DSPIC33EP128MC502-I/SS - 70 MIPS 16-bit DSC 128KB Flash | Microchip
MPN: DSPIC33EP128MC502-I/SS β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.66 | $3.66 |
| 10 | $3.3 | $33.00 |
| 100 | $3 | $300.00 |
| 500 | $2.75 | $1,375.00 |
| 1,000 | $2.55 | $2,550.00 |
DSPIC33EP128MC502-I/SS Overview
A digital signal controller combines the computational throughput of a digital signal processor with the deterministic control architecture and peripheral set of a microcontroller. Within the embedded control hierarchy (DSC -> microcontroller -> MCU/SoC -> semiconductor), dsPIC33E DSCs sit at the intersection of real-time signal processing and closed-loop power/motor control, executing DSP multiply-accumulate instructions and fast interrupts while bit-banging-free peripherals handle PWM generation, quadrature encoding, and communications.
Key differentiating features include the 70 MIPS (up to 60 MHz external clock) modified Harvard dsPIC33E core, 3.3V single-supply operation, integrated MCPWM for high-speed motor control with complementary outputs and dead-time insertion, on-chip operational amplifiers and comparators that reduce external analog component count in current-sense loops, and an CAN module for industrial network connectivity.
Architecturally, the dsPIC33EP128MC502 uses a 16-bit modified Harvard pipeline with DSP engine support, IEEE 1149.2 compatible (JTAG) boundary scan, two program and two complex data breakpoints, and in-circuit (ICSP) and in-application programming. The peripheral trigger generator (PTG) orchestrates peripheral-level sequencing with minimal CPU intervention, freeing headroom for control-law computation.
Typical applications span precision brushless DC and PMSM motor drives (sensorless and sensored FOC), switched-mode and resonant power converters, digital UPS and solar inverter platforms, and industrial control nodes where the CAN interface plus PWM precision are required in a compact 28-pin footprint.
For design-in, note that 3.0V to 3.6V supply tolerance requires a clean 3.3V rail, and the PGECx/PGEDx programming pair selected at layout time must be kept as a matched pair for ICSP/ICD. The operating temperature range of this industrial-grade -I device stops at +85C; select the -E extended variant for +125C environments.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing comparative selection data beyond the standard product listing.
Drop-in alternatives for DSPIC33EP128MC502-I/SS β 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 DSPIC33EP128MC502-I/SS (same form factor and footprint) β differing in Operating Temperature, Package, Comparators, Core, Maximum CPU Speed.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
DSPIC33EP256MC502-I/SS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
DSPIC33EP64MC502-I/SS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
DSPIC33EP128MC202-I/SS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
DSPIC33EP128MC502-E/SS
β Drop-Inπ Reference alternative (not in catalog)
DSPIC33CK64MC102-I/SS
β Drop-Inβ In Stock
$1.74 / Unit
View Datasheet βDSPIC33CK32MC102T-I/2N
β Drop-Inβ In Stock
Contact for price
View Datasheet βDSPIC33EP128MC502-I/SS Maximum Ratings & Electrical Characteristics
| Core | dsPIC33E 16-bit DSC |
| Maximum CPU Speed | 70 MIPS (60 MHz clock) |
| Program Memory (FLASH) | 128 KB (43K x 24) |
| RAM | 16 KB |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40C to +85C (I grade) |
| Package | 28-SSOP (SS) |
| Mounting Type | Surface Mount |
| PWM Module | MCPWM (motor control PWM) |
| Integrated Op-Amps | Yes |
| Comparators | Yes |
| CAN | Yes |
| PTG (Peripheral Trigger Generator) | Yes |
| Debug Interface | ICSP/ICD, IEEE 1149.2 compatible (JTAG) boundary scan |
| Breakpoints | 2 program and 2 complex data breakpoints |
| Programming Support | NSDSP-1/2/3 supported, multiple PGECx/PGEDx pairs |
| RoHS Status | Compliant |
DSPIC33EP128MC502-I/SS Pin Configuration
| Pin 1 | MCLR β Master clear reset (active low) / programming voltage input |
| Pin 2 | AN0/VREF+/CN2/RB0 β Analog input 0 / positive voltage reference |
| Pin 3 | AN1/VREF-/CN3/RB1 β Analog input 1 / negative voltage reference |
| Pin 4 | AN2/SS1/CN4/RB2 β Analog input 2 / SPI slave select 1 |
| Pin 5 | AN3/INDX/CN5/RB3 β Analog input 3 / quadrature encoder index |
| Pin 6 | AN4/QEA/IC7/CN6/RB4 β Analog input 4 / quadrature encoder A / input capture 7 |
| Pin 7 | VDD β Logic power supply (3.0 V to 3.6 V) |
| Pin 8 | VSS β Logic ground |
| Pin 9 | OSC1/CLKI/CN12/RA2 β Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKO/CN13/RA3 β Oscillator crystal output / clock output |
| Pin 11 | AN5/QEB/IC8/CN7/RB5 β Analog input 5 / quadrature encoder B / input capture 8 |
| Pin 12 | TMS β JTAG test mode select |
| Pin 13 | TCK β JTAG test clock |
| Pin 14 | TDI β JTAG test data input |
