DSPIC33EP256GM306T-I/MR - 16-bit 70MIPS DSC 256KB Flash | Microchip
MPN: DSPIC33EP256GM306T-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
DSPIC33EP256GM306T-I/MR Overview
A digital signal controller combines the compute architecture of a microcontroller with the multiply-accumulate (MAC) DSP engine of a digital signal processor. In the power-management hierarchy of embedded systems, a DSC such as the dsPIC33EP256GM306 sits above general-purpose MCUs for control-loop-intensive tasks, executing deterministic, single-cycle DSP instructions for precision motor control, digital power conversion, and sensor signal processing.
Key differentiating features include the 70 MIPS dsPIC33E core with DSP instruction set and barrel shifter, 256 KB of self-programmable Flash, four DMA channels that offload data movement from the CPU, thirteen 16-bit timers, and multiple motor-control PWM modules (12 MCP channels) with 8 input-capture and 8 output-compare channels plus 2 quadrature encoder interfaces (QEI). On-chip op-amps further reduce external component count in current-sense circuits.
Technically, the device is fabricated in CMOS, operates from a 3.0 V to 3.6 V supply, and is rated for the industrial -40C to +85C temperature range (I suffix). Four serial I/O interfaces support UART, SPI, and I2C connectivity, while boundary-scan (JTAG) support aids production test.
Typical applications include brushless DC and PMSM motor drives, digital power supplies (PFC, LLC), solar inverters, industrial automation sensors, and lighting control, where deterministic interrupt latency and hardware QEI inputs directly improve control-loop bandwidth.
Design consideration: budget the VQFN exposed pad as the primary ground return and thermal path; a solid ground pour under the 9x9 mm footprint is essential for signal integrity of the high-speed PWM edges.
This page synthesizes distributor availability data, same-footprint alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP256GM306T-I/MR — 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 DSPIC33EP256GM306T-I/MR (same form factor and footprint) — differing in Package, Operating Temperature, Core, RAM, Quadrature Encoder Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP256GM306T-E/MR
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33EP512GM306-I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.55 / Unit
View Datasheet →DSPIC33EP128GM306-I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.1 / Unit
View Datasheet →DSPIC33EP64GM306-I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256GM606-I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256GM306T-I/MR Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC33E DSC core with DSP engine |
| Maximum Performance | 70 MIPS |
| Program Memory (Flash) | 256 KB (85.5K x 24) |
| Data Memory (RAM) | 16 KB |
| Operating Voltage Range | 3.0 V to 3.6 V |
| Operating Temperature Range | -40C to +85C (I grade) |
| Package | 64-VQFN (9x9 mm) exposed pad |
| Mounting Type | Surface Mount |
| Timers | 13 x 16-bit |
| DMA Channels | 4 |
| Motor Control PWM | 12 MCP channels |
| Input Capture / Output Compare | 8 IC / 8 OC |
| Quadrature Encoder Interfaces | 2 QEI |
| Serial Interfaces | 4 serial I/O (UART/SPI/I2C) |
| On-chip Op-Amps | Yes (integrated operational amplifiers) |
| Process Technology | CMOS |
| Boundary Scan / JTAG | Yes |
| Packaging | Tape and Reel (T suffix) |
DSPIC33EP256GM306T-I/MR 64-vqfn (9x9 mm) exposed pad Pin Configuration Guide
Pin configuration for DSPIC33EP256GM306T-I/MR (64-vqfn (9x9 mm) exposed pad 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 DSPIC33EP256GM306T-I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33EP256GM306T-I/MR is suitable for 6 applications: Brushless DC / PMSM Motor Drives, Digital Power Supplies (PFC / LLC), Industrial Automation and Sensor Nodes, Solar Inverters and Energy Conversion, LED Lighting and Dimming Control, Embedded Signal Processing and Data Acquisition.
Brushless DC / PMSM Motor Drives
The DSPIC33EP256GM306T-I/MR fits motor control precisely: its 12 motor-control PWM channels generate complementary dead-time-controlled drive signals for three-phase inverters, while 2 quadrature encoder interfaces and input captures handle position and speed feedback. According to Microchip, the 70 MIPS dsPIC33E core with single-cycle MAC enables field-oriented control (FOC) loops executed at tens of kilohertz with deterministic latency. The on-chip op-amps amplify shunt-resistor current signals, reducing external component count. Use four DMA channels to stream ADC results without CPU intervention, keeping the control ISR short. Place the controller between gate-driver inputs (e.g., MOSFET/IGBT drivers) and current-sense front ends on the same 3.3 V domain.
