DSPIC33EP256MC502-E/SO - 16-bit 60 MIPS DSC 256KB Flash | Microchip
MPN: DSPIC33EP256MC502-E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.18 | $41.80 |
| 100 | $3.71 | $371.00 |
| 500 | $3.34 | $1,670.00 |
| 1,000 | $3.02 | $3,020.00 |
DSPIC33EP256MC502-E/SO Overview
A digital signal controller combines the compute architecture of a microcontroller with the mathematical throughput of a DSP. Within the power management hierarchy of embedded systems, a DSC such as the dsPIC33EP256MC502 sits between a general-purpose MCU and a dedicated DSP, providing deterministic single-cycle MAC (multiply-accumulate) instructions plus the peripherals needed for closed-loop control.
Key features include the 16-bit dsPIC DSC core with DSP engine, up to 70 MIPS capability in the family (60 MHz operation for this part), high-resolution PWM modules suited to motor control, integrated operational amplifiers and high-speed 10/12-bit ADCs, plus standard serial interfaces (UART, SPI, I2C). The E-grade temperature rating of -40C to +125C and AEC-Q100 qualification reported by distributors make it suitable for harsh automotive and industrial environments.
Architecturally, the device uses an enhanced Harvard pipeline with 24-bit instruction words, hardware looping and bit-reversed addressing for FFT-class algorithms, and multiple interrupt vector tables for deterministic real-time response. Flash self-programming supports field firmware updates.
Typical applications include precision motor control (BLDC, PMSM, ACIM with field-oriented control), digital power supplies and inverters, and sensor signal conditioning where the on-chip op amps and ADC close analog loops without external components.
Design consideration: the VCAP/VDDCORE pin requires an external low-ESR capacitor (per the manufacturer datasheet) for the internal core regulator; omitting it prevents reliable startup.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP256MC502-E/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 DSPIC33EP256MC502-E/SO (same form factor and footprint) — differing in ADC Resolution, Package, Core Architecture, DMA Channels, Maximum CPU Speed.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP256MC502-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256MC202-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.48 / Unit
View Datasheet →DSPIC33EP128MC502-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.29 / Unit
View Datasheet →DSPIC33EP128MU502-E/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.12 / Unit
View Datasheet →DSPIC33EP64MC502-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256MC502-E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC DSC core |
| Maximum CPU Speed | 60 MIPS |
| Program Memory (Flash) | 256KB (85.5K x 24) |
| SRAM | 32KB |
| Package | 28-SOIC (7.50 mm wide) |
| Operating Temperature Range | -40C to +125C |
| Mounting Type | Surface Mount |
| PWM Peripherals | High-speed PWM for motor control |
| ADC Resolution | 10/12-bit high-speed ADC |
| On-chip Op Amps | Yes (integrated op amps) |
| Serial Interfaces | UART, SPI, I2C |
| ICSP Programming | Yes (multiple PGECx/PGEDx pairs) |
| AEC-Q100 | Qualified (per Microchip USA distributor listing) |
| RoHS Status | Compliant |
| Core Regulator | Internal regulator with external VCAP pin |
DSPIC33EP256MC502-E/SO Pin Configuration
| Pin 1 | MCLR — Master clear reset (active low) / programming voltage input |
| Pin 2 | AN0/VREF+/CN3/RB0 — Analog input 0 / ADC positive reference / change notification |
| Pin 3 | AN1/VREF-/CN2/RB1 — Analog input 1 / ADC negative reference |
| Pin 4 | PGED1/AN2/C1IN-/RP1/RB2 — ICSP data 1 / analog input 2 / comparator input / remappable pin |
| Pin 5 | PGEC1/AN3/C1IN+/RP2/RB3 — ICSP clock 1 / analog input 3 / comparator input / remappable pin |
| Pin 6 | AN4/C1IN-/RP3/RB4 — Analog input 4 / comparator input / remappable pin |
| Pin 7 | VDD — Positive supply |
| Pin 8 | VSS — Ground |
| Pin 9 | OSC1/CLKI/RA2 — Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKO/RC15 — Oscillator crystal output / clock output |
| Pin 11 | EMUD1/SDA1/RP35/RF3 — Emulation data 1 / I2C data 1 / remappable pin |
