DSPIC33EP128MU202T-I/SO - 16-bit DSC, 128KB Flash, USB | Microchip
MPN: DSPIC33EP128MU202T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.55 | $55.50 |
| 100 | $4.85 | $485.00 |
| 500 | $4.3 | $2,150.00 |
| 1,000 | $3.95 | $3,950.00 |
DSPIC33EP128MU202T-I/SO Overview
A Digital Signal Controller combines the compute architecture of a microcontroller with the fast interrupt handling and arithmetic capability of a DSP. Within the power management hierarchy of embedded systems, a DSC such as the dsPIC33 family sits above simple MCUs, adding hardware DSP multiply-accumulate (MAC) instructions that make it efficient for control loops, digital power conversion, and signal processing tasks.
Key features of this device include the 16-bit modified Harvard core at up to 70 MIPS from a 3.3V supply, dual on-chip user-programmable gain amplifiers and comparators, multiple 16-bit timers, and peripherals relevant to the MU (USB) subfamily: USB 2.0 full-speed device, multiple UART/SPI/I2C peripherals via Peripheral Pin Select (PPS), and a 12-bit ADC that supports motor control and digital power applications.
The dsPIC33EP series is fabricated to deliver deterministic interrupt latency and supports In-Circuit Serial Programming (ICSP) via the standard PICkit/MPLAB ICD toolchain in MPLAB X IDE. The extended family naming (EP) denotes enhanced peripherals and higher performance relative to the earlier dsPIC33F series.
Typical applications include digital power supplies and PFC stages, brushless DC and PMSM motor control, USB-connected sensor interfaces, audio signal processing, and industrial control panels where the 28-pin footprint and 128 KB flash provide code headroom.
A key design consideration: the VCAP/VDDCORE pin (pin 28) requires an external low-ESR capacitor per the manufacturer datasheet for internal core regulation stability; do not power this pin externally.
This page synthesizes distributor availability, same-package drop-in alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP128MU202T-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 DSPIC33EP128MU202T-I/SO (same form factor and footprint) — differing in Operating Temperature, Package, Communication Interfaces, Core Architecture, Qualification.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP256MU202T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP64MU202T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128GP502-H/SO
✅ Drop-In✓ In Stock
$3.36 / Unit
View Datasheet →DSPIC33EP128MC202T-E/MM
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.41 / Unit
View Datasheet →DSPIC33EP256GP502
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP32MU202
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC24EP128GC202
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128MU202T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit modified Harvard DSC |
| Max CPU Speed | 70 MIPS |
| Program Memory | 128 KB (44K x 24-bit words) Flash |
| Data Memory (RAM) | 16 KB |
| Supply Voltage Range | 3.0 V to 3.6 V |
| USB | USB 2.0 Full-Speed Device |
| ADC Resolution | 12-bit |
| Peripheral Pin Select (PPS) | Yes |
| Communication Interfaces | UART, SPI, I2C (mapped via PPS) |
| Timers | Multiple 16-bit timers (including Timer1, Timer2/3, Timer4/5) |
| Comparators | 2 on-chip comparators with programmable gain amplifiers |
| Operating Temperature | -40C to +85C (I grade) |
| Package | 28-pin SOIC (SOIC-W, 300 mil) |
| Mounting Type | Surface Mount |
| Programming Interface | ICSP (2-wire PGD/PGC) |
| Standard Package Quantity | 1600 (Tape & Reel) |
| RoHS Status | Compliant |
| Device Series | dsPIC33EP128MU202 |
DSPIC33EP128MU202T-I/SO Pin Configuration
| Pin 1 | MCLR — Master clear (reset) input, active low; programming voltage pin |
| Pin 2 | AN0/C1IN-/C2IN+/RB0 — Analog input 0, comparator inputs, digital I/O port B bit 0 |
| Pin 3 | AN1/C1IN+/C2IN-/RB1 — Analog input 1, comparator inputs, digital I/O port B bit 1 |
| Pin 4 | PGD/AN2/RB2 — ICSP programming data, analog input 2, digital I/O port B bit 2 |
| Pin 5 | PGC/AN3/RB3 — ICSP programming clock, analog input 3, digital I/O port B bit 3 |
| Pin 6 | AN4/RB4 — Analog input 4, digital I/O port B bit 4 |
| Pin 7 | VDD — Positive supply (3.0 V to 3.6 V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA2 — Crystal oscillator input or external clock input, port A bit 2 |
| Pin 10 | OSC2/CLKO/RA3 — Crystal oscillator output or clock output, port A bit 3 |
| Pin 11 | AN5/RC0 — Analog input 5, remappable peripheral pin (RP32), digital I/O |
| Pin 12 | AN6/RC1 — Analog input 6, remappable peripheral pin (RP33), digital I/O |
| Pin 13 | AN7/RC2 — Analog input 7, remappable peripheral pin (RP34), digital I/O |
| Pin 14 | VSS — Ground reference |
| Pin 15 | VDD — Positive supply |
| Pin 16 | SOSCI/RC3 — Secondary oscillator input, remappable peripheral pin (RP35), digital I/O |
| Pin 17 | SOSCO/RC4 — Secondary oscillator output, remappable peripheral pin (RP36), digital I/O |
