Texas Instruments UCC27531D

Overview

UCC27531D from Texas Instruments is a single-channel, high-speed MOSFET/IGBT gate driver IC in an 8-pin SOIC package, delivering 2.5-A source and 5-A sink peak output current at 18-V VDD, with 17-ns typical propagation delay and rail-to-rail drive capability-designed for high-efficiency switching in DC-DC converters and solar inverters.

For engineers reviewing the UCC27531D datasheet, UCC27531D pinout, UCC27531D application, or UCC27531D equivalent, this page delivers verified functional identity, SOIC-8 package mapping, split-output timing behavior, UVLO thresholds, and two validated alternative gate drivers for power stage design validation.

Technical Context

The UCC27531D implements asymmetrical drive via dedicated OUTH (source) and OUTL (sink) outputs, enabling independent turn-on/turn-off resistor tuning to suppress Miller-induced false triggering. Its TTL/CMOS-compatible input threshold is supply-independent, and enable logic allows system-level shutdown without signal inversion.

Internal undervoltage lockout holds output low until VDD exceeds 8.9 V (typical), and input/enable pins tolerate –5 V DC below ground-critical for robust operation in noisy power-conversion environments with ground bounce or negative transients.

Key Specifications

Pinout & Package

UCC27531D is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with thermal performance characterized by R_θJA = 129.9°C/W under JEDEC-standard board conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27531DBV and UCC27537DBV, the UCC27531D provides superior thermal performance (R_θJA = 129.9°C/W vs. ≥178°C/W) and mechanical stability in automated assembly, making it optimal for industrial and automotive-grade power modules requiring long-term reliability at 140°C junction temperature.

Availability

UCC27531D is available at Aetrix Electronics and suitable for switched-mode power supplies, solar inverters, and EV onboard chargers requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for UCC27531D 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 high-reliability power conversion solutions.

The UCC2753x product line was designed specifically for high-efficiency, high-frequency gate driving in industrial motor control, renewable energy, and electric vehicle power systems - emphasizing robustness, timing precision, and thermal resilience.

FAQ

What is the function of the NC pins on the UCC27531D?

The UCC27531D has four NC (no connection) pins - pins 1, 4, 5, and 8 - which are not bonded to the die and serve no electrical function. They must remain unconnected; tying them to GND or VDD may cause mechanical stress or contamination during assembly. Their presence accommodates package standardization across the UCC2753x family while maintaining SOIC-8 compatibility.

Does the UCC27531D support both high-side and low-side gate driving?

Yes, the UCC27531D supports both high-side and low-side configurations when used with appropriate biasing and isolation. Its rail-to-rail output swing, –5-V input tolerance, and 5-A sink current make it suitable for low-side drive out-of-the-box; for high-side use, it requires bootstrap or isolated supply circuitry - confirmed in TI's UCC27531 application notes and reference designs.

What is the maximum recommended operating frequency for UCC27531D-driven MOSFETs?

The UCC27531D itself has no inherent frequency limit; its 17-ns propagation delay and 15-ns/7-ns rise/fall times support reliable operation up to 5 MHz in optimized layouts. Real-world maximum frequency depends on MOSFET gate charge, external resistor values, and PCB parasitics - TI's test data shows stable 100-kHz to 1-MHz operation with 1.8-nF loads and proper decoupling.

How does the UCC27531D handle floating input conditions?

When the IN pin is left floating, internal circuitry pulls the output low - a fail-safe behavior confirmed in the UCC27531D datasheet Section 5. Leaving IN unconnected ensures the power switch remains off, preventing unintended turn-on during power-up, reset, or controller fault conditions without requiring external pull-down resistors.

Is the UCC27531D pin-compatible with other devices in the UCC2753x family?

No, the UCC27531D is not pin-compatible with UCC27531DBV, UCC27533DBV, or UCC27537DBV due to differing pin counts, functions, and NC placements. The SOIC-8 UCC27531D has four NC pins and a combined OUT pin, whereas SOT-23 variants expose OUTH/OUTL separately or omit EN - direct substitution requires PCB redesign and validation.