DSPIC33FJ32GS406-50I/MR - 16-Bit DSC 50MIPS 32KB Flash | Microchip
MPN: DSPIC33FJ32GS406-50I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.12 | $6.12 |
| 10 | $5.55 | $55.50 |
| 25 | $5.29 | $132.25 |
| 100 | $4.87 | $487.00 |
| 1,000 | $4.44 | $4,440.00 |
DSPIC33FJ32GS406-50I/MR Overview
A digital signal controller combines the computational throughput of a DSP with the deterministic peripheral set and interrupt architecture of a microcontroller. Within the power-management IC hierarchy, the dsPIC33F GS family replaces analog control loops with firmware-based closed-loop control, enabling programmable compensation, soft-start, and fault handling in switched-mode power supplies.
Key differentiating features include the SMPS-optimized high-speed PWM module with nanosecond-resolution duty-cycle updates, dedicated ADC sampling triggered directly by the PWM for loop synchronization, on-chip analog comparators for cycle-by-cycle current limiting, and a DSP engine with single-cycle MAC and dual operand fetch. The controller also provides QEI (quadrature encoder interface) support, multiple UART/SPI/I2C serial ports, and 5 timers per distributor listings.
The modified Harvard 16-bit core executes most instructions in a single cycle, with hardware loop constructs and zero-overhead DO/REPEAT instructions that reduce ISR overhead in high-frequency control loops. Operating speed is set by an internal PLL from an external crystal, supporting the 50 MIPS (approximately 40 MHz class instruction timing noted in some distributor data; 50 MIPS is the headline rating across Mouser, DigiKey and Microchip materials).
Typical applications include AC-DC power supplies, interleaved power factor correction (Microchip provides a dedicated interleaved PFC reference design for this family), DC-DC converters, digital lighting ballasts, battery chargers, and embedded motor control where QEI feedback is used.
Design consideration: budget the 3.0V to 3.6V supply strictly and place the VDD/VSS decoupling network and AVDD filter close to the die; the high-speed PWM layout demands short gate-drive traces to minimize ringing.
This page synthesizes distributor pricing, drop-in alternatives, pinout resources, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for DSPIC33FJ32GS406-50I/MR — 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 DSPIC33FJ32GS406-50I/MR (same form factor and footprint) — differing in Special Peripherals, Package, Packaging, Core, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ64GS406-50I/MR
✅ Drop-In✓ In Stock
$4.45 / Unit
View Datasheet →DSPIC33FJ32GS406T-50I/MR
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →DSPIC33FJ64GS406T-50I/MR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.38 / Unit
View Datasheet →DSPIC33FJ32GS406-50I/MR Maximum Ratings & Electrical Characteristics
| Core | dsPIC33F 16-bit DSC |
| Instruction Rate | 50 MIPS |
| Flash Program Memory | 32 KB (32K x 8) |
| RAM | 4 KB |
| Package | 64-VQFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (I grade) |
| Timers/Counters | 5 |
| Programmable I/O | 58 |
| Communication Interfaces | I2C, SPI, UART |
| Special Peripherals | SMPS high-speed PWM, QEI, high-speed ADC, comparators |
| Packaging | Tube (factory pack quantity 40) |
| RoHS Status | RoHS Details (per digichip listing) |
| Lifecycle Status | In Production (Microchip product page) |
DSPIC33FJ32GS406-50I/MR 64-vqfn (9x9 mm) Pin Configuration Guide
Pin configuration for DSPIC33FJ32GS406-50I/MR (64-vqfn (9x9 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 DSPIC33FJ32GS406-50I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33FJ32GS406-50I/MR is suitable for 6 applications: Interleaved Power Factor Correction, AC-DC Switch-Mode Power Supplies, DC-DC Converters and Point-of-Load Regulation, Digital Lighting Ballasts and LED Drivers, Battery Chargers and Power Conversion in Embedded Systems, Digital Motor Control with Encoder Feedback.
