DSPIC33EP128GS702T-I/SO - 16-bit 70 MIPS DSC | Microchip
MPN: DSPIC33EP128GS702T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.35 | $5.35 |
| 10 | $4.82 | $48.20 |
| 100 | $4.36 | $436.00 |
| 500 | $3.94 | $1,970.00 |
| 1,000 | $3.55 | $3,550.00 |
DSPIC33EP128GS702T-I/SO Overview
A digital signal controller combines the compute throughput of a digital signal processor (DSP) with the peripheral set and ease of use of a microcontroller (MCU). Within the power-management hierarchy, the DSC sits between a general-purpose MCU and a dedicated DSP, providing deterministic execution of control loops for switch-mode power supplies.
Key features include a high-speed PWM module with complementary outputs, dead-time insertion and fault inputs; a high-speed 10-bit or 12-bit ADC capable of sampling in synchronization with the PWM; on-chip comparators and an operational amplifier / programmable gain amplifier (PGA) that reduce external analog component count; and Functional Safety (FuSa) documentation support.
Architecturally, the dsPIC33E core uses an enhanced Harvard architecture with a 16-bit data path, DSP multiply-accumulate instructions, and two address-generation units, allowing single-cycle MAC operations essential for digital control-loop mathematics such as PI and 3P3Z compensators.
Typical applications include AC-DC and DC-DC power supplies, power factor correction (PFC) stages, LED drivers, battery chargers, solar micro-inverters, and uninterruptible power supplies (UPS).
Design consideration: dedicate the high-speed PWM dead-time and fault-protection registers early in firmware development, because secondary-side shoot-through protection depends on correct fault configuration, not just PWM duty calculation.
This page synthesizes distributor pricing, drop-in alternatives, and practical digital-power design notes not found in the manufacturer datasheet.
Drop-in alternatives for DSPIC33EP128GS702T-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP128GS702-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33EP128GS702-I/2N
✅ Drop-In📋 Reference alternative (not in catalog)
DSPIC33EP128GS704T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP64GS702T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP32GS702T-I/SO
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128GS702T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 16-bit dsPIC33E enhanced Harvard |
| Maximum Performance | 70 MIPS |
| Program Memory (Flash) | 128 KB (43K x 24) |
| RAM | 8 KB |
| Family | dsPIC33EP GS70x (digital power) |
| Package | 28-SOIC |
| Operating Temperature | -40C to +85C (I grade) |
| Mounting Type | Surface Mount |
| Supply Voltage | 3.0 V to 3.6 V |
| High-Speed PWM | Yes, complementary outputs with dead-time |
| ADC | High-speed ADC with PWM synchronization |
| Comparators | On-chip |
| Programmable Gain Amplifier (PGA) | Yes |
| Functional Safety Support | Yes (FuSa package) |
| Target Applications | SMPS and digital power conversion |
| Packaging | Tape and Reel (T suffix) |
DSPIC33EP128GS702T-I/SO Pin Configuration
| Pin 1 | MCLR — Master clear reset / programming voltage input |
| Pin 2 | AN0/VREF+/CN2/RB0 — Analog input 0 / positive voltage reference |
| Pin 3 | AN1/VREF-/CN3/RB1 — Analog input 1 / negative voltage reference |
| Pin 4 | AN2/SS1/INT0/RB2 — Analog input 2 / SPI slave select / external interrupt 0 |
| Pin 5 | AN3/RB3 — Analog input 3 / digital I/O |
| Pin 6 | AN4/RB4 — Analog input 4 / digital I/O (PWM multiplexed) |
| Pin 7 | VDD — Power supply (3.0 V to 3.6 V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA2 — Crystal oscillator input / external clock input |
| Pin 10 | OSC2/CLKO/RA3 — Crystal oscillator output / clock output |
| Pin 11 | AN5/RB5 — Analog input 5 / digital I/O (PWM/CCP multiplexed) |
| Pin 12 | AN6/RB6 — Analog input 6 / digital I/O (PWM multiplexed) |
| Pin 13 | AN7/RB7 — Analog input 7 / digital I/O (PWM multiplexed) |
| Pin 14 | VSS — Ground reference |
| Pin 15 | VDD — Power supply |
| Pin 16 | PGD/AN8/RB8 — In-circuit debug data / analog input 8 |
| Pin 17 | PGC/AN9/RB9 — In-circuit debug clock / analog input 9 |