| Pin 18 | AN8/RC5 — Analog input 8, remappable peripheral pin (RP37), digital I/O |
| Pin 19 | AN9/RC6 — Analog input 9, remappable peripheral pin (RP38), digital I/O |
| Pin 20 | AN10/RC7 — Analog input 10, remappable peripheral pin (RP39), digital I/O |
| Pin 21 | AN11/INT0/RC8 — Analog input 11, external interrupt 0, remappable peripheral pin (RP40) |
| Pin 22 | AN12/RC9 — Analog input 12, remappable peripheral pin (RP41), digital I/O |
| Pin 23 | AN13/RTCC/RB5 — Analog input 13, RTCC remap, digital I/O port B bit 5 |
| Pin 24 | AN14/RB6 — Analog input 14, digital I/O port B bit 6 |
| Pin 25 | AN15/RB7 — Analog input 15, digital I/O port B bit 7 |
| Pin 26 | AVDD — Analog supply for ADC (connect to VDD) |
| Pin 27 | AVSS — Analog ground for ADC (connect to VSS) |
| Pin 28 | VCAP/VDDCORE — Internal core regulator output; connect low-ESR 10 uF capacitor to VSS |
Typical Applications
DSPIC33EP128MU202T-I/SO is suitable for 6 applications: Digital Power Supplies and PFC, Brushless DC and PMSM Motor Control, USB-Connected Sensor and Data Acquisition Interfaces, Industrial Control Panels and HMI Nodes, Audio Signal Processing, IoT Sensor Nodes and Smart Devices.
Digital Power Supplies and PFC
The DSPIC33EP128MU202T-I/SO fits digital power applications because its 70 MIPS core executes single-cycle DSP multiply-accumulate instructions, enabling current-loop bandwidths sufficient for LLC converters, PFC stages, and DC-DC bricks at switching frequencies well into the hundreds of kHz. The integrated 12-bit ADC with flexible trigger sources synchronizes sampling to the PWM period, reducing jitter-induced noise in the control loop. On-chip comparators with programmable gain amplifiers provide cycle-by-cycle current limiting without external circuitry. Typical topology places the DSC between voltage/current sense dividers and a gate-driver such as the MIC4102 or TC4427; unlike fixed-function analog controllers, the digital controller allows firmware-based soft-start, phase management, and telemetry over USB or UART. Designers should budget interrupt latency carefully and keep the control ISR short to preserve loop stability margins.
Recommended
Brushless DC and PMSM Motor Control
For BLDC and PMSM drives, the DSPIC33EP128MU202T-I/SO offers a proven FOC (Field-Oriented Control) platform: the 70 MIPS DSP core handles Clarke/Park transforms and PI current loops at several kHz update rates, while the 12-bit ADC reads phase currents from shunt resistors. The MU202 subfamily supports complementary PWM-capable outputs via PPS mapping, and the built-in comparators provide hardware overcurrent trip protection that responds faster than any firmware loop. For applications needing the full complementary PWM output module with dead-time control, the pin-compatible DSPIC33EP128MC202 is the recommended same-footprint variant. A typical drive pairs this DSC with an IR2101 gate driver and a three-phase inverter stage; the USB peripheral adds field-updatable firmware and production test access. Commutation tables and PI gains can be tuned live over USB using the Microchip Motor Control GUI tools.
Recommended
USB-Connected Sensor and Data Acquisition Interfaces
The integrated USB 2.0 full-speed device peripheral makes the DSPIC33EP128MU202T-I/SO a compact single-chip bridge between analog sensors and a host PC. The 12-bit ADC digitizes sensor channels while the USB stack - built on the free Microchip USB Device framework in MPLAB Harmony - presents the device as a CDC virtual COM port or HID device with no external USB interface chip. Compared with an MCU-plus-USB-bridge two-chip solution, this saves board area and BOM cost in the 28-pin SOIC footprint. Typical uses include lab bench instrumentation, weigh-scale front ends, and environmental monitoring nodes logging to a host. The 128 KB flash accommodates a bootloader plus a full USB and acquisition stack with room to spare, and the PPS peripheral pin select lets designers route ADC and communication functions to the most convenient package pins for a clean two-layer PCB layout.
Recommended
Industrial Control Panels and HMI Nodes
In industrial panels, the DSPIC33EP128MU202T-I/SO serves as a smart control node handling sensor polling, relay sequencing, and communication back to a PLC or SCADA master. The -40C to +85C industrial temperature grade suits factory environments, and the 70 MIPS core runs PID loops for process control with deterministic latency. Multiple UART, SPI, and I2C instances mapped through Peripheral Pin Select allow RS-485 (via a transceiver such as the TCAN1051 or MCP2561-class devices on CAN designs), displays, and memory expansion to coexist on the same 28-pin package. The industrial I-grade part is not automotive AEC-Q100 qualified, so it should be specified for factory automation rather than under-hood use. Non-volatile parameter storage uses the on-chip flash self-programming feature, eliminating external EEPROM in many designs and reducing BOM cost.