| Pin 12 | EMUC1/SCL1/RP36/RF2 — Emulation clock 1 / I2C clock 1 / remappable pin |
| Pin 13 | PGED2/EMUD3/AN5/C1IN+/RP0/RB5 — ICSP data 2 / analog input 5 / remappable pin |
| Pin 14 | VSS — Ground |
| Pin 15 | PGEC2/EMUC3/AN6/OCFA/RB6 — ICSP clock 2 / analog input 6 / PWM fault input |
| Pin 16 | AN7/RB7 — Analog input 7 / general purpose I/O |
| Pin 17 | AN8/RB8 — Analog input 8 / general purpose I/O |
| Pin 18 | AN9/RB9 — Analog input 9 / general purpose I/O |
| Pin 19 | AN10/RB10 — Analog input 10 / general purpose I/O |
| Pin 20 | AN11/RB11 — Analog input 11 / general purpose I/O |
| Pin 21 | AN12/RB12 — Analog input 12 / general purpose I/O |
| Pin 22 | AN13/RB13 — Analog input 13 / general purpose I/O |
| Pin 23 | AN14/RB14 — Analog input 14 / general purpose I/O |
| Pin 24 | AN15/RB15 — Analog input 15 / general purpose I/O |
| Pin 25 | AVSS — Analog ground |
| Pin 26 | AVDD — Analog positive supply |
| Pin 27 | VCAP/VDDCORE — Internal core regulator output - external low-ESR capacitor required |
| Pin 28 | VDD — Positive supply |
Typical Applications
DSPIC33EP256MC502-E/SO is suitable for 6 applications: BLDC/PMSM Motor Control (Field-Oriented Control), Digital Power Supplies and Inverters, Industrial Automation and Control Nodes, Automotive Auxiliary Control Units, Sensor Signal Conditioning and Data Acquisition, Appliance and HVAC Motor Drives.
BLDC/PMSM Motor Control (Field-Oriented Control)
The DSPIC33EP256MC502-E/SO is purpose-built by Microchip for precision motor control. Its high-speed PWM module generates complementary outputs with hardware dead-time, while the 60 MIPS DSP engine executes the Clarke/Park transforms and PI loops of field-oriented control (FOC) in a single 28-pin SOIC device. The integrated op amps condition shunt-resistor current feedback directly into the high-speed ADC, eliminating external amplifiers and reducing loop latency. Placed between the gate driver and current-sense shunts, the controller closes a current loop fast enough for tens-of-kilohertz switching frequencies; the E-grade -40C to +125C rating supports under-hood and sealed industrial drives.
Recommended
Digital Power Supplies and Inverters
In digital power designs such as PFC stages, LLC and phase-shifted full-bridge converters, the DSPIC33EP256MC502-E/SO acts as the digital control loop core. Its 60 MIPS core executes voltage and current compensation loops at rates matching switching frequencies in the tens of kilohertz, and the high-resolution PWM provides phase-shift control with hardware dead-time insertion for zero-voltage-switching topologies. The high-speed ADC samples feedback signals synchronously with the PWM period, minimizing loop delay that would otherwise limit achievable bandwidth. The 256KB Flash leaves ample room for communication stacks and firmware-update images in field-deployed power products.
Recommended
Industrial Automation and Control Nodes
The DSPIC33EP256MC502-E/SO fits industrial control nodes that combine real-time control with serial connectivity. The 60 MIPS core with DSP instructions handles filtering, FFT-based condition monitoring, and control algorithms, while UART, SPI and I2C interfaces connect the node to PLC backbones, sensors and HMIs. The 28-SOIC package is widely used in retrofit and legacy industrial boards, and the -40C to +125C temperature range withstands panel and machinery environments. Multiple PGECx/PGEDx pairs allow in-system firmware updates without removing the device, supporting long service-life industrial equipment.
Recommended
Automotive Auxiliary Control Units
With AEC-Q100 qualification and the E-grade -40C to +125C temperature range, the DSPIC33EP256MC502-E/SO targets automotive auxiliary control functions such as pump/fan motor drives, actuator control, and sensor fusion pre-processing. The 28-SOIC package suits compact, cost-sensitive ECU daughter boards, and the internal core regulator with external VCAP capacitor reduces the external power-tree complexity. Designers should follow Microchip's automotive qualification documentation and board-level guidelines for load-dump robustness at the supply input, and the 256KB Flash accommodates diagnostic and calibration code layers required in automotive software.
