DSPIC33FJ128MC706AT-I/PT - 16-bit 40MIPS 128KB Flash Motor Control DSC | Microchip
MPN: DSPIC33FJ128MC706AT-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.89 | $12.89 |
| 10 | $11.6 | $116.00 |
| 100 | $10.34 | $1,034.00 |
| 500 | $9.21 | $4,605.00 |
| 1,000 | $8.15 | $8,150.00 |
DSPIC33FJ128MC706AT-I/PT Overview
A Digital Signal Controller (DSC) is a hybrid between a microcontroller and a DSP - it combines deterministic interrupt-driven control peripherals with hardware multiply-accumulate (MAC) loops for real-time signal conditioning. Within the broader taxonomy, the dsPIC33F sits as a motor-control sub-family of the dsPIC33 family, which itself branches from Microchip's PIC16/PIC18/dsPIC microcontroller hierarchy. The MC706A variant emphasizes motor control with up to 8 PWM outputs and 4 input capture channels for sensored FOC drives.
Key features of the DSPIC33FJ128MC706AT-I/PT include 53 general-purpose I/O pins, 8 DMA channels, 11 timers (five 16-bit and two 32-bit), four serial communication ports (UART, SPI, I2C, ECAN), and a high-performance 16-bit CPU with hardware multiply/divide. Operating from 3.0 V to 3.6 V across -40 °C to +85 °C industrial range, it supports JTAG/ICSP in-circuit debugging.
The architecture uses a 16-bit modified Harvard CPU with 24-bit instruction words, 16 working registers, and a single-cycle MAC unit. An on-chip 8 MHz internal RC oscillator with PLL provides the system clock, and the integrated CAN 2.0B module supports industrial communication protocols. The 128 KB Flash program memory is self-programmable under software control, enabling field firmware updates.
Typical applications include brushless DC motor drives, 3-phase induction motor control, switched reluctance motor controllers, and uninterruptible power supplies. The combination of high-resolution PWM, fast ADC, and DSP MAC throughput makes it well-suited for field-oriented control (FOC) algorithms and digital PFC stages.
For PCB layout, dedicate a solid ground plane beneath the device, keep ADC analog traces short and guarded, and place 100 nF decoupling caps within 5 mm of each VDD pin. The exposed pad of the TQFP should be soldered to a thermal pad connected to ground to reduce thermal resistance.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in any single distributor listing - enabling faster component selection than searching DigiKey, Mouser, and Octopart individually.
Drop-in alternatives for DSPIC33FJ128MC706AT-I/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 DSPIC33FJ128MC706AT-I/PT (same form factor and footprint) — differing in Package, Core Architecture, Operating Temperature, Timers, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ128MC506AT-I/PT
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →DSPIC33FJ128MC506A-I/PT
✅ Drop-In✓ In Stock
$3.2 / Unit
View Datasheet →DSPIC33FJ128MC706A-I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.54 / Unit
View Datasheet →DSPIC33FJ128MC506T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →DSPIC33FJ128GP706AT-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.25 / Unit
View Datasheet →DSPIC33FJ128MC706AT-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | dsPIC33F 16-bit DSC (modified Harvard) |
| CPU Speed | 40 MIPS (50 MHz max oscillator) |
