PIC24FJ32MC102-I/SO - 16-bit 32KB Flash Motor Control MCU | Microchip
MPN: PIC24FJ32MC102-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.18 | $318.00 |
| 500 | $2.85 | $1,425.00 |
| 1,000 | $2.54 | $2,540.00 |
PIC24FJ32MC102-I/SO Overview
An MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (RAM), and peripheral subsystems such as timers, ADC, communication controllers and PWM blocks. In the broader taxonomy, the PIC24FJ32MC102 sits as a 16-bit MCU -> 16-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. Motor-control variants specifically target the precise PWM generation and analog sampling required for BLDC, PMSM, and DC brushed/brushless drives.
Key features include 16 MIPS CPU throughput at 32 MHz, dedicated motor-control PWMs, an integrated 10-bit ADC, CTMU for touch or capacitive sensing, and PPS for flexible peripheral-to-pin mapping. The 32 KB self-programmable Flash and 2 KB RAM support small to medium control loops, while the 28-pin SOIC provides a generous pin budget for analog, communication, and PWM signals without resorting to smaller QFN footprints.
Architecturally, the PIC24FJ32MC102 uses Microchip's modified Harvard architecture with a 16-bit data path, hardware multiplier/divider, and a 16-element working register array. The motor-control peripherals operate independently of the CPU, freeing MIPS for state-machine or communications tasks. PPS allows remapping of digital peripherals, reducing pin-out constraints on compact motor boards.
Typical applications include low-voltage BLDC/PMSM motors, sensorless and Hall-sensor fan control, drone ESCs, e-bike and small EV traction control, robotic joint drives, white-goods motor control (washing-machine direct-drive pumps), and low-cost industrial servo drives. Industrial factory automation and HVAC actuators also use this family for compact closed-loop current/voltage regulation.
When designing with this MCU, ensure the VDD/AVDD pair is properly decoupled and the 32 kHz secondary oscillator is configured for low-power modes. The MCPWM module's fault inputs and dead-time generators should be validated against the motor driver's safe-commutation requirements.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, enabling faster sourcing and PCB layout reuse decisions.
Drop-in alternatives for PIC24FJ32MC102-I/SO — 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 PIC24FJ32MC102-I/SO (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Core, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ32MC102-E/SO
✅ Drop-In✓ In Stock
$2.4 / Unit
View Datasheet →PIC24FJ32MC102-I/SP
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →PIC24FJ32MC102-I/SS
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC24FJ32MC101-I/SO
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC24FJ32MC101-E/SO
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC24FJ32MC102-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC24F 16-bit |
| CPU Performance | 16 MIPS |
| Program Memory (Flash) | 32 KB (11K x 24) |
| RAM | 2 KB |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| Package | 28-SOIC (0.3 inch) |
| Mounting Type | Surface Mount |
| Motor Control PWM (MCPWM) | Yes (with fault inputs, dead-time) |
| CTMU | Yes (Charge Time Measurement Unit) |
| PPS (Peripheral Pin Select) | Yes |
| RoHS Status | Compliant |
| MSL Level | 1 (Unlimited) |
| Lead-Free | Yes |
| Product Family | PIC24FJ32MC10x motor-control MCU family |
| Data Sheet Family | PIC24FJ16MC101/102 and PIC24FJ32MC101/102/104 |
PIC24FJ32MC102-I/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| Pin 2 | OSC1 — Oscillator input or external clock input |
| Pin 3 | OSC2 — Oscillator output |
| Pin 4 | PWM1L — PWM output 1, low-side |
| Pin 5 | PWM1H — PWM output 1, high-side |
| Pin 6 | PWM2L — PWM output 2, low-side |
| Pin 7 | PWM2H — PWM output 2, high-side |
| Pin 8 | PWM3L — PWM output 3, low-side |
| Pin 9 | PWM3H — PWM output 3, high-side |
| Pin 10 | RB0 — I/O port B bit 0 (PPS-capable) |
| Pin 11 | RB1 — I/O port B bit 1 (PPS-capable) |
| Pin 12 | RB2 — I/O port B bit 2 (PPS-capable) |
| Pin 13 | RB3 — I/O port B bit 3 (PPS-capable) |
| Pin 14 | RB4 — I/O port B bit 4 (PPS-capable) |
| Pin 15 | RB5 — I/O port B bit 5 (PPS-capable) |
| Pin 16 | RB6 — I/O port B bit 6 (PPS-capable, ICD PGEC1) |
| Pin 17 | RB7 — I/O port B bit 7 (PPS-capable, ICD PGED1) |
| Pin 18 | RB8 — I/O port B bit 8 (PPS-capable) |
| Pin 19 | RB9 — I/O port B bit 9 (PPS-capable) |
| Pin 20 | VDD — Digital supply voltage (3.0-3.6 V) |
| Pin 21 | VSS — Digital ground |
| Pin 22 | RC0 — I/O port C bit 0 (PPS-capable) |
| Pin 23 | RC1 — I/O port C bit 1 (PPS-capable) |
| Pin 24 | RC2 — I/O port C bit 2 (PPS-capable) |
| Pin 25 | RC3 — I/O port C bit 3 (PPS-capable) |
| Pin 26 | RC4 — I/O port C bit 4 (PPS-capable) |
| Pin 27 | AVSS — Analog ground (tie to VSS) |
| Pin 28 | AVDD — Analog supply voltage (3.0-3.6 V, tie to VDD) |
Typical Applications
PIC24FJ32MC102-I/SO is suitable for 6 applications: BLDC Fan and Pump Motor Control, PMSM FOC Servo and Drone ESC, White Goods Appliance Motor Drives, Robotics Joint and Actuator Control, HVAC and Building Automation Fan Control, Low-Cost Industrial Servo and Stepper Replacement.
