DSPIC33EP128MU502-E/SO - 16-Bit DSC, 128KB Flash, USB | Microchip
MPN: DSPIC33EP128MU502-E/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.64 | $1,820.00 |
| 1,000 | $3.12 | $3,120.00 |
DSPIC33EP128MU502-E/SO Overview
A Digital Signal Controller is a hybrid class of embedded processor that merges the deterministic interrupt handling and peripheral set of a microcontroller (MCU) with the mathematical throughput of a digital signal processor (DSP). Within the power-management hierarchy, a DSC sits above a general-purpose MCU for control-loop-intensive tasks such as digital power conversion, motor control, and sensor fusion, where single-cycle MAC and divide operations materially shorten control-loop execution time.
Key features of this device include the 16-bit modified Harvard dsPIC33E core running up to 70 MIPS, 128 KB Flash with 1 KB data Flash for calibration constants, dual 12-bit ADCs delivering up to 10 Msps sampling, and an integrated full-speed USB 2.0 device/OTG peripheral that is rare in 28-pin DSCs. Connectivity is rounded out by a CAN 2.0B controller, multiple UART, SPI and I2C channels, and hardware support for ECAN-based networking.
The architecture pairs the high-performance core with a DMA controller, 16 x 16 multiply with 32/40-bit accumulate DSP engine, and flexible clocking (internal FRC PLL or external crystal up to 140 MHz device frequency equivalents). Peripheral Pin Select (PPS) allows digital peripherals to be remapped onto most RPx pins, easing PCB layout and reducing board rework risk. This makes the part well suited to digital power supplies, brushless DC and PMSM motor control, USB-connected instrumentation, and CAN-based industrial nodes.
Typical applications include 3-phase motor inverters where dual ADCs sample phase currents synchronously, digital LED lighting and power factor correction stages, and USB-connected industrial sensors that also bridge onto a CAN bus.
When designing with this device, budget the VCAP/VDDCORE capacitor carefully: the internal 2.5V core regulator requires a low-ESR 10 uF tantalum or ceramic capacitor plus a 0.1 uF bypass for stable operation.
This page synthesizes distributor availability data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering-context value beyond the raw specification listing.
Drop-in alternatives for DSPIC33EP128MU502-E/SO β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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DSPIC33EP128MU502-I/SO
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$3.85 / Unit
View Datasheet βDSPIC33EP256MU502-E/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
DSPIC33EP64MU502-E/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
DSPIC33EP128MU502-E/SO Maximum Ratings & Electrical Characteristics
| Core | dsPIC33E, 16-bit |
| Maximum CPU Speed | 70 MIPS |
| Program Memory Size | 128 KB Flash |
| Data Flash | 1 KB |
| RAM Size | 16 KB |
| ADC Resolution | 12-bit |
| Number of ADCs | 2 |
| USB | USB 2.0 Full Speed Device/OTG |
| CAN | CAN 2.0B (ECAN) |
| Communication Interfaces | USB, CAN, UART, SPI, I2C |
| Operating Temperature Range | -40C to +125C (Extended, E grade) |
| Supply Voltage Range | 3.0 V to 3.6 V |
| Package | 28-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| Programmability | In-Circuit Serial Programming (ICSP) |
| RoHS Status | Compliant |
| DMA Channels | 8 |
DSPIC33EP128MU502-E/SO Pin Configuration
| Pin 1 | MCLR β Master clear reset / programming voltage input |
| Pin 2 | AN0/VREF+/RB0 β Analog input 0 / ADC positive reference / port B0 |
| Pin 3 | AN1/VREF-/RB1 β Analog input 1 / ADC negative reference / port B1 |
| Pin 4 | AN2/SS1/RB2 β Analog input 2 / SPI slave select 1 / port B2 |
| Pin 5 | AN3/RB3 β Analog input 3 / port B3 |
| Pin 6 | AN4/C2IN+/RB4 β Analog input 4 / comparator 2 input / port B4 |
| Pin 7 | VDD β Positive supply (3.0 V to 3.6 V) |
| Pin 8 | OSC1/CLKI β Crystal oscillator input / external clock input |
| Pin 9 | OSC2/CLKO/RC15 β Crystal oscillator output / clock output / port C15 |
| Pin 10 | VSS β Ground reference |
| Pin 11 | AN5/PGD1/RB5 β Analog input 5 / programming data 1 / port B5 |
| Pin 12 | AN6/PGC1/RP2 β Analog input 6 / programming clock 1 / remappable pin RP2 |
| Pin 13 | AN7/RP3 β Analog input 7 / remappable pin RP3 |
| Pin 14 | AN8/C1IN-/RP4 β Analog input 8 / comparator 1 inverting input / remappable pin RP4 |
| Pin 15 | AN9/C1IN+/RP5 β Analog input 9 / comparator 1 non-inverting input / remappable pin RP5 |
| Pin 16 | VUSB3V3 β USB PHY 3.3 V supply - connect 3.3 V when USB is used |
