DSPIC33EP128MU202-I/SO - 70MIPS 128KB DSC, USB | Microchip
MPN: DSPIC33EP128MU202-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.15 | $515.00 |
| 500 | $4.72 | $2,360.00 |
| 1,000 | $4.31 | $4,310.00 |
DSPIC33EP128MU202-I/SO Overview
A digital signal controller is a hybrid device that merges the computational horsepower of a digital signal processor (MAC operations, DSP instructions, circular addressing) with the peripheral integration and ease of use of a microcontroller. In the power-management hierarchy, DSCs sit above general-purpose MCUs and below multi-core DSPs, making them the preferred choice for closed-loop control systems that need real-time math and rich peripherals on a single chip.
Key features include the 70 MIPS dsPIC33E core with single-cycle MAC and 40-bit accumulator, 128 KB Flash with self-programming capability, 16 KB RAM, a 12-bit 1.1 Msps ADC with up to 10 input channels, and the USB 2.0 full-speed module that eliminates an external USB interface chip. Multiple UART, SPI, and I2C peripherals plus flexible peripheral pin select (PPS) allow digital remapping of I/O, simplifying PCB routing.
The dsPIC33EP architecture uses an enhanced Harvard bus structure with separate program and data paths, hardware loop support, and dual operand fetch for efficient FIR/IIR filtering. The 12-bit ADC can be synchronized to PWM modules via triggers, enabling precise current-sense sampling in digital power and motor control loops. Programmable PLL from the internal FRC or external crystal yields flexible clocking up to 70 MIPS.
Typical applications include USB-connected sensor hubs, battery charging and digital power supplies, BLDC/PMSM motor control, and portable instrumentation. The integrated USB makes it especially attractive for devices that must communicate with PCs without a separate USB bridge.
Design consideration: the dsPIC33E core requires a VCAP/VDDCORE capacitor (typically a low-ESR 10 uF) for the internal 2.5V regulator - omitting it or using an unstable capacitor is a common cause of boot failures.
This page synthesizes distributor pricing, drop-in same-family alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP128MU202-I/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 DSPIC33EP128MU202-I/SO (same form factor and footprint) — differing in Package, Operating Temperature, Core, Program Memory (Flash), RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP128GP502-H/SO
✅ Drop-In✓ In Stock
$3.36 / Unit
View Datasheet →DSPIC33EP256MU202-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP64MU202-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP32MU202-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128MC202-I/MM
✅ Drop-In✓ In Stock
$4.9 / Unit
View Datasheet →DSPIC33EP128MU202-I/SO Maximum Ratings & Electrical Characteristics
| Core | dsPIC33E 16-bit DSC |
| Max CPU Speed | 70 MIPS |
| Program Memory (Flash) | 128 KB |
| RAM | 16 KB |
| ADC Resolution | 12 bit |
| ADC Sampling Rate | 1.1 Msps |
| USB | USB 2.0 Full-Speed device/OTG |
| Communication Interfaces | USB, UART, SPI, I2C |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40C to +85C |
| Package | SOIC-28 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
DSPIC33EP128MU202-I/SO Pin Configuration
| Pin 1 | MCLR — Master clear reset (active low), programming voltage input |
| Pin 2 | AN0/CN2/RB0 — Analog input 0 / change notification / port B bit 0 |
| Pin 3 | AN1/CN3/RB1 — Analog input 1 / change notification / port B bit 1 |
| Pin 4 | AN2/SS1/CN4/RB2 — Analog input 2 / SPI slave select / port B bit 2 |
| Pin 5 | AN3/CN5/RB3 — Analog input 3 / port B bit 3 |
| Pin 6 | VSS — Ground reference |
| Pin 7 | OSC1/CLKI — Crystal oscillator input / external clock input |
| Pin 8 | OSC2/CLKO — Crystal oscillator output / clock output |
| Pin 9 | AN4/RB4 — Analog input 4 / port B bit 4 |
| Pin 10 | AN5/RB5 — Analog input 5 / port B bit 5 |
| Pin 11 | PGD/AN6/RB6 — Programming data / analog input 6 / port B bit 6 |
| Pin 12 | PGC/AN7/RB7 — Programming clock / analog input 7 / port B bit 7 |
