DSPIC33FJ09GS302-I/SS - 16-bit DSC, 40 MIPS, 9KB Flash | Microchip
MPN: DSPIC33FJ09GS302-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.6 | $0.60 |
| 10 | $0.49 | $4.90 |
| 25 | $0.38 | $9.50 |
| 100 | $0.27 | $27.00 |
| 1,000 | $0.17 | $170.00 |
DSPIC33FJ09GS302-I/SS Overview
A Digital Signal Controller combines the compute power of a 16-bit MCU with DSP engine features such as hardware multiply-accumulate and dual operand fetch. In the power-management hierarchy, the GS-series dsPIC33F DSCs sit at the intersection of general-purpose microcontrollers and dedicated SMPS control ICs, executing closed-loop digital power algorithms in firmware instead of fixed analog control loops.
Key differentiating features include a high-speed PWM module purpose-built for switch-mode power supplies, an on-chip high-speed 10-bit ADC capable of simultaneous sampling tied directly to the PWM triggers, and multiple analog comparators enabling cycle-by-cycle current limiting without CPU intervention. The device is explicitly designed for common and multi-loop digital SMPS topologies.
Architecturally, the dsPIC33FJ09GS302 belongs to the GS-series family (documented alongside the dsPIC33FJ06GS001/101A/102A/202A in the Microchip family data sheet DS-75018B) with a modified Harvard RISC core, 5V-tolerant I/O pins on selected pins, in-circuit and in-application programming, and JTAG-compatible boundary scan support per the family documentation.
Typical applications include AC-to-DC converters, DC-to-DC converters, power factor correction (PFC), and uninterruptible power supplies (UPS), plus digitally controlled lighting and battery charging. An interleaved PFC reference design from Microchip demonstrates universal input producing up to 350W of DC output.
When designing with this device, budget the 9 KB Flash carefully: full closed-loop PFC plus housekeeping firmware typically consumes most of it, so choose the larger GS202A family member if code growth is expected. Decouple VDD/AVDD and use the dedicated VCAP pin per datasheet guidance.
This page synthesizes distributor pricing, drop-in same-footprint alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for DSPIC33FJ09GS302-I/SS — 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 DSPIC33FJ09GS302-I/SS (same form factor and footprint) — differing in Operating Temperature, Package, RAM, Core Architecture, Lifecycle Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ09GS302-E/SS
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →DSPIC33FJ06GS202A-I/SS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ06GS202-I/SS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ09GS302-I/SS Maximum Ratings & Electrical Characteristics
| Core Type | 16-bit dsPIC33F RISC with DSP engine |
| Max CPU Speed | 40 MIPS |
| Flash Program Memory | 9 KB |
| RAM | 1 KB |
| Supply Voltage | 3.3 V |
| Package | 28-pin SSOP |
| Operating Temperature | -40C to +85C (I grade) |
| High-Speed PWM | Yes (SMPS-optimized PWM module) |
| ADC | High-speed on-chip ADC |
| Comparators | On-chip analog comparators |
| I/O Sink/Source Current | 18 mA on 8 pins, 6 mA on 13 pins (family spec) |
| 5V Tolerant Pins | Yes (selected pins, family spec) |
| Programming | In-Circuit (ICSP) and In-Application Programming |
| Debug/JTAG | IEEE 1149.2 compatible boundary scan (family feature) |
| Safety Library | Class B Safety Library planned (family feature) |
| Mounting Type | Surface Mount |
| Packaging | Tube |
DSPIC33FJ09GS302-I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input / programming voltage |
| Pin 2 | AN0/VREF+/CN2/RB0 — Analog input 0 / positive voltage reference / change notification |
| Pin 3 | AN1/VREF-/CN3/RB1 — Analog input 1 / negative voltage reference / change notification |
| Pin 4 | AN2/SS1/CN4/RB2 — Analog input 2 / SPI slave select / change notification |
| Pin 5 | AN3/INDX/CN5/RB3 — Analog input 3 / QEI index input / change notification |
| Pin 6 | AN4/QEA/IC7/CN6/RB4 — Analog input 4 / QEI phase A / input capture 7 |
| Pin 7 | VDD — Positive supply for core logic |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/CN30/RA2 — Crystal oscillator input / external clock input |
| Pin 10 | OSC2/CLKO/CN29/RA3 — Crystal oscillator output / clock output |
| Pin 11 | AN5/QEB/IC8/CN7/RB5 — Analog input 5 / QEI phase B / input capture 8 |
