UCC5881-Q1 - 20A Isolated SiC/IGBT Gate Driver | Texas Instruments
MPN: UCC5881-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $8.1 | $810.00 |
| 500 | $7.25 | $3,625.00 |
| 1,000 | $6.5 | $6,500.00 |
UCC5881-Q1 Overview
An isolated gate driver is a power-semiconductor interface IC that combines galvanic isolation with high-current gate drive capability, allowing a low-voltage controller to safely command a high-voltage power switch. Isolated gate drivers sit hierarchically between gate drivers and isolated power modules; in EV traction inverters they bridge the 12 V domain MCU and the 400 V or 800 V DC bus, enabling functional-safety-compliant drive of SiC MOSFETs and IGBTs at MHz-class switching frequencies.
Key features include 14 selectable DESAT leading-edge blanking settings, 5 DESAT deglitch filter settings, and 16 DESAT threshold settings for configurable short-circuit protection. The device also integrates shunt-resistor-based over-current detection, over-temperature sensing (PTC, NTC, or diode), two-level soft turn-off during faults, an integrated 10-bit ADC, and ASIL-compliant diagnostics. Compared with the predecessor UCC5880-Q1, the UCC5881-Q1 adds more DESAT configurability and an INT_COMM fault filter while remaining pin-to-pin compatible.
Technically, the UCC5881-Q1 uses TI's proprietary capacitive-isolation technology to deliver 5000 Vrms reinforced isolation. The 20 A adjustable drive strength reduces switching losses by up to 80 percent versus fixed-strength drivers, and the integrated ADC enables closed-loop temperature and current telemetry directly to the MCU.
Typical applications include 400 V and 800 V EV traction inverters, onboard chargers, DC fast-charging stations, solar string inverters, and industrial motor drives. The configurable fault handling suits ASIL-D functional-safety designs.
When designing with this device, ensure the gate-drive loop is minimized and the DESAT blanking time is tuned for the chosen SiC MOSFET's blanking requirements. The SPI interface must be isolated from the secondary high-voltage domain with a digital isolator.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering information for EV powertrain and renewable-energy power-conversion designers.
Drop-in alternatives for UCC5881-Q1 — 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:
UCC5880QDFCRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC5871QDFCRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC5881-Q1 Maximum Ratings & Electrical Characteristics
| Driver Type | Isolated gate driver, single channel |
| Isolation Type | Capacitive coupling |
| Isolation Voltage Rating | 5000 Vrms |
| Maximum Drive Current | 20 A |
| Configured Switch Type | IGBT, SiC MOSFET |
| Number of Channels | 1 |
| Integrated ADC | 10-bit |
| Communication Interface | SPI (programmable) |
| Short-Circuit Protection | DESAT with 16 thresholds, 5 deglitch settings, 14 leading-edge blanking settings |
| Over-Current Protection | Shunt-resistor based |
| Over-Temperature Protection | PTC, NTC, or diode sensing |
| Fault Turn-Off | Soft turn-off or two-level soft turn-off, selectable |
| Automotive Qualification | AEC-Q100 qualified |
| Functional Safety | ASIL-compliant diagnostics |
| Package | 32-SSOP (DFC) with thermal pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
UCC5881-Q1 32-ssop (dfc) with thermal pad Pin Configuration Guide
Pin configuration for UCC5881-Q1 (32-ssop (dfc) with thermal pad package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for UCC5881-Q1.
Refer to the datasheet for full pin configuration.
Typical Applications
UCC5881-Q1 is suitable for 6 applications: 800 V EV Traction Inverter, Onboard Battery Charger (OBC), DC Fast Charging Station, Solar String Inverter, Industrial Servo Drive, Energy Storage System (ESS) Bidirectional DC-DC.
800 V EV Traction Inverter
The UCC5881-Q1 is designed as the gate driver for SiC MOSFET power modules in 800 V EV traction inverters. Its 5000 Vrms capacitive isolation handles the 800 V DC-link with margin, while the 20 A adjustable drive strength reduces switching loss by up to 80 percent versus fixed-strength drivers at high dV/dt. Placed between the 12 V domain MCU and the SiC module gate, it provides ASIL-D-compliant DESAT protection with 16 configurable thresholds and two-level soft turn-off. Unlike opto-isolated drivers, the capacitive isolation supports 1 MHz switching frequencies typical of modern SiC traction stages.
Recommended
Onboard Battery Charger (OBC)
The UCC5881-Q1 drives the primary-side SiC MOSFETs in 22 kW EV onboard chargers operating from 400 V or 800 V battery packs. Its 10-bit integrated ADC enables closed-loop monitoring of drain current and module temperature, simplifying ASIL-B functional-safety implementations. The SPI programmability lets designers tune the gate current profile for each OBC operating mode (CC, CV, PFC), reducing EMI filter cost. Placed in a totem-pole PFC or DCDC stage, the UCC5881-Q1 supports hard-switching SiC at 100 kHz to 500 kHz without thermal derating.