| Pin 18 | AN10/RB10 — Analog input 10 / digital I/O (PWM multiplexed) |
| Pin 19 | AN11/RB11 — Analog input 11 / digital I/O (PWM multiplexed) |
| Pin 20 | AN12/RB12 — Analog input 12 / digital I/O (PWM multiplexed) |
| Pin 21 | AN13/T1G/RB13 — Analog input 13 / Timer1 gate / digital I/O |
| Pin 22 | AN14/RB14 — Analog input 14 / digital I/O |
| Pin 23 | AN15/FLTA/RB15 — Analog input 15 / PWM fault input / digital I/O |
| Pin 24 | SCL/RG2 — I2C clock / PPS-mapped peripheral pin |
| Pin 25 | SDA/RG3 — I2C data / PPS-mapped peripheral pin |
| Pin 26 | TX/RP (U1TX) — UART transmit / PPS-mapped peripheral pin |
| Pin 27 | RX/RP (U1RX) — UART receive / PPS-mapped peripheral pin |
| Pin 28 | AVDD/AVSS (Analog Power) — Analog supply/ground pair (multiplexed analog power pins per family datasheet) |
Typical Applications
DSPIC33EP128GS702T-I/SO is suitable for 6 applications: AC-DC Power Supplies, Power Factor Correction (PFC), DC-DC Converters and Point-of-Load Rails, LED Drivers, Battery Chargers, Solar Micro-Inverters and UPS.
AC-DC Power Supplies
The DSPIC33EP128GS702T-I/SO fits AC-DC power supplies because its high-speed PWM module generates complementary outputs with programmable dead-time and cycle-by-cycle current limiting via fault inputs, while the PWM-synchronized ADC samples primary current and output voltage at deterministic instants, eliminating control jitter that degrades regulation. The on-chip comparators and PGA let the controller implement peak current-mode control without external op-amps, reducing BOM cost. In a typical flyback or LLC topology, the 70 MIPS core executes PI or 3P3Z compensation loops at hundreds of kilohertz, achieving fast transient response and tight output regulation that analog-only controllers cannot match with adaptive features such as burst mode.
Recommended
Power Factor Correction (PFC)
For PFC stages in front-end power supplies, the DSPIC33EP128GS702T-I/SO provides the interleaved PWM capability, fast ADC, and analog comparators needed to average-current-mode control a boost converter tracking the rectified line waveform. The 70 MIPS core computes the current-loop compensation each switching cycle, while the on-chip PGA amplifies shunt signals directly, saving external circuitry. Per the Microchip GS70x/80x datasheet, the family explicitly targets multi-loop digital SMPS including PFC, so firmware can close an inner current loop at the switching frequency and an outer voltage loop at line frequency, achieving power factors above 0.99 with full digital programmability of limits and protection thresholds.
Recommended
DC-DC Converters and Point-of-Load Rails
In telecom and server DC-DC bricks and point-of-load converters, the DSPIC33EP128GS702T-I/SO closes voltage-mode or current-mode loops with its complementary high-speed PWM and synchronized sampling. The deterministic 16-bit DSP core executes control mathematics with single-cycle MAC instructions, allowing loop bandwidths limited by the power stage rather than the controller. Its 3.0 V to 3.6 V supply, industrial -40C to +85C rating, and compact 28-SOIC footprint suit dense power boards. Digital implementation also enables telemetry (fault counts, temperature, duty limits) over SMBus/UART, which analog PWM controllers cannot offer without additional supervision ICs, improving system-level power health monitoring.
Recommended
LED Drivers
Digital LED drivers benefit from the DSPIC33EP128GS702T-I/SO because its high-resolution PWM supports both constant-current regulation and dimming control (PWM, analog, or hybrid) from one chip. The ADC monitors LED current via a shunt amplified by the on-chip PGA, and the comparators provide cycle-by-cycle overcurrent protection critical for LED string fault conditions such as short or open circuits. The 70 MIPS core can additionally run communication protocols (DALI-like UART stacks or DMX receivers) while maintaining the switching loop. The 28-SOIC package fits standard LED driver PCBs, and flash programmability lets one hardware platform serve multiple output-current and dimming-curve product variants.
