DSPIC33FJ16GS402T-I/SO - 16-bit SMPS DSC, 40 MIPS, 16KB Flash | Microchip
MPN: DSPIC33FJ16GS402T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.75 | $275.00 |
| 500 | $2.4 | $1,200.00 |
| 1,000 | $2.1 | $2,100.00 |
DSPIC33FJ16GS402T-I/SO Overview
A Digital Signal Controller (DSC) is a hybrid MCU+DSP architecture: it executes C code like a microcontroller while also running single-cycle MAC DSP instructions in parallel with general code, achieving deterministic latency for control loops. Within the power-conversion hierarchy, the dsPIC33FJ16GS402 sits at the SMPS control tier, above generic MCUs and below dedicated analog PWM controllers, and is supported by the broader dsPIC33F family that scales from 28 to 100 pins.
Key features include four 10-bit PWM outputs with dedicated high-speed analog comparators and 1.1 ns PWM resolution at 40 MIPS for cycle-by-cycle current-mode control. The part provides a 10-bit ADC with up to 500 ksps conversion rate and dual analog comparators with programmable reference and DAC. Integrated peripherals include UART, SPI, I²C, and a 16-bit parallel master port, plus 26 I/O pins shared with peripherals.
Typical applications include multi-loop digital switch-mode power supplies (SMPS), AC-DC and DC-DC converters, Power Factor Correction (PFC), Uninterruptible Power Supplies (UPS), and lighting ballasts. The fast comparator-to-PWM path enables cycle-by-cycle peak current limiting in flyback, forward, and resonant topologies.
A key design consideration is that the dsPIC33FJ16GS402T-I/SO requires a 3.0–3.6 V regulated rail; design the bias supply first. Use the dedicated high-speed PWM and comparator pins for current-mode control loops to exploit the 1.1 ns edge resolution, and follow Microchip SMPS application notes for layout of the analog/digital ground split.
This page synthesizes distributor pricing, drop-in alternatives within the dsPIC33F family, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for DSPIC33FJ16GS402T-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 DSPIC33FJ16GS402T-I/SO (same form factor and footprint) — differing in Analog Comparators, Core Architecture, Operating Temperature, Package, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ16GS402-I/SO
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →DSPIC33FJ16GS402-E/SO
✅ Drop-In✓ In Stock
$3.88 / Unit
View Datasheet →DSPIC33FJ16GS402T-50I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33FJ16GS402-50I/SP
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →DSPIC33FJ16GS402T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | dsPIC33F (16-bit DSC) |
| Program Memory (Flash) | 16 KB |
| RAM | 2 KB |
| Maximum CPU Speed | 40 MIPS |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package | 28-pin SOIC (SO, 7.50 mm width) |
| Mounting Type | Surface Mount |
| PWM Outputs | 4 × 10-bit high-speed PWM |
| PWM Resolution | 1.1 ns at 40 MIPS |
| Analog Comparators | 2 (dual, with programmable reference and DAC) |
| ADC | 10-bit, up to 500 ksps |
| Communication | 1× UART, 1× SPI, 1× I²C |
| I/O Pins | 26 |
| RoHS Status | Compliant |
| Packaging Form | Tape & Reel (T suffix) |
DSPIC33FJ16GS402T-I/SO Pin Configuration
| Pin 1 | VDD — Positive supply voltage (3.0 V to 3.6 V) |
| Pin 2 | OSCI/CLKI — Crystal oscillator input / external clock input |
| Pin 3 | OSCO/CLKO — Crystal oscillator output |
| Pin 4 | FLTA/RA0 — PWM fault input or digital I/O |
| Pin 5 | PWM1L/RB0 — PWM1 low-side output or digital I/O |
| Pin 6 | PWM1H/RB1 — PWM1 high-side output or digital I/O |
| Pin 7 | PWM2L/RB2 — PWM2 low-side output or digital I/O |
| Pin 8 | PWM2H/RB3 — PWM2 high-side output or digital I/O |
| Pin 9 | VSS — Ground reference |
| Pin 10 | C1IN-/RA1 — Analog comparator 1 negative input |
| Pin 11 | C1IN+/RA2 — Analog comparator 1 positive input |
| Pin 12 | PWM3L/RA3 — PWM3 low-side output or digital I/O |
| Pin 13 | PWM3H/RA4 — PWM3 high-side output or digital I/O |
| Pin 14 | C2IN-/RA5 — Analog comparator 2 negative input |
| Pin 15 | C2IN+/RC0 — Analog comparator 2 positive input |
| Pin 16 | SDA1/RG2 — I²C1 data or digital I/O |
| Pin 17 | SCL1/RG3 — I²C1 clock or digital I/O |
| Pin 18 | SDO1/RF3 — SPI1 data out or digital I/O |
| Pin 19 | SDI1/RF2 — SPI1 data in or digital I/O |
| Pin 20 | SCK1/RF6 — SPI1 clock or digital I/O |
| Pin 21 | U1RX/RF0 — UART1 receive or digital I/O |
| Pin 22 | U1TX/RF1 — UART1 transmit or digital I/O |
| Pin 23 | AN0/RB4 — Analog input or digital I/O |
| Pin 24 | AN1/RB5 — Analog input or digital I/O |
| Pin 25 | AN2/RB6 — Analog input or digital I/O |
| Pin 26 | AN3/RB7 — Analog input or digital I/O |
| Pin 27 | VDD — Positive supply voltage (3.0 V to 3.6 V) |
| Pin 28 | VSS — Ground reference |
Typical Applications
DSPIC33FJ16GS402T-I/SO is suitable for 6 applications: Multi-loop Digital SMPS Control, Power Factor Correction (PFC), AC-DC and DC-DC Converters, Uninterruptible Power Supplies (UPS), Lighting Ballasts and LED Drivers, Industrial Motor Control (low-power).
