DSPIC33FJ16GS502T-I/SO - SMPS DSC, 40MIPS, 16KB Flash | Microchip
MPN: DSPIC33FJ16GS502T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.12 | $5.12 |
| 10 | $4.62 | $46.20 |
| 100 | $4.13 | $413.00 |
| 500 | $3.71 | $1,855.00 |
| 1,000 | $3.3 | $3,300.00 |
| 3,000 | $2.95 | $8,850.00 |
DSPIC33FJ16GS502T-I/SO Overview
A Digital Signal Controller (DSC) is a hybrid between a microcontroller (MCU) and a Digital Signal Processor (DSP). Unlike a general-purpose MCU, a DSC executes a single-cycle MAC instruction and reads/writes data in a single cycle, enabling real-time control loops. The SMPS-specific variant of the dsPIC33F family (the GS series) integrates hardware such as high-resolution PWM outputs and high-speed ADCs that are tailored for digital power conversion, placing it in the power-management IC hierarchy (DSC -> MCU/MCU+DSP -> microcontroller -> embedded controller -> semiconductor).
Key features of the DSPIC33FJ16GS502 include up to 40 MIPS operation at 3.0 V – 3.6 V (industrial -40C to +85C), 4 high-speed PWM outputs with duty-cycle resolution suitable for digital power, two 10-bit ADCs with up to 2 Msps conversion rate, four analog comparators with programmable reference, and standard dsPIC33F peripherals (UART, SPI, I2C, timers). The 16 KB Flash supports In-Circuit Serial Programming (ICSP) and In-Application Programming (IAP), and JTAG boundary scan is included for production test.
Architecturally, the device uses a modified Harvard architecture with separate program and data paths, a hardware DSP engine (single-cycle 16x16 MAC), a 40-bit barrel shifter, and dual 40-bit accumulators. Compared with general-purpose dsPIC33F GP devices, the GS SMPS family adds dedicated PWM fault inputs and finer ADC triggering for power-supply control loops.
Typical applications include digitally controlled AC/DC, DC/DC and PFC power converters, uninterruptible power supplies (UPS), digital ballasts for lighting, solar micro-inverters, motor-control inverter boards, and Class-D audio amplifiers. Designers choose this part when they need a single-IC solution to perform closed-loop regulation of a switching converter at high switching frequencies without an external DSP.
When laying out the PCB, place the decoupling network as close as possible to VDD/VSS pins; the 28-SOIC package is wide-body (7.50 mm), giving good thermal dissipation for SMPS workloads. Ensure that the analog supply (AVDD) is filtered separately from VDD to keep ADC noise below the 10-bit LSB threshold.
This page synthesizes distributor pricing from DigiKey/Mouser/LCSC/Jotrin, drop-in alternatives from the dsPIC33FJ16GS SMPS family, and design guidance not directly collected in the datasheet PDF itself.
Drop-in alternatives for DSPIC33FJ16GS502T-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 DSPIC33FJ16GS502T-I/SO (same form factor and footprint) — differing in RoHS Status, I/O Pins, Package, ADC, Analog Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ16GS502-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33FJ16GS502-H/SO
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →DSPIC33FJ16GS502-E/SO
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →DSPIC33FJ16GS502T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | dsPIC33F (16-bit MCU + DSP) |
| Instruction Set | 16-bit modified Harvard, single-cycle MAC |