| Pin 12 | AN6/OCFA/IC9/CN8/RB6 — Analog input 6 / PWM fault A / input capture 9 |
| Pin 13 | AN7/IC10/CN9/RB7 — Analog input 7 / input capture 10 / change notification |
| Pin 14 | VDD — Positive supply for I/O |
| Pin 15 | VSS — Ground reference |
| Pin 16 | AN8/RP15/CN10/RB8 — Analog input 8 / remappable peripheral pin 15 |
| Pin 17 | AN9/RP14/CN11/RB9 — Analog input 9 / remappable peripheral pin 14 |
| Pin 18 | AN10/RP13/CVREF/CN12/RB10 — Analog input 10 / comparator voltage reference output / remappable pin |
| Pin 19 | AN11/RP12/CN13/RB11 — Analog input 11 / remappable peripheral pin 12 |
| Pin 20 | AN12/RP11/CN14/RB12 — Analog input 12 / remappable peripheral pin 11 |
| Pin 21 | AN13/RP10/CN15/RB13 — Analog input 13 / remappable peripheral pin 10 |
| Pin 22 | AN14/C1IN-/RP9/CN16/RB14 — Analog input 14 / comparator 1 inverting input / remappable pin |
| Pin 23 | AN15/C1IN+/RP8/CN17/RB15 — Analog input 15 / comparator 1 non-inverting input / remappable pin |
| Pin 24 | AVDD — Positive supply for analog modules |
| Pin 25 | AVSS — Ground reference for analog modules |
| Pin 26 | RP2/PGEC3/CN22 — Remappable peripheral pin 2 / programming clock 3 |
| Pin 27 | RP3/PGED3/CN23 — Remappable peripheral pin 3 / programming data 3 |
| Pin 28 | VCAP/VDDCORE — CPU core voltage filter capacitor connection |
Typical Applications
DSPIC33FJ09GS302-I/SS is suitable for 6 applications: AC-DC Converter Control, Power Factor Correction (PFC), DC-DC Converter Control, Uninterruptible Power Supplies (UPS), Digital Lighting and LED Drivers, Motor Control and Embedded DSP Systems.
AC-DC Converter Control
The DSPIC33FJ09GS302-I/SS is purpose-built for digitally controlled AC-DC conversion, pairing a 40 MIPS 16-bit core with a high-speed PWM whose resolution and dead-time control suit flyback, forward, and LLC topologies. The on-chip high-speed ADC samples output voltage and current synchronized to the PWM period, closing the control loop in firmware with no external analog compensator. On-chip comparators provide cycle-by-cycle overcurrent limiting even if firmware stalls. The 9 KB Flash holds the compensator plus housekeeping, and the 28-pin SSOP fits compact power supplies where a microcontroller-grade price point matters.
Recommended
Power Factor Correction (PFC)
For PFC stages, the DSPIC33FJ09GS302-I/SS delivers the tight ADC-to-PWM latency that boost-converter current shaping requires. Microchip's interleaved PFC reference design for this family operates from universal AC input and produces up to 350W of regulated high-voltage DC output, demonstrating the exact control topology. The 40 MIPS core executes average-current-mode compensation at switching frequency rates, while the comparators guard against inrush and overcurrent. Operating from a single 3.3V rail with 5V-tolerant inputs on selected pins simplifies interfacing with the rectification and sensing front end in offline power designs.
Recommended
DC-DC Converter Control
In DC-DC applications such as buck, boost, and half-bridge converters, the DSPIC33FJ09GS302-I/SS replaces fixed analog controllers with programmable control: switching frequency, dead time, slope compensation, and fault thresholds are all set in firmware. The high-speed PWM supports complementary outputs with dead-band insertion, and the high-speed ADC triggers at user-selectable points within the PWM cycle for clean mid-rail sampling. The 3.3V, 28-pin SSOP device draws modest quiescent power for standby efficiency targets, and in-application programming allows field firmware updates of the control law without a service visit.
Recommended
Uninterruptible Power Supplies (UPS)
UPS systems combine an inverter, a battery charger, and transfer logic - a workload the DSPIC33FJ09GS302-I/SS handles with its DSP engine performing sinusoidal inverter modulation while the high-speed PWM generates the switching pattern. The high-speed ADC samples AC output and battery current for closed-loop voltage regulation and charging control, and the analog comparators implement hardware-level fault trips for short-circuit events. The Class B safety library planned for the family and JTAG boundary scan support functional-safety documentation. At 40 MIPS the core has margin for both the inverter loop and system supervisory tasks.
