral I/O |
| Pin 45 | RPD3 — Remappable peripheral I/O |
| Pin 46 | RPD4 — Remappable peripheral I/O |
| Pin 47 | RPD5 — Remappable peripheral I/O |
| Pin 48 | RPD6 — Remappable peripheral I/O |
| Pin 49 | RPD7 — Remappable peripheral I/O |
| Pin 50 | RPD8 — Remappable peripheral I/O |
| Pin 51 | RPD9 — Remappable peripheral I/O |
| Pin 52 | RPD10 — Remappable peripheral I/O |
| Pin 53 | RPD11 — Remappable peripheral I/O |
| Pin 54 | RPD12 — Remappable peripheral I/O |
| Pin 55 | RPD13 — Remappable peripheral I/O |
| Pin 56 | RPD14 — Remappable peripheral I/O |
| Pin 57 | RPD15 — Remappable peripheral I/O |
| Pin 58 | VSS — Ground |
| Pin 59 | VDD — Positive supply (2.3 V to 3.6 V) |
| Pin 60 | D+ — USB D+ data line |
| Pin 61 | D- — USB D- data line |
| Pin 62 | VBUS — USB VBUS detect |
| Pin 63 | VUSB — USB transceiver supply (3.3 V) |
| Pin 64 | RF3 — General purpose I/O |
Typical Applications
PIC32MX420F032H-40I/PT is suitable for 6 applications: USB HID / CDC / Mass Storage Devices, Industrial HMI Panels and PMP Displays, Sensor Hub with USB Bridge, Low-Cost Audio Class USB Devices, General-Purpose Embedded Controller, USB Bootloader and Field-Upgradable Nodes.
USB HID / CDC / Mass Storage Devices
The PIC32MX420F032H-40I/PT's integrated USB-OTG full-speed PHY and 40 MHz MIPS M4K core make it well suited for USB device-class implementations including HID keyboards, CDC virtual COM ports, and USB mass storage devices. The 32 KB Flash fits the Microchip Harmony HID stack with class driver overhead, while 8 KB SRAM is sufficient for endpoint buffers and a small working set. Unlike external PHY designs, the on-chip PHY eliminates discrete components and reduces BOM cost. Place a 90-ohm common-mode choke on the D+/D- lines per the PIC32MX3XX/4XX family datasheet for EMI compliance.
Recommended
Industrial HMI Panels and PMP Displays
The PIC32MX420F032H-40I/PT parallel master port (PMP) interfaces directly to TFT LCD panels and external graphics controllers, making the part useful for low-cost industrial HMI panels and operator keypads. The 40 MHz core delivers enough throughput to refresh small QVGA displays via PMP with a modest frame buffer in the 8 KB SRAM. The 10-bit ADC reads front-panel potentiometers and temperature sensors. Industrial -40C to +85C temperature range (I-grade) suits factory floor enclosures, per the PIC32MX3XX/4XX family datasheet.
Recommended
Sensor Hub with USB Bridge
The PIC32MX420F032H-40I/PT can aggregate sensor data from SPI/I2C peripherals and present it over USB to a host PC. Two SPI and two I2C interfaces let the MCU read multiple sensors in a sensor hub arrangement, while USB-OTG exposes the data stream to the host. The 32 KB Flash accommodates sensor-fusion and pre-processing code, and the 8-channel DMA offloads peripheral servicing. Compared with discrete USB-to-I2C bridges, this approach adds local intelligence and conditioning, per the PIC32MX3XX/4XX family datasheet.
Recommended
Low-Cost Audio Class USB Devices
The PIC32MX420F032H-40I/PT supports USB audio class 1.0 device operation with sample-rate feedback synchronization using its 16-bit timers. The 40 MHz core, while not suited for high-fidelity audio DSP, handles USB isochronous transfers at 48 kHz mono adequately for intercom or basic audio peripherals. The 32 KB Flash fits the Harmony USB audio class driver, and 8 KB SRAM buffers small USB packets. The on-chip USB-OTG PHY eliminates external transceivers for an 8 kHz mono intercom-grade link, per the PIC32MX3XX/4XX family datasheet.
Recommended
General-Purpose Embedded Controller
The PIC32MX420F032H-40I/PT serves as a general-purpose 32-bit embedded controller in cost-sensitive applications where 32-bit performance is needed but a full PIC32MX7xx part is over-spec. The 40 MHz M4K core delivers 62 DMIPS peak for state-machine control, and 32 KB Flash / 8 KB RAM fit typical control loops with logging. Two UARTs support field-bus or RS-485 interfaces, and the 10-bit ADC reads analog sensors. The TQFP-64 package provides generous GPIO for parallel control applications, per the PIC32MX3XX/4XX family datasheet.
Recommended
USB Bootloader and Field-Upgradable Nodes
The PIC32MX420F032H-40I/PT supports Microchip's USB bootloader architecture, allowing field firmware upgrades via USB without an external programmer. The 32 KB Flash is partitioned to fit a small USB HID bootloader plus application image. The PIC32MX3XX/4XX family datasheet documents the standard bootloader entry-point and row-write Flash endurance, suitable for industrial nodes requiring periodic firmware updates over the USB connection.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX420F032H-40I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX420F032H-40V/PT | PIC32MX420F032HT-40I/PT | PIC32MX320F064H-40I/PT | PIC32MX320F032H-40I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Core | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | |
| Max CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 80 MHz | |
| Flash | 32 KB | 32 KB | 64 KB | 32 KB | |
| RAM | 8 KB | 8 KB | 16 KB | 8 KB | |
| USB | USB-OTG FS | USB-OTG FS | USB-OTG FS | USB-OTG FS | |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +105C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- Lowest-cost 32 KB Flash 64-pin TQFP PIC32MX4XX variant (vs PIC32MX320F064H-40I/PT)
- Industrial temperature grade drop-in for -40C to +85C (vs PIC32MX420F032H-40V/PT)
- On-chip USB-OTG full-speed PHY eliminates external transceiver (vs External-USB MCU designs (e.g. PIC16 + FTDI bridge))
Design Notes
Route the USB D+ and D- lines as a 90-ohm differential pair with matched trace lengths, keep them short (<50 mm) and isolated from switching signals, and place a common-mode choke close to the connector. Place a 0.1uF decoupling cap on VUSB per the PIC32MX3XX/4XX family datasheet. Decoupling: place 0.1uF and 1uF ceramic caps on every VDD/VSS pair within 3 mm of the pin.
The TQFP-64 package has a thermal pad beneath the die connected to VSS; connect this pad to a large ground copper pour with at least 4 thermal vias to the inner ground plane to dissipate the maximum 0.6 W at 40 MHz. Use 4-layer PCB with dedicated ground and power planes to keep switching noise below 50 mV on VDD, per the PIC32MX3XX/4XX family datasheet.
Do not leave PGECx/PGEDx floating - these ICSP pins must be pulled or routed to a programming header. When using the on-chip USB PHY, the VUSB pin requires its own 3.3 V regulator output (do not connect directly to VDD if USB bus-powered designs exceed 100 mA). For USB suspend current compliance, add the 32.768 kHz secondary crystal circuit, per the PIC32MX3XX/4XX family datasheet.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; this part is general-purpose/USB, not automotive-grade. Halogen-free status not specified in verified data.