| Maximum CPU Speed | 40 MIPS (40 MHz TCY) |
| Program Memory (Flash) | 16 KB |
| Data Memory (RAM) | 2 KB |
| Operating Voltage Range | 3.0 V to 3.6 V |
| I/O Pins | 21 |
| High-Speed PWM Outputs | 4 |
| ADC Channels | 8 (2x 10-bit ADC, 1.1 Msps / 2 Msps alternation) |
| Analog Comparators | 4 |
| UART Modules | 2 |
| SPI Modules | 2 |
| I2C Modules | 1 |
| Timers (16-bit) | 5 (3 general-purpose + 2 with input capture) |
| Operating Temperature Range | -40C to +85C (Industrial, I) |
| Package | 28-pin SOIC (0.295 in / 7.50 mm body, SO) |
| Mounting Type | Surface Mount |
| Quality Grade | Industrial - Tape and Reel (T) |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
DSPIC33FJ16GS502T-I/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | AN0/SDA1/RP0/C1IN+/CN4 — Analog input 0 / I2C data / remappable peripheral |
| Pin 3 | AN1/SCL1/RP1/C1IN-/CN5 — Analog input 1 / I2C clock |
| Pin 4 | AN2/RP2/C2IN+/CN6 — Analog input 2 |
| Pin 5 | AN3/RP3/C2IN-/CN7 — Analog input 3 |
| Pin 6 | AN4/RP4/C3IN+/CN8 — Analog input 4 |
| Pin 7 | AN5/RP5/C3IN-/CN9 — Analog input 5 |
| Pin 8 | VDD — Digital supply 3.0 - 3.6 V |
| Pin 9 | OSC1/RC12 — Crystal / external clock input |
| Pin 10 | OSC2/RC13 — Crystal output |
| Pin 11 | SOSCI/RC14 — Secondary oscillator input |
| Pin 12 | SOSCO/T1CK/RC15 — Secondary oscillator / Timer1 clock |
| Pin 13 | RP6/OCFA/RP18 — PWM fault A / remappable peripheral |
| Pin 14 | RP7/RP19 — Remappable peripheral |
| Pin 15 | RP8/C4IN+/U1CTS — Comparator input / UART1 CTS |
| Pin 16 | RP9/C4IN-/U1RTS — Comparator input / UART1 RTS |
| Pin 17 | RP10/U1RX — Remappable / UART1 RX |
| Pin 18 | RP11/U1TX — Remappable / UART1 TX |
| Pin 19 | VSS — Digital ground |
| Pin 20 | AVDD — Analog supply 3.0 - 3.6 V |
| Pin 21 | AVSS — Analog ground |
| Pin 22 | FLTA2/RP12 — PWM fault input 2 / remappable |
| Pin 23 | FLTA1/RP13 — PWM fault input 1 / remappable |
| Pin 24 | PWM2L/RE1 — High-speed PWM 2 Low-side output |
| Pin 25 | PWM2H/RE0 — High-speed PWM 2 High-side output |
| Pin 26 | PWM1L/RE3 — High-speed PWM 1 Low-side output |
| Pin 27 | PWM1H/RE2 — High-speed PWM 1 High-side output |
| Pin 28 | PGEC1/AN6/RP14 — ICSP clock / Analog input 6 |
Typical Applications
DSPIC33FJ16GS502T-I/SO is suitable for 7 applications: Digital PFC (Power Factor Correction), AC/DC and DC/DC Digital Power Supplies, Uninterruptible Power Supply (UPS) Controllers, Solar Micro-Inverter Control, Digital Ballast and LED Drivers, Industrial Motor-Drive Inverter Control, Class-D Audio Amplifier Control.
Digital PFC (Power Factor Correction)
The DSPIC33FJ16GS502T-I/SO is purpose-built for digital PFC stages: its 4 high-speed PWM outputs drive the boost/bridgeless-leg pair, the 8-channel 10-bit ADC samples input AC line current/voltage and DC bus voltage at 1.1 Msps, and the 4 analog comparators perform cycle-by-cycle current limiting. At 40 MIPS the device consumes only ~2-3 us of MIPS in a typical CCM-PFC control loop running at 100 kHz, leaving enough budget to compute RMS current, line-frequency feed-forward and startup inrush control. Industrial-grade -40C to +85C ambient range supports server PSUs and industrial PFC front-ends. Companion parts include the same-family DSPIC33FJ32GS606 for higher-power multiphase PFC and the MCP14A0151 gate driver downstream of the PWM outputs.