Recommended
Battery Chargers
Multi-chemistry battery chargers use the DSPIC33EP128GS702T-I/SO to implement CC/CV charging profiles, taper detection, and safety timers entirely in firmware. The PWM-synchronized ADC samples charge current and pack voltage with deterministic timing, while the comparators and fault inputs provide hardware-level overcurrent cutoff independent of firmware latency - a layered protection approach required for Li-ion safety. The 70 MIPS core has ample headroom to run temperature-based charge derating (JEITA-style curves), coulomb-counting, and a UART or I2C host interface simultaneously. The industrial temperature grade and 28-SOIC footprint suit chargers embedded in industrial equipment, e-bike systems, and standby battery modules.
Recommended
Solar Micro-Inverters and UPS
Grid-tied micro-inverters and online UPS systems demand simultaneous MPPT, DC-link regulation, and inverter current-loop control - workloads matched to the DSPIC33EP128GS702T-I/SO architecture. Its interconnected high-speed PWM generates multiple phase-shifted or complementary gate signals for boost and H-bridge stages, while the synchronized ADC samples PV voltage/current, DC-link voltage, and grid current in one deterministic frame. The DSP MAC engine executes 3P3Z or PR (proportional-resonant) compensators for low-THD grid-current injection, and hardware comparators implement instantaneous anti-islanding and overcurrent shutdown. Flash density of 128 KB accommodates grid-code tables and a monitoring interface in a single 28-SOIC device.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128GS702T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP128GS702-I/SO | DSPIC33EP128GS702-I/2N | DSPIC33EP128GS704T-I/SO | DSPIC33EP64GS702T-I/SO | DSPIC33EP32GS702T-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Performance | 70 MIPS, 16-bit | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Flash Memory | 128 KB (43K x 24) | 128 KB | 128 KB | Larger than 128 KB (GS704 density) | 64 KB | 32 KB |
| Digital Power Peripherals | HS PWM, sync ADC, comparators, PGA | Identical | Identical | Identical | Identical | Identical |
| Packaging Format | Tape & Reel (T suffix) | Tube | Tube | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- Full 128 KB flash in the cost-optimized 28-SOIC digital-power package (vs DSPIC33EP64GS702T-I/SO)
- Balanced flash/RAM density versus the entry variant (vs DSPIC33EP32GS702T-I/SO)
- Digital-power-specific peripheral set (vs DSPIC33EP128GP502-H/SO)
Design Notes
Decouple each VDD pin (pins 7 and 15) with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one bulk 4.7 uF to 10 uF capacitor near the device. Keep AVDD/analog supply filtered through an RC (for example 10 ohm + 1 uF) from the digital rail so PWM switching noise does not corrupt ADC reference accuracy. The 28-SOIC has no exposed pad, so ground return quality depends entirely on a solid VSS plane - connect both VSS pins (8 and 14) directly with short, wide traces.
The GS70x family multiplexes high-speed PWM outputs onto port pins via Peripheral Pin Select (PPS). A frequent startup failure is an incorrectly mapped PWM pin that defaults to GPIO, leaving the power stage gates floating - always verify PPS registers against the family datasheet output mapping table before first power-up of a live power stage. Additionally, configure the PWM fault input (FLTA) and dead-time registers before enabling outputs; enabling outputs with zero dead-time on a half-bridge causes shoot-through and immediate MOSFET failure.
Route the ADC sense traces (current-shunt and output-voltage feedback) differentially and away from PWM gate-drive traces to minimize switching transients coupling into the synchronized sampler. Trigger the ADC at the midpoint of the PWM off-time where ripple current is minimal - this is a register setting (sampling occurs at the PWM trigger point) rather than a layout matter, but layout must preserve signal integrity for the sampled value to be meaningful. Place comparator inputs (C1INx) close to the shunt for cycle-by-cycle protection accuracy.
Compliance Information
RoHS/lead-free status per standard Microchip commercial offering; confirm via Microchip product page environmental data. Not automotive qualified (no AEC-Q100 claim in provided data).