| Pin 17 | D+/RG0 β USB data plus / port G0 |
| Pin 18 | D-/RG1 β USB data minus / port G1 |
| Pin 19 | VSS β Ground reference |
| Pin 20 | VDD β Positive supply (3.0 V to 3.6 V) |
| Pin 21 | PGD2/RP13 β Programming data 2 / remappable pin RP13 |
| Pin 22 | PGC2/RP12 β Programming clock 2 / remappable pin RP12 |
| Pin 23 | RP15 β Remappable peripheral pin RP15 |
| Pin 24 | RP14 β Remappable peripheral pin RP14 |
| Pin 25 | RP11 β Remappable peripheral pin RP11 |
| Pin 26 | RP26 β Remappable peripheral pin RP26 |
| Pin 27 | RP19 β Remappable peripheral pin RP19 |
| Pin 28 | VCAP/VDDCORE β Internal core regulator output - connect 10 uF low-ESR capacitor to VSS |
Typical Applications
DSPIC33EP128MU502-E/SO is suitable for 6 applications: Three-Phase Motor Control (BLDC/PMSM), USB-Connected Industrial Sensing Nodes, CAN-Based Industrial Networking Gateways, Digital Power Supplies and PFC Stages, Smart LED Lighting and Dimming Control, Portable USB Instrumentation and Test Equipment.
Three-Phase Motor Control (BLDC/PMSM)
The DSPIC33EP128MU502-E/SO fits motor-control inverters because its dsPIC33E core executes field-oriented-control loops at 70 MIPS with single-cycle MAC instructions, while its dual 12-bit ADCs sample two phase currents simultaneously - eliminating the skew that degrades torque-ripple performance on single-ADC MCUs. In a typical drive, the PWM module triggers ADC conversion at the center of the PWM period; the CPU closes the current loop in under 20 microseconds. Peripheral Pin Select routes complementary PWM outputs, quadrature encoder input, and fault inputs to layout-optimal pins. The integrated CAN 2.0B controller connects the drive to industrial fieldbus networks without an external controller chip. Its 128 KB Flash stores FOC firmware plus parameter tables, and the E-grade -40C to +125C rating suits sealed traction and industrial drives.
Recommended
USB-Connected Industrial Sensing Nodes
The DSPIC33EP128MU502-E/SO is one of the few 28-pin DSCs integrating a full-speed USB 2.0 device/OTG peripheral, making it ideal for USB-connected sensors and instrumentation that would otherwise need a separate USB interface chip. Typical deployments include laboratory data loggers, USB-powered sensor hubs, and configurable industrial transmitters. The dual 12-bit ADCs digitize sensor channels at up to 10 Msps, the 1 KB data Flash holds per-unit calibration constants, and the DMA controller streams ADC results to RAM without CPU intervention, keeping the sample stream continuous during USB packet processing. Because the device runs from 3.0 V to 3.6 V, it can be powered directly from the USB VBUS rail through an LDO. The extended -40C to +125C E-grade supports fanless industrial enclosures.
Recommended
CAN-Based Industrial Networking Gateways
With an integrated CAN 2.0B controller, 70 MIPS of headroom, and UART/SPI/I2C channels, the DSPIC33EP128MU502-E/SO serves as a protocol-bridging node in CAN-based industrial networks. It can translate between a CAN bus and Modbus-over-RS485 or SPI-connected I/O expanders, using its DMA to move frames without CPU bottlenecks. The 128 KB Flash accommodates dual firmware banks for field-updatable gateway firmware, and the 16 KB RAM buffers CAN message queues during burst traffic. Extended-temperature E grading permits deployment in unconditioned cabinets reaching 125C junction-adjacent ambient extremes. Combine it with an MCP2551-class CAN transceiver on the physical layer and a low-dropout regulator sized for the 3.3 V rail; the in-circuit programmability enables firmware updates over the existing CAN link.
Recommended
Digital Power Supplies and PFC Stages
The DSPIC33EP128MU502-E/SO implements digital power conversion - LLC half-bridge, buck, boost power-factor-correction - because the dsPIC33E core closes voltage and current loops at effective bandwidths beyond what general-purpose MCUs achieve. The dual ADCs sample input voltage, output voltage, and inductor current on PWM-cycle boundaries; the high-resolution PWM capability of the dsPIC33E family adjusts switching duty with sub-nanosecond-equivalent resolution for tight output regulation. The 70 MIPS core runs compensator math in a fraction of a switching period at 100-500 kHz switching frequencies. Its on-chip comparators provide hardware cycle-by-cycle current limiting independent of software, protecting the power stage during transients. Data Flash stores efficiency-calibration tables, and the extended temperature grade suits sealed adapter and telecom-brick form factors.
