PIC32MX120F032B-V/SS - 32-bit MCU 40MHz 32KB Flash | Microchip
MPN: PIC32MX120F032B-V/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.18 | $5.18 |
| 10 | $4.66 | $46.60 |
| 100 | $4.14 | $414.00 |
| 500 | $3.72 | $1,860.00 |
| 1,000 | $3.32 | $3,320.00 |
PIC32MX120F032B-V/SS Overview
A 32-bit microcontroller (MCU) is a single-chip processor that combines a CPU core, program memory, data memory, and a rich set of on-chip peripherals. The PIC32MX1xx/2xx family sits within the broader PIC32 architecture, which Microchip positions between 8-bit PIC MCUs and 32-bit ARM Cortex-M parts. Within the system hierarchy, the PIC32MX is a general-purpose microcontroller used in embedded control, sensor interfacing, and low-power connectivity. It is widely deployed in automotive body and HVAC modules, consumer appliances, and industrial control panels.
Key features include less than 0.5 mA/MHz active current consumption, two I2S/SPI modules for audio codec and serial communications, Peripheral Pin Select (PPS) for flexible pin mapping, a Parallel Master Port (PMP) for graphics and external memory interfaces, and a Charge Time Measurement Unit (CTMU) for mTouch capacitive touch buttons and sliders. The device also integrates a 10-bit ADC, multiple UART/I2C/SPI peripherals, four DMA channels, and a real-time clock.
The PIC32MX120F032B-V/SS uses a 5-stage pipelined MIPS32 M4K core with hardware multiply/divide, delivering 1.56 DMIPS/MHz performance. Compared to 8-bit PIC MCUs at the same clock, this gives roughly 10x more computational headroom. The combination of PPS, DMA, and CTMU lets a designer reduce external glue logic and keep the BOM compact for cost-sensitive applications.
Typical applications include automotive HVAC and body controllers, capacitive touch user interfaces, low-cost graphical displays via PMP, USB-less audio accessories, and industrial sensor nodes. The AEC-Q100 qualification also makes it a candidate for in-cabin automotive HMI modules and small motor control boards.
When designing with this MCU, plan I/O assignments early to take advantage of Peripheral Pin Select, since most digital peripherals can be remapped to a wide range of pins. The CTMU peripheral requires careful calibration of the constant-current source and the timing reference for reliable touch detection.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond what is presented in the manufacturer datasheet.
Drop-in alternatives for PIC32MX120F032B-V/SS — 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 PIC32MX120F032B-V/SS (same form factor and footprint) — differing in Package, ADC, Core Architecture, Operating Temperature Range, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX120F032BT-V/SS
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC32MX120F032B-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX120F032BT-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC32MX120F032B-I/SO
✅ Drop-In✓ In Stock
$1.71 / Unit
View Datasheet →PIC32MX120F032BT-50I/SO
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC32MX130F032B-I/SS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC32MX120F032B-V/SS Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit RISC |
| CPU Frequency | 40 MHz |
| Performance | 1.56 DMIPS/MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 8 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| Active Current | < 0.5 mA/MHz |
| Operating Temperature | -40 °C to +105 °C |
| I/O Pins | 21 |
| ADC | 10-bit, 13-channel, 1 Msps |
| Timers | 5 16-bit, 1 32-bit (Input Capture/Output Compare) |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| I2S | 2 |
| DMA Channels | 4 |
| PMP | Yes (8/16-bit Parallel Master Port) |
| CTMU | Yes (Charge Time Measurement Unit) |
| PPS | Yes (Peripheral Pin Select) |
| RTC | Yes |
