Texas Instruments UCC21732DW

Overview

UCC21732DW from Texas Instruments is a reinforced isolated single-channel gate driver optimized for SiC MOSFETs and IGBTs up to 2121 V_Pk, delivering ±10 A peak source/sink drive strength, 130 ns max propagation delay, and integrated isolated analog sensing with PWM output. It enables high-efficiency motor drives and solar inverters requiring fast overcurrent protection and high CMTI.

For engineers reviewing the UCC21732DW datasheet, UCC21732DW pinout, UCC21732DW application, or UCC21732DW equivalent, key selection criteria include reinforced isolation rating (5.7 kV_RMS, 8000 V_PK), active miller clamp support, dual UVLO (VDD & VCC), and split-output gate drive architecture for precise switching control in high-voltage power stages.

Technical Context

The UCC21732DW implements capacitive SiO₂ isolation with 150 V/ns minimum CMTI and >40-year barrier lifetime, supporting 1.5 kV_RMS working voltage and 12.8 kV_PK surge immunity. Its input-to-output isolation barrier meets DIN EN IEC 60747-17 (VDE 0884-17) reinforced insulation standards.

It integrates dual-stage fault response: 270 ns overcurrent detection followed by internal 2-level turn-off (9–10 V threshold, 500–1000 ns duration) and active miller clamp (1.5–2.5 V threshold). The isolated analog sensing channel supports NTC/PTC/thermal diode temperature monitoring and DC-link voltage sensing via APWM output (360–440 kHz).

Key Specifications

Pinout & Package

UCC21732DW uses a 16-pin SOIC (DW) package with 10.3 mm × 7.5 mm body size, 1.27 mm pitch, and reinforced isolation barrier separating input (GND side) and output (COM side) terminals. Creepage and clearance exceed 8 mm for reinforced insulation compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8273ACD-IS and ADUM4135BRWZ, the UCC21732DW uniquely combines reinforced isolation, ±10 A drive, integrated miller clamp, and isolated analog sensing - enabling compact, high-reliability SiC/IGBT gate drive with fewer external components and simplified thermal management.

Availability

UCC21732DW is available at Aetrix Electronics and suitable for industrial motor drives, solar inverters, uninterruptible power supplies, and server power supplies requiring stable component supply, long-term lifecycle assurance, and reinforced isolation compliance.

Supply support for UCC21732DW 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 90 years of innovation in industrial and automotive electronics.

The UCC21732DW belongs to TI's reinforced isolated gate driver product line, engineered specifically for high-voltage SiC and IGBT power stages in mission-critical industrial energy systems demanding functional safety, high CMTI, and integrated protection.

FAQ

What is the maximum gate drive voltage supported by the UCC21732DW?

The UCC21732DW supports a maximum VDD–VEE differential of 33 V, with VDD ranging from 13 V to 33 V and VEE from –17.5 V to 0.3 V relative to COM. This allows flexible gate bias configurations including +20 V/–5 V for SiC MOSFETs, directly enabling robust turn-on and noise-immune turn-off without external level shifters. The UCC21732DW's internal charge pump and rail-to-rail output stage maintain ±10 A drive capability across this full range.

How does the UCC21732DW implement overcurrent protection?

The UCC21732DW uses a dedicated OC pin with 0.7 V threshold and 