DSPIC33CK128MC105-I/M7 - 16-bit 100MHz DSC, 128KB Flash | Microchip
MPN: DSPIC33CK128MC105-I/M7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.05 | $3.05 |
| 10 | $2.75 | $27.50 |
| 100 | $2.45 | $245.00 |
| 500 | $2.2 | $1,100.00 |
| 1,000 | $1.98 | $1,980.00 |
DSPIC33CK128MC105-I/M7 Overview
A digital signal controller combines the deterministic interrupt latency and peripheral set of a microcontroller (MCU) with the DSP math capability of a digital signal processor. Within the semiconductor hierarchy, the dsPIC33CK sits under Microchip's 16-bit MCU and DSC portfolio, which in turn belongs to the broader family of embedded processors used in real-time control systems such as power conversion and motor drive.
Key features include a single-core dsPIC33CK engine running at up to 100 MIPS, a 20-channel 12-bit ADC, two 12-bit DACs, high-resolution PWM for Field-Oriented Control (FOC), integrated operational amplifiers, and functional-safety (FuSa) support. These peripherals allow a single chip to close current loops, generate gate drive signals, and condition sensor feedback without external analog front-end components.
Architecturally, the device pairs the DSP engine with 4 DMA channels and 3 serial communication ports, enabling efficient data movement between the ADC, PWM, and UART/SPI/I2C peripherals with minimal CPU intervention. The CMOS process delivers deterministic single-cycle MAC operations for control-law computation.
Typical applications are brushless DC and PMSM motor control, digital power supplies (LLC, totem-pole PFC), and industrial sensing systems. The 3.0V to 3.6V supply range matches standard 3.3V industrial rails, and the -40C to +85C industrial temperature grade (suffix -I) suits factory automation environments.
Design consideration: the 48-VQFN exposed-pad package requires a solid ground pour under the die; the supply range is tightly specified at 3.0V to 3.6V, so power-rail tolerance must be managed in the system design.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, with all pricing referenced as of 2026-09-22.
Drop-in alternatives for DSPIC33CK128MC105-I/M7 — 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 DSPIC33CK128MC105-I/M7 (same form factor and footprint) — differing in Package, Core, Functional Safety Support, Temperature Grade.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33CK64MC105-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK256MC105-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK128MC106-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK32MC105-I/M7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33CK128MC105-I/M7 Maximum Ratings & Electrical Characteristics
| Core | dsPIC33CK 16-bit DSC |
| Maximum Operating Frequency | 100 MHz |
| Program Memory (FLASH) | 128KB (128K x 8) |
| Data Memory (RAM) | 16KB |
| Operating Voltage | 3.0 V to 3.6 V |
| Package | 48-VQFN (6x6 mm) |
| General-Purpose I/O | 39 pins |
| ADC Resolution / Channels | 12-bit, 20 channels |
| DAC | Two 12-bit DACs |
| DMA Channels | 4 |
| Serial Ports | 3 |
| Key Peripherals | High-resolution PWM, OpAmps, 12-bit ADC, PWM |
| Functional Safety Support | Yes (FuSa) |
| Temperature Grade | -40C to +85C (industrial, -I suffix) |
| Mounting Type | Surface Mount |
| Process Technology | CMOS |
DSPIC33CK128MC105-I/M7 48-vqfn (6x6 mm) Pin Configuration Guide
Pin configuration for DSPIC33CK128MC105-I/M7 (48-vqfn (6x6 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for DSPIC33CK128MC105-I/M7.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33CK128MC105-I/M7 is suitable for 6 applications: Brushless DC / PMSM Motor Control, Digital Power Supplies (LLC / Totem-Pole PFC), Industrial Automation and Sensing Nodes, Power Tools and Cordless Appliances, LED Lighting and Electronic Ballasts, Telecommunications and Embedded DSP Processing.
Brushless DC / PMSM Motor Control
The DSPIC33CK128MC105-I/M7 is purpose-built for Field-Oriented Control (FOC) of BLDC and PMSM motors. Its 100 MHz (100 MIPS) core closes current loops deterministically, while the high-resolution PWM generates gate-drive signals with fine duty-cycle resolution for low-torque-ripple operation. The 20-channel 12-bit ADC samples phase currents and bus voltage, and the integrated op-amps condition shunt-resistor feedback without an external analog front end, reducing BOM cost. Firmware stored in 128KB FLASH accommodates full FOC plus communication stacks; 16KB RAM buffers ADC results via 4 DMA channels for minimal CPU overhead. The 3.0V-3.6V supply matches standard gate-driver logic levels.
Recommended
Digital Power Supplies (LLC / Totem-Pole PFC)
In digital power conversion, the DSPIC33CK128MC105-I/M7 implements voltage- and current-mode control for LLC resonant converters and totem-pole PFC stages. The high-resolution PWM provides the sub-nanosecond duty-cycle and phase-shift granularity needed for zero-voltage switching, and the 100 MHz core sustains control-loop update rates in the hundreds of kilohertz. The 12-bit ADC with DMA support digitizes output voltage, current, and temperature simultaneously for multi-loop control, while the 12-bit DACs can generate reference or telemetry signals. Dual-loop firmware and protection states (overcurrent, overvoltage) fit comfortably within the 128KB FLASH and 16KB RAM budget.
