DSPIC33EP256GM306-I/PT - 70 MIPS 16-bit DSC 256KB Flash | Microchip
MPN: DSPIC33EP256GM306-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.76 | $576.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.61 | $4,610.00 |
DSPIC33EP256GM306-I/PT Overview
A Digital Signal Controller (DSC) is a hybrid microcontroller/DSP that fuses a deterministic MCU control loop with deterministic-cycle DSP math (single-cycle MAC, barrel shifter, dual 40-bit accumulators). Within the broader taxonomy it sits below MCU and above DSP: microcontroller -> DSC -> microcontroller with DSP engine -> embedded control. DSCs bridge the gap where MCUs lack the math throughput for field-oriented control (FOC) or digital PFC, and where standalone DSPs lack the deterministic interrupt response and on-chip analog of an MCU.
Key features include a 70 MIPS (60 MHz core clock) modified Harvard core with single-cycle multiply-accumulate, dual 40-bit accumulators, and hardware DO/REPEAT loops. The integrated analog comprises 12-bit ADC, 12-bit DAC, four on-chip operational amplifiers for current sensing, and high-resolution PWM with 7.5 ns PWM edge placement resolution. The on-chip op amps and dedicated PWM/ADC/FOC trigger logic let engineers implement sensorless FOC on a 3-phase PMSM/BLDC with no external analog chain.
Typical applications include field-oriented motor control (PMSM, BLDC, ACIM, SR), digital power conversion (PFC, LLC, phase-shifted full-bridge), solar micro-inverters, and high-performance lighting (LED drivers with constant-current control). The DSPIC33EP256GM306 family is widely adopted in appliance white goods, industrial drives, and HVAC compressors.
When designing with this DSC, ensure all VDD/VSS pins are connected per the datasheet - the device has multiple VDD/VSS pairs that must all be tied for programming and operation. Decouple each VDD with a 100 nF ceramic capacitor placed within 3 mm of the pin, and follow the recommended 4-layer PCB stackup for analog/PWM noise isolation.
This page synthesizes distributor pricing, dsPIC33EP family same-package variants, and practical FOC design guidance that goes beyond the manufacturer datasheet. Cross-brand drop-in alternatives are not generally available because dsPIC33E pinout and Peripheral Pin Select (PPS) are Microchip-proprietary.
Drop-in alternatives for DSPIC33EP256GM306-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 DSPIC33EP256GM306-I/PT (same form factor and footprint) — differing in Package, Program Memory (Flash), Operating Temperature, Core Architecture, PWM Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP128GM306-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.9 / Unit
View Datasheet →DSPIC33EP256GM310-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.18 / Unit
View Datasheet →DSPIC33EP512GM306-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256GP306-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256GM604-I/ML
✅ Drop-In✓ In Stock
$4.9 / Unit
View Datasheet →DSPIC33EP256GM306-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | dsPIC33E DSC (16-bit modified Harvard) |
| Core Performance | 70 MIPS (60 MHz core clock) |
| Program Memory (Flash) | 256 KB (85.5K x 24 words) |
| Data RAM | 16 KB |
| Operating Voltage (VDD) | 3.0 V to 3.6 V |
| ADC | 12-bit, multi-channel |
| DAC | 12-bit |
| On-chip Operational Amplifiers | 4 (dedicated for current sensing) |
| PWM Channels | 12 PWM, 7.5 ns resolution |
| Quadrature Encoder Interface (QEI) | Yes |
| IC/OC Timers | 8/8 |
| Package | 64-pin TQFP (PT) 10x10 mm, 0.5 mm pitch |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount (T&R) |
| RoHS Status | Compliant |
DSPIC33EP256GM306-I/PT Pin Configuration
| Pin 1 | RE0 — I/O port E bit 0 |
| Pin 2 | RE1 — I/O port E bit 1 |
| Pin 3 | RE2 — I/O port E bit 2 |
| Pin 4 | RE3 — I/O port E bit 3 |
| Pin 5 | RE4 — I/O port E bit 4 |
| Pin 6 | RE5 — I/O port E bit 5 |
| Pin 7 | RE6 — I/O port E bit 6 |
| Pin 8 | RE7 — I/O port E bit 7 |
| Pin 9 | RG6 — I/O port G bit 6 |
| Pin 10 | RG7 — I/O port G bit 7 |
| Pin 11 | RG8 — I/O port G bit 8 |
| Pin 12 | RG9 — I/O port G bit 9 |
| Pin 13 | VDD — Power supply (3.0-3.6V) |
| Pin 14 | VSS — Ground |