| Pin 15 | TDO β JTAG test data output |
| Pin 16 | PGEC3/AN6/OC1/FLT1/CN8/RB6 β Programming clock pair 3 / analog input 6 / output compare 1 / PWM fault 1 |
| Pin 17 | PGED3/AN7/OC2/FLT2/CN9/RB7 β Programming data pair 3 / analog input 7 / output compare 2 / PWM fault 2 |
| Pin 18 | PGEC2/AN8/C1IN-/CMP1/CN10/RB8 β Programming clock pair 2 / comparator 1 inverting input / analog input 8 |
| Pin 19 | PGED2/AN9/C1IN+/CMP2/CN11/RB9 β Programming data pair 2 / comparator 1 non-inverting input / analog input 9 |
| Pin 20 | PGEC1/AN10/CVREF/RTCC/RPA2/CN14/RB10 β Programming clock pair 1 (primary ICSP clock) / analog input 10 / comparator voltage reference |
| Pin 21 | PGED1/AN11/RPA3/CN15/RB11 β Programming data pair 1 (primary ICSP data) / analog input 11 |
| Pin 22 | AN12/RP18/T2CK/SDA2/SCL2/RC2 β Analog input 12 / remappable peripheral pin / Timer 2 external clock / I2C2 data-clock |
| Pin 23 | RP17/T1CK/RC3 β Remappable peripheral pin / Timer 1 external clock |
| Pin 24 | RP16/T4CK/SDA1/SCL1/RC4 β Remappable peripheral pin / Timer 4 external clock / I2C1 data-clock |
| Pin 25 | RP15/SCL1/SDA1/RC5 β Remappable peripheral pin / I2C1 clock-data |
| Pin 26 | AVSS β Analog ground |
| Pin 27 | AVDD β Analog power supply |
| Pin 28 | VDD β Logic power supply |
Typical Applications
DSPIC33EP128MC502-I/SS is suitable for 6 applications: BLDC / PMSM Motor Control, Digital Power Conversion, Industrial CAN Networking Nodes, Solar Inverters and MPPT, Embedded Control and Sensing Systems, Battery Management and Charging.
BLDC / PMSM Motor Control
The DSPIC33EP128MC502-I/SS is engineered for precision brushless DC and permanent-magnet synchronous motor drives. Its MCPWM module generates complementary PWM pairs with programmable dead-time, while on-chip op-amps amplify shunt-resistor current feedback without external components, and comparators provide cycle-by-cycle overcurrent protection. The 70 MIPS core executes sensorless or sensored field-oriented control (FOC) loops deterministically, and QEA/QEB quadrature-encoder pins support servo positioning. Placed between the gate-driver stage and current-sense dividers, the controller closes current loops at tens of kHz; the trade-off versus larger 100-pin family members is reduced PWM channel count, which suits single-motor drives in fans, pumps, power tools, and e-mobility subsystems.
Recommended
Digital Power Conversion
In switched-mode power supplies, LLC resonant converters, and digital UPS platforms, the DSPIC33EP128MC502-I/SS provides the PWM resolution and analog integration needed for closed-loop power conversion. The MCPWM module with dead-time insertion drives half-bridge topologies, the comparators implement fast cycle-by-cycle current limiting independent of CPU load, and the PTG (peripheral trigger generator) sequences ADC sampling to PWM edges with nanosecond-class alignment, minimizing control-loop delay. The 70 MIPS core executes voltage/current compensation laws while the CAN interface reports telemetry in industrial power systems. The trade-off is that designers must budget firmware complexity against a single-core architecture rather than dual-core dsPIC33CH parts used in very high-frequency converters.
Recommended
Industrial CAN Networking Nodes
With an integrated CAN module, the DSPIC33EP128MC502-I/SS serves as an intelligent node on industrial CAN 2.0 networks such as those used in factory automation, building control, and agricultural equipment. The 70 MIPS core handles protocol stacks and local control concurrently, while the MCPWM and op-amps drive local actuators and sense feedback without external analog front-ends. The PTG offloads repetitive trigger sequences from the CPU, preserving bandwidth for network responsiveness. Operated from a clean 3.3V rail within the -40C to +85C industrial range, the 28-SSOP footprint integrates a complete sensor-actuator-network node in minimal board area; for higher-node-density designs, consider pin-compatible memory up/down variants to right-size firmware storage.
Recommended
Solar Inverters and MPPT
Solar micro-inverters and MPPT charge controllers benefit from the DSPIC33EP128MC502-I/SS combination of high-resolution MCPWM outputs for DC-DC and DC-AC stages, comparators for fast protection, and the 70 MIPS DSP engine for maximum-power-point-tracking algorithms. The PTG synchronizes ADC conversions with PWM switching events, which is essential for accurate averaged current measurement in switching converters. The CAN interface connects the controller to system-level energy management in string architectures. Designers should note the 3.0V to 3.6V supply requirement and -40C to +85C operating range when locating the controller near hot power stages; the extended-temperature -E variant is available for thermally aggressive enclosures.