Recommended
Industrial Automation and Sensing Nodes
For factory automation nodes, the DSPIC33CK128MC105-I/M7 combines DSP capability with three serial ports (UART, SPI, I2C) for PLC communication, sensor fusion, and actuator control on one die. The -40C to +85C industrial temperature grade ensures reliability on the factory floor, and the 48-VQFN (6x6 mm) footprint suits compact distributed I/O modules. Its 39 GPIOs interface switches, encoders, and relays, while the 20-channel 12-bit ADC digitizes analog sensor arrays (pressure, position, current). Deterministic interrupt behavior ensures real-time response for safety interlocks, and functional-safety (FuSa) support from Microchip aids conforming designs.
Recommended
Power Tools and Cordless Appliances
Battery-powered power tools require compact, high-performance motor controllers, and the DSPIC33CK128MC105-I/M7 fits this role: the 48-VQFN (6x6 mm) package minimizes PCB area in the handle-mounted control board, while the 100 MIPS core executes sensorless FOC to maximize torque per battery watt. Integrated op-amps and the 12-bit ADC implement low-cost single-shunt current sensing, and the high-resolution PWM reduces acoustic noise through higher effective PWM frequency. Firmware for startup, stall detection, and protection fits in 128KB FLASH. The 3.3V logic supply derives easily from battery packs via a simple LDO on the tool board.
Recommended
LED Lighting and Electronic Ballasts
High-power LED drivers benefit from the DSPIC33CK128MC105-I/M7's combination of high-resolution PWM (for precise dimming and color mixing without visible flicker) and DSP capability (for power-factor-corrected flyback or buck stages). The 12-bit ADC monitors LED string current and board temperature through NTC inputs across up to 20 channels, enabling per-channel regulation in multi-string luminaires. The 100 MHz core closes control loops for constant-current operation and implements DALI or DMX-style communication over its UART/I2C ports. The two 12-bit DACs can synthesize analog dimming references independent of the PWM engine.
Recommended
Telecommunications and Embedded DSP Processing
Telecom infrastructure boards use the DSPIC33CK128MC105-I/M7 as a co-processor for signal conditioning tasks: the single-cycle MAC DSP engine filters and demodulates sensor or line signals while a host processor handles higher layers, communicating over SPI or UART through its three serial ports. 4 DMA channels stream ADC samples into the 16KB RAM without CPU loading, and the 128KB FLASH holds FIR/IIR filter coefficient sets. The deterministic 100 MHz core guarantees consistent processing latency, important for timing-sensitive telecom functions. Its 48-VQFN package conserves board space in dense line-card and module designs.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33CK128MC105-I/M7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33CK64MC105-I/M7 | DSPIC33CK256MC105-I/M7 | DSPIC33CK128MC106-I/M7 | DSPIC33CK32MC105-I/M7 |
|---|---|---|---|---|---|
| Package | 48-VQFN (6x6 mm) | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same | 48-VQFN (6x6 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Speed | 100 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz |
| FLASH Program Memory | 128KB | 64KB | 256KB | 128KB | 32KB |
| RAM | 16KB | 8KB (family scaling) | 24KB (family scaling) | 16KB | 4KB (family scaling) |
| Operating Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Temperature Grade | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Peripheral Set | 12-bit ADC (20ch), 2x 12-bit DAC, Hi-Res PWM, OpAmps | Identical peripheral set | Identical peripheral set | Different ADC/PWM channel mapping | Identical peripheral set |
Key Differentiators
- Balanced 128KB FLASH for mid-complexity FOC firmware (vs DSPIC33CK64MC105-I/M7)
- Lower cost than the larger-memory family member (vs DSPIC33CK256MC105-I/M7)
- Consistent peripheral mapping within MC105 subfamily (vs DSPIC33CK128MC106-I/M7)
Design Notes
The 48-VQFN (6x6 mm) package has an exposed thermal pad that must be soldered to a solid ground pour with a via array (typically a 3x3 or larger grid) to the internal ground plane. This pad is the primary ground return and heat path. Use NSMD pads and stencil apertures of approximately 80% coverage to prevent solder voiding under the die, which would degrade both grounding integrity and thermal performance in high-power motor-control designs.
Supply range is 3.0V to 3.6V - a narrow window. Estimated: if your upstream regulator has 2% tolerance plus 1% load-line droop at 3.3V nominal, the rail can swing 3.23V-3.37V, safely inside the window; but avoid LDO choices with wide output tolerance or battery-powered designs where rail sag below 3.0V resets the DSC. Decouple each VDD pin with 100nF ceramics placed within 2mm, plus one bulk 10uF capacitor near the device.
When using the 20-channel 12-bit ADC for motor phase-current sampling, dedicate the ADC pins closest to the shunt amplifiers and route them as short analog traces away from PWM gate-drive lines. Use the peripheral pin-select (PPS) feature to place digital functions on pins physically distant from analog inputs. Enable the on-chip op-amps for single-shunt current sensing to reduce external component count and noise pickup on the sense network.
Do not assume pin compatibility across the dsPIC33CK MC105/MC106 variants at the peripheral level: although the package footprint is identical, the MC106 has a different peripheral-to-pin mapping. Migrating designs between variants requires recompiling with the correct device header and re-verifying PPS assignments in firmware. Also, the T-I/M7 reel variant and tray version are electrically identical - order the correct packaging format for your SMT line.
Compliance Information
Compliance data not explicitly stated in the retrieved web data. Generate an official material declaration from Microchip's website or request certificates from your distributor. Standard production of this package is generally RoHS/lead-free, but this should be confirmed with the manufacturer's certificate.
