DSPIC33FJ16GS502-50I/SO - 16-bit SMPS DSC, 50 MIPS, 28-SOIC | Microchip
MPN: DSPIC33FJ16GS502-50I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.86 | $4.86 |
| 10 | $4.38 | $43.80 |
| 100 | $3.49 | $349.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.65 | $2,650.00 |
DSPIC33FJ16GS502-50I/SO Overview
A Digital Signal Controller is a class of embedded processor that fuses a microcontroller's deterministic interrupt-driven control architecture with a digital signal processor's MAC engine and single-cycle hardware loop buffer. In the broader embedded hierarchy, the DSC sits between a general-purpose MCU and a standalone DSP, making it well suited to applications that simultaneously require sensor sampling, fast arithmetic on filtered variables, and tight feedback control. The dsPIC33F family, of which the DSPIC33FJ16GS502 is a member, was specifically engineered for digital power conversion, with peripheral sets that include high-speed PWM, high-speed ADC, and analog comparators tightly coupled to the CPU for sub-microsecond control-loop latency.
Key features of the DSPIC33FJ16GS502-50I/SO include up to four high-speed PWM channels with 1.04 ns resolution, two 10-bit DAC outputs for slope compensation or reference generation, four high-speed analog comparators for cycle-by-cycle current limiting, and a 10-bit ADC with a 4 Msps conversion rate. The 28-pin SOIC package exposes the full SMPS-oriented peripheral set while fitting into designs where board height is constrained and through-hole or quad-pack alternatives are not desired. Industrial temperature range of -40C to +85C is supported by the -50I suffix.
Typical applications include digitally controlled AC/DC power supplies, isolated DC/DC converters using peak-current-mode or average-current-mode control, bridgeless PFC stages, solar micro-inverters, digital welding power sources, and uninterruptible power systems. The high-speed analog comparator block enables cycle-by-cycle over-current protection that trips within a single PWM period, a feature that is essential when controlling SiC, GaN, or high-current silicon MOSFET switching stages where protection latency directly affects system reliability. Companion products in a typical design include a Microchip MCP16311 or MCP19114 analog front-end, gate-driver ICs such as the MCP14 family, and current-sense amplifiers built from low-offset op-amps such as the MCP6C04.
When designing with the DSPIC33FJ16GS502-50I/SO, ensure that the AVSS pin is tied to a clean analog ground return that does not share a path with high-di/dt switching currents, since the integrated ADC and comparators rely on a low-noise reference for accurate current sensing. The internal LDO regulator that supplies the core from VDD must be bypassed with a 10 microfarad ceramic capacitor placed within 5 mm of the VCAP pin; without this capacitor the part will not start up reliably. Programming is supported through the device's ICSP interface and the JTAG boundary-scan port, both accessible via Microchip's MPLAB X IDE and the MPLAB ICD 3 or PICkit 4 in-circuit debugger.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, providing a single reference for engineers evaluating the DSPIC33FJ16GS502-50I/SO for digital power designs.