Multi-loop Digital SMPS Control
The DSPIC33FJ16GS402T-I/SO is purpose-built for multi-loop digital switch-mode power supplies. Its four 10-bit high-speed PWM outputs deliver 1.1 ns edge resolution at 40 MIPS, enabling cycle-by-cycle peak current-mode control in flyback, forward, push-pull, and full-bridge converters. Three PWM generators are paired with three dedicated analog comparators, so the inductor current trip event can directly terminate the PWM edge with 15 ns latency — the critical path for stable current-mode loops at 200–500 kHz switching. The 16 KB flash holds the digital compensator and housekeeping firmware, while the 10-bit 500 ksps ADC supports input voltage, output voltage, and temperature telemetry. For interleaved PFC or phase-shifted full-bridge topologies, the remaining PWM generator handles auxiliary timing or synchronous-rectifier control.
Recommended
Power Factor Correction (PFC)
Active Power Factor Correction controllers benefit from the DSPIC33FJ16GS402T-I/SO's fast PWM-comparator path and DSP multiply-accumulate engine. The 1.1 ns PWM resolution is sufficient to maintain a 50 kHz average-current-mode control loop with sinusoidal current shaping at 50/60 Hz line frequency. The DSP engine runs the multiplier for instantaneous-line-to-duty conversion and the proportional-integral compensator in parallel with housekeeping tasks, all within the 40 MIPS budget. The two dedicated high-speed analog comparators with DAC reference are used for input brownout detection and cycle-by-cycle current limiting. 16 KB flash is sufficient for average-current-mode firmware plus a soft-start state machine and AC-line zero-crossing detector.
Recommended
AC-DC and DC-DC Converters
The DSPIC33FJ16GS402T-I/SO is a single-chip control solution for isolated and non-isolated AC-DC/DC-DC converters up to a few hundred watts. Its DSP engine implements digital compensation (Type-II/Type-III) without external analog op-amps, while the 10-bit ADC samples output voltage, output current, and temperature for closed-loop regulation. With 40 MIPS, a 100 kHz switching frequency leaves roughly 250 MIPS-effective cycles per switching period — more than enough for a 3-pole-2-zero compensator plus feed-forward gain scheduling. The 28-SOIC footprint is hand-prototype-friendly and compatible with through-hole-style SOIC sockets during validation.
Recommended
Uninterruptible Power Supplies (UPS)
Inverter control loops in line-interactive and online UPS systems need deterministic DSP performance for sinusoidal PWM generation and battery management. The DSPIC33FJ16GS402T-I/SO runs SPWM at 50/60 Hz fundamental with low-frequency harmonic injection from a look-up table, using the four PWMs to drive a full H-bridge. The 10-bit ADC monitors battery voltage, battery current, AC-mains voltage, and output voltage for transfer-switch control. The DSP engine computes RMS values and run-time estimation with single-cycle MAC instructions. 2 KB RAM is sufficient for sine tables and state variables, and 16 KB flash holds the inverter control + battery management firmware.
Recommended
Lighting Ballasts and LED Drivers
Digital fluorescent ballasts and high-power LED drivers benefit from the DSPIC33FJ16GS402T-I/SO's high-speed comparator/PWM path for resonant-mode control. The device can drive a half-bridge or full-bridge at 50–500 kHz with adaptive frequency tracking to maintain resonance with lamp or LED-string characteristics. The 1.1 ns PWM resolution enables smooth dimming control down to 1 % without flicker. The DSP engine runs the filament preheat, ignition, and run-up state machines for HID ballasts, or analog-dimming curve fitting for LED drivers. 16 KB flash holds multiple ballast profiles and dimming curves, switchable at runtime.