Interleaved Power Factor Correction
The DSPIC33FJ32GS406-50I/MR fits interleaved PFC directly: Microchip publishes a dedicated interleaved PFC reference design for the dsPIC33F GS family, and the on-chip high-speed PWM can drive two interleaved phases with precise phase offset while the high-speed ADC samples input current and bus voltage synchronized to each PWM cycle at 50 MIPS loop rates. In a typical 400W front-end, the controller closes the current loop in firmware, implements average-current-mode compensation digitally, and uses the analog comparators for cycle-by-cycle overcurrent limiting without external protection ICs. The 32 KB Flash holds control law, fault handling, and communication telemetry. Unlike analog PFC controllers, firmware control enables adaptive compensation across universal AC input (90-264 VAC) and soft recovery during load transients, at the cost of requiring careful ADC-PWM latency management.
Recommended
AC-DC Switch-Mode Power Supplies
In AC-DC SMPS designs (server front ends, telecom rectifiers, industrial adapters), the DSPIC33FJ32GS406-50I/MR replaces analog PWM controllers with a fully digital control loop. The SMPS high-speed PWM offers duty-cycle updates synchronized to the ADC, allowing a voltage-mode or current-mode loop running at switching frequencies of hundreds of kHz with deterministic sampling. On-chip comparators plus the PWM fault inputs implement nanosecond-class hiccup or cycle-by-cycle current limiting, while the 16-bit DSP core handles startup sequencing, burst mode, and constant-power profiles in firmware. The 58 available I/O support multiple output rail sequencing and PMBus-style telemetry over UART/I2C. Key benefit: one programmable silicon platform covers multiple power ratings, cutting qualification time; the trade-off is firmware validation effort versus a fixed-function analog controller.
Recommended
DC-DC Converters and Point-of-Load Regulation
For digital DC-DC bricks, bidirectional converters, and high-current point-of-load stages, the 50 MIPS dsPIC33F core executes PID or type-III compensators with single-cycle MAC operations, sustaining control bandwidths that challenge mid-range analog controllers. The high-speed PWM's fine duty resolution minimizes output ripple artifacts, and the high-speed ADC triggers directly from PWM events so sampling jitter stays in the nanosecond range - critical for stable loop gain at high switching frequency. The QEI and comparator peripherals additionally suit digitally controlled buck converters with encoder-positioned transformers or resonant topologies. Because compensation coefficients live in firmware, one hardware design adapts across input voltages and output sets via I2C commands. Designers should budget loop latency (ADC conversion plus ISR plus PWM update) when targeting switching frequencies above roughly 500 kHz.
Recommended
Digital Lighting Ballasts and LED Drivers
High-intensity discharge ballasts and high-power LED drivers benefit from the DSPIC33FJ32GS406-50I/MR's combination of resonant-capable PWM outputs, synchronized ADC current sampling, and firmware-defined dimming curves. The high-speed PWM supports complementary outputs with programmable dead time for half-bridge and full-bridge resonant stages, while the comparators provide fast lamp/LED string overcurrent protection. At 50 MIPS, the controller executes frequency modulation (for LLC-based LED drivers) plus power-factor correction in a single chip, and the 32 KB Flash leaves room for DALI/DMX-style communication stacks over UART. Compared with a discrete analog ballast controller, digital control enables lamp-end-of-life detection, thermal foldback, and programmable ignition sequencing - features that improve reliability and differentiate end products, at the expense of firmware safety certification effort.
Recommended
Battery Chargers and Power Conversion in Embedded Systems
Multi-chemistry battery chargers use the DSPIC33FJ32GS406-50I/MR to run the charge power stage and the charge management state machine on one die. The high-speed PWM drives a buck or flywheel converter while the synchronized ADC tracks pack current and voltage with PWM-aligned sampling, supporting CC/CV profiles, termination detection, and coulomb-style accounting in firmware. On-chip comparators flag fault conditions within one switching cycle, and the 58 I/O handle cell-selection multiplexers, fan control, and status indication. A QEI input accommodates encoder-based user interfaces on professional chargers. Since charging curves are firmware constants, one board supports lead-acid, Li-ion and NiMH packs via I2C configuration - a major advantage for service fleets. Thermal management of the converter, not the DSC, typically dominates the design at multi-amp charge rates.