Drop-in alternatives for DSPIC33FJ16GS502-50I/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 DSPIC33FJ16GS502-50I/SO (same form factor and footprint) — differing in ADC, Package, Analog Comparators, Core Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ16GS502-50I/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS502T-50I/SO
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →DSPIC33FJ06GS502-50I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS402-50I/SP
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.85 / Unit
View Datasheet →DSPIC33FJ16GS502-50I/MX
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33FJ16GS502-H/SP
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →DSPIC33FJ16GS502-50I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | dsPIC33F (16-bit DSC with DSP engine) |
| CPU Speed | 50 MIPS at 50 MHz CPU clock |
| Program Memory (Flash) | 16 KB |
| Data RAM | 2 KB |
| Operating Voltage Range | 3.0 V to 3.6 V |
| High-Speed PWM Channels | 4 outputs with 1.04 ns resolution |
| High-Speed Analog Comparators | 4 |
| 10-bit DAC Outputs | 2 |
| ADC | 10-bit, up to 4 Msps |
| Timers | 3 (16-bit) |
| External Interrupts | 3 |
| Package | 28-pin SOIC (wide body, 300 mil) |
| Operating Temperature Range | -40 C to +85 C (industrial, -I suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Programming/Debug Interface | ICSP and JTAG (IEEE 1149.2) |
DSPIC33FJ16GS502-50I/SO Pin Configuration
| Pin 1 | MCLR — Master Clear (active-low device reset) |
| Pin 2 | RA0 — GPIO / analog input AN0 |
| Pin 3 | RA1 — GPIO / analog input AN1 |
| Pin 4 | RA2 — GPIO / analog input AN2 |
| Pin 5 | RB0 — GPIO / PWM2H |
| Pin 6 | RB9 — GPIO |
| Pin 7 | RB10 — GPIO |
| Pin 8 | VSS1 — Digital ground |
| Pin 9 | RB1 — GPIO / PWM2L |
| Pin 10 | RB2 — GPIO |
| Pin 11 | RB3 — GPIO |
| Pin 12 | RB4 — GPIO |
| Pin 13 | VDD1 — Digital supply (3.0-3.6 V) |
| Pin 14 | RB8 — GPIO |
| Pin 15 | RB15 — GPIO |
| Pin 16 | PWM1H — PWM1 high-side output |
| Pin 17 | PWM1L — PWM1 low-side output |
| Pin 18 | C1IN- — Analog comparator 1 inverting input |
| Pin 19 | C1IN+ — Analog comparator 1 non-inverting input |
| Pin 20 | VCAP — Internal LDO output (bypass 10 uF) |
| Pin 21 | AVSS — Analog ground (clean return) |
| Pin 22 | AVDD — Analog supply (3.0-3.6 V) |
| Pin 23 | C2IN- — Analog comparator 2 inverting input |
| Pin 24 | C2IN+ — Analog comparator 2 non-inverting input |
| Pin 25 | DAC1 — 10-bit DAC 1 output |
| Pin 26 | DAC2 — 10-bit DAC 2 output |
| Pin 27 | C3IN+/C4IN+ — Analog comparators 3 and 4 non-inverting input |
| Pin 28 | PWM2H/PWM2L — PWM2 outputs (multiplexed) |
Typical Applications
DSPIC33FJ16GS502-50I/SO is suitable for 7 applications: Digitally Controlled AC/DC Power Supply, Isolated DC/DC Converter with Digital Current-Mode Control, Power Factor Correction (PFC) Stage, Uninterruptible Power Supply (UPS) Control, Solar Micro-Inverter / Power Optimizer, Digital Welding Power Source, Class-D Audio Amplifier Power Stage Controller.
Digitally Controlled AC/DC Power Supply
The DSPIC33FJ16GS502-50I/SO is purpose-built for digital control of AC/DC converters operating from universal mains (90 V to 264 V AC) where a downstream isolated stage produces 5 V to 48 V DC rails. The four high-speed PWM outputs at 1.04 ns resolution drive the primary-side MOSFET or GaN switch, while the four integrated high-speed analog comparators perform cycle-by-cycle peak-current limiting, which is essential when protecting against transformer saturation during start-up and overload transients. The 10-bit DAC outputs generate programmable slope-compensation ramps that adapt automatically to duty-cycle changes in CCM/DCM transitions, eliminating the analog RC mismatch of discrete slope-compensation circuits. The 16 KB Flash comfortably stores a multi-loop PID compensator plus input-voltage feed-forward, brown-out recovery, and PMBus-compatible telemetry. Total BOM reduction compared to a UCC28C42 analog controller plus companion MCU is typically two to three ICs and a substantial analog compensation network.