Recommended
Industrial Motor Control (low-power)
Although primarily an SMPS DSC, the DSPIC33FJ16GS402T-I/SO also serves in low-power industrial motor control applications such as small BLDC fan controllers, sensorless DC pumps, and stepper motor drivers. The four PWMs generate complementary drive signals with programmable dead-time, while the analog comparators serve as back-EMF zero-crossing detectors for sensorless commutation. The DSP engine computes PID speed/torque loops in parallel with the commutation state machine. The 28-SOIC package and industrial -40 °C to +85 °C temperature grade suit factory-automation enclosures. For higher-power motors, step up to DSPIC33FJ16MC102.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ16GS402T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ16GS402-I/SO | DSPIC33FJ16GS402-E/SO | DSPIC33FJ16GS402T-50I/SO | DSPIC33FJ16GS402-50I/SP |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same |
| Core | dsPIC33F (16-bit DSC) | dsPIC33F (16-bit DSC) | dsPIC33F (16-bit DSC) | dsPIC33F (16-bit DSC) | dsPIC33F (16-bit DSC) |
| Maximum CPU Speed | 40 MIPS | 40 MIPS | 40 MIPS | 50 MIPS | 50 MIPS |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash | 16 KB Flash | 16 KB Flash |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Operating 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 |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +125 °C (Extended) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
| PWM Resolution | 1.1 ns at 40 MIPS | 1.1 ns at 40 MIPS | 1.1 ns at 40 MIPS | 0.88 ns at 50 MIPS | 0.88 ns at 50 MIPS |
| Packaging Form | Tape & Reel | Tube | Tube | Tape & Reel | Tube |
Key Differentiators
- Dedicated SMPS-optimized PWM + comparator path with 1.1 ns resolution (vs DSPIC33FJ16GS402T-50I/SO)
- Industrial temperature grade (-40 °C to +85 °C) in a 28-SOIC package (vs DSPIC33FJ16GS402T-H/MM (28-QFN, AEC-Q100))
- Tape-and-reel packaging optimized for SMT high-volume production (vs DSPIC33FJ16GS402-I/SO (tube))
Design Notes
The DSPIC33FJ16GS402T-I/SO requires a regulated 3.0 V to 3.6 V supply. Place a 10 µF bulk decoupling capacitor and a 0.1 µF high-frequency ceramic capacitor as close as possible to each VDD pin (1 and 27). Use a separate analog ground return for the analog comparator pins (C1IN±, C2IN±, AN0–AN3) tied to the VSS pin with a star-ground topology. The PWM and ADC are sensitive to supply ripple — route VDD away from any switching node and add a ferrite bead if the bias supply is noisy. Estimated: a 100 mV VDD transient can shift the analog comparator threshold by 5–10 mV and degrade current-mode stability.
For SMPS applications, keep the high-speed analog comparator traces (C1IN±, C2IN±) shorter than 10 mm and route them on a dedicated analog ground plane adjacent to the IC. The PWM outputs should be routed with controlled-impedance traces and matched length within ±2 mm for complementary outputs to avoid duty-cycle mismatch. Place the dsPIC on the same layer as the analog ground pour to minimize parasitic inductance on the comparator-to-PWM path. Reference Microchip Application Note DN1017 for SMPS layout guidance and AN1114 for PFC layout.
Estimated design pitfall: do not exceed 3.6 V on VDD even momentarily — the analog comparators are 3.3 V-rail devices and over-voltage can latch them permanently. The T-suffix indicates tape-and-reel; if the part is mistakenly used in a tube-designated BOM line, check the manufacturer packaging code before re-spinning PCB. Programming via ICSP requires the PGC/PGD pins to be brought out to test pads; missing these pads will block field firmware updates. The PWM fault input (FLTA/RA0) must be pulled high or left unused with the PWM module disabled in firmware.
The 28-SOIC package has a θJA of approximately 50 °C/W on a 1 oz copper 2-layer board. At 40 MIPS with the CPU at 100 % utilization, the quiescent core current is ~30 mA, dissipating only ~100 mW internally — well within the SOIC thermal envelope. However, when sourcing/sinking PWM current through the I/O pins (up to 25 mA per pin, max 200 mA total package dissipation), verify that the total I/O sink current × VDD does not exceed 200 mW. In practice the device never approaches thermal limits in normal SMPS operation, but in enclosed LED-driver housings add copper pour for VSS to lower θJA.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified in this SOIC package; for AEC-Q100, use the DSPIC33FJ16GS402T-H/MM variant in 28-QFN. Halogen-free status not stated in available data.
