DSPIC33FJ16GS402-50I/MM - 16-bit SMPS DSC, 50 MIPS, 28-QFN | Microchip
MPN: DSPIC33FJ16GS402-50I/MM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.89 | $4.89 |
| 10 | $4.32 | $43.20 |
| 100 | $3.78 | $378.00 |
| 500 | $3.41 | $1,705.00 |
| 1,000 | $3.05 | $3,050.00 |
DSPIC33FJ16GS402-50I/MM Overview
A Digital Signal Controller is a hybrid class of microcontroller that combines a deterministic 16-bit MCU core with a high-throughput DSP engine in a single die. In the broader taxonomy, the DSC sits between general-purpose microcontrollers (MCU) and standalone digital signal processors (DSP), giving designers single-cycle MAC operations alongside traditional peripheral control. The dsPIC33F GS family extends this architecture with hardware peripherals targeting power conversion: high-speed PWM, 10-bit ADC, analog comparators, and dedicated SMPS fault handling.
The DSPIC33FJ16GS402 features up to four high-speed PWM channels with 1.04 ns resolution at 50 MIPS, a 2 Msps 10-bit ADC, four analog comparators with programmable hysteresis, and a cycle-by-cycle current-limiting interface. It supports multiple switch-mode topologies including boost, buck, flyback, forward, SEPIC, Cuk, half-bridge, full-bridge, and PFC stages. Hardware-level fault inputs allow nanosecond-scale shutdown of the PWM outputs without CPU intervention, which is essential for safety-rated power stages.
The internal architecture uses a modified Harvard bus with two data fetches and one instruction fetch per cycle, a 16 x 16-bit working register array, and a DSP engine with dual 40-bit accumulators and a single-cycle MAC. The Flash program memory supports endurance of 1000 erase/write cycles minimum, and the device includes an integrated PLL that accepts external oscillator crystals or the internal Fast RC oscillator.
Typical applications include AC-to-DC converters, isolated DC-to-DC converters, power factor correction (PFC) front ends, uninterruptible power supplies (UPS), digital LED drivers, and battery chargers. The wide operating temperature and integrated analog make it suitable for industrial, telecom, and renewable-energy power architectures.
When designing with the DSPIC33FJ16GS402, route the exposed thermal pad (EP) directly to a ground copper pour of at least 1 square inch to dissipate heat from the PWM gate-drive transitions and ADC sampling. Decouple VDD/VSS pairs with 100 nF ceramic capacitors placed within 3 mm of every supply pin, and route the analog AVSS/AVDD pair with a separate ferrite bead from the digital supply to preserve ADC accuracy.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same Microchip dsPIC33F GS family, and practical PCB-layout guidance for the DSPIC33FJ16GS402-50I/MM that complement the manufacturer datasheet.
Drop-in alternatives for DSPIC33FJ16GS402-50I/MM — 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 DSPIC33FJ16GS402-50I/MM (same form factor and footprint) — differing in ADC, Analog Comparators, Core Architecture, Package, Maximum CPU Speed.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ16GS402T-50I/MM
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →DSPIC33FJ16GS402-I/MM
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →DSPIC33FJ16GS402-50E/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS502-50I/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS202-50I/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS402-50I/MM Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC33F DSC (modified Harvard) |
| CPU Speed | 50 MIPS at 50 MHz |
| Program Memory (Flash) | 16 KB (16K x 8) |
| RAM | 2 KB |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-pin QFN-S (MM), 6 x 6 mm with exposed pad |
| Mounting Type | Surface Mount |
| High-Speed PWM Outputs | Up to 4 channels, 1.04 ns resolution at 50 MIPS |
| ADC | 10-bit, up to 2 Msps |
| Analog Comparators | 4 with programmable hysteresis |
| PLL | Yes (x4, x8, x16 multiplier options) |
| Data EEPROM | None |
| I/O Pins | 21 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
DSPIC33FJ16GS402-50I/MM Pin Configuration
| Pin 1 | SDA/RPG15 — I2C data / remappable GPIO |
| Pin 2 | MCLR — Master Clear (reset input, active-low) |