Recommended
Isolated DC/DC Converter with Digital Current-Mode Control
In an isolated point-of-load or intermediate-bus DC/DC converter, the DSPIC33FJ16GS502-50I/SO executes average-current-mode or peak-current-mode control loops with sub-microsecond latency. The 10-bit ADC at 4 Msps samples primary-side current and voltage simultaneously, while the integrated comparators provide hardware-overcurrent protection that can shut down the PWM within a single switching period. Its 50 MIPS core runs the digital compensator plus adaptive dead-time insertion, eliminating transformer-saturation risk and improving efficiency by 1-3 percent compared to fixed-dead-time analog designs. The 2 KB SRAM holds the state-machine buffers and IIR filter tap lines needed for accurate ripple injection without aliasing. Industrial-grade 28-SOIC packaging suits dense through-hole-replacement layouts where the design must pass 2.5 kV isolation while staying below 25 mm in component height.
Recommended
Power Factor Correction (PFC) Stage
The DSPIC33FJ16GS502-50I/SO is a strong fit for CCM or DCM boost-PFC front-end stages targeting compliance with EN61000-3-2 and similar harmonic standards. Its four PWM channels drive the boost switch plus auxiliary synchronous-rectification logic, while the dedicated high-speed comparators detect inductor zero-current and zero-crossing events required for valley-switching DCM techniques that improve light-load efficiency. The two 10-bit DACs generate programmable reference and slope-compensation waveforms, replacing what would otherwise be two external DAC ICs. With 50 MIPS, the controller can execute sinusoidal-current-shaping math plus input-voltage feed-forward plus adaptive switching-frequency control without leaving headroom for DSP bottlenecks. The -40 C to +85 C industrial temperature range supports outdoor LED-driver and industrial-PFC applications where ambient temperatures regularly exceed 70 C.
Recommended
Uninterruptible Power Supply (UPS) Control
In line-interactive and online UPS designs, the DSPIC33FJ16GS502-50I/SO coordinates battery-mode transfer, inverter control, and battery-charging regulation from a single IC. The high-speed analog comparators sense inverter output current for instantaneous over-current and short-circuit protection, while the four PWM outputs drive a full-bridge inverter stage at switching frequencies up to 500 kHz with adaptive dead-time insertion handled in firmware. The 16 KB Flash stores state-machine logic for grid/battery transfer plus sine-wave lookup tables plus closed-loop voltage regulation, and the 10-bit ADC samples both DC-bus voltage and AC output voltage with sub-millisecond update rate. The 28-SOIC footprint fits into a compact power-module form factor where board area is at a premium and designers prefer one IC over separate MCU plus DSP partitions.
Recommended
Solar Micro-Inverter / Power Optimizer
The DSPIC33FJ16GS502-50I/SO fits small-scale photovoltaic micro-inverter and module-level power-optimizer designs where the goal is to harvest maximum energy from individual PV modules while providing arc-fault detection and rapid-shutdown per UL1741 and NEC 2017. Its high-speed comparators support arc-fault detection by detecting high-frequency noise on the DC string, while the four PWM outputs drive a high-frequency isolated DC/DC stage feeding a grid-tie inverter. The 50 MIPS CPU performs per-module MPPT (Maximum Power Point Tracking) at sub-second intervals, and the 10-bit ADC samples module voltage, current, and temperature for thermal-derating algorithms. The industrial -40 C to +85 C rating handles outdoor junction-box ambient conditions without needing a thermally isolated enclosure.
Recommended
Digital Welding Power Source
The DSPIC33FJ16GS502-50I/SO is used in inverter-based MIG, TIG, and stick-welding power sources where arc stability depends on a fast digital control loop regulating current and voltage. The high-speed analog comparators detect arc ignition and short-circuit transitions within a single PWM period, and the four PWM outputs drive a full H-bridge inverter stage at switching frequencies between 20 kHz and 100 kHz. The 10-bit ADC samples arc voltage and current at 4 Msps, enabling fine-grained control over pulse welding waveforms (peak current, background current, pulse frequency) for premium process quality. The 16 KB Flash stores waveform presets plus adaptive-process algorithms, and the 28-SOIC footprint is small enough to fit into the auxiliary-control PCB alongside the high-current power stage without crowding the high-voltage isolation barriers.