Recommended
DC Fast Charging Station
The UCC5881-Q1 is suited for 350 kW DC fast-charging stations where IGBT or SiC stacks convert 800 V grid-tied DC to vehicle battery voltage. Its shunt-resistor over-current detection and PTC/NTC over-temperature inputs feed the integrated 10-bit ADC, providing redundant fault channels required for ASIL-D power-conversion systems. Two-level soft turn-off protects modules from short-circuit avalanche stress. Placed per phase-leg, the UCC5881-Q1 enables parallel-module operation with synchronized fault response, a key requirement for high-power charger stacks.
Recommended
Solar String Inverter
In 1500 V PV string inverters the UCC5881-Q1 drives IGBT modules at high dV/dt with reinforced 5000 Vrms isolation, comfortably exceeding the 1500 Vpk bus-to-ground requirement. The SPI-programmable DESAT thresholds can be retuned in firmware to support different IGBT generations, simplifying BOM consolidation across product variants. Placed on each half-bridge the gate driver delivers 20 A peak current enabling MHz-class switching that shrinks magnetics. Its AEC-Q100 grade adds reliability margin in outdoor cabinets where temperature swings are extreme.
Recommended
Industrial Servo Drive
Industrial servo drives use the UCC5881-Q1 to drive 600 V to 1200 V IGBT modules in three-phase inverter stages powering servo motors. The DESAT-based short-circuit protection with selectable blanking time matches a wide range of IGBT modules from multiple vendors, simplifying multi-CSK sourcing. Its 10-bit ADC back-channels motor phase current and DC-link voltage telemetry directly to the MCU, reducing external sensor count. Placed in a three-phase bridge the UCC5881-Q1 supports hard-switching at 20 kHz without thermal limitations, enabling compact servo packaging.
Recommended
Energy Storage System (ESS) Bidirectional DC-DC
Bidirectional DC-DC converters in grid-tied battery energy storage systems use the UCC5881-Q1 to drive SiC MOSFET half-bridges connecting 800 V battery racks to 1500 V DC links. The integrated ADC and ASIL-compliant diagnostics support ASIL-D-grade ESS systems required by IEC 61508 and UL 9540A. Two-level soft turn-off prevents avalanche failure during short-circuit events, protecting expensive SiC modules. Placed on the high-voltage side of the DC-DC, the UCC5881-Q1 enables bidirectional power flow with high efficiency at 100 kHz switching frequencies.
Recommended
Recommended Products Summary
Engineering reference data for UCC5881-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC5880QDFCRQ1 | UCC5871QDFCRQ1 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 32-SSOP (DFC) | 32-SSOP (DFC) - same | 32-SSOP (DFC) - same |
| Maximum Drive Current | 20 A | 20 A | 20 A |
| Integrated ADC | 10-bit | 10-bit | 10-bit (half the channels) |
| INT_COMM Fault Filter | Yes | No | No |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 |
Key Differentiators
- More DESAT configurability than predecessor (vs UCC5880QDFCRQ1)
- INT_COMM fault filter for SPI communication diagnostics (vs UCC5880QDFCRQ1)
- Doubled ADC channel count vs UCC5871-Q1 (vs UCC5871QDFCRQ1)
Design Notes
The UCC5881-Q1 gate-drive loop (OUTH/OUTL to gate-emitter of SiC module, returning to GND2) must be minimized to below 5 nH to avoid ringing and partial-turn-on of SiC MOSFETs at 100+ V/ns dV/dt. Use a Kelvin connection between the driver GND2 and the SiC module source, with a 4-layer PCB and a dedicated gate-drive return plane directly beneath the driver. Place the 1 uF VCC2 bypass capacitor within 2 mm of the driver VCC2 pin and add a 100 nF HF bypass in parallel.
The DESAT leading-edge blanking time must be tuned for the specific SiC MOSFET or IGBT used. Too short, and the protection false-triggers on the Miller plateau turn-on spike; too long, and a real short circuit is not detected quickly enough to protect the module. The UCC5881-Q1's 14 selectable blanking settings via SPI enable per-module tuning. Always verify the DESAT threshold against worst-case short-circuit desaturation voltage at maximum Tj.
Estimated: at 50 kHz switching frequency with 20 A peak gate current and 50 percent utilization, the UCC5881-Q1's internal gate-driver stage dissipates roughly 0.5 W to 0.8 W. With a 32-SSOP thermal pad soldered to a 1 square inch 2 oz copper pour, theta_JA is approximately 35 C/W, resulting in a 28 C rise above ambient. For continuous full-current operation in sealed enclosures, augment with thermal vias and a bottom-side copper spreader to keep Tj below 125 C.
Isolate the SPI bus from the high-voltage domain using a reinforced digital isolator such as ISO7741. The UCC5881-Q1's SPI pins (SDI, SDO, SCLK, nCS, nFLT) are referenced to the primary low-voltage domain; routing them across the isolation barrier must use a 4 mm minimum clearance to meet IEC 60664-1 reinforced isolation creepage. Place the SPI isolator on the same primary-side PCB region as the MCU, and keep the secondary-side traces short to minimize antenna loops for radiated EMI.
Compliance Information
AEC-Q100 qualified automotive grade. RoHS and REACH compliant per TI product page. Halogen-free status not explicitly stated.