| Pin 3 | PWM1L — PWM1 low-side output |
| Pin 4 | PWM1H — PWM1 high-side output |
| Pin 5 | PWM2L — PWM2 low-side output |
| Pin 6 | PWM2H — PWM2 high-side output |
| Pin 7 | PWM3L — PWM3 low-side output |
| Pin 8 | PWM3H — PWM3 high-side output |
| Pin 9 | VDD — Digital supply (3.0V to 3.6V) |
| Pin 10 | VSS — Digital ground |
| Pin 11 | OSC1/CLKI — Crystal oscillator input or external clock |
| Pin 12 | OSC2/CLKO — Crystal oscillator output |
| Pin 13 | PWM4L — PWM4 low-side output |
| Pin 14 | PWM4H — PWM4 high-side output |
| Pin 15 | FLTA1 — PWM fault input A |
| Pin 16 | FLTB1 — PWM fault input B |
| Pin 17 | PGEC1 — ICSP programming clock |
| Pin 18 | PGED1 — ICSP programming data |
| Pin 19 | AN0/C1IN+/RPA0 — Analog input 0 / comparator input / GPIO |
| Pin 20 | AN1/C1IN-/RPA1 — Analog input 1 / comparator input / GPIO |
| Pin 21 | AN2/C2IN+/RPA2 — Analog input 2 / comparator input / GPIO |
| Pin 22 | AN3/C2IN-/RPA3 — Analog input 3 / comparator input / GPIO |
| Pin 23 | AN4/RPB0 — Analog input 4 / GPIO |
| Pin 24 | AN5/RPB1 — Analog input 5 / GPIO |
| Pin 25 | AVSS — Analog ground |
| Pin 26 | AVDD — Analog supply (3.0V to 3.6V) |
| Pin 27 | SCL/RPG14 — I2C clock / remappable GPIO |
| Pin 28 | TDI/RPxx — JTAG TDI / remappable GPIO |
Typical Applications
DSPIC33FJ16GS402-50I/MM is suitable for 6 applications: Digital PFC Boost Converter, Isolated DC-to-DC Converter (Half/Full Bridge), Uninterruptible Power Supply (UPS) Inverter Control, Telecom and Server AC/DC Rectifier Module, Solar Microinverter and MPPT Controller, Industrial LED Driver with Analog Dimming.
Digital PFC Boost Converter
The DSPIC33FJ16GS402-50I/MM is the controller of choice for digital power-factor correction (PFC) boost converters. Its 50 MIPS core executes average-current-mode control loops within a 100 kHz PWM period with margin, while the four high-speed PWM channels at 1.04 ns edge resolution place the boost MOSFET drive edges exactly where analog compensation could not. The 2 Msps 10-bit ADC samples input voltage, inductor current, and output voltage within the same switching period, and the dedicated analog comparators provide cycle-by-cycle current limiting without loading the CPU. Reference designs in the Microchip dsPIC33F GS application notes achieve PF > 0.99 at 300 W using this part.
Recommended
Isolated DC-to-DC Converter (Half/Full Bridge)
For 200 W to 1 kW isolated DC-to-DC converters, the DSPIC33FJ16GS402-50I/MM drives the primary-side half-bridge or full-bridge MOSFETs with matched dead-time generation and adaptive duty cycle. Its 1.04 ns PWM resolution handles phase-shifted full-bridge (PSFB) control with sub-cycle timing accuracy, and the dual PWM pairs (PWM1H/L and PWM2H/L) provide hardware-level interlocking that prevents shoot-through. Auxiliary peripheral functions such as soft-start, primary-side voltage-mode feedback, and secondary-side synchronous rectification timing are all handled inside the same device, eliminating an external PWM controller IC.
Recommended
Uninterruptible Power Supply (UPS) Inverter Control
The DSPIC33FJ16GS402-50I/MM controls the inverter stage in line-interactive and on-line UPS systems running at 20-50 kHz PWM. Its DSP engine performs sine-PWM, space-vector modulation, and RMS regulation in a single part, and the analog comparators detect battery crossover and overload conditions with hardware response time below 100 ns. The 50 MIPS headroom allows simultaneous battery charging algorithm execution and inverter regulation, making the device well-suited to small-to-medium UPS products where a second MCU would otherwise be required.
Recommended
Telecom and Server AC/DC Rectifier Module
Inside 48 V telecom rectifier front ends and 12 V server PSU modules, the DSPIC33FJ16GS402-50I/MM implements the digital control loop for the bridgeless PFC + LLC resonant DC-DC topology. The high-speed PWM drives the LLC primary switches with adaptive dead-time, while the ADC samples resonant-tank current and output voltage for cycle-by-cycle soft-switching control. Industrial -40C to +85C operation ensures reliable performance in fan-cooled server chassis and outdoor telecom cabinets without derating.
