DSPIC33FJ128GP708-I/PT - 16-bit DSC 40MIPS 128KB Flash | Microchip
MPN: DSPIC33FJ128GP708-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.32 | $8.32 |
| 10 | $7.55 | $75.50 |
| 100 | $6.68 | $668.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.64 | $5,640.00 |
DSPIC33FJ128GP708-I/PT Overview
A digital signal controller combines the computational core of a microcontroller with the math acceleration of a digital signal processor. In the power-management hierarchy, the dsPIC33F sits above general-purpose MCUs like the PIC18 and below multi-core application processors, filling the role of single-chip control for algorithms such as PID loops, digital filters, and FFTs. The dsPIC33FJ family shares seamless migration options with PIC24F MCUs and dsPIC30F DSCs.
Key features include a modified Harvard architecture with a 16-bit data path, a hardware DSP engine with a 17-bit x 17-bit single-cycle multiplier, dual 40-bit accumulators and a barrel shifter, and 40 MIPS peak throughput at an internal 40 MHz instruction clock (80 MHz oscillator via PLL). Peripherals cover a 10-bit 1.1 Msps ADC, multiple UART, SPI and I2C ports, input capture and output compare channels, and PWM outputs suited to motor control and digital power.
Technically, the device uses CMOS flash technology with 8192 words of data RAM, in-circuit serial programming (ICSP) via PGEC/PGED pin pairs, JTAG boundary scan, and brown-out and watchdog protection. Registers are shadowed for fast context switching, which reduces interrupt latency in real-time control loops.
Typical applications include brushless and induction motor drives, switch-mode power supplies and digital lighting ballasts, and embedded sensor processing where fixed-point DSP math is required without a separate DSP chip.
A key design consideration is the power rail: the dsPIC33FJ operates from a single 3.0V to 3.6V supply, with a core regulator controlled externally via the VDDCORE/VCAP pin, which requires a low-ESR capacitor placed close to the pin.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, with pricing verified as of 2026-09-26.
Drop-in alternatives for DSPIC33FJ128GP708-I/PT — 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 DSPIC33FJ128GP708-I/PT (same form factor and footprint) — differing in Operating Temperature, Package, Programming Interface, Core Architecture, Max CPU Speed.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ128GP708AT-E/PT
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33FJ256GP708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ64GP708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ128GP310T-I/PT
✅ Drop-In✓ In Stock
$5.46 / Unit
View Datasheet →DSPIC33FJ128GP706A-E/PT
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →DSPIC33FJ128GP708-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit modified Harvard, DSC |
| Max CPU Speed | 40 MIPS (40 MHz instruction clock) |
| Program Memory (Flash) | 128 KB |
| Data RAM | 16 KB (8192 words) |
| Supply Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40C to +85C |
| Package | 80-pin TQFP (PT), 12 x 12 mm |
| Mounting Type | Surface Mount |
| Multiplier | 17-bit x 17-bit single-cycle hardware DSP multiplier |
| Accumulators | Dual 40-bit |
| ADC | 10-bit, 1.1 Msps |
| Communication Interfaces | UART, SPI, I2C |
| Programming Interface | ICSP via PGEC/PGED pairs, JTAG boundary scan |
| Technology | CMOS Flash |
| Packaging Type | Tray |
DSPIC33FJ128GP708-I/PT 80-pin tqfp (pt), 12 x 12 mm Pin Configuration Guide
Pin configuration for DSPIC33FJ128GP708-I/PT (80-pin tqfp (pt), 12 x 12 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for DSPIC33FJ128GP708-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33FJ128GP708-I/PT is suitable for 6 applications: Brushless and Induction Motor Control, Switch-Mode Power Supplies and Digital Power, Sensor Signal Processing and Data Acquisition, Industrial Automation and Control Panels, Audio and Speech Processing, Automotive-Adjacent and Lighting Systems (Extended Temp Builds).
Brushless and Induction Motor Control
The DSPIC33FJ128GP708 fits motor control because its 40 MIPS core executes field-oriented control (FOC) loops with the single-cycle 17x17-bit hardware multiplier, while dual 40-bit accumulators absorb PI current-loop arithmetic without overflow. PWM outputs drive a three-phase inverter gate stage, and the 10-bit, 1.1 Msps ADC samples phase currents and the DC bus fast enough for 20 kHz switching frequencies with 10x oversampling. In a typical BLDC or PMSM drive the DSC runs the outer speed loop and inner current loops in the same interrupt, reading shunt or in-line current sense signals. Trade-off: the on-chip 10-bit ADC resolution is modest for position sensing, so high-precision drives pair it with an external resolver-to-digital converter.
Recommended
Switch-Mode Power Supplies and Digital Power
Digital power converters benefit from the dsPIC33FJ128GP708's deterministic single-cycle instructions and fast ADC: a 500 kHz peak-current-mode buck converter needs current feedback within a few microseconds, which the 1.1 Msps ADC meets with margin. Output-compare modules generate complementary PWM with dead time for half-bridge topologies, and the 40 MIPS DSP engine implements compensator difference equations (Type III or 2p2z) in fixed point. The device also handles housekeeping tasks such as PMBus-style communication over I2C and fault logging in its 128 KB Flash. Compared with an analog controller, this DSC adds programmability and telemetry; the trade-off is that firmware bugs affect safety, so watchdog and brown-out features must be enabled in production designs.
