PIC32MX320F128L-80V/BG - 80MHz 32-bit MCU 128KB Flash 121-TFBGA | Microchip
MPN: PIC32MX320F128L-80V/BG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.05 | $605.00 |
| 500 | $5.4 | $2,700.00 |
| 1,000 | $4.85 | $4,850.00 |
PIC32MX320F128L-80V/BG Overview
A 32-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, volatile and non-volatile memory, and programmable peripherals around a high-throughput data path. The PIC32 family uses the MIPS32 M4K instruction set and is positioned above Microchip's 8-bit PIC and 16-bit dsPIC lines, typically appearing in graphical HMI, USB device, and industrial control subsystems where 32-bit arithmetic and large code footprints are required.
Key features of this part include 128 KB single-cycle Flash, 16 KB SRAM with pre-fetch buffer to accelerate sequential execution, a 10-bit 1 Msps ADC with 16 analog inputs, five 16-bit timers/counters, two comparators, two I2C and two SPI buses, two EUSART modules with IrDA support, and a parallel master port for external bus expansion. The device operates from 2.3 V to 3.6 V and is rated -40 C to +105 C for industrial environments.
The PIC32MX320 architecture uses a 5-stage pipeline M4K core with hardware multiply/divide and a single-cycle Flash prefetch module that lets the CPU execute from Flash with near-RAM throughput. Peripheral DMA moves ADC, UART and SPI traffic independently of the core, freeing MIPS for application code and improving real-time determinism in control loops.
Typical applications include USB peripherals and HID devices, industrial HMI panels, motor control front-ends, data loggers, and consumer audio/video accessories that need a USB-OTG-capable 32-bit controller with low BOM cost. The 121-ball TFBGA package targets space-constrained designs where board area is at a premium but routing density is high.
When designing with this part, allocate decoupling caps near every VDD/VSS pin pair and follow the recommended 80 MHz crystal or external clock layout guidelines; the parallel master port pins are multiplexed with I/O and must be tri-stated in software when used as general-purpose I/O to avoid contention. Engineers should also verify that supply ramp meets the 0.1 ms minimum spec to avoid POR issues.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC32MX320F128L-80V/BG — 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 PIC32MX320F128L-80V/BG (same form factor and footprint) — differing in ADC, Package, DMA Channels, Operating Temperature, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F128L-80I/BG
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.25 / Unit
View Datasheet →PIC32MX270F512L-V/PF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.1 / Unit
View Datasheet →PIC32MX270F256L-50I/PF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX170F512L-I/PF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.45 / Unit
View Datasheet →PIC32MX230F128L-50I/PF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.71 / Unit
View Datasheet →PIC32MX320F128L-80V/BG Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Maximum CPU Clock | 80 MHz |
| Program Memory (Flash) | 128 KB |
| Data Memory (SRAM) | 16 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| ADC | 10-bit, up to 16 channels |
| ADC Sample Rate | 1 Msps |
| USB | USB 2.0 Full-Speed OTG |
| UART / EUSART | 2 |
| I2C | 2 |
| SPI | 2 |
| Timers | 5 x 16-bit |
| DMA Channels | Yes |
| Package | 121-ball TFBGA, 10x10 mm |
| Operating Temperature | -40 C to +105 C (Industrial) |
| I/O Pins | 85 (approx.) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC32MX320F128L-80V/BG Pin Configuration
| Pin A1 | TDO — Test data out (JTAG) |
| Pin A11 | SDA1/RA15 — I2C1 data or GPIO RA15 |
| Pin B1 | OSC1/CLKI/RC12 — Crystal oscillator input or external clock |
| Pin B11 | SCL1/RA14 — I2C1 clock or GPIO RA14 |
| Pin C1 | OSC2/CLKO/RC15 — Crystal oscillator output or system clock out |
| Pin C11 | PMD5/RE5 — Parallel master port data or GPIO RE5 |
| Pin D1 | VDD — Digital supply 2.3-3.6 V |
| Pin D11 | PMD6/RE6 — Parallel master port data or GPIO RE6 |
| Pin E1 | VSS — Digital ground |
| Pin E11 | PMD7/RE7 — Parallel master port data or GPIO RE7 |
| Pin F1 | TMS — Test mode select (JTAG) |
| Pin F11 | VDD — Digital supply 2.3-3.6 V |
| Pin G1 | TCK — Test clock (JTAG) |
| Pin G11 | VSS — Digital ground |
| Pin H1 | TDI — Test data in (JTAG) |
| Pin H11 | RD7/PMD11 — GPIO RD7 or PMD11 |
| Pin J1 | AVDD — Analog supply for ADC |
| Pin J11 | RD6/PMD10 — GPIO RD6 or PMD10 |
Typical Applications
PIC32MX320F128L-80V/BG is suitable for 6 applications: USB HID Peripheral Devices, Industrial HMI Control Panels, Motor Control Front-End, USB Data Loggers and Instrumentation, Consumer Audio/Video Accessories, Smart Home and IoT Sensor Hubs.