Recommended
Digital Motor Control with Encoder Feedback
The QEI (quadrature encoder interface) peripheral makes the DSPIC33FJ32GS406-50I/MR well suited to servo-style motor control where position feedback drives field-oriented or trapezoidal commutation. At 50 MIPS with single-cycle DSP MAC, the DSC executes current-loop PI regulators and speed observers while the high-speed PWM generates three-phase complementary drive signals with dead-time control. The synchronized ADC samples phase currents at PWM centers to eliminate switching noise from measurements, and comparators provide hardware overcurrent trips independent of firmware latency. Typical uses include industrial servo drives, pumps, and digitally controlled blowers where the power-conversion peripherals of the GS family pair with encoder feedback normally found on motor-control dsPIC variants. The unified platform lets one firmware base serve both power-supply and motion duties in products such as solar pump inverters.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ32GS406-50I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ64GS406-50I/MR | DSPIC33FJ32GS406T-50I/MR | DSPIC33FJ64GS406T-50I/MR |
|---|---|---|---|---|
| Package | 64-VQFN (9x9 mm) | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same | 64-VQFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 64 KB | 32 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB |
| Performance | 50 MIPS, 16-bit dsPIC33F | 50 MIPS, 16-bit dsPIC33F | 50 MIPS, 16-bit dsPIC33F | 50 MIPS, 16-bit dsPIC33F |
| SMPS PWM / ADC / Comparators | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| Packaging / Delivery | Tube (factory pack 40) | Tube | Tape & Reel | Tape & Reel |
| Lifecycle Status | In Production | In Production | In Production | In Production |
Key Differentiators
- SMPS-optimized peripheral set (vs DSPIC33FJ32GP304-I/ML)
- Pin-to-pin memory upgrade path (vs DSPIC33FJ64GS406-50I/MR)
- Balanced memory configuration (vs DSPIC33FJ16GS504-50I/PT)
Design Notes
For the 64-VQFN (9x9 mm) MR package, connect the exposed thermal pad to a solid ground plane with a minimum 5x5 via array; this is the primary return-current path and the only meaningful heat spreader for a 9x9 QFN. Place 100 nF ceramic decoupling on each VDD/AVDD pin pair within 3 mm of the pad, and keep the AVDD RC filter (ferrite plus 10 uF) isolated from digital VDD to preserve ADC accuracy in SMPS current-sense loops. Per Microchip's GS-family layout guidance, route PWM gate-drive traces short and over uninterrupted ground.
Do not confuse the /MR (64-VQFN) and /PT (TQFP-64) footprints - they share silicon but not land patterns, so procurement substitutions silently break assembly. Also confirm the voltage suffix: this -50I part is industrial grade (-40C to +85C); designs near hot power electronics should derate or verify an E-grade option exists. Finally, when substituting the DSPIC33FJ64GS406, update only the linker script/device header - the pinout and peripherals are identical per the shared datasheet 70000591f.
Estimated: with a typical 3.3 V supply and roughly 50-80 mA operating current for a GS-family DSC running full-speed control loops (per comparable dsPIC33F figures; verify against the datasheet electrical specifications table), power dissipation is about 165-265 mW. With the 9x9 QFN thermal pad well soldered to a ground plane this presents no thermal concern, but confirm the exact ICC figure from the manufacturer datasheet electrical characteristics rather than relying on this estimate for safety analysis.
Trigger the high-speed ADC from the PWM module rather than from a software timer: PWM-synchronized sampling places the sample instant away from switching edges, dramatically reducing switching-noise aliasing in current-sense channels. Keep sense lines to ANx inputs as short differential pairs where possible and use the comparators - not firmware polling - for overcurrent trips so protection latency is independent of ISR load at 50 MIPS.
Compliance Information
RoHS compliance indicated in distributor listings (digichip: 'RoHS: Details'). REACH, lead-free, halogen-free and conflict-minerals statuses not explicitly stated in the verified data - consult Microchip's material declaration for this MPN.