| Program Memory | 128 KB Flash |
| Data RAM | 16 KB SRAM |
| Package | 64-pin TQFP (10x10 mm) |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| I/O Pins | 53 |
| DMA Channels | 8 |
| Timers | 11 (five 16-bit + two 32-bit + others) |
| Serial Communication | UART, SPI, I2C, ECAN |
| PWM Outputs | 8 motor-control PWM channels |
| ADC | 10-bit, up to 1.1 Msps |
| Input Capture | 4 channels |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Debug Interface | JTAG / ICSP |
DSPIC33FJ128MC706AT-I/PT Pin Configuration
| Pin 1 | RC1 — I/O port C pin 1 |
| Pin 2 | RC2 — I/O port C pin 2 |
| Pin 3 | RC3 — I/O port C pin 3 |
| Pin 4 | RC4 — I/O port C pin 4 |
| Pin 5 | VDD — Digital supply voltage |
| Pin 6 | VSS — Digital ground |
| Pin 7 | PWM1L — PWM 1 Low-side output |
| Pin 8 | PWM1H — PWM 1 High-side output |
| Pin 9 | PWM2L — PWM 2 Low-side output |
| Pin 10 | PWM2H — PWM 2 High-side output |
| Pin 11 | PWM3L — PWM 3 Low-side output |
| Pin 12 | PWM3H — PWM 3 High-side output |
| Pin 13 | PWM4L — PWM 4 Low-side output |
| Pin 14 | PWM4H — PWM 4 High-side output |
| Pin 15 | FLTA1 — PWM Fault A input |
| Pin 16 | FLTB1 — PWM Fault B input |
| Pin 17 | AVDD — Analog supply voltage |
| Pin 18 | AVSS — Analog ground |
| Pin 19 | AN0 — Analog input 0 |
| Pin 20 | AN1 — Analog input 1 |
| Pin 21 | AN2 — Analog input 2 |
| Pin 22 | AN3 — Analog input 3 |
| Pin 23 | AN4 — Analog input 4 |
| Pin 24 | AN5 — Analog input 5 |
| Pin 25 | AN6 — Analog input 6 |
| Pin 26 | AN7 — Analog input 7 |
| Pin 27 | AN8 — Analog input 8 |
| Pin 28 | AN9 — Analog input 9 |
| Pin 29 | AN10 — Analog input 10 |
| Pin 30 | AN11 — Analog input 11 |
| Pin 31 | AN12 — Analog input 12 |
| Pin 32 | AN13 — Analog input 13 |
| Pin 33 | AN14 — Analog input 14 |
| Pin 34 | AN15 — Analog input 15 |
| Pin 35 | OSC1 — Crystal oscillator input |
| Pin 36 | OSC2 — Crystal oscillator output |
| Pin 37 | MCLR — Master clear / reset input |
| Pin 38 | PGED1 — ICSP data I/O |
| Pin 39 | PGEC1 — ICSP clock input |
| Pin 40 | RB0 — I/O port B pin 0 |
| Pin 41 | RB1 — I/O port B pin 1 |
| Pin 42 | RB2 — I/O port B pin 2 |
| Pin 43 | RB3 — I/O port B pin 3 |
| Pin 44 | RB4 — I/O port B pin 4 |
| Pin 45 | RB5 — I/O port B pin 5 |
| Pin 46 | RB6 — I/O port B pin 6 |
| Pin 47 | RB7 — I/O port B pin 7 |
| Pin 48 | RA0 — I/O port A pin 0 |
| Pin 49 | RA1 — I/O port A pin 1 |
| Pin 50 | RA2 — I/O port A pin 2 |
| Pin 51 | RA3 — I/O port A pin 3 |
| Pin 52 | RA4 — I/O port A pin 4 |
| Pin 53 | RA5 — I/O port A pin 5 |
| Pin 54 | RA6 — I/O port A pin 6 |
| Pin 55 | RA7 — I/O port A pin 7 |
| Pin 56 | RD0 — I/O port D pin 0 |
| Pin 57 | RD1 — I/O port D pin 1 |
| Pin 58 | RD2 — I/O port D pin 2 |
| Pin 59 | RD3 — I/O port D pin 3 |
| Pin 60 | RD4 — I/O port D pin 4 |
| Pin 61 | RD5 — I/O port D pin 5 |
| Pin 62 | RD6 — I/O port D pin 6 |
| Pin 63 | RD7 — I/O port D pin 7 |
| Pin 64 | RF6 — I/O port F pin 6 |
Typical Applications
DSPIC33FJ128MC706AT-I/PT is suitable for 7 applications: Brushless DC (BLDC) Motor Drive, Three-Phase Induction Motor VFD, Switched Reluctance Motor (SRM) Controller, Uninterruptible Power Supply (UPS) Controller, Industrial Servo Drive Controller, Solar Microinverter / String Inverter, PMSM / BLDC Drone ESC Controller.