| Pin 13 | VDD — Power supply (3.0 V to 3.6 V) |
| Pin 14 | AN8/RB8 — Analog input 8 / port B bit 8 |
| Pin 15 | AN9/RB9 — Analog input 9 / port B bit 9 |
| Pin 16 | AN10/RB10 — Analog input 10 / port B bit 10 |
| Pin 17 | AN11/RB11 — Analog input 11 / port B bit 11 |
| Pin 18 | AN12/RB12 — Analog input 12 / port B bit 12 |
| Pin 19 | AN13/RB13 — Analog input 13 / port B bit 13 |
| Pin 20 | AN14/RB14 — Analog input 14 / port B bit 14 |
| Pin 21 | AN15/RB15 — Analog input 15 / port B bit 15 |
| Pin 22 | VSS — Ground reference |
| Pin 23 | U1D-/RP — USB data minus (peripheral pin select capable pin) |
| Pin 24 | U1D+/RP — USB data plus (peripheral pin select capable pin) |
| Pin 25 | RP20/SDA1 — Remappable pin / I2C data 1 |
| Pin 26 | RP21/SCL1 — Remappable pin / I2C clock 1 |
| Pin 27 | VCAP/VDDCORE — Internal core regulator capacitor connection |
| Pin 28 | AVDD/AVSS region via VDD — See datasheet - analog power/ground and remaining remappable pins |
Typical Applications
DSPIC33EP128MU202-I/SO is suitable for 6 applications: USB-Connected Sensor Hubs, BLDC / PMSM Motor Control, Digital Power Supplies (AC-DC / DC-DC), Battery Charging Systems, Portable Instrumentation, Industrial Automation Nodes.
USB-Connected Sensor Hubs
The integrated USB 2.0 full-speed module of the DSPIC33EP128MU202-I/SO eliminates an external USB bridge chip, allowing sensors to stream data directly to a PC host over CDC or HID classes. The 70 MIPS core performs filtering (FIR/IIR with single-cycle MAC) on sensor data before transmission, reducing host-side processing. The 12-bit 1.1 Msps ADC digitizes analog sensor outputs, while DMA offloads USB endpoint buffer management from the CPU. With 128 KB Flash, complex USB stacks plus application code fit comfortably. Place the device within 2.54 cm of the USB connector with series termination on D+/D- to maintain signal integrity at full-speed 12 Mbps rates.
Recommended
BLDC / PMSM Motor Control
The 70 MIPS dsPIC33E core with hardware DSP MAC executes field-oriented control (FOC) loops well beyond the 10-20 kHz PWM frequencies typical of brushless motor drives. The 12-bit ADC samples phase currents triggered by PWM events for minimum offset error, and PWM modules generate center-aligned complementary outputs with dead-time insertion. According to Microchip, the dsPIC33E family enables high-performance, precision, energy-efficient, and quieter motor control for BLDC and permanent-magnet motors. The 28-pin SOIC fits compact driver boards; allocate two PWM outputs per phase and reserve an ADC channel for the bus-voltage sense divider.
Recommended
Digital Power Supplies (AC-DC / DC-DC)
Digital power loops benefit from the deterministic 70 MIPS core, PWM-triggered ADC sampling, and software-defined compensation of the DSPIC33EP128MU202-I/SO. The controller implements voltage-mode or average-current-mode control in software, allowing adaptive tuning across load ranges that fixed analog compensators cannot match. The 1.1 Msps ADC captures transient events at microsecond resolution, and the internal 2.5V core regulator simplifies the 3.3 V supply tree. Reserve the UART or I2C peripheral for PMBus-style telemetry to a host. Keep the analog ground plane for ADC inputs separate from PWM switching grounds to preserve the 12-bit noise floor.
Recommended
Battery Charging Systems
Smart battery chargers need closed-loop current/voltage control plus host reporting - exactly the combination the DSPIC33EP128MU202-I/SO provides with its 12-bit ADC, PWM-based power stage control, and USB port for PC configuration tools. The 70 MIPS core runs multi-phase charging state machines and coulomb-counting math concurrently, while 16 KB RAM buffers charge-profile logs. The 128 KB Flash stores multiple chemistry profiles (Li-ion, lead-acid, NiMH) selectable at runtime. The -40C to +85C industrial temperature grade supports outdoor EVSE accessories and solar charge controllers; apply conformal coating and derate maximum junction by 20C in sealed enclosures.