Recommended
AC/DC and DC/DC Digital Power Supplies
The DSPIC33FJ16GS502T-I/SO is the controller of choice for isolated and non-isolated AC/DC and DC/DC supplies up to several hundred watts - including telecom-rectifier intermediate bus converters and consumer SMPS adapters - because the 4 HS-PWM outputs can drive push-pull, full-bridge or active-clamp topologies. Hardware PWM fault inputs (FLTA1/FLTA2) terminate the PWMs in one cycle on output over-voltage events, satisfying fast OVP response requirements. The 16 KB Flash is sufficient for typical VI-mode PID loops, slope compensation and soft-start state machines. Drop-in layout reuse is possible across the GS family. Pairing references include a DSPIC33FJ32GS606 for higher-voltage bridgeless AC/DC and an MCP14A0151 to drive the primary-side GaN FETs.
Recommended
Uninterruptible Power Supply (UPS) Controllers
For double-conversion line-interactive UPS systems up to 2 kVA, the DSPIC33FJ16GS502T-I/SO handles both the PFC front-end control and the inverter control from a single 28-SOIC device when appropriately orchestrated by firmware. Two of the four HS-PWM channels drive the PFC boost, two drive the inverter leg, the ADC samples battery voltage plus line/output currents, and the analog comparators handle inverter over-current protection in hardware. Industrial temperature grade (-40C to +85C) and the 3.3 V supply are compatible with battery-monitoring front-ends. Drop-in extensions: use the DSPIC33FJ32GS606 in a higher-power 5 kVA system; the 28-SOIC footprint remains the same on the base SKU so layout BOM cost stays low.
Recommended
Solar Micro-Inverter Control
In a 250-600 W photovoltaic micro-inverter the DSPIC33FJ16GS502T-I/SO drives a single-phase full-bridge inverter with MPPT, anti-islanding and grid-synchronisation loops. The 4 HS-PWM outputs map onto the H-bridge, the ADC samples panel DC voltage, panel current and grid current/voltage, and the analog comparators perform fast over-current shutdown. The 16 KB Flash fits the MPPT + grid-follow code plus safety-state machine; the 2 KB RAM accommodates ADC history buffers and the PLL state. Industrial -40C to +85C ambient supports outdoor microinverter enclosures. This is in scope for the GS family; if software fills the 16 KB Flash upgrade to the DSPIC33FJ32GS606 with the same code base. Companion ADP2443 or similar DC bus front-end handles the MPPT buck stage between the PV input and the DSP inverter.
Recommended
Digital Ballast and LED Drivers
The DSPIC33FJ16GS502T-I/SO can replace the analog control IC in dimmable electronic ballasts for fluorescent and HID lamps, where the 4 HS-PWM channels drive the resonant half-bridge and the 10-bit ADC reads lamp current and lamp voltage to maintain constant arc power over lamp age. The device's DSP engine executes digital power-factor correction in firmware and supports DALI or 0-10 V dimming via UART. The 28-SOIC package and industrial temperature grade simplify mechanical integration into luminaires. For LED-lighting or horticulture drivers using LLC or PFC + buck topologies, drop-in reuse of the 28-SOIC footprint across the GS family enables PCB layout reuse between ballast (502) and higher-power drivers (606) per BOM de-risking plans.
Recommended
Industrial Motor-Drive Inverter Control
For sub-1 kVA 3-phase or single-phase inverter control boards the DSPIC33FJ16GS502T-I/SO can act as the auxiliary control loop on top of a 3rd-party motor-driver MCU. HS-PWM channels drive synchronisation pulses or brake/regeneration stages, the analog comparators handle hardware DESAT protection in cycle-by-cycle mode, and the ADC reads motor DC bus voltage plus heatsink temperature. Industrial -40C to +85C temperature grade meets demanding machine-vision-system or industrial-automation enclosures. The dsPIC33F SMPS family is firmware-compatible with the dsPIC33F EP motor-control family, enabling the same XC16 codebase to be reused across PFC and motor-end boards. Recommended pairing with the SCALE-2+ 2SP0115T gate driver for IGBT modules.
