dsPIC33EP128GS708-I/PT - 70 MIPS Digital Power DSC | Microchip
MPN: DSPIC33EP128GS708-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.96 | $12.96 |
| 10 | $11.8 | $118.00 |
| 100 | $10.6 | $1,060.00 |
| 500 | $9.6 | $4,800.00 |
| 1,000 | $8.8 | $8,800.00 |
DSPIC33EP128GS708-I/PT Overview
A Digital Signal Controller combines the computational throughput of a DSP with the peripheral integration and deterministic control of a microcontroller, sitting between a general-purpose MCU and a dedicated DSP in the power-management hierarchy. The dsPIC33EP GS family is purpose-built for digital switch-mode power supplies (SMPS) and digital power conversion, where fast control loops such as voltage-mode, current-mode, and multi-loop PFC require deterministic interrupt latency and high-resolution PWM.
Key features include the 70 MIPS dsPIC DSC core with DSP multiply-accumulate instructions, dual 12-bit ADCs with simultaneous sampling for sensing input and output rails, high-speed PWM peripherals with dead-time control and fault protection, and integrated analog comparators for cycle-by-cycle current limiting. These peripherals enable closing of control loops at switching frequencies well above 100 kHz with software or hardware-assisted regulation.
The GS-series architecture is optimized for digital power: the PWM module supports complementary, push-pull, and phase-shifted topologies, while the ADC can be synchronized directly to PWM events to sample currents at the correct instant in each switching cycle. On-chip flash supports self-programming for firmware-updatable power supplies and field firmware updates in deployed products.
Typical applications include AC-DC power supplies, DC-DC converters, power factor correction stages, solar micro-inverters, battery chargers, LED drivers, and uninterrupted power supplies (UPS), where programmability replaces hard-wired analog control for flexibility and smart-grid features.
Design consideration: this is a 3.0V to 3.6V device; do not power it from a 5V rail. Decouple the 3.3V supply with 0.1 uF ceramics at every VDD pin and keep the PWM-to-MOSFET-gate traces short to limit ringing and EMI.
This page adds value beyond the datasheet by consolidating distributor pricing, pin-compatible drop-in family alternatives, comparison tables, and practical digital-power design notes in one place.
Drop-in alternatives for DSPIC33EP128GS708-I/PT — 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 DSPIC33EP128GS708-I/PT (same form factor and footprint) — differing in Package, ADC, Functional Safety Support, Operating Temperature, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DSPIC33EP256GS708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP64GS708-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.95 / Unit
View Datasheet →DSPIC33EP32GS708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128GM708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP256GM708-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DSPIC33EP128GS708-I/PT Maximum Ratings & Electrical Characteristics
| Core Type | 16-bit dsPIC DSC core |
| Performance | 70 MIPS |
| Flash Memory | 128 KB |
| RAM | 8 KB |
| Operating Voltage | 3 V to 3.6 V |
| Operating Temperature | -40C to +85C |
| Package | TQFP-80 (12x12 mm) |
| Mounting Type | Surface Mount |
| Application Focus | SMPS & digital power conversion |
| ADC Resolution | 12-bit |
| Special Peripherals | High-speed PWM, comparators, op-amps |
| Programmable Bootloadable Flash | Yes (self-programming) |
| Instruction Set | DSP enhanced (MAC, modulo addressing) |
| Mounting Package Code | PT |
| Supply Category | Single 3.3 V supply |
| RoHS Status | unknown |
DSPIC33EP128GS708-I/PT pt Pin Configuration Guide
Pin configuration for DSPIC33EP128GS708-I/PT (pt package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for DSPIC33EP128GS708-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
DSPIC33EP128GS708-I/PT is suitable for 6 applications: AC-DC Digital Power Supplies, Power Factor Correction (PFC), DC-DC Converters and Battery Chargers, Solar Micro-Inverters, Uninterruptible Power Supplies (UPS), Industrial LED Drivers and Lighting Power.
AC-DC Digital Power Supplies
The dsPIC33EP128GS708-I/PT is explicitly designed by Microchip for multi-loop digital switch-mode power supplies, including AC-DC front ends. Its high-speed PWM provides complementary outputs with programmable dead time and cycle-by-cycle current limiting via integrated comparators, while the dual 12-bit ADCs synchronized to PWM events sample input voltage and output current at the correct instant in each switching period. Running the 70 MIPS core at switching frequencies above 100 kHz, firmware implements voltage-mode, average current-mode, or peak current-mode control without analog compensation networks, enabling programmable soft-start, adaptive burst mode, and PMBus-style telemetry that discrete analog controllers cannot offer.
Recommended
Power Factor Correction (PFC)
In boost-PFC and bridgeless-PFC stages, the GS708 closes the fast inner current loop and the slower outer voltage loop in firmware. The 70 MIPS DSP core executes the multiply-accumulate-heavy control mathematics with deterministic latency, while the PWM module supports phase-shifted and interleaved topologies needed to reduce input ripple current. The on-chip comparators trip the PWM outputs within the same switching cycle on overcurrent faults, protecting the MOSFETs without software intervention. Because loop shaping, harmonic compensation, and brown-out handling are firmware-defined, one hardware design covers multiple worldwide input-voltage and THD specifications, simplifying platform qualification across product lines.