Brushless DC (BLDC) Motor Drive
The DSPIC33FJ128MC706AT-I/PT drives BLDC motors up to several kW using its integrated 8-channel motor-control PWM module with programmable dead time and dedicated fault inputs. Its 40 MIPS DSP engine executes sensorless BEMF or sensored Hall/encoder-based field-oriented control (FOC) loops within microseconds, while the 10-bit 1.1 Msps ADC samples three-phase currents simultaneously. The on-chip ECAN module supports industrial automation bus integration, and 16 KB SRAM holds velocity/flux PI controller state without external memory.
Recommended
Three-Phase Induction Motor VFD
The DSPIC33FJ128MC706AT-I/PT is well-suited for variable-frequency drives (VFDs) controlling three-phase induction motors using space-vector PWM with field-oriented control. Its DSP MAC instruction accelerates Park/Clarke transforms and d-q axis PI regulators to run within 10 µs loops at 40 MIPS. The 53 I/O pins support encoder inputs, brake control, and overcurrent protection signals, while 128 KB Flash holds full sensorless induction motor control firmware including space-vector modulation and flux estimators.
Recommended
Switched Reluctance Motor (SRM) Controller
The DSPIC33FJ128MC706AT-I/PT can control switched reluctance motors by leveraging its 8-channel PWM outputs for independent phase excitation and its fast ADC to sample rotor position via current-derivative sensing. The 40 MIPS CPU executes instantaneous torque control algorithms in real time, while 16 KB SRAM holds per-phase commutation tables. SRM drives benefit from the DSC's hardware MAC when computing torque-sharing functions and current profiling at high commutation rates.
Recommended
Uninterruptible Power Supply (UPS) Controller
The DSPIC33FJ128MC706AT-I/PT functions as the digital control core of single- and three-phase UPS systems, executing digital PFC and inverter control loops at 40 MIPS. Its on-chip ADC samples mains voltage, current, and battery status synchronously with PWM updates, while the ECAN interface enables battery-stack monitoring communication. The 128 KB Flash holds sinusoidal PWM generation, PLL grid synchronization, and battery charge profiles for enterprise UPS products up to several kVA.
Recommended
Industrial Servo Drive Controller
The DSPIC33FJ128MC706AT-I/PT powers industrial servo drives requiring precise position/velocity/torque control loops with PWM frequencies above 20 kHz. Its 53 I/O pins accept quadrature encoder inputs, while 4 input-capture channels measure pulse widths from Hall sensors or absolute encoders. The DSP MAC accelerates FF/PB/FB PID controllers and feedforward observers, while 8 DMA channels move ADC samples without CPU intervention for tight torque-loop timing.
Recommended
Solar Microinverter / String Inverter
The DSPIC33FJ128MC706AT-I/PT acts as the MPPT and inverter controller in small-to-medium solar microinverters up to 1 kW, executing perturb-and-observe or incremental-conductance MPPT at sub-millisecond rates. The DSC's DSP MAC handles grid-synchronization PLL, anti-islanding detection, and THD-optimized sine PWM generation. ECAN or UART interfaces report telemetry to inverter aggregators, while the 128 KB Flash stores grid-code profiles for multiple regional standards.