Recommended
Digital Power Supplies (PFC / LLC)
In digital power conversion, the DSPIC33EP256GM306T-I/MR closes high-bandwidth voltage and current loops for PFC and LLC stages. The 70 MIPS core executes PI and resonant control at switching frequencies well above 100 kHz when using the hardware PWM in complementary mode, and the 12 MCP PWM channels drive interleaved phases with precise phase shift. High-resolution PWM edge control and immediate ADC trigger synchronization minimize loop delay, directly improving transient response. The 256 KB Flash stores compensation tables and protection state machines including cycle-by-cycle current limit via PWM fault inputs. Designers typically pair it with gate drivers and shunt-based current sensing, exploiting the on-chip op-amps to condition feedback within the 3.0 V to 3.6 V supply domain.
Recommended
Industrial Automation and Sensor Nodes
For factory automation, the DSPIC33EP256GM306T-I/MR acts as an intelligent sensor hub and actuator controller. Its four serial interfaces (UART/SPI/I2C) connect to industrial transceivers and external ADCs, while 13 timers and 8 input-capture channels timestamp sensor events with microsecond resolution. The -40C to +85C industrial rating and CMOS process suit panel-mounted and machine-internal environments. The DSP engine performs FFT-based vibration analysis or filter algorithms locally, transmitting only condition flags upstream - reducing bus traffic. With 256 KB Flash, firmware can hold protocol stacks and calibration tables simultaneously; the four DMA channels keep serial streaming independent of the control loop. Select the 64-VQFN MR footprint for compact I/O-module PCBs under 40x40 mm.
Recommended
Solar Inverters and Energy Conversion
Solar micro-inverters and string optimizers benefit from the DSPIC33EP256GM306T-I/MR's combination of high-resolution PWM, fast ADC-triggered control loops, and 256 KB Flash for MPPT (maximum power point tracking) algorithms. The 70 MIPS core runs perturb-and-observe or incremental-conductance MPPT in parallel with the inverter current loop, and the dual QEI plus input-capture modules optionally track mechanical sun-tracking actuators. Four DMA channels maintain continuous ADC sampling of panel voltage/current without CPU loading. On-chip op-amps condition current-shunt feedback, and the 3.0 V to 3.6 V operation matches standard analog front ends. The -40C to +85C I-grade range covers rooftop enclosure environments; use the E/MR variant for -40C to +125C cavity locations.
Recommended
LED Lighting and Dimming Control
Professional lighting systems use the DSPIC33EP256GM306T-I/MR to generate multi-channel, phase-dimmable PWM for LED drivers. The 12 motor-control PWM channels, normally used for three-phase drives, map naturally onto independently controlled LED strings with precise dimming resolution and inter-channel synchronization - eliminating flicker at low duty cycles. The 70 MIPS DSP core implements color-mixing math, DALI/DMX protocol parsing over UART, and closed-loop current regulation via the ADC and on-chip op-amps. 256 KB Flash accommodates multiple preset scenes and communication stacks simultaneously. The 64-VQFN (9x9 mm) footprint fits driver boards integrated into luminaire housings, and the industrial temperature range supports enclosed, thermally stressed fixtures up to +85C ambient.
