DSPIC33FJ16GS502T-I/MM - 40 MIPS 16-bit DSC, 16KB Flash | Microchip
MPN: DSPIC33FJ16GS502T-I/MM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.99 | $4.99 |
| 10 | $4.49 | $44.90 |
| 100 | $3.79 | $379.00 |
| 500 | $3.21 | $1,605.00 |
| 1,000 | $2.83 | $2,830.00 |
DSPIC33FJ16GS502T-I/MM Overview
What is a Digital Signal Controller (DSC)? A DSC is a hybrid of a microcontroller (MCU) and a digital signal processor (DSP): the MCU side brings deterministic interrupt-driven control, while the DSP side delivers single-cycle MAC operations, hardware barrel-shifter loops and zero-overhead DO/REPEAT primitives. In the hierarchy, a DSC sits between a generic 16-bit MCU and a full DSP, under the parent category of power-management ICs / embedded control ICs and the broader domain of microcontrollers. This makes DSCs the controller-of-record for switch-mode power supplies, motor control and digital lighting, where deterministic sub-microsecond response is mandatory.
Key features include 40 MIPS CPU performance at 3.3V, an internal 7.37 MHz RC oscillator with PLL options up to 80 MHz, 21 general-purpose timers, four DMA channels, two UART, one SPI, one I2C, and a JTAG/ICD debug port. The integrated peripherals are tailored for digital-power feedback: up to 4 PWM outputs with 1.1 ns edge resolution, three high-speed analog comparators and dual SAR ADCs sharing up to 13 input channels.
Architecturally, the device combines a 16-bit modified-Harvard CPU with a hardware DSP engine, dedicated motor/PWM control logic, dual SAR ADCs and a flexible interrupt controller with a 5-deep shadow register set for low-latency context save/restore. The exposed thermal pad on the QFN package reduces θJA to roughly 30 C/W on a 4-layer JEDEC EIA/JESD51 test board, enabling higher PWM duty-cycle operation in thermally tight enclosures.
Typical applications include digital switch-mode power supplies (SMPS), DC-DC converters, power-factor correction (PFC), uninterruptible power supplies (UPS), induction cooking, digital LED lighting, and BLDC/PMSM motor drives. It is also used in solar micro-inverters and plasma/solenoid drivers where fast current-loop response is required.
When designing with this device, keep analog ground and digital ground separated and joined only at the exposed pad to minimize switching noise coupling into ADC inputs; place the PLL bypass capacitors within 2 mm of the VDD/VCAP/AVDD pins, and derate PWM output current to stay within the package dissipation budget at full switching frequency. For AEC-Q100 automotive usage, verify whether a -E variant is in scope, because the -I suffix here is industrial-grade (-40 to +85 C), not automotive-qualified.
This page synthesizes distributor inventory, AEC-Q100 context, drop-in package siblings, and practical layout/decoupling notes not gathered in any single manufacturer document.
Drop-in alternatives for DSPIC33FJ16GS502T-I/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 DSPIC33FJ16GS502T-I/MM (same form factor and footprint) — differing in ADC, Analog Comparators, Package, Mounting Type, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33FJ16GS504-I/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ06GS502-I/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33FJ16GS502-I/MM
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →DSPIC33FJ16GS502T-E/MM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP64GS805-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.48 / Unit
View Datasheet →DSPIC33FJ16GS502T-I/MM Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC33F modified Harvard with DSP engine |
| CPU Speed | 40 MIPS at 3.3 V |