USB HID Peripheral Devices
The PIC32MX320F128L-80V/BG's integrated USB 2.0 full-speed OTG controller makes it a natural fit for USB HID peripherals such as keyboards, mice, game controllers, custom input panels and industrial handsets. The 80 MHz MIPS M4K core delivers 1.56 DMIPS/MHz, enough headroom for HID class driver plus custom application logic, while the on-chip USB transceiver eliminates external PHY cost. 128 KB Flash comfortably fits Microchip's USB HID stack and application code, and the DMA controller can offload endpoint transfers for deterministic USB latency under heavy CPU load.
Recommended
Industrial HMI Control Panels
Industrial human-machine interface (HMI) panels need a 32-bit MCU to drive graphics controllers, manage touch input and run communication stacks. The PIC32MX320F128L-80V/BG provides 16 KB SRAM, two EUSART (RS-232/485), two I2C (for touch controllers and EEPROM) and a parallel master port to interface with external graphics controllers. Its -40 C to +105 C industrial rating and 16-channel 10-bit ADC at 1 Msps make it suitable for panel-meter and operator interface designs where low BOM cost is critical and USB is used for firmware update or data logging.
Recommended
Motor Control Front-End
Small BLDC or stepper motor controllers benefit from the PIC32MX320F128L-80V/BG's five 16-bit timers, DMA-driven ADC, and 16-channel 10-bit ADC for current/voltage sensing. At 80 MHz, the core can close a 20 kHz PWM control loop while handling UART command processing and SPI encoder feedback in parallel. The 121-TFBGA package minimizes board area in tightly packaged motor drives, and the parallel master port can be used to drive external gate-driver logic for three-phase bridges up to several hundred watts.
Recommended
USB Data Loggers and Instrumentation
Portable data loggers and USB instrumentation benefit from the PIC32MX320F128L-80V/BG's USB 2.0 full-speed OTG for PC connectivity combined with the 16-channel 10-bit ADC sampling at up to 1 Msps. 128 KB Flash accommodates FAT file system plus logger firmware, while 16 KB SRAM holds acquisition buffers. Two SPI and two I2C interfaces let the MCU connect to external sensors (temperature, pressure, accelerometer), and DMA keeps the ADC streaming without CPU intervention, freeing cycles for data compression and USB transfer.
Recommended
Consumer Audio/Video Accessories
USB audio interfaces, MIDI controllers and consumer AV accessories are a classic fit for the PIC32MX320F128L-80V/BG. The 80 MHz M4K core can handle USB isochronous audio at 48 kHz/24-bit while the I2S-style peripherals (driven by SPI) interface to external codecs. The 121-TFBGA package enables slim product enclosures where 10x10 mm is acceptable, and 128 KB Flash is enough for a USB audio class driver plus DSP-style audio mixing firmware. DMA ensures glitch-free audio streaming under system load.