Recommended
Smart LED Lighting and Dimming Control
Digital LED drivers benefit from the DSPIC33EP128MU502-E/SO's PWM resolution and 70 MIPS core, which implement high-frequency dimming and color-mixing algorithms such as CIE-based RGB corrections in real time. Multiple PWM outputs drive MOSFET or constant-current LED channels; the 12-bit ADCs sense output current for closed-loop lumen regulation and thermal foldback using an on-board or remote temperature measurement. CAN connectivity allows fixtures to join DMX-over-CAN or building automation networks, while the optional USB interface supports fixture configuration from a PC without external interface silicon. The extended -40C to +125C E-grade is essential for enclosed high-bay and outdoor luminaires where driver-board ambient temperatures routinely exceed 85C, a rating the industrial-grade I/SO variant does not cover.
Recommended
Portable USB Instrumentation and Test Equipment
Handheld and USB-powered test instruments - digital load testers, simple oscilloscope front ends, sensor calibrators - exploit the DSPIC33EP128MU502-E/SO's combination of 10 Msps-capable 12-bit ADCs, DMA streaming, and on-chip USB device/OTG in a single 28-pin SOIC, minimizing board area and BOM count. Acquired samples stream over USB at full speed to host software, while the 16 KB RAM buffers bursts; the 1 KB data Flash retains calibration coefficients across power cycles. The core's DSP MAC instructions support real-time averaging, windowing, and FFT pre-processing before transmission, reducing host load. Power comes from the 3.3 V USB rail via an LDO with low quiescent current. Extended-temperature grading gives margin against self-heating in compact, sealed handheld enclosures.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128MU502-E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP128MU502-I/SO | DSPIC33EP256MU502-E/SO | DSPIC33EP64MU502-E/SO |
|---|---|---|---|---|
| Package | SOIC-28 | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 128 KB | 128 KB | 256 KB | 64 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB |
| Core Speed | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Temperature Range | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +125C (E grade) |
| USB Peripheral | USB 2.0 Full Speed Device/OTG | USB 2.0 Full Speed Device/OTG | USB 2.0 Full Speed Device/OTG | USB 2.0 Full Speed Device/OTG |
| CAN Controller | CAN 2.0B (ECAN) | CAN 2.0B (ECAN) | CAN 2.0B (ECAN) | CAN 2.0B (ECAN) |
| Data Flash | 1 KB | 1 KB | 1 KB | 1 KB |
Key Differentiators
- Extended -40C to +125C operation in a 28-pin SOIC (vs DSPIC33EP128MU502-I/SO)
- Integrated USB 2.0 full-speed device/OTG (vs DSPIC33EP128GP502-H/SO)
- Flash size scalability on the identical footprint (vs DSPIC33EP256MU502-E/SO)
Design Notes
The internal 2.5 V core regulator requires a 10 uF low-ESR capacitor (ceramic or tantalum) plus a 0.1 uF bypass on the VCAP/VDDCORE pin (pin 28). Estimated: core current is on the order of tens of mA at 70 MIPS, so a stable VCAP rail is essential - an undersized or high-ESR capacitor causes brown-out resets under load transients. Keep VUSB3V3 (pin 16) connected to a clean 3.3 V supply only when USB is used; otherwise the USB module can be left disabled with the pin tied per datasheet guidance.
Place the 0.1 uF decoupling capacitors within 2 mm of each VDD pin (pins 7 and 20) with short returns to VSS (pins 10 and 19). Route the USB D+/D- pair (pins 17/18) as a 90-ohm differential pair with matched lengths if USB full-speed operation is required; keep the pair away from PWM and gate-driver traces. Reserve a 5-pin ICSP header (MCLR, VDD, GND, PGD1, PGC1 on pins 1, 11, 12) for in-circuit programming and debugging.
All I/O is 3.3 V CMOS and not 5 V tolerant - level-shift any 5 V signals (legacy CAN transceivers, RS232 lines) before connecting to RPx pins. Peripheral Pin Select (PPS) must be explicitly locked after configuration (PPS unlock sequence) to prevent runaway remapping. Also note the E/SO extended grade is rated to +125C ambient but not AEC-Q100 qualified; automotive designs requiring qualification should verify Microchip automotive portfolio alternatives rather than assuming the E suffix implies automotive grade.
Compliance Information
RoHS compliance per standard Microchip active catalog offering; REACH, halogen-free and conflict-minerals status not stated in provided data - verify on the Microchip product page.