| Program Memory (Flash) | 16 KB |
| RAM | 2 KB |
| Operating Voltage (VDD) | 3.0 V to 3.6 V |
| ADC | Dual 10-bit SAR, up to 13 input channels, ~2 Msps |
| PWM Channels | Up to 4 outputs, ~1.1 ns edge resolution (High-Speed PWM) |
| Analog Comparators | 3 on-chip high-speed comparators |
| Communication | 2x UART, 1x SPI, 1x I2C |
| Timers | 5x 16-bit and 2x 32-bit timer/counter modules (general purpose) |
| DMA Channels | 4 |
| Debug Interface | JTAG / ICD (In-Circuit Debugger) |
| Operating Temperature Range | -40 C to +85 C (Industrial, -I suffix) |
| Package | 28-pin QFN-S (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount, Tape & Reel (T suffix) |
| RoHS Status | Compliant |
DSPIC33FJ16GS502T-I/MM Pin Configuration
| Pin 1 | RP15/PWM2H/PMD5 — Remappable IO / PWM2H output / Parallel Master Port data |
| Pin 2 | RP14/PWM2L/PMD4 — Remappable IO / PWM2L output / Parallel Master Port data |
| Pin 3 | RP13/PMD3 — Remappable IO / Parallel Master Port data |
| Pin 4 | RP12/PMD2 — Remappable IO / Parallel Master Port data |
| Pin 5 | RP11/PMD1 — Remappable IO / Parallel Master Port data |
| Pin 6 | RP10/PMD0 — Remappable IO / Parallel Master Port data |
| Pin 7 | VSS — Digital ground |
| Pin 8 | RP9/PWM1H — Remappable IO / PWM1H output |
| Pin 9 | RP8/PWM1L — Remappable IO / PWM1L output |
| Pin 10 | RP7/AN7 — Remappable IO / ADC analog input 7 |
| Pin 11 | RP6/OC1/AN6 — Remappable IO / Output Compare 1 / ADC analog input 6 |
| Pin 12 | RP5/AN5 — Remappable IO / ADC analog input 5 |
| Pin 13 | RP4/AN4 — Remappable IO / ADC analog input 4 |
| Pin 14 | RP3/AN3 — Remappable IO / ADC analog input 3 |
| Pin 15 | RP2/AN2/C2IN+ — Remappable IO / ADC analog input 2 / Comparator 2 non-inverting input |
| Pin 16 | RP1/AN1/C1IN+ — Remappable IO / ADC analog input 1 / Comparator 1 non-inverting input |
| Pin 17 | RP0/AN0/C3IN+ — Remappable IO / ADC analog input 0 / Comparator 3 non-inverting input |
| Pin 18 | AVSS — Analog ground |
| Pin 19 | AVDD — Analog supply (3.0 V to 3.6 V) |
| Pin 20 | MCLR — Master Clear reset input (active low) |
| Pin 21 | VDD — Digital supply (3.0 V to 3.6 V) |
| Pin 22 | PGC — ICSP clock / ICD |
| Pin 23 | PGD — ICSP data / ICD |
| Pin 24 | VCAP — Voltage regulator decoupling capacitor output |
| Pin 25 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 26 | OSC2/CLKOUT — Crystal oscillator output / system clock output |
| Pin 27 | TMS — JTAG Test Mode Select |
| Pin 28 | TCK — JTAG Test Clock |
| Pin EP | EP — Exposed thermal pad - connect to VSS for thermal dissipation |
Typical Applications
DSPIC33FJ16GS502T-I/MM is suitable for 7 applications: Digital Switch-Mode Power Supply (SMPS), Power Factor Correction (PFC), BLDC / PMSM Motor Drives, Digital LED Lighting / Drivers, Solar Micro-Inverters and String Inverters, Induction Cooking and Plasma/Solenoid Drivers, Uninterruptible Power Supplies (UPS).
Digital Switch-Mode Power Supply (SMPS)
The DSPIC33FJ16GS502T-I/MM is engineered for closed-loop digital control of switch-mode power supplies. Its 40 MIPS dsPIC33F core executes voltage-mode and peak-current-mode control at switching frequencies from 50 kHz to 1 MHz, while the four PWM channels with ~1.1 ns edge resolution drive MOSFET half-bridges with deterministic dead-band insertion. The dual 10-bit SAR ADC sampling at ~2 Msps captures output voltage and inductor current on a cycle-by-cycle basis, and the three on-chip analog comparators enable hardware-cycle-by-cycle current limiting as a hardware safety net. At a typical 3.3 V/3.6 V rail with 200 kHz PWM, junction temperature rise is well within the 28-pin QFN-S thermal budget; derate to 2 A or below for higher switching frequencies.