Recommended
DC-DC Converters and Battery Chargers
Synchronous buck, boost, and full-bridge DC-DC converters, plus multi-chemistry battery chargers, benefit from the GS708's PWM/ADC co-synchronization and self-programmable 128 KB Flash. Charging profiles (CC/CV, taper, termination) and converter characterization live in firmware, so one PCB supports multiple battery chemistries and output voltages with different code images. The dual 12-bit ADCs simultaneously read battery current and voltage for accurate coulomb-style supervision, while fault-comparator outputs remove drive within a single cycle under short-circuit conditions. Field firmware updates through the self-programming flash let manufacturers deploy revised charging algorithms to already-installed units.
Recommended
Solar Micro-Inverters
Micro-inverter control requires MPPT on the panel side plus grid-synchronized current injection on the AC side - two interacting loops that the GS708's 70 MIPS core and PWM/ADC synchronization handle deterministically. The PWM supports the phase-shifted full-bridge and interleaved flyback topologies common in micro-inverters, with cycle-by-cycle current protection via on-chip comparators. Firmware flexibility enables reactive-power support and anti-islanding behavior updates without hardware changes. The -40C to +85C industrial temperature rating of the -I/PT variant suits rooftop enclosures, subject to junction-temperature derating at elevated ambient and switching-loss conditions in the final thermal design.
Recommended
Uninterruptible Power Supplies (UPS)
Online and line-interactive UPS systems use the GS708 to control the rectifier, battery converter, and inverter stages with coordinated firmware state machines. The high-speed PWM's fault protection and the ADC's simultaneous multi-channel sampling maintain output regulation during mode transitions (bypass, battery, charging), while DSP arithmetic throughput supports repetitive-control or PR-control algorithms for low-THD inverter output. Self-programmable Flash permits in-service firmware updates and event logging in the remaining flash space. The 80-pin TQFP provides enough I/O for relay drivers, bypass SCR control, and front-panel or communication interfaces within a single 3.3V controller.
Recommended
Industrial LED Drivers and Lighting Power
High-power LED drivers for industrial and architectural lighting use the GS708 for constant-current regulation with programmable dimming (PWM, analog, or DALI-style protocols in firmware). The PWM module's complementary outputs drive the buck or flyback power stage, the 12-bit ADC samples LED current for accurate regulation, and comparators enforce cycle-by-cycle current limits against LED string shorts. Firmware-defined dimming curves, temperature derating via an external NTC, and failure telemetry differentiate products in a cost-sensitive market. The 3.3V, -40C to +85C rating and single-chip integration reduce BOM count versus discrete analog dimming and protection circuits.
Recommended
Recommended Products Summary
Engineering reference data for DSPIC33EP128GS708-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DSPIC33EP256GS708-I/PT | DSPIC33EP64GS708-I/PT | DSPIC33EP128GM708-I/PT | DSPIC33EP32GS708-I/PT |
|---|---|---|---|---|---|
| Package | TQFP-80 (12x12 mm) | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same | TQFP-80 (12x12 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Performance | 70 MIPS, 16-bit dsPIC DSC | 70 MIPS | 70 MIPS | 70 MIPS | 70 MIPS |
| Flash Memory | 128 KB | 256 KB | 64 KB | 128 KB | 32 KB |
| Operating Voltage | 3 V to 3.6 V | 3 V to 3.6 V | 3 V to 3.6 V | 3 V to 3.6 V | 3 V to 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +85C (I suffix) | -40C to +85C (I suffix) | -40C to +85C (I suffix) | -40C to +85C (I suffix) |
| Family Optimization | SMPS / digital power conversion (GS) | Digital power (GS) | Digital power (GS) | General purpose (GM) | Digital power (GS) |
Key Differentiators
- Digital-power-optimized GS peripherals (vs DSPIC33EP128GM708-I/PT)
- Lowest-risk production alternative with double the code space (vs DSPIC33EP256GS708-I/PT)
- Cost-down option within the same footprint (vs DSPIC33EP32GS708-I/PT)
Design Notes
This is strictly a 3.0V-3.6V device - never connect it directly to a 5V rail. Generate the 3.3V core supply from a low-noise LDO or a well-filtered buck output, because the ADCs sample PWM-synchronized signals where a few LSBs of supply noise become visible current-measurement error. Place 0.1 uF ceramic decoupling at every VDD/AVDD pin pair within 2-3 mm of the pin, plus 4.7-10 uF bulk nearby. Filter AVDD through an RC (e.g. ferrite bead plus 1 uF) from the digital rail for cleaner analog sampling.
In digital power layouts, separate the power-stage switching loops from the controller ground region and connect them at a single star point to prevent high di/dt currents from corrupting ADC ground references. Route PWM outputs to gate drivers as short, guarded traces (fewer than ~25 mm) and place the gate-driver input resistor close to the DSC pin. Bring differential current-sense signals (e.g. shunt amplifier outputs) to the ADC pins as a tight pair over the quiet analog ground region. Reserve an ICSP header on MCLR/PGD/PGC for in-circuit programming and field firmware updates.
Do not exceed the absolute maximum supply of 3.6V and confirm that configuration bits (oscillator source, watchdog, PWM pin mapping) match your clock plan before first power-up - misconfigured FOSC selection is the most common bring-up failure on dsPIC33EP devices. Account for the temperature suffix: the -I grade is -40C to +85C; designs needing higher ambient must select the appropriate extended-temperature ordering option. Finally, when substituting Flash-size variants (32/64/256 KB), verify that your application plus bootloader actually fits the smaller devices before committing a cost-down.
Compliance Information
Compliance statuses were not stated in the verified web data. Modern Microchip dsPIC33EP commercial parts are generally RoHS-compliant, but confirm on the official Microchip product page or certificate of conformance before procurement.