Recommended
Embedded Control and Sensing Systems
As a general embedded controller, the DSPIC33EP128MC502-I/SS couples DSP-grade arithmetic with rich analog integration, making it effective for sensor conditioning, precision measurement, and data-acquisition nodes. The on-chip op-amps and comparators form signal-conditioning front ends for thermistors, pressure bridges, and current sensors, while the 128 KB FLASH accommodates filtering, calibration, and communication firmware. The IEEE 1149.2 compatible (JTAG) boundary scan supports production test, and ICSP via the PGECx/PGEDx pairs enables field firmware updates. Compared with a general-purpose PIC16/PIC24 MCU, the DSC delivers an order-of-magnitude faster control-loop capability; the trade-off is a 3.3V-only supply typical of the dsPIC33E family.
Recommended
Battery Management and Charging
Battery chargers and battery-management units exploit the DSPIC33EP128MC502-I/SS MCPWM module for synchronous buck charge stages, with dead-time control protecting the external MOSFET bridge. The comparators implement hardware overcurrent and overvoltage responses faster than software could, and the op-amps condition cell-voltage and current-sense signals directly, reducing BOM cost in multi-cell systems. The 70 MIPS core runs state-of-charge estimation and charge-state machines while CAN communications coordinate the charger within larger packs or vehicles. Design considerations include the 3.3V logic supply isolation from battery-domain circuitry and honoring the -40C to +85C industrial rating; the 28-SSOP package keeps controller footprint small on dense charger PCBs.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128MC502-I/SS β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256MC502-I/SS | DSPIC33EP64MC502-I/SS | DSPIC33EP128MC202-I/SS | DSPIC33EP128MC502-E/SS | DSPIC33CK64MC102-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Speed | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 100 MIPS (100 MHz dsPIC33CK core) |
| FLASH Memory | 128 KB | 256 KB | 64 KB | 128 KB | 128 KB | 64 KB |
| RAM | 16 KB | 32 KB | 8 KB | 16 KB | 16 KB | 8 KB |
| CAN Module | Yes | Yes | Yes | No | Yes | Yes (CAN FD) |
| Integrated Op-Amps | Yes | Yes | Yes | No | Yes | Yes (op-amp/comparator set differs) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Integrated CAN for industrial networking (vs DSPIC33EP128MC202-I/SS)
- Memory upsize without PCB rework (vs DSPIC33EP256MC502-I/SS)
- Extended-temperature headroom (vs DSPIC33EP128MC502-E/SS)
- Mature toolchain and lower migration risk (vs DSPIC33CK64MC102-I/SS)
Design Notes
The DSPIC33EP128MC502-I/SS provides multiple PGECx/PGEDx programming pairs (PGEC1/PGED1 on pins 20-21, PGEC2/PGED2 on pins 18-19, PGEC3/PGED3 on pins 16-17). Choose one pair at layout time and route it to a standard 5-pin ICSP header, keeping clock and data as a matched pair - per Microchip programming documentation, ICSPCLK and ICSPDAT must come from the same pair (e.g., PGEC2 with PGED2). Bring out MCLR (pin 1) with a 10k pull-up to 3.3V for reliable programming and reset behavior.
The device requires a 3.0V to 3.6V single supply; a well-regulated 3.3V LDO or buck output is recommended. Decouple each VDD pin (7 and 28) with 100 nF ceramics placed within 2 mm of the pins, plus bulk capacitance near the board entry point. Keep AVDD (pin 27) on a clean analog rail - use an RC or ferrite filter from the digital 3.3V rail to preserve op-amp, comparator, and ADC accuracy for current-sense loops in motor-control designs.
The -I temperature suffix stops at +85C; designs reaching +125C (e.g., sealed motor housings or inverter enclosures) must specify the -E extended-temperature variant instead. Also verify pin-function allocation early: peripheral remappable pins (RPxx) allow flexible UART/SPI/PWM routing, but JTAG pins (12-15) and analog-capable pins are fixed, so confirm the pinout table before locking the PCB. When migrating from dsPIC33EP to dsPIC33CK, review per-pin peripheral mapping rather than assuming pin equivalence.
For motor-control and digital-power applications, minimize the loop area between the MCPWM output pins, gate drivers, and shunt resistors, and route current-sense feedback to the on-chip op-amp inputs (pins 18-19 region) as short differential traces guarded by ground. Place the crystal or external clock on OSC1/OSC2 (pins 9-10) with load capacitors directly adjacent to keep the oscillator stable under PWM-driven ground bounce.
Compliance Information
RoHS compliant per Microchip product listing and distributor data. Industrial-grade part; not automotive AEC-Q100 qualified. REACH and conflict-minerals status should be confirmed via Microchip's compliance portal for production procurement.