Recommended
Sensor Signal Processing and Data Acquisition
For embedded sensing, the DSPIC33FJ128GP708 combines a 10-bit 1.1 Msps ADC with DSP instructions for real-time FIR/IIR filtering, RMS computation, and FFT-based spectral analysis on the 40 MIPS core. The 16 KB RAM buffers several thousand 10-bit samples, sufficient for frame-based processing at audio-band and vibration-analysis rates, while UART and SPI ports stream results to a host or radio module. Because the DSC integrates math acceleration with general MCU peripherals (I2C sensors, UART telemetry), one chip replaces a separate MCU-plus-DSP pairing, reducing board area and BOM cost. Design consideration: fixed-point scaling requires care to avoid saturation in the 40-bit accumulators; Microchip's DSP library provides pre-tested filter and FFT routines to shorten development.
Recommended
Industrial Automation and Control Panels
In factory equipment, the DSPIC33FJ128GP708 acts as a local real-time controller: its multiple UART, SPI, and I2C ports link drives, sensors, and HMI panels, while the 40 MIPS core closes control loops deterministically. Industrial temperature rating (-40C to +85C), brown-out reset, watchdog timer, and JTAG boundary scan support reliable operation in electrically noisy cabinets, and ICSP allows firmware updates in the field through the PGEC/PGED header. The 128 KB Flash holds protocol stacks plus application logic without external memory. A practical benefit versus higher-end PLC modules is cost: a single TQFP-80 DSC at roughly $6-8 (as of 2026-09-26) replaces discrete logic and analog control circuitry, cutting BOM count significantly in moderate-volume machines.
Recommended
Audio and Speech Processing
The GP (general purpose) dsPIC33F family is frequently used for speech and audio front ends: at 40 MIPS the core executes 16-bit fixed-point codecs, echo cancellation, and active noise-control filters in real time, with the barrel shifter and dual 40-bit accumulators keeping 32-bit intermediate results accurate. UART and SPI interfaces connect to audio codecs and Bluetooth modules, and output-compare channels can generate beeps or PWM-class-D drive signals. The 128 KB Flash stores phoneme tables and filter coefficient sets. Compared with a floating-point DSP, fixed-point development takes longer, but at under $10 per unit (as of 2026-09-26) and with a single-chip design, the dsPIC33FJ128GP708 is compelling for cost-sensitive intercom, PA, and hearing-assistance products.
Recommended
Automotive-Adjacent and Lighting Systems (Extended Temp Builds)
For under-hood-adjacent modules, HID/LED ballasts, and industrial lighting, the pin-compatible DSPIC33FJ128GP708AT-E/PT variant extends ambient rating to +125C while keeping the same footprint, allowing one PCB design to span standard and hot environments. The DSC generates PWM dimming with output-compare channels, measures current and temperature via the 1.1 Msps ADC, and communicates over UART or I2C to a body controller. Firmware-based control enables adaptive dimming curves, fault diagnosis, and graceful failure modes impossible with fixed-function ballast ICs. Thermal design is the main consideration: at 125C ambient the allowable self-heating is only 25C, so clock gating and reduced switching frequency should be budgeted in the power estimate.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ128GP708-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ128GP708AT-E/PT | DSPIC33FJ256GP708-I/PT | DSPIC33FJ64GP708-I/PT | DSPIC33FJ128GP310T-I/PT | DSPIC33FJ128GP706A-E/PT |
|---|---|---|---|---|---|---|
| Package | 80-pin TQFP (PT) | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | TQFP, 64-pin - fewer pins |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Speed | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS |
| Flash Memory | 128 KB | 128 KB | 256 KB | 64 KB | 256 KB | 128 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C |
| DMA Controller | No | No | No | No | Yes | Yes (A-revision) |
| Pin Count | 80 | 80 | 80 | 80 | 80 | 64 |
Key Differentiators
- Extended-temperature drop-in option (vs DSPIC33FJ128GP708AT-E/PT)
- Memory headroom on the same footprint (vs DSPIC33FJ256GP708-I/PT)
- DMA for high-throughput ADC streaming (vs DSPIC33FJ128GP310T-I/PT)
Design Notes
The dsPIC33FJ family requires an external low-ESR capacitor (typically 10 uF, per the family datasheet) on the VDDCORE/VCAP pin because the on-chip 2.5V core regulator is stabilized externally. Omitting this capacitor or using a high-ESR type causes brown-out resets or failure to start. Supply the VDD pins from a 3.0V-3.6V rail with 0.1 uF decoupling per pin pair placed within 2 mm. Estimated: at 40 MIPS the core current is roughly 40-60 mA (verify in datasheet electrical characteristics for your exact conditions).
Programming failures on this device almost always come from PGEC/PGED pairing. Per Microchip documentation, the dsPIC33FJ128GP708 has multiple ICSP pin pairs and you must use matched pairs: if PGEC2 carries ICSPCLK, ICSPDAT must be on PGED2. Route only one pair to the programming header, keep it under 10 cm, and do not load the pins with LEDs or pull-downs. Also ensure MCLR has a 10 kohm pull-up and, if VPP circuits are shared, isolate it from other 9V-tolerant circuitry.
For motor-control or digital-power layouts, keep the ADC's analog inputs away from PWM switching nodes and use the AN pin RC filter (about 1 kohm / 100 pF as a starting point) to reduce charge-injection error at the 1.1 Msps sampling rate. Assign ground returns so power-stage currents do not circulate under the TQFP; a solid ground plane with the DSC's VSS pins connected via multiple vias gives the best reference integrity. Use JTAG boundary-scan pins only as intended if you enable boundary scan in production test.
Compliance Information
Compliance status not stated in the provided web data; confirm on the official Microchip product page compliance documents. Part is in Active production per Jotrin and Microchip listings.