Recommended
Embedded Signal Processing and Data Acquisition
As a compact DSP platform, the DSPIC33EP256GM306T-I/MR executes FIR/IIR filtering, FFT spectral analysis, and control algorithms with its single-cycle multiply-accumulate engine and barrel shifter. Eight input-capture channels timestamp pulse events (flow meters, ultrasonic time-of-flight), while 4 DMA channels stream conversion results into 16 KB RAM without gaps. The 256 KB (85.5K x 24) Flash retains coefficient tables and self-test routines, and the self-programmable memory supports field algorithm updates over UART/SPI. JTAG boundary scan simplifies production test of dense acquisition boards. For prototypes, the TQFP /PT sibling of the same die eases rework; the VQFN MR package suits final compact designs where 9x9 mm footprint and exposed-pad grounding improve analog noise performance.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP256GM306T-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256GM306T-E/MR | DSPIC33EP512GM306-I/MR | DSPIC33EP128GM306-I/MR | DSPIC33EP64GM306-I/MR | DSPIC33EP256GM606-I/MR |
|---|---|---|---|---|---|---|
| Package | 64-VQFN (9x9 mm) exposed pad | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Performance | 16-bit, 70 MIPS dsPIC33EP | 16-bit, 70 MIPS | 16-bit, 70 MIPS | 16-bit, 70 MIPS | 16-bit, 70 MIPS | 16-bit, 70 MIPS |
| Flash Program Memory | 256 KB (85.5K x 24) | 256 KB | 512 KB | 128 KB | 64 KB | 256 KB |
| Temperature Range | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
| Timers / DMA | 13 timers, 4 DMA | 13 timers, 4 DMA | 13 timers, 4 DMA | 13 timers, 4 DMA | 13 timers, 4 DMA | 13 timers, 4 DMA |
| Motor-Control Peripherals | 12 MCP PWM, 8 IC/8 OC, 2 QEI | 12 MCP PWM, 8 IC/8 OC, 2 QEI | 12 MCP PWM, 8 IC/8 OC, 2 QEI | 12 MCP PWM, 8 IC/8 OC, 2 QEI | 12 MCP PWM, 8 IC/8 OC, 2 QEI | 12 MCP PWM, 8 IC/8 OC, 2 QEI |
| Key Distinction | Baseline 256 KB, I-grade, tape-and-reel | Extended temp +125C | Double Flash headroom | Cost-down, half Flash | Lowest-cost cost-down | GM6 single-partition flash |
Key Differentiators
- Highest Flash density in the verified drop-in footprint (vs DSPIC33EP128GM306-I/MR)
- Extended-temperature variant available in the same footprint (vs DSPIC33EP256GM306T-E/MR)
- Dual-partition (GM3) Flash architecture (vs DSPIC33EP256GM606-I/MR)
- Motor-control peripheral depth over cost-down siblings (vs DSPIC33EP64GM306-I/MR)
Design Notes
The 64-VQFN (9x9 mm) exposed pad must be soldered to a ground pour with a via array (5x5 or denser, 0.3 mm vias) tied to the internal ground plane. This pad serves as both the main die ground return and the thermal relief; relying on perimeter pins alone raises ground impedance and degrades ADC accuracy in motor-current sensing. Follow Microchip's QFN layout application guidance: solder-mask-defined pad opening slightly smaller than the exposed pad, and print paste in segmented grids to prevent voiding during reflow.
Decouple every VDD pin with a 100 nF X7R ceramic placed within 2 mm of the pin, plus at least one 4.7 uF-10 uF bulk capacitor near the package. The 70 MIPS core and 12-channel PWM switching create fast supply transients; a shared 3.3 V rail with analog circuits should be filtered (ferrite bead + local bulk) before the AVDD/VDDCORE nodes. Keep the core-capacitor (VDDCORE) connection exactly per datasheet reference design - incorrect capacitance here causes brown-out resets under simultaneous PWM edge loading.
Route motor-control PWM outputs on an inner layer adjacent to a continuous ground plane and keep each phase-pair (high/low side) tightly coupled to cancel loop inductance. Separate analog routing (op-amp inputs, current-shunt sense) from PWM traces by at least 2x trace width, and place the shunt sense filter (typically 100 ohm + 1 nF) directly at the MCU pins. Use the peripheral pin select to keep crystal/oscillator traces short and away from PWM; JTAG/ICSP header routing may be shared but must not load PWM edges during production.
Three frequent issues with the dsPIC33EP GM306: (1) exceeding the 3.6 V supply maximum when connecting a nominal 3.3 V rail with poor regulation - measure worst-case; (2) operating the E-vs-I grade part above its rated temperature - the I-grade part is limited to +85C, so verify enclosure derating rather than assuming E-grade limits; (3) forgetting the 24-bit instruction-word architecture when porting from PIC16/18 code - data-space and program-space addressing differ, and compiler memory models must be reconfigured for 256 KB Flash.
Compliance Information
TrustCompo listing describes the part as RoHS-compliant, lead-free, and green. REACH, halogen-free, and conflict-minerals status not stated in the verified data - confirm on the Microchip product page.