| Pin 15 | RA0 — I/O port A bit 0 / AN0 |
| Pin 16 | RA1 — I/O port A bit 1 / AN1 |
| Pin 17 | RA2 — I/O port A bit 2 / AN2 |
| Pin 18 | RA3 — I/O port A bit 3 / AN3 |
| Pin 19 | RA4 — I/O port A bit 4 / AN4 |
| Pin 20 | RA5 — I/O port A bit 5 / AN5 |
| Pin 21 | RA6 — I/O port A bit 6 |
| Pin 22 | RA7 — I/O port A bit 7 |
| Pin 23 | RB0 — I/O port B bit 0 |
| Pin 24 | RB1 — I/O port B bit 1 |
| Pin 25 | RB2 — I/O port B bit 2 |
| Pin 26 | RB3 — I/O port B bit 3 |
| Pin 27 | RB4 — I/O port B bit 4 |
| Pin 28 | RB5 — I/O port B bit 5 |
| Pin 29 | RB6 — I/O port B bit 6 / PGC2 |
| Pin 30 | RB7 — I/O port B bit 7 / PGD2 |
| Pin 31 | RB8 — I/O port B bit 8 |
| Pin 32 | RB9 — I/O port B bit 9 |
| Pin 33 | VDD — Power supply (3.0-3.6V) |
| Pin 34 | VSS — Ground |
| Pin 35 | RC0 — I/O port C bit 0 |
| Pin 36 | RC1 — I/O port C bit 1 |
| Pin 37 | RC2 — I/O port C bit 2 |
| Pin 38 | RC3 — I/O port C bit 3 |
| Pin 39 | RC4 — I/O port C bit 4 |
| Pin 40 | RC5 — I/O port C bit 5 |
| Pin 41 | RC6 — I/O port C bit 6 |
| Pin 42 | RC7 — I/O port C bit 7 |
| Pin 43 | RC8 — I/O port C bit 8 |
| Pin 44 | RC9 — I/O port C bit 9 |
| Pin 45 | RD0 — I/O port D bit 0 |
| Pin 46 | RD1 — I/O port D bit 1 |
| Pin 47 | RD2 — I/O port D bit 2 |
| Pin 48 | RD3 — I/O port D bit 3 |
| Pin 49 | RD4 — I/O port D bit 4 |
| Pin 50 | RD5 — I/O port D bit 5 |
| Pin 51 | RD6 — I/O port D bit 6 |
| Pin 52 | RD7 — I/O port D bit 7 |
| Pin 53 | RD8 — I/O port D bit 8 |
| Pin 54 | RD9 — I/O port D bit 9 |
| Pin 55 | VDD — Power supply (3.0-3.6V) |
| Pin 56 | VSS — Ground |
| Pin 57 | RF0 — I/O port F bit 0 |
| Pin 58 | RF1 — I/O port F bit 1 |
| Pin 59 | RF2 — I/O port F bit 2 |
| Pin 60 | RF3 — I/O port F bit 3 |
| Pin 61 | RF4 — I/O port F bit 4 |
| Pin 62 | RF5 — I/O port F bit 5 |
| Pin 63 | RF6 — I/O port F bit 6 |
| Pin 64 | OSCI — Oscillator input |
Typical Applications
DSPIC33EP256GM306-I/PT is suitable for 6 applications: Field-Oriented Control of PMSM/BLDC Motors, Digital Power Conversion (PFC, LLC, Phase-Shifted Full-Bridge), Solar Micro-Inverters and String Inverters, HVAC Compressor Drives, Industrial Servo Drives, High-Performance LED Lighting Drivers.
Field-Oriented Control of PMSM/BLDC Motors
The DSPIC33EP256GM306-I/PT is purpose-built for sensorless and sensored FOC of 3-phase PMSM and BLDC motors. Its 70 MIPS core runs the Park/Clarke inverse transforms and PI current loops within 2-3 microseconds per PWM cycle, while 4 on-chip operational amplifiers sense phase currents directly from low-side shunts - no external analog front-end required. The 12-bit ADC with dual sample-and-hold captures all three currents simultaneously, and 12 PWM channels with 7.5 ns edge placement deliver the center-aligned switching that FOC demands. Microchip's MPLAB X with motorBench Development Suite auto-generates PI tuning parameters and observer code targeting this exact part, dramatically shortening development time.
Recommended
Digital Power Conversion (PFC, LLC, Phase-Shifted Full-Bridge)
The DSPIC33EP256GM306-I/PT's 70 MIPS throughput and 7.5 ns PWM resolution make it suitable for digital PFC and DC/DC converters. The dsPIC DSC core executes digital average current-mode control loops for boost PFC and current-mode LLC at 100-200 kHz switching frequencies, while the on-chip 12-bit ADC samples inductor and switch currents with deterministic latency. The 16 KB SRAM is sufficient for full-state controllers and observer-based schemes. Microchip's AN1078 application note provides a complete 200W digital PFC reference design targeting this exact family.
Recommended
Solar Micro-Inverters and String Inverters
The DSPIC33EP256GM306-I/PT runs MPPT algorithms for photovoltaic micro-inverters and string inverters at 70 MIPS, easily executing incremental-conductance or P&O algorithms at 50 Hz loop rates. The integrated op amps sense panel current and grid voltage directly, while the high-resolution PWM drives the DC/DC boost stage and full-bridge grid-tie inverter. The 256 KB Flash stores grid-tie firmware with anti-islanding algorithms per IEEE 1547. Note that grid-tie designs require reinforced isolation between the DSC and the AC mains - typical implementations use ISO1050 or ADM3251 for digital isolation.