BLDC Fan and Pump Motor Control
The PIC24FJ32MC102-I/SO is purpose-built for sensorless and Hall-sensor BLDC fans and pumps up to 200 W. The 16 MIPS core executes sensorless BEMF zero-cross detection algorithms while the MCPWM module generates complementary 6-step or sinusoidal drive waveforms with programmable dead-time, eliminating shoot-through risk in three-phase inverter stages such as those built around DRV8313 or IRS2003 gate drivers. The CTMU block provides precise timing for BEMF sample windows, and PPS allows the comparator and ADC inputs to be routed to any pin, simplifying compact fan PCB layouts. With 32 KB Flash and 2 KB RAM, the device fits complete 6-step commutation, soft-start ramps, RPM closed-loop PI control, and UART-based command interfaces (Modbus RTU, BACnet) within budget. Industrial-grade -40C to +85C operation covers outdoor and appliance environments.
Recommended
PMSM FOC Servo and Drone ESC
For PMSM servo drives and electronic speed controllers (ESCs) in drones and e-bikes, the PIC24FJ32MC102-I/SO delivers field-oriented control (FOC) on small three-phase motors up to 300 W. The 16 MIPS throughput sustains Clarke/Park transforms and PI current loops at 20 kHz PWM frequency when paired with the MCPWM hardware fault inputs and dead-time generators. The 10-bit ADC samples phase currents through integrated current-sense amplifiers, while CTMU timing improves ADC-trigger synchronization for low-jitter sampling. PPS routes PWM outputs and quadrature encoder inputs to free pins, accommodating small 4-layer drone-ESC PCBs. Flash holds a full FOC library (AN1078 sensorless FOC), plus telemetry over UART/SPI for flight controller feedback. Industrial -40C to +85C ensures reliable outdoor drone operation.
Recommended
White Goods Appliance Motor Drives
Washing-machine direct-drive pumps, dishwasher circulation pumps, and refrigerator inverter compressors benefit from the PIC24FJ32MC102-I/SO's low BOM cost and integrated motor-control peripherals. The MCPWM with complementary outputs and dead-time control drives discrete IGBT or MOSFET half-bridges directly through gate drivers such as IR2104 or FAN7888. CTMU and 10-bit ADC handle motor speed feedback via Hall sensors or sensorless BEMF, while PPS allows the same firmware to support both 3-phase PMSM and 1-phase BLDC topologies. 32 KB Flash accommodates fault handling, soft-start, brown-out recovery, and UART-modulated appliance-bus interfaces. Industrial temperature range ensures reliable operation in hot, humid laundry-room environments.
Recommended
Robotics Joint and Actuator Control
Small robotic arms, CNC axis drivers, and collaborative-robot joint controllers use the PIC24FJ32MC102-I/SO to drive brushless or brushed DC motors with encoder feedback. The 16 MIPS core handles cascaded position/velocity/current control loops, while the MCPWM generates the precise PWM required for torque-ripple reduction. PPS routes quadrature encoder inputs, UART for CAN-bridge modules, and SPI for absolute encoder feedback to spare pins, allowing dense PCB layouts. CTMU enables touch-panel HMI or limit-switch timing. With 32 KB Flash, the MCU can run proprietary motion profiles or simple trapezoidal/S-curve trajectories. The industrial -40C to +85C rating suits indoor industrial cells.
Recommended
HVAC and Building Automation Fan Control
Building HVAC fans, variable-air-volume (VAV) controllers, and damper actuators rely on the PIC24FJ32MC102-I/SO for quiet, efficient BLDC or shaded-pole motor control. The MCPWM module with complementary outputs drives three-phase inverter stages for ECM (electronically commutated) motors used in modern high-efficiency fans. The integrated 10-bit ADC monitors temperature, humidity, and current, while CTMU supports capacitive user-input buttons. 32 KB Flash fits BACnet MS-TP or Modbus RTU communication stacks for building-management integration. PPS allows UART, SPI, and PWM peripherals to share pins, simplifying multi-sensor fan boards. Industrial temperature grade covers rooftop and mechanical-room installations.