Recommended
Audio Signal Processing
The DSP multiply-accumulate instruction set of the DSPIC33EP128MU202T-I/SO executes FIR and IIR filters, level meters, and tone-generation routines at sample rates typical of consumer audio interconnects and intercom systems. The 12-bit ADC handles microphone or line-level inputs after simple biasing, and a filtered PWM output can serve as a budget DAC for speaker driving through a low-pass filter, or an external MCP4922 SPI DAC can be added for higher fidelity. With 128 KB flash, the device stores full DSP libraries plus a communication stack. Typical deployments include conference-room intercom controllers, active noise-cancellation prototypes, and sound-reactive lighting controllers where USB enables preset upload from a host PC. Designers should keep sample ISR cycles under budget - at 48 kHz sampling, roughly 1458 core cycles per sample at 70 MIPS - and verify filter cycle counts with the XC16 DSP library profiling tools.
Recommended
IoT Sensor Nodes and Smart Devices
For connected devices, the DSPIC33EP128MU202T-I/SO pairs its USB device port with UART-based links to Wi-Fi or BLE modules such as the RN4871 or ESP8266-class parts, forming a gateway between local sensors and wireless networks. The PPS feature routes communication functions to any of the RP-mapped pins, easing routing in dense layouts, while the industrial temperature rating and low-power modes (Sleep and Idle) support mains-powered smart appliances and portable instruments alike. The 128 KB flash typically holds the application, a USB update path, and the wireless module AT-command handling with margin for OTA-related buffers. Products in this space include smart chargers, environmental stations, and appliance control boards where a USB service port doubles as the production programming interface, removing an extra programming connector from the PCB and simplifying both manufacturing and end-user firmware updates.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128MU202T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256MU202T-I/SO | DSPIC33EP128GP502-H/SO | DSPIC33EP128MC202 | DSPIC33EP64MU202T-I/SO |
|---|---|---|---|---|---|
| Package | 28-pin SOIC-W | 28-pin SOIC-W - same | 28-pin SOIC-W - same | 28-pin SOIC-W - same | 28-pin SOIC-W - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 256 KB | 128 KB | 128 KB | 64 KB |
| RAM | 16 KB | 24 KB | 16 KB | 16 KB | 8 KB |
| USB Device Peripheral | Yes (USB 2.0 Full-Speed) | Yes | No (GP subfamily) | No (MC subfamily) | Yes |
| Max CPU Speed | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Operating Temperature | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C | -40C to +85C (I grade) | -40C to +85C (I grade) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Peripheral Pin Select (PPS) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated USB 2.0 full-speed device in a 28-pin SOIC (vs DSPIC33EP128GP502-H/SO)
- Larger code and data headroom at the same pinout (vs DSPIC33EP64MU202T-I/SO)
- DSP MAC instructions for control-loop compute (vs PIC24EP128GC202)
- Trade-off: motor-control PWM module (vs DSPIC33EP128MC202)
Design Notes
The on-chip core regulator requires a low-ESR 10 uF ceramic capacitor on the VCAP/VDDCORE pin (pin 28), placed within a few millimeters of the pin with a short, direct path to VSS. Do not drive VCAP from an external source, and do not share this capacitor with other loads. Erratic resets or failure to boot are most often traced to a missing, undersized, or high-ESR VCAP capacitor. During power-up, ensure the 3.3V rail ramps monotonically; brown-out configuration bits should be enabled for reliability on shared supplies.
Provide separate analog supply decoupling for AVDD/AVSS: connect AVDD to VDD through a ferrite bead or direct trace, and add 100 nF close to pins 26/27. Keep the analog ground return for AVSS free of digital switching currents (USB transceiver, clock lines) to preserve 12-bit ADC accuracy. Because PPS lets you move peripherals to any RP pin, route first and assign pins last - this eliminates crossing traces for UART/SPI connections in single-layer routing of a two-layer board.
The USB 2.0 full-speed D+/D- pair should be routed as a 90-ohm controlled-impedance differential pair with matched lengths where possible, even on low-cost two-layer boards; keep the pair short and away from switching nodes of power stages. Add a 1.5 kOhm pull-up consideration per the USB device framework (the internal pull-up is handled by the peripheral). For crystal operation, keep OSC1/OSC2 traces short with guard ground, and place 0.1 uF on every VDD pin (pins 7 and 15) as close as physically possible.
Pins 4 and 5 (PGD/PGC) double as analog inputs AN2/AN3; leave them routable to a programming header, and avoid assigning them to high-current or high-noise circuit nodes that would corrupt ICSP. Do not use MCLR as a general input without disabling the MCLR function in configuration bits, and remember the internal primary oscillator versus FRC selection in config affects boot behavior. When substituting MU/GP/MC subfamily parts on the same footprint, verify peripheral register maps - the USB block exists only on MU parts.
Compliance Information
RoHS-compliant standard Microchip product. Industrial (I) temperature grade; not AEC-Q100 automotive qualified. REACH and halogen-free status not stated in the provided web data - consult Microchip's official material declaration for confirmation.