Recommended
Class-D Audio Amplifier Power Stage Controller
The DSPIC33FJ16GS502-50I/SO can act as the modulator and protection controller for high-efficiency Class-D audio amplifiers, where the four high-speed PWM outputs drive a complementary MOSFET output stage via a gate driver and the high-speed analog comparators perform over-current and over-temperature protection on the speaker lines. The 50 MIPS CPU runs a self-oscillating or fixed-frequency PWM modulator with closed-loop feedback through the 10-bit ADC, while the 2 KB SRAM holds buffer state for the audio sample pre-processing and DC-blocking filters. The 28-SOIC package suits consumer-audio and professional-installation designs where thermal management of the output stage is decoupled from the small controller footprint.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ16GS502-50I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ16GS502-50I/MM | DSPIC33FJ16GS502T-50I/SO | DSPIC33FJ06GS502-50I/SO | DSPIC33FJ16GS402-50I/SP | DSPIC33FJ16GS502-50I/MX |
|---|---|---|---|---|---|---|
| Package | 28-pin SOIC | 28-pin QFN (MM) | 28-pin SOIC (tape and reel) | 28-pin SOIC | 28-pin SPDIP (SP) | 28-pin PQCC28 (MX) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Speed | 50 MIPS | 50 MIPS | 50 MIPS | 50 MIPS | 50 MIPS | 50 MIPS |
| High-Speed PWM Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| High-Speed Analog Comparators | 4 | 4 | 4 | 4 | 4 | 4 |
| 10-bit DAC Outputs | 2 | 2 | 2 | 2 | 2 | 2 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Four integrated high-speed analog comparators eliminate external current-sense comparator ICs (vs DSPIC33FJ06GS502-50I/SO)
- Dedicated SMPS peripheral set with 1.04 ns PWM resolution in 28 SOIC (vs DSPIC33FJ16GS402-50I/SP)
- Two 10-bit DAC outputs for slope compensation and analog reference (vs DSPIC33FJ16GS502-50I/MX)
Design Notes
Place a low-ESR 10 microfarad ceramic capacitor on the VCAP pin (pin 20) within 5 mm of the IC, plus a parallel 100 nF ceramic for high-frequency decoupling. The internal 1.8 V core LDO will not start up reliably without this bulk capacitance. Use a wide (>= 0.5 mm) trace from VCAP to the capacitor, and route VCAP on the top layer with no vias in the connection path.
Tie AVSS (pin 21) to a clean analog ground island that returns directly to the power-stage bulk capacitor, separate from the noisy digital VSS (pin 8) return path. The ADC and analog comparators share an internal ground reference; if the analog and digital grounds share a high-di/dt switching-current return, current-sense measurements will pick up switching noise of 50 to 100 mV, which corrupts the digital control loop.
Do not leave unused comparator inputs floating - tie unused C*IN+ and C*IN- pins to AVSS through a 10 kohm resistor. Floating comparator inputs cause spurious PWM trips that shut down the converter in normal operation. The PWM outputs default to active-low at reset, so an external pull-down on the gate-driver input is recommended to keep the power stage off until firmware takes control.
Estimated: At 50 MIPS with peripherals active, the DSPIC33FJ16GS502-50I/SO in 28-SOIC dissipates approximately 200 mW. With a theta_JA of approximately 75 C/W for the SOIC-28 wide-body package, junction temperature rise above 25 C ambient is roughly 15 C, well within the 125 C maximum. Even at 85 C ambient, the part operates with adequate margin; no heatsink is required for normal SMPS control designs.
Compliance Information
RoHS compliant per Microchip product page; REACH compliance standard for Microchip dsPIC33F family. AEC-Q100 not applicable - this is a general-purpose industrial MCU/DSC, not an automotive-qualified part. Choose AEC-Q100 qualified dsPIC33CK variants for automotive designs.