Recommended
Portable Instrumentation
Handheld meters and data loggers exploit the 1.1 Msps 12-bit ADC for waveform capture, USB for data upload, and the low-power idle modes of the dsPIC33E core for battery conservation. The 70 MIPS throughput executes true-RMS, FFT, and windowing math on-device, displaying results on low-cost displays via SPI or I2C. The 28-pin SOIC keeps PCB area small enough for pocket-form-factor designs, and the 128 KB Flash retains calibration tables and logging firmware. Trigger the ADC synchronously with a timer for coherent sampling; the peripheral pin select lets routing place the display bus away from the analog front end to protect measurement accuracy.
Recommended
Industrial Automation Nodes
In factory nodes, the DSPIC33EP128MU202-I/SO serves as an intelligent actuator or sensor controller: its UART/SPI/I2C peripherals interface PLC I/O, the 12-bit ADC reads 4-20 mA loops via a sense resistor, and the industrial -40C to +85C rating survives panel environments. The 70 MIPS DSP engine handles vibration-signature or power-quality analytics locally, escalating only exceptions over USB or serial links to supervisory systems. The 128 KB Flash supports field firmware updates, and peripheral pin select remaps pins so one PCB serves multiple product variants. Enforce watchdog supervision and CRC-checked firmware images for environments where unattended recovery is impossible.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128MU202-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP128GP502-H/SO | DSPIC33EP256MU202-I/SO | DSPIC33EP64MU202-I/SO | DSPIC33EP32MU202-I/SO | DSPIC33EP128MC202-I/MM |
|---|---|---|---|---|---|---|
| Package | SOIC-28 | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | QFN-28 - different land pattern |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 256 KB | 64 KB | 32 KB | 128 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| Core Speed | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| USB 2.0 Peripheral | Yes (full-speed) | No | Yes (full-speed) | Yes (full-speed) | Yes (full-speed) | No |
Key Differentiators
- Integrated USB 2.0 full-speed device/OTG (vs DSPIC33EP128GP502-H/SO)
- 128 KB Flash headroom for USB stacks + application (vs DSPIC33EP64MU202-I/SO)
- Surface-mount SOIC-28 footprint (vs DSPIC33EP128MU202-I/SP)
Design Notes
The dsPIC33E internal regulator requires a low-ESR ceramic capacitor (typically 10 uF) on the VCAP/VDDCORE pin; check the datasheet ESR window because out-of-range ESR destabilizes the 2.5V core supply and is a leading cause of no-boot returns. Decouple each VDD pin with 0.1 uF ceramics placed within 3 mm of the pin plus one bulk 4.7-10 uF capacitor per device. AVDD should be filtered through an RC (e.g., 10 ohm + 1 uF) from the digital rail for best ADC noise performance.
For the USB 2.0 full-speed interface, route D+ and D- as a 90-ohm differential pair matched to within 1-2 mm, keep total length under 20 cm, and avoid routing under switching loads or crystals. Place a common-mode choke and ESD array at the connector if the cable is user-accessible. Use the internal PLL from an external crystal rather than the internal FRC oscillator when USB accuracy class compliance matters, since full-speed USB needs a precise 48 MHz source.
Config-word settings (OSC, WDT, code protection) are stored in Flash and are erased during full-chip erase - always set them in source code, not only via the programmer GUI, or production units may boot from the wrong oscillator. Keep MCLR pulled up through a 10k resistor for field reliability, and remember PPS (peripheral pin select) must be explicitly unlocked/locked (with a sequence) when remapping RP pins; forgetting to lock leaves mappings vulnerable to stray writes.
Estimated: at 70 MIPS with all peripherals active, core current is on the order of tens of mA at 3.3 V, giving power dissipation of roughly 100-200 mW - the SOIC-28 theta_JA of approximately 70-100 C/W yields only a 7-20 C junction rise at 25C ambient, so heatsinking is unnecessary. Verify against the datasheet current-consumption tables for your actual clock and peripheral configuration.
Compliance Information
RoHS compliance per standard Microchip commercial-grade offering; REACH and conflict-mineral declarations were not present in the provided data.