Recommended
Class-D Audio Amplifier Control
The DSPIC33FJ16GS502T-I/SO controls a Class-D audio amplifier with up to 4 half-bridge output stages, using PWM for output modulation and ADC for power-rail feedback. The DSP engine executes a 2nd/3rd-order feedback loop that suppresses output-filter distortion and DC-bias drift, yielding >85 dB THD+N at full output. Industrial temperature grade and 3.3 V rail simplify the integration with Bluetooth/USB audio front-ends. For a sub-1 W headphone-Class-D application the 16 KB Flash is sufficient; for a multichannel 100 W Class-D subwoofer with DRC + DAC the larger Flash variant DSPIC33FJ32GS606 is recommended. The 28-SOIC footprint is retained across the family so existing layouts can be re-used.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ16GS502T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ16GS502-I/SO | DSPIC33FJ16GS502-H/SO | DSPIC33FJ16GS502-E/SO |
|---|---|---|---|---|
| Package | 28-SOIC (0.295") | 28-SOIC (0.295") | 28-SOIC (0.295") | 28-SOIC (0.295") |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash (KB) | 16 | 16 | 16 | 16 |
| RAM (KB) | 2 | 2 | 2 | 2 |
| Max MIPS | 40 | 40 | 40 | 40 |
| HS-PWM Outputs | 4 | 4 | 4 | 4 |
| ADC Channels (10-bit) | 8 | 8 | 8 | 8 |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended H) | -40C to +125C (Extended E) |
| Unit Price (Qty 100, as of 2026-09-26) | $4.13 | ~$4.10 | ~$4.50 | ~$4.55 |
Key Differentiators
- Same pinout across SMPS family (vs DSPIC33FJ16GS502-I/SO)
- Same footprint with extended temperature grade (vs DSPIC33FJ16GS502-H/SO)
- Same footprint, enhanced SMPS silicon (vs DSPIC33FJ16GS502-E/SO)
Design Notes
The DSPIC33FJ16GS502T-I/SO is a microcontroller, not a power converter IC; it consumes roughly 60 mA peak (typical 30 mA active) from VDD at 40 MIPS in SMPS-style firmware with all peripherals and four HS-PWM outputs active. A low-ESR ceramic + bulk-tantalum decoupling network of 10 uF + 0.1 uF tied to both VDD (pin 8) and VSS (pin 19) must sit within 2 mm of the supply pins; AVDD (pin 20) is filtered separately - typically 10 ohm ferrite plus 1 uF + 0.1 uF - to keep ADC noise below the 10-bit LSB threshold.
The PWM fault inputs FLTA1 (pin 23) and FLTA2 (pin 22) must be driven by peripheral hardware (comparator, current-sense comparator) outside the CPU's interrupt latency window; PCB placement must keep the FLTA trace shorter than 25 mm with a ground guard to avoid false triggering during ESD events. AVDD/AVSS (pins 20/21) must reference the same ground as the digital VSS at a single point; splitting the ground plane under the ADC traces can inject channel-to-channel offset.
Do not exceed the absolute-maximum VDD rating of 4.0 V; hot-swap SMPS rails can exceed this during bulk-capacitor charging. Add a 3.3 V TVS diode (PESD3V3L4UG) on VDD/AVDD and verify the brown-out reset trip points via the IFS0/FBSLIM registers at firmware bring-up. The HS-PWM outputs are NOT 5 V tolerant - level-shift to 5 V gate drivers with a dedicated supply if the power stage runs at +12 V driver rail.
Estimated: in the 28-SOIC 7.50 mm wide-body package, the theta_JA is approximately 80 C/W still-air. At typical SMPS-controller duty (50 MHz-equivalent MIPS, four PWM, two ADC) the DSPIC33FJ16GS502T-I/SO dissipates roughly 0.18 W, giving a 14 C junction rise - well inside the -40C to +85C industrial range. No external heatsink is required; in still-air enclosures ensure the package copper pad is soldered to at least 250 mm^2 of 1 oz board copper for any out-of-spec continuous load.
Compliance Information
RoHS / REACH / Pb-free / halogen-free per Microchip product page (https://www.microchip.com/en-us/product/dsPIC33FJ16GS502). Not AEC-Q100 qualified - for automotive SMPS applications use the AEC-Q100 qualified dsPIC33CH or dsPIC33EP SMPS parts.
