Texas Instruments UCC27531DR

Overview

UCC27531DR from Texas Instruments is a single-channel, high-speed MOSFET/IGBT gate driver with split outputs (OUTH/OUTL), 2.5-A source / 5-A sink peak drive current at 18-V VDD, 17-ns typical propagation delay, and rail-to-rail output swing - designed for high-efficiency switching in DC-DC converters and motor control inverters.

For engineers reviewing the UCC27531DR datasheet, UCC27531DR pinout, UCC27531DR application, or UCC27531DR equivalent, key selection criteria include asymmetric drive capability, –5-V input tolerance, UVLO with 8.9-V turn-on threshold, and SOIC-8 package compatibility for thermal and layout robustness in high-power gate-drive circuits.

Technical Context

The UCC27531DR implements a dual-output architecture where OUTH delivers 2.5-A source current and OUTL sinks up to 5-A, enabling independent optimization of turn-on and turn-off slew rates via external resistors. Its TTL/CMOS-compatible input threshold is supply-independent, and enable functionality allows system-level shutdown with fixed 1.9-V logic-high threshold.

Internal undervoltage lockout holds outputs low until VDD exceeds 8.9 V (typical), and the device sustains –5-V DC on IN/EN pins relative to GND - critical for noise immunity in high-dV/dt power stages. Propagation delay remains stable across –40°C to 140°C junction temperature.

Key Specifications

Pinout & Package

UCC27531DR is supplied in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), offering enhanced thermal performance (R_θJA = 129.9°C/W) and PCB layout flexibility versus SOT-23 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gate driver applications.

Compared with UCC27531DBV, UCC27531DR offers superior thermal performance and noise immunity due to SOIC-8 layout; compared with UCC27538DR, it simplifies control interface with single IN pin but lacks dual-input flexibility for advanced topology support.

Availability

UCC27531DR is available at Aetrix Electronics and suitable for switched-mode power supplies, motor control inverters, and renewable energy power conversion requiring stable component supply and long-term industrial lifecycle support.

Supply support for UCC27531DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in industrial and automotive electronics.

The UCC2753x family was engineered specifically for high-reliability, high-frequency gate driving of silicon and wide-bandgap power devices - targeting efficiency-critical applications like EV chargers, solar inverters, and industrial motor drives.

FAQ

What is the maximum supply voltage rating for UCC27531DR?

The UCC27531DR has an absolute maximum VDD rating of 35 V, with recommended operating range from 10 V to 32 V. Operation beyond 32 V risks exceeding safe electrical stress limits and may trigger internal protection mechanisms or cause permanent damage. Always verify VDD rail stability and transient margins before deployment in 36-V nominal systems.

Does UCC27531DR support both high-side and low-side gate driving configurations?

Yes, UCC27531DR supports both high-side and low-side gate driving when used with proper biasing and signal isolation - such as bootstrap capacitors for high-side or dedicated isolated supplies. Its rail-to-rail output swing, –5-V input tolerance, and 5-A sink capability make it especially effective for low-side IGBT/MOSFET drive and bootstrap-based high-side operation in half-bridge topologies.

How does the UVLO function behave on UCC27531DR during power-up?

UCC27531DR features undervoltage lockout with 8.9-V turn-on threshold and 8.2-V turn-off threshold (0.7-V hysteresis). During power-up, the output remains forced low until VDD rises above 8.9 V; once active, it stays enabled down to 8.2 V. This prevents partial or erratic gate drive during brown-out conditions and ensures clean startup sequencing in UCC27531DR-based power stages.

Can UCC27531DR drive SiC MOSFETs effectively?

Yes, UCC27531DR is well-suited for driving SiC MOSFETs due to its 5-A sink current, 15-ns rise / 7-ns fall times (1.8 nF load), and 17-ns propagation delay - all critical for minimizing switching losses in >100-kHz SiC applications. Its 32-V max VDD accommodates common SiC gate drive requirements, and –5-V input tolerance handles negative transients common in fast-switching layouts.

What is the purpose of the NC pins on the UCC27531DR SOIC-8 package?

The UCC27531DR SOIC-8 package has four NC (no connection) pins (1, 4, 5, and 8) that are electrically and physically isolated from internal circuitry. These pins must remain unconnected in PCB layout - neither tied to GND nor left floating - to avoid parasitic coupling or mechanical stress. TI specifies this configuration to optimize thermal and EMI performance while maintaining pin compatibility with legacy footprints.