Recommended
Power Factor Correction (PFC)
The DSPIC33FJ16GS502T-I/MM implements digital PFC for boost converters up to several hundred watts at universal mains input. The high-speed PWM with 1.1 ns edge resolution produces the 50-100 kHz boost switch control, while the on-chip comparator performs cycle-by-cycle overcurrent limiting, eliminating the need for an external PFC controller IC. The dual ADC samples the AC line voltage, inductor current and output DC bus simultaneously, enabling average-current-mode control with THD well below 10 percent and PF above 0.99 at full load. The 16 KB Flash and 2 KB RAM are sufficient for a digital-PFC algorithm with soft-start, input voltage feed-forward and dynamic load step response.
Recommended
BLDC / PMSM Motor Drives
The DSPIC33FJ16GS502T-I/MM is well suited to sensorless or Hall-sensor BLDC and PMSM motor control in the 50 W to 500 W range, such as ceiling fans, pumps, drones and small e-bikes. Its four high-speed PWM outputs drive a three-phase inverter with one channel available for synchronous braking or PFC. The dual 10-bit ADC samples the three phase currents via low-side shunt resistors, while the on-chip comparators perform hardware overcurrent protection at the PWM level. The dsPIC33F DSP engine executes the Park/Clarke transforms and PI current loop in fewer than 20 instruction cycles per PWM period, well within the 40 MIPS budget.
Recommended
Digital LED Lighting / Drivers
Digital LED drivers using the DSPIC33FJ16GS502T-I/MM deliver individually dimmed multi-channel LED strings with high-frequency PWM dimming to avoid flicker. The four PWM outputs can drive four LED channels at up to ~1 MHz, with 16-bit resolution dimming to support smooth brightness transitions. The dual ADC samples each channel current to implement constant-current regulation, while the comparator performs fast overcurrent shutdown. 16 KB Flash easily fits a multi-channel color-mixing or tunable-white algorithm with DMX-512 or 0-10 V input decoding, and the 2 KB RAM is enough to maintain state for up to four channels simultaneously.
Recommended
Solar Micro-Inverters and String Inverters
In solar micro-inverter and small string-inverter applications, the DSPIC33FJ16GS502T-I/MM performs MPPT and grid-tie control loops at switching frequencies of 50-100 kHz. The high-speed PWM drives the full-bridge unfolding stage with deterministic dead-band, while the on-chip ADC samples the panel voltage/current and the AC line voltage for anti-islanding detection. The DSP engine executes perturb-and-observe or incremental-conductance MPPT at every PWM cycle with negligible CPU overhead, and the on-chip comparator provides cycle-by-cycle current protection. 16 KB Flash is sufficient for MPPT plus basic grid-tie firmware; production designs often step up to the DSPIC33FJ16GS504 or DSPIC33EP64GS805 for additional safety routines.
Recommended
Induction Cooking and Plasma/Solenoid Drivers
Induction cooking and plasma/solenoid drivers benefit from the DSPIC33FJ16GS502T-I/MM's high-speed PWM with ~1.1 ns edge resolution and cycle-by-cycle current-mode protection. The four PWM outputs drive a resonant LLC or phase-shifted full-bridge inverter at switching frequencies of 20-200 kHz, while the three on-chip comparators monitor resonant-capacitor voltage and overcurrent for sub-microsecond hardware shutdown. The DSP engine executes adaptive frequency tracking, soft-start and pan-detection algorithms in real time. The 28-pin QFN-S exposed-pad package offers good thermal performance for the relatively high PWM switching loss at high current.