Recommended
Sensor Signal Conditioning and Data Acquisition
The on-chip op amps and high-speed 10/12-bit ADC make the DSPIC33EP256MC502-E/SO a compact sensor-conditioning hub. Bridge or shunt signals can be amplified by the internal op amps and digitized without external analog ICs, while the 60 MIPS DSP engine applies digital filtering (IIR/FIR), oversampling and calibration math in real time. The 32KB SRAM buffers waveforms for analysis or burst transmission over UART/SPI. The E-grade temperature rating keeps gain and offset calibration valid across harsh environments, making the device attractive for industrial pressure/flow sensors and portable instrumentation built around the 28-SOIC footprint.
Recommended
Appliance and HVAC Motor Drives
Consumer appliance and HVAC systems use the DSPIC33EP256MC502-E/SO to drive BLDC fans, compressors and pumps with sensorless or sensored control. The high-speed PWM with complementary outputs and dead-time drives standard three-phase gate-driver topologies, and the integrated op amps read leg-shunt currents for sensorless FOC, reducing BOM cost versus discrete signal-chain solutions. The 28-SOIC package is hand-processable for low-volume appliance repair boards and automated for volume production. The 256KB Flash stores multiple control profiles and OTA-style update code, a common requirement in connected appliance platforms.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP256MC502-E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256MC502-I/SO | DSPIC33EP256MC202-I/SO | DSPIC33EP128MC502-I/SO | DSPIC33EP128MU502-E/SO | DSPIC33EP64MC502-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (7.50 mm) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256KB (85.5K x 24) | 256KB | 256KB | 128KB | 128KB | 64KB |
| CPU Speed | 60 MIPS | 60 MIPS | 60 MIPS | 60 MIPS | 60 MIPS | 60 MIPS |
| Operating Temperature | -40C to +125C (E grade) | -40C to +85C | -40C to +85C (I grade) | -40C to +85C | -40C to +125C | -40C to +85C |
| USB Peripheral | No | No | No | No | Yes (full-speed USB) | No |
| Typical Use Case | Automotive/extended-temp precision motor control | Industrial motor control (up to 85C) | Reduced-peripheral motor control | Cost-optimized motor control | Extended-temp USB-connected control | Small-footprint motor control |
Key Differentiators
- Extended temperature range for automotive environments (vs DSPIC33EP256MC502-I/SO)
- Full 256KB Flash in 28-pin footprint (vs DSPIC33EP128MC502-I/SO)
- Motor-control analog integration (vs DSPIC33EP128MU502-E/SO)
Design Notes
The internal core regulator requires a low-ESR ceramic capacitor (value per family datasheet DS70000657J) on the VCAP/VDDCORE pin (pin 27). Never drive this pin externally and do not place inductance between it and the capacitor. Decouple each VDD pin with 0.1 uF ceramic placed within 5 mm, and filter AVDD (pin 26) through an RC or ferrite from the digital 3.3V rail to preserve ADC accuracy in motor-control sampling loops.
Route PWM outputs away from the analog inputs feeding the on-chip op amps and ADC; the synchronous sampling architecture helps, but ground bounce from gate-drive switching can still couple into shunt signals. Use a solid ground plane, connect AVSS and VSS at a single low-impedance point, and keep the PGEC/PGED programming pairs routed to a 5-pin header for in-system updates - matched pairs must stay as pairs per NSDSP programming guidance.
Two frequent mistakes: (1) selecting the I-grade (-40C to +85C) part for an enclosure that reaches 100C - only the E/SO grade covers +125C; (2) leaving the PWM fault input (OCFA on pin 15) unconnected instead of wiring it to the gate-driver fault signal, which disables hardware fast shutdown and risks shoot-through during a fault. Also confirm which PGECx/PGEDx pair your programmer expects before finalizing the header pinout.
Use the Peripheral Pin Select (PPS) feature to keep high-frequency PWM outputs and remappable RPx pins on the side of the package facing the gate drivers, minimizing trace length. For I2C (SDA1/SCL1 on pins 11-12), fit pull-up resistors sized for bus capacitance; at 400 kHz this is typically 2-4 kOhm on a 3.3V rail. Estimated values - verify against bus load in your layout.
Compliance Information
AEC-Q100 qualification and -40C to +125C range per Microchip USA distributor listing. RoHS/lead-free per standard Microchip E/SO product offering; verify REACH and conflict-mineral declarations on microchip.com.