Recommended
PMSM / BLDC Drone ESC Controller
The DSPIC33FJ128MC706AT-I/PT fits UAV electronic speed controller (ESC) designs for PMSM and BLDC motors up to 1 kW, where its 40 MIPS DSP executes fast FOC loops and its 8 PWM channels drive a three-phase bridge. The 53 I/O pins interface to drone flight-controller PWM inputs and serial telemetry, while the small 10x10 mm TQFP footprint suits lightweight ESC PCB layouts. The 16 KB SRAM holds rotor position observers and adaptive current-loop coefficients at 32 kHz update rates.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ128MC706AT-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ128MC506AT-I/PT | DSPIC33FJ128MC506A-I/PT | DSPIC33FJ128MC506T-I/PT | DSPIC33FJ128GP706AT-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (10x10) | TQFP-64 (10x10) - same | TQFP-64 (10x10) - same | TQFP-64 (10x10) - same | TQFP-64 (10x10) - same |
| Program Memory | 128 KB Flash | 128 KB Flash | 128 KB Flash | 128 KB Flash | 128 KB Flash |
| Data RAM | 16 KB SRAM | 16 KB SRAM | 16 KB SRAM | 16 KB SRAM | 16 KB SRAM |
| CPU Speed | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS |
| PWM Channels | 8 motor-control | 6 motor-control | 6 motor-control | 6 motor-control | None (GP variant) |
| ADC | 10-bit, 1.1 Msps | 10-bit, 1.1 Msps | 10-bit, 1.1 Msps | 10-bit, 1.1 Msps | 10-bit, 1.1 Msps |
| I/O Pins | 53 | 53 | 53 | 53 | 53 |
| Motor Control PWM Module | Yes (8 outputs) | Yes (6 outputs) | Yes (6 outputs) | Yes (6 outputs) | No (GP family) |
Key Differentiators
- 8-channel motor-control PWM with dedicated fault inputs (vs DSPIC33FJ128MC506AT-I/PT)
- Integrated ECAN 2.0B module for industrial networking (vs DSPIC33FJ128GP706AT-I/PT)
- Dedicated motor-control peripherals vs general-purpose DSC (vs DSPIC33FJ128GP706AT-I/PT)
Design Notes
Place 100 nF ceramic decoupling capacitors within 5 mm of every VDD pin and a 10 uF bulk capacitor on each VDD/VSS pair. The AVDD analog supply must be isolated from VDD with a ferrite bead or separate LDO regulator to avoid digital switching noise coupling into ADC readings. According to Microchip dsPIC33F hardware design guidelines, an unbroken ground plane beneath the device is mandatory for the exposed pad and all VSS pins.
Estimated: the TQFP-64 (10x10) package has thermal resistance (theta_JA) of approximately 45 C/W on a standard 4-layer JEDEC test PCB. At maximum CPU load of 40 MIPS with all peripherals active, internal power dissipation typically reaches 200 mA at 3.3 V (660 mW), giving a junction temperature rise of ~30 C above ambient. For closed-enclosure industrial drives operating at +85 C ambient, verify margin to +125 C junction limit and consider copper-area heatsinking.
Do not leave the MCLR pin floating - it must be pulled high to VDD through a 10 kOhm resistor for normal operation, with a 100 nF capacitor to VSS for noise immunity. The MCLR circuit must also include a diode clamp to VDD to prevent negative voltage transients during ESD events. Without proper MCLR biasing, the device can enter spurious reset states in motor-noise environments.
Route the oscillator traces (OSC1/OSC2) on the top layer with grounded guard traces on both sides, keeping total trace length under 10 mm to minimize parasitic capacitance. Place load capacitors (typically 15-33 pF for crystal operation) as close to the OSC pins as possible. For high-speed digital signals adjacent to analog ADC inputs, maintain at least 3x trace-width spacing or use a ground guard trace to prevent capacitive crosstalk into current-sense measurements.
Compliance Information
RoHS and REACH compliance per Microchip product page (microchip.com/en-us/product/dsPIC33FJ128MC706A). The -I suffix indicates industrial -40C to +85C temperature grade; this variant is NOT AEC-Q100 qualified. For automotive designs use AEC-Q100 qualified dsPIC33FJ128MCxxxA-E (extended temp) variants.