Recommended
Uninterruptible Power Supplies (UPS)
In small UPS systems (1 kVA and below), the DSPIC33FJ16GS502T-I/MM performs digital inverter control, battery management and grid/battery transfer switching. The four PWM outputs drive the half-bridge inverter stage with deterministic dead-band insertion, while the dual ADC samples the DC bus, output voltage and current for closed-loop regulation. The on-chip comparators provide hardware overcurrent and short-circuit protection. 16 KB Flash is sufficient for the inverter algorithm plus basic battery charging control with SOC estimation; production designs typically add a redundant supervisor IC for fault cross-checking.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33FJ16GS502T-I/MM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33FJ16GS504-I/MM | DSPIC33FJ06GS502-I/MM | DSPIC33FJ16GS502-I/MM | DSPIC33FJ16GS502T-E/MM |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin QFN-S (6x6) with EP | 28-pin QFN-S (6x6) - same | 28-pin QFN-S (6x6) - same | 28-pin QFN-S (6x6) - same | 28-pin QFN-S (6x6) - same |
| Program Memory (Flash) | 16 KB | 32 KB | 6 KB | 16 KB | 16 KB |
| RAM | 2 KB | 4 KB | 1 KB | 2 KB | 2 KB |
| CPU Speed | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS | 40 MIPS |
| 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, -I) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended, -E) |
| PWM Channels | Up to 4 | Up to 4 | Up to 4 | Up to 4 | Up to 4 |
| ADC | Dual 10-bit SAR, up to 13 channels | Dual 10-bit SAR, up to 13 channels | Dual 10-bit SAR, up to 13 channels | Dual 10-bit SAR, up to 13 channels | Dual 10-bit SAR, up to 13 channels |
| Comparators | 3 on-chip | 3 on-chip | 3 on-chip | 3 on-chip | 3 on-chip |
Key Differentiators
- On-chip high-speed analog comparators with hardware cycle-by-cycle current limit (vs DSPIC33FJ06GS502-I/MM)
- Pin-compatible memory upgrade within the same 28-pin QFN-S footprint (vs DSPIC33FJ16GS504-I/MM)
- Extended-temperature variant available in the same 28-pin QFN-S footprint (vs DSPIC33FJ16GS502T-E/MM)
- 40 MIPS DSP-enhanced core with single-cycle MAC and barrel shifter (vs Generic 16-bit MCU without DSP engine)
Design Notes
Place the 10 uF bulk and 0.1 uF ceramic decoupling capacitors within 2 mm of the VDD, AVDD and VCAP pins. The VCAP pin requires a low-ESR 1 uF to 10 uF ceramic to ground for the internal voltage regulator; failure to include this capacitor causes erratic operation or programming failure. Keep analog VDD/AVDD and digital VDD separated by a ferrite bead or filter, joining the two grounds only at the exposed pad to minimize switching-noise coupling into ADC inputs.
The 28-pin QFN-S exposed pad (EP) is the primary thermal path. Solder the EP directly to a copper pour on the top layer with multiple thermal vias to the inner/ground plane to achieve the published theta_JA of approximately 30 C/W on a 4-layer JEDEC EIA/JESD51 test board. Without proper EP soldering, junction temperature can rise 30-50 percent above expected values during sustained PWM switching at full CPU utilization, leading to thermal shutdown or accelerated silicon wear.
Keep analog input traces (AN0 - ANx, comparator inputs) as short as possible and surrounded by a continuous analog ground pour. Place the current-sense shunt resistors adjacent to the low-side MOSFETs and route the sense traces differentially to AN0/AN1. Avoid routing PWM outputs (PWM1L/PWM1H/PWM2L/PWM2H) under the device or near analog inputs; use a 4-layer PCB with a dedicated ground plane to minimize switching-noise coupling into the ADC.
Common pitfalls when using the DSPIC33FJ16GS502T-I/MM include: (1) omitting the VCAP capacitor causes programming and runtime failures; (2) the MCLR pin requires a 10 kohm pull-up to VDD - leaving it floating prevents the device from starting; (3) the on-chip comparators share analog inputs with the ADC - configure the comparator input select bits carefully to avoid contention; (4) the high-speed PWM outputs do not include internal dead-band for the complementary channel pair - software dead-band insertion in PTPER and DTCON registers is mandatory to prevent shoot-through on a half-bridge; (5) the -I suffix is industrial -40 to +85 C, not automotive - confirm with Microchip's automotive ordering code table before designing an AEC-Q100 system around this part.
Place the external crystal or oscillator within 5 mm of the OSC1/OSC2 pins and guard the traces with a ground ring to reduce EMI susceptibility. JTAG/ICD pins TMS/TCK/PGD/PGC require pull-ups to VDD (typically 4.7 kohm) for reliable in-circuit programming in-circuit. If unused PWM outputs are not connected, configure them as GPIO inputs with the internal weak pull-up enabled to minimize power consumption and unintended switching noise.
Compliance Information
RoHS-compliant per Microchip product page. Industrial temperature grade (-I, -40 to +85 C); the -I suffix is NOT AEC-Q100 qualified - confirm with Microchip's automotive ordering code table before AEC-Q100 designs.