Recommended
Digital Lighting and LED Drivers
Digitally controlled LED drivers benefit from the DSPIC33FJ09GS302-I/SS because dimming curves, constant-current regulation, and fault handling are all firmware parameters rather than analog component values. The high-speed PWM produces the main switching channel plus a separate dimming PWM, while the ADC tracks output current for precise constant-current loops with the comparators providing per-cycle protection against LED string shorts. The 28-pin SSOP occupies minimal board area inside lamp housings, the 3.3V supply integrates with standard bias rails, and remappable peripheral pins (RPx) ease PCB routing in dense lighting ballasts.
Recommended
Motor Control and Embedded DSP Systems
Beyond power conversion, the DSPIC33FJ09GS302-I/SS drives small motors: per the Component Search Engine product data, the DSP core, high-speed PWM outputs, Quadrature Encoder Interface (QEI), and Motor Control PWM support BLDC and PMSM control. The 40 MIPS DSP engine executes Clarke/Park transforms and PI loops for field-oriented control of low-power motors, while the ADC synchronizes phase-current sampling to the PWM center. Five-volt-tolerant inputs interface directly with hall sensors and gate-driver logic. The 28-pin SSOP suits compact drives such as fans, pumps, and small appliances needing sensor or sensorless commutation.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ09GS302-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ09GS302-E/SS | DSPIC33FJ06GS202A-I/SS | DSPIC33FJ09GS302-I/MM | DSPIC33FJ09GS302-I/SP |
|---|---|---|---|---|---|
| Package | SSOP-28 | SSOP-28 - same | SSOP-28 - same | QFN-28 - different | SPDIP-28 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 9 KB | 9 KB | 6 KB | 9 KB | 9 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| CPU Speed | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS |
| Operating Temperature | -40C to +85C | -40C to +125C (extended) | -40C to +85C | -40C to +85C | -40C to +85C |
| SMPS High-Speed PWM | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- SMPS-optimized high-speed PWM with ADC synchronization (vs PIC18F1220-I/SS)
- 25 percent more program memory than family sibling (vs DSPIC33FJ06GS202A-I/SS)
- Extended-temperature option on the same footprint (vs DSPIC33FJ09GS302-E/SS)
- Trade-off: compact memory versus newer dsPIC33C family (vs DSPIC33EV32GM002-I/SS)
Design Notes
Supply decoupling: place 100 nF ceramic capacitors directly across each VDD/VSS pair (pins 7/8 and 14/15) and across AVDD/AVSS (pins 24/25), with a 4.7 uF to 10 uF bulk capacitor nearby. The VCAP/VDDCORE pin (28) requires the datasheet-specified low-ESR capacitor to stabilize the internal 2.5V core regulator - an incorrect or missing VCAP capacitor is the most common cause of erratic reset behavior on dsPIC33F designs. Estimated: keep trace inductance low by routing decouplers as short as possible; the analog AVDD rail should be fed through an RC filter (e.g., 10 ohm + 1 uF) from the digital rail to reduce ADC noise.
In SMPS layouts, separate the analog ground (AVSS) from the power-switching ground and tie them at a single star point near the controller. Route the high-speed PWM outputs to gate drivers away from the ADC sense lines; the synchronized sampling means any switching noise coupled into ANx pins appears directly in the control loop. Keep the oscillator (pins 9/10) loop area minimal and away from PWM traces. The remappable RPx pins (16-23, 26-27) let you move peripherals to convenient pads - assign UART/SPI/IC functions during layout rather than fixing them in firmware first.
Three recurring pitfalls with the dsPIC33FJ09GS302: (1) Flash budget - 9 KB fills quickly with PFC plus soft-start plus fault handling; compile early and verify headroom before committing, or select the pin-compatible GS202A only if 6 KB suffices. (2) Package confusion - the -I/SS (SSOP-28), -I/MM (QFN-28), and -I/SP (SPDIP-28) share the same die but are NOT interchangeable on a PCB; order the correct suffix. (3) MCLR pin 1 must not be left floating; a 10 kohm pull-up plus the ICSP connector is required for in-circuit programming and reliable startup.
Estimated: at 40 MIPS the dsPIC33FJ09GS302 core current is on the order of tens of milliamps, so internal dissipation is well under 0.2 W in typical SMPS duty. The 28-SSOP package on a standard 4-layer board requires no heatsink or thermal vias for the controller itself. Verify with the current-vs-MIPS curves in the DS-75018B family data sheet for your clock configuration; the dominant thermal design effort belongs to the power stage, not the DSC.
Compliance Information
RoHS/REACH/lead-free status was not explicitly stated in the verified web data; confirm on the official Microchip product page (microchip.com/en-us/product/dsPIC33FJ09GS302) or request a certificate of conformance. The LCSC listing for a family member (DSPIIC33FJ09GS302-I/SP) references AEC-Q100 Rev G Grade 1 planning and IEC 60730 Class B safety library at family level.