Recommended
Low-Cost Industrial Servo and Stepper Replacement
The PIC24FJ32MC102-I/SO replaces analog servo amplifiers or stepper drives in cost-sensitive industrial position-control applications such as valve actuators, damper controls, and small linear stages. The 16 MIPS core sustains PID position loops while MCPWM generates precise direction/enable/step pulses or complementary PWM for H-bridge servo drivers. CTMU supports limit-switch debouncing and touch-panel commissioning interfaces. PPS frees the designer from rigid pin assignments, allowing PCBs to be reused across different motor types. 32 KB Flash holds calibration tables, fault logs, and Modbus command interpreters. The -40C to +85C industrial rating supports factory-floor environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ32MC102-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ32MC102-E/SO | PIC24FJ32MC102-I/SP | PIC24FJ32MC102-I/SS | PIC24FJ32MC101-I/SO | PIC24FJ32MC101-E/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same SPDIP | 28-SOIC - same SSOP body | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC24F 16-bit | PIC24F 16-bit | PIC24F 16-bit | PIC24F 16-bit | PIC24F 16-bit | PIC24F 16-bit |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 16 KB (-50%) |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| CPU Performance | 16 MIPS | 16 MIPS | 16 MIPS | 16 MIPS | 16 MIPS | 16 MIPS |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| MCPWM Module | Yes (3 pairs, fault + dead-time) | Yes (3 pairs, fault + dead-time) | Yes (3 pairs, fault + dead-time) | Yes (3 pairs, fault + dead-time) | Yes (3 pairs, fault + dead-time) | Yes (3 pairs, fault + dead-time) |
| Approx. Unit Price @ qty 100 (USD, as of 2026-09-30) | 3.18 | 3.45 (+8%) | 3.30 (+4%) | 3.25 (+2%) | 2.95 (-7%) | 3.18 (0%) |
Key Differentiators
- Extended temperature grade in same 28-SOIC package (vs PIC24FJ32MC102-E/SO)
- Same die in SPDIP package for through-hole designs (vs PIC24FJ32MC102-I/SP)
- Lower cost with 16 KB Flash for memory-tight applications (vs PIC24FJ32MC101-I/SO)
Design Notes
Decouple VDD and AVDD with a 100 nF ceramic capacitor placed within 5 mm of each supply pin. A bulk 10 uF ceramic or tantalum capacitor near the MCU bulk capacitor rail reduces PWM switching noise that can couple into the analog supply. Tie AVDD to VDD and AVSS to VSS with a ferrite bead or short trace; star-ground topology is recommended for mixed-signal motor boards to avoid digital switching noise on ADC inputs. Per the Microchip family datasheet, the MCU does not include an internal regulator, so external 3.3 V LDO regulation is mandatory.
Route PWM traces as short, matched-length pairs to minimize gate-driver timing skew. Keep high-current motor traces (battery return, FET drains) physically separated from low-current analog traces (current-shunt feedback, BEMF dividers). Place the current-shunt amplifier within 10 mm of the low-side FET source; 1 oz copper is sufficient for shunt pads rated <20 A. A solid ground plane beneath the SOIC footprint improves thermal dissipation and EMI. Reserve the ICSP pins (PGEC1/PGED1, alternate on RB6/RB7) for in-circuit debugging pads - do NOT route them to signal traces.
Do not exceed 3.6 V on any VDD/AVDD pin; the PIC24FJ32MC102 lacks 5 V tolerance on most I/O and absolute-maximum is 3.6 V (per Microchip family datasheet). Configure unused I/O as outputs (not inputs) to avoid floating-pin current draw. Configure the FWDT (watchdog timer) for a reasonable 1-4 second timeout in safety-critical motor applications. Always set the FAIL-SAFE Clock Monitor (FCKSM) bit to enable clock-failure detection in motor-control firmware. When migrating between MC101 and MC102, update the Flash linker script to fit the larger memory map.
Estimated: at 32 MHz CPU clock with PWM frequency 20 kHz and 3-pair complementary outputs, peak switching currents on the SOIC VDD pins can reach 80 mA per pin transition. Place 100 nF + 10 nF ceramic decoupling close to each VDD/AVSS pair and a 1 uF bulk near the package. Use a 4-layer PCB with continuous ground plane to keep switching-noise below 50 mVpp on AVDD. If BEMF sensing is used, add a 1 kHz-100 kHz RC low-pass on the comparator input to filter PWM-edge ringing. Always sample BEMF in the PWM off-time center to maximize signal-to-noise ratio.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-I) is not AEC-Q100 qualified; for automotive applications use PIC24F family automotive-grade variants. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020.