Recommended
Smart Home and IoT Sensor Hubs
Smart-home bridges and IoT sensor hubs require a USB-connected controller to aggregate wireless sensor data via SPI/ZigBee modules and expose it to a host PC. The PIC32MX320F128L-80V/BG's USB OTG enables device or host mode, two SPI buses can connect to wireless transceivers like the MRF24WG0MA or RN-171 Wi-Fi modules, and the 16-channel ADC reads analog sensors. Industrial temperature rating and 5 timers suit outdoor or uncontrolled-environment installations. Drop-in migration to PIC32MX270F512L is straightforward when more memory is needed.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F128L-80V/BG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX270F512L-V/PF | PIC32MX170F512L-I/PF | PIC32MX230F128L-50I/PF | PIC32MX270F256L-50I/PF |
|---|---|---|---|---|---|
| Package | 121-TFBGA (10x10 mm) | 121-TFBGA (10x10 mm) - same | 121-TFBGA (10x10 mm) - same | 121-TFBGA (10x10 mm) - same | 121-TFBGA (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Clock | 80 MHz | 80 MHz (same) | 50 MHz (-37.5%) | 50 MHz (-37.5%) | 50 MHz (-37.5%) |
| Flash | 128 KB | 512 KB (+300%) | 512 KB (+300%) | 128 KB (same) | 256 KB (+100%) |
| SRAM | 16 KB | 128 KB (+700%) | 128 KB (+700%) | 16 KB (same) | 64 KB (+300%) |
| USB | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
| ADC | 10-bit, 16-ch, 1 Msps | 10-bit, 28-ch, 1 Msps | 10-bit, 28-ch, 1 Msps | 10-bit, 13-ch, 1 Msps | 10-bit, 28-ch, 1 Msps |
| Operating Voltage | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V | 2.3-3.6 V |
| 1-piece Price (USD, est.) | 7.85 | 8.10 | 6.95 | 6.20 | 7.05 |
Key Differentiators
- Highest CPU performance in 121-TFBGA footprint at this price point (vs PIC32MX230F128L-50I/PF)
- USB 2.0 OTG full-speed on-chip (Host + Device) (vs PIC32MX170F512L-I/PF)
- Established production status and broad design resources (vs PIC32MX270F512L-V/PF)
Design Notes
The 121-ball TFBGA has 0.8 mm ball pitch and requires NSMD (non-solder mask defined) pads with via-in-pad recommended for ground and signal escape. Per Microchip AN447 'PCB Design Considerations', use a 4-layer stack-up with continuous ground plane beneath the BGA and 100 uF + 0.1 uF decoupling per VDD/VSS pair within 2 mm of the ball. Route USB DP/DM as a 90-ohm differential pair with length matching to within 150 mil. Plan thermal vias under the center balls to improve heat dissipation for high-speed designs.
Provide a clean 3.3 V rail capable of at least 100 mA peak during USB transmissions. Add a ferrite bead in series with the USB VBUS sense pin to suppress inrush transients. AVDD and AGND must be tied to the same supply as VDD/VSS with separate pi-filter (10 ohm + 10 uF) for the ADC reference, and AVSS must connect to the same ground via a star ground. Brown-out reset (BOR) should remain enabled at the lowest threshold (2.30 V) to avoid POR glitches during USB cable insertion events.
Do not exceed the 3.6 V absolute maximum on any I/O or supply pin - the PIC32MX320 is a 3.3 V part despite operating from 2.3 V. Configure all unused I/O as outputs driving low to minimize current draw and EMI. Avoid routing the parallel master port signals over the analog ground reference plane - they should be confined to the digital section. Always assert MCLR through a 10 kohm pull-up to VDD; leaving MCLR floating causes intermittent POR resets. When using the ADC, take 10 uS settling time between channel switches to maintain 10-bit accuracy.
Keep the 80 MHz crystal traces short (less than 5 mm) and symmetric. Place load capacitors within 2 mm of OSC1/OSC2 balls with the ground side returning directly to the nearest package ground. Route JTAG TCK/TMS/TDI/TDO as a bus away from high-speed USB and PWM signals to prevent in-circuit debug from being disrupted by EMI. Add 10 kohm pull-ups on SDA1/SCL1 if used as I2C bus controllers - the PIC32MX320 includes weak pull-ups but they may be insufficient above 400 kHz.
Compliance Information
RoHS compliant Pb-free matte-tin plating per Microchip product page. Industrial -40C to +105C temperature grade; not AEC-Q100 qualified - choose AEC-Q100 variants for automotive.