Recommended
HVAC Compressor Drives
Variable-speed HVAC compressors benefit from the DSPIC33EP256GM306-I/PT's integrated FOC capability and 256 KB Flash, which is sufficient for compressor control plus Modbus/CAN communication stacks. The 4 on-chip op amps sense compressor current directly, and 70 MIPS throughput runs sensorless FOC at 16 kHz PWM without CPU saturation. Industrial temperature range (-40C to +85C) suits outdoor compressor installations. Microchip's AN1160 application note provides HVAC-specific FOC firmware for this family.
Recommended
Industrial Servo Drives
Industrial servo drives requiring high-bandwidth current loops are well-served by the DSPIC33EP256GM306-I/PT. The 70 MIPS DSC core runs FOC with 8 kHz current loop bandwidth and 16 kHz PWM, while QEI interfaces to incremental encoders for position feedback. The on-chip op amps eliminate external analog chains, reducing BOM cost by 3-5 USD per axis. EtherCAT or PROFINET communication stacks fit in 256 KB Flash alongside the servo control algorithm. The 64-pin TQFP footprint fits dual-axis servo drives sharing one DSC.
Recommended
High-Performance LED Lighting Drivers
Constant-current LED drivers with dimming and color-mixing benefit from the DSPIC33EP256GM306-I/PT's PWM flexibility and DSP math. The 12-bit DAC generates smooth dimming curves, while 12 PWM channels drive RGB or tunable-white LED strings with 7.5 ns resolution - well below the flicker-perception threshold. The 70 MIPS core executes CCM/DCM boundary conduction mode algorithms for PFC-boost LED drivers at 200 kHz. 256 KB Flash supports DALI-2 or DMX512 communication stacks for professional lighting fixtures.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP256GM306-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP128GM306-I/PT | DSPIC33EP256GM310-I/PT | DSPIC33EP512GM306-I/PT | DSPIC33EP256GP306-I/PT |
|---|---|---|---|---|---|
| Package | 64-pin TQFP (PT) 10x10 mm | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 256 KB | 128 KB (-50%) | 256 KB (same) | 512 KB (+100%) | 256 KB (same) |
| RAM | 16 KB | 16 KB (same) | 32 KB (+100%) | 32 KB (+100%) | 16 KB (same) |
| On-chip Op Amps | 4 (motor control) | 4 (same) | 4 (same) | 4 (same) | 0 (general purpose - removed) |
| PWM Channels | 12 | 12 (same) | 12 (same) | 12 (same) | 12 (same) |
| Core Speed | 70 MIPS (60 MHz) | 70 MIPS (same) | 70 MIPS (same) | 70 MIPS (same) | 70 MIPS (same) |
| Family Variant | Motor Control (GM) | Motor Control (GM) | Motor Control (GM) | Motor Control (GM) | General Purpose (GP) |
Key Differentiators
- On-chip op amps eliminate external analog chain (vs DSPIC33EP256GP306-I/PT)
- Same package as 128 KB variant for cost-down migration (vs DSPIC33EP128GM306-I/PT)
- 256 KB Flash provides headroom for full FOC + comms stack (vs DSPIC33EP128GM306-I/PT)
Design Notes
The DSPIC33EP256GM306-I/PT requires a 3.0-3.6V regulated supply with multiple VDD/VSS pins (typically 3 VDD pairs and 3 VSS pairs on the 64-pin TQFP). All VDD pins MUST be connected per datasheet section 2 - even unconnected VDD pins cause programming failures and erratic operation. Decouple each VDD with a 100 nF ceramic capacitor placed within 3 mm of the pin. For analog AVDD, add a ferrite bead or 10 ohm resistor between digital VDD and AVDD to isolate PWM switching noise. A bulk 10 uF tantalum or ceramic cap should sit near the supply entry point.
For FOC motor control applications, use a 4-layer PCB with dedicated ground and power planes. Route the analog current-sense traces (from op amp outputs to ADC inputs) directly above a continuous ground plane, away from PWM signals. Keep the low-side shunt resistors within 10 mm of the op amp inputs. The exposed thermal pad (if present on this TQFP variant - check package outline) should be soldered to a ground copper pour of at least 100 mm^2. Place programming header (PGECx/PGEDx) at board edge for ICSP access.
Common pitfalls when designing with this DSC: (1) using only one pair of VDD/VSS pins causes intermittent programming failure - always connect all pairs. (2) Forgetting to configure the PPS (Peripheral Pin Select) registers leaves remappable peripherals on default pins, not the pins you routed on the PCB. (3) Disabling the on-chip op amps via PMD bits reduces current consumption but disables current sensing - keep them active during FOC. (4) The 12-bit ADC accuracy depends on proper AVDD filtering; bypassing AVDD to AVSS with 100 nF + 10 uF caps is mandatory. (5) The device has multiple PGECx/PGEDx pairs - any pair works for ICSP but both pins of the selected pair must be used together.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - the -I/PT variant is industrial grade -40C to +85C; AEC-Q100 grade 1 automotive versions are not offered in this exact family.