| Package | 28-pin SSOP (5.30 mm) |
| Mounting Type | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS Status | Compliant |
PIC32MX120F032B-V/SS Pin Configuration
| Pin 1 | RA0/PGED3 — General I/O / Programming data pin 3 |
| Pin 2 | RA1/PGEC3 — General I/O / Programming clock pin 3 |
| Pin 3 | RA2 — General I/O |
| Pin 4 | RA3 — General I/O |
| Pin 5 | RA4 — General I/O |
| Pin 6 | VDD — Positive supply voltage (2.3-3.6 V) |
| Pin 7 | VSS — Ground reference |
| Pin 8 | RB0 — General I/O / Programming pin |
| Pin 9 | RB1 — General I/O |
| Pin 10 | RB2 — General I/O |
| Pin 11 | RB3 — General I/O |
| Pin 12 | RB4 — General I/O |
| Pin 13 | RB5 — General I/O |
| Pin 14 | RB6 — General I/O |
| Pin 15 | RB7 — General I/O |
| Pin 16 | RB8 — General I/O |
| Pin 17 | RB9 — General I/O |
| Pin 18 | RB10 — General I/O |
| Pin 19 | RB11 — General I/O |
| Pin 20 | RB12 — General I/O |
| Pin 21 | RB13 — General I/O |
| Pin 22 | RB14 — General I/O |
| Pin 23 | RB15 — General I/O |
| Pin 24 | RC0 — General I/O |
| Pin 25 | RC1 — General I/O |
| Pin 26 | RC2 — General I/O |
| Pin 27 | RC3 — General I/O |
| Pin 28 | RC4 — General I/O |
Typical Applications
PIC32MX120F032B-V/SS is suitable for 6 applications: Automotive HVAC and Body Control Modules, Capacitive Touch User Interfaces (mTouch), Low-Cost Graphical Display with PMP, Industrial Sensor Nodes and PLCs, Consumer Audio Accessories (USB-less), Small Motor Control and PWM Drives.
Automotive HVAC and Body Control Modules
The PIC32MX120F032B-V/SS is well suited to automotive HVAC and body control ECUs where its AEC-Q100 qualification and -40C to +105C temperature range meet in-cabin reliability requirements. Its 32 KB Flash and 8 KB SRAM fit typical HVAC control firmware including blower speed control, mode selection, and CAN-style message handling. The CTMU enables capacitive touch panels for climate controls without extra ICs, while the PMP can drive a small segment LCD for the climate display. The 40 MHz MIPS32 M4K core gives responsive thermal-loop updates without taxing the timing budget.
Recommended
Capacitive Touch User Interfaces (mTouch)
The integrated CTMU peripheral makes the PIC32MX120F032B-V/SS a strong fit for mTouch capacitive touch buttons and sliders used in appliance and industrial HMI panels. The CTMU generates a precise constant current that measures button capacitance at sub-microsecond resolution, allowing 10-20 touch channels with the 28-SSOP's 21 I/O pins. Designers can implement waterproof and glove-friendly interfaces by adjusting threshold timing in firmware. Power consumption stays below 0.5 mA/MHz, enabling battery-backed touch panels.
Recommended
Low-Cost Graphical Display with PMP
The PIC32MX120F032B-V/SS's Parallel Master Port (PMP) lets it drive small QVGA graphical LCDs and OLED displays without an external graphics controller, reducing BOM cost and board area. The 40 MHz core and 8 KB SRAM support framebuffer rendering for 320x240 monochrome displays or smaller color panels. The two I2S/SPI peripherals and DMA channels offload display refresh, freeing the CPU for application logic. This is ideal for industrial gauges, medical handheld UIs, and consumer control panels.
Recommended
Industrial Sensor Nodes and PLCs
With two UART, two SPI, and two I2C peripherals, the PIC32MX120F032B-V/SS acts as a multi-protocol sensor aggregator in industrial PLC and remote-I/O applications. The four DMA channels move sensor data between peripherals and memory without CPU intervention, allowing the 40 MHz core to focus on protocol conversion and edge processing. The 10-bit 1 Msps ADC handles most analog sensor interfaces, while the 5+1 timers deliver PWM outputs for actuator control. The wide 2.3-3.6 V supply tolerates industrial 24 V rails after external regulation.
Recommended
Consumer Audio Accessories (USB-less)
The PIC32MX120F032B-V/SS supports two I2S/SPI modules, which makes it well suited to small audio accessories that interface codecs and DACs without an external USB bridge. Designers can implement SPDIF-to-I2S bridges, headphone amplifiers with digital volume control, or small Bluetooth audio receivers using a UART-connected module. The 8 KB SRAM holds compressed audio buffers, while the 32 KB Flash stores the audio processing firmware. The low active current supports battery-powered speaker products.
Recommended
Small Motor Control and PWM Drives
The five 16-bit timers plus one 32-bit timer in the PIC32MX120F032B-V/SS generate complementary PWM pairs required for small brushless DC and stepper motor control. The Input Capture feature supports encoder feedback for closed-loop speed control, while the Output Compare generates dead-time insertion for half-bridge drivers. The 32 KB Flash holds PID loop code and sensor-fusion firmware for fans, pumps, and small servo drives. Its -40C to +105C temperature range covers underhood and industrial motor environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX120F032B-V/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX120F032BT-V/SS | PIC32MX120F032B-I/SS | PIC32MX120F032BT-I/SS | PIC32MX120F032B-I/SO | PIC32MX120F032BT-50I/SO | PIC32MX130F032B-I/SS |
|---|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) | 28-SOIC (drop-in, wider body) | 28-SOIC (drop-in, wider body) | 28-SSOP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit |
| CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 50 MHz | 50 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| AEC-Q100 | Qualified (automotive) | Qualified | Not qualified (industrial) | Not qualified (industrial) | Not qualified (industrial) | Not qualified (industrial) | Not qualified (industrial) |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C |
Key Differentiators
- AEC-Q100 qualified for automotive in-cabin designs (vs PIC32MX120F032B-I/SS)
- Same 32 KB Flash with 50 MHz core upgrade available (vs PIC32MX130F032B-I/SS)
- CTMU and PMP integrated for touch and graphics (vs PIC32MX110F016B-I/SS)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 6) of the PIC32MX120F032B-V/SS, with a wide ground return to pin 7. For SSOP-28 boards operating above 40 MHz, also add a bulk 10 uF tantalum or ceramic cap near the supply pin to suppress switching transients from the internal core logic. Estimated: a 100 nF X7R 0402 ceramic gives roughly 1 nH series inductance when placed within 2 mm of the pin, which is acceptable for a 40 MHz MCU clock.
The PIC32MX120F032B-V/SS supports Peripheral Pin Select (PPS), which lets you remap most digital peripherals (UART, SPI, I2C, timers) to any digital I/O. Always assign the highest-frequency peripheral (e.g. SPI clock at 25 MHz) to the lowest-capacitance pins and keep trace lengths under 50 mm. Use series damping resistors of 33 ohm on SPI clock and data lines if signal reflections appear on long traces.
Do not confuse the PGED3/PGEC3 programming pins (RA0 and RA1) with general I/O when designing the schematic - they are shared with the in-circuit serial programming interface and must be accessible for field firmware updates. Also, the 50 MHz speed grade variants (PIC32MX120F032BT-50I/SO) operate from -40C to +85C only, not the +105C of the V grade; do not substitute blindly for automotive designs.
The PIC32MX120F032B-V/SS dissipates well under 100 mW in typical 3.3 V / 40 MHz operation, so the 28-SSOP package does not require a heatsink. However, in fully enclosed automotive modules with high ambient temperatures near +105C, verify junction temperature with Microchip's thermal estimator tool. Estimated: with 0.5 mA/MHz active and 25 mA peripheral current, total power is roughly 80 mW at 3.6 V VDD.
Compliance Information
AEC-Q100 qualified with -40C to +105C automotive temperature grade. RoHS compliant per Microchip product page. Lead-free (Pb-free) package. Conflict-mineral reporting available on Microchip website.