Recommended
Solar Microinverter and MPPT Controller
The DSPIC33FJ16GS402-50I/MM serves as the MPPT and inverter controller in sub-500 W solar microinverters. It computes the perturb-and-observe MPPT every 100 ms while driving the high-frequency DC-link and unfolding-stage MOSFETs via its PWM channels. The Flash-based firmware is field-updatable through the on-chip ICSP, enabling future grid-code adaptation. Designers benefit from the device's low BOM integration (built-in comparators and ADC) that replaces discrete PWM controllers and op-amp interfaces.
Recommended
Industrial LED Driver with Analog Dimming
For high-brightness industrial LED drivers, the DSPIC33FJ16GS402-50I/MM regulates constant-current output through a buck or boost topology with 0-10 V analog dimming input. Its 10-bit ADC samples the LED string current with sub-1% accuracy, while the analog comparators provide fast over-current protection that bypasses CPU latency. The industrial temperature range and QFN exposed pad support fan-less driver enclosures. Wide PWM dimming ratios (>1000:1) are achievable thanks to the high-resolution PWM time base.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ16GS402-50I/MM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ16GS402T-50I/MM | DSPIC33FJ16GS402-I/MM | DSPIC33FJ16GS402-50E/MM | DSPIC33FJ16GS502-50I/MM | DSPIC33FJ16GS202-50I/MM |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN-S (MM) 6x6 mm | 28-QFN-S (MM) 6x6 mm - same | 28-QFN-S (MM) 6x6 mm - same | 28-QFN-S (MM) 6x6 mm - same | 28-QFN-S (MM) 6x6 mm - same | 28-QFN-S (MM) 6x6 mm - same |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash | 16 KB Flash | 32 KB Flash (+100%) | 16 KB Flash |
| CPU Speed | 50 MIPS at 50 MHz | 50 MIPS at 50 MHz | 50 MIPS at 50 MHz | 50 MIPS at 50 MHz | 50 MIPS at 50 MHz | 50 MIPS at 50 MHz |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| 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 | 3.0 V to 3.6 V |
| Family Variant | GS402 | GS402 T&R | GS402 alt speed grade | GS402 extended temp | GS502 (higher Flash) | GS202 (cost-reduced) |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- GS-family SMPS-optimized peripherals versus general-purpose DSCs (vs DSPIC33FJ16GP304-I/ML)
- Same-footprint 32 KB Flash upgrade path (vs DSPIC33FJ16GS502-50I/MM)
- Tighter 1.04 ns PWM resolution versus 6.4 ns in legacy SMPS controllers (vs Generic UC3842-style analog PWM controllers)
Design Notes
Estimated: at 50 MHz CPU clock with all four PWM pairs switching at 100 kHz, the device's digital I/O current draw sits in the 40-60 mA range from VDD. With theta_JA of ~28 C/W on a 1 square inch exposed-pad copper pour on FR4, the junction-to-ambient rise stays below 2 C at room temperature. For environments above 60 C or with sealed enclosures, increase the EP copper area to at least 1.5 square inches and consider thermal vias to inner ground planes to keep Tj below 125 C.
Place one 100 nF 0.1 uF X7R ceramic decoupling capacitor within 3 mm of every VDD/VSS pair and route AVDD/AVSS through a ferrite bead (such as BLM18AG601SN1) separated from the digital supply to preserve ADC accuracy. Keep the PWM traces short and length-matched (within 2 mm) between high-side and low-side pairs to minimize shoot-through risk. Route the analog ADC inputs away from PWM switching traces by at least 5 mm or shield them with a ground keepout.
Do not leave the FLTA1/FLTB1 fault pins floating; pull them to VDD with a 10 kohm resistor or wire them to a defined fault source, otherwise the PWM outputs may latch off unexpectedly on power-up. The OSC1/OSC2 pins require a properly loaded crystal (typically 8 MHz fundamental with 20 pF load caps) when using the PLL to reach 50 MIPS; a misloaded crystal causes CPU speed errors that look like watchdog resets. Always include a 1 kohm pull-up on MCLR to ensure clean reset behaviour at cold start.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 not applicable (DSC targeting SMPS, not automotive). Lead-free and halogen-free per Microchip environmental compliance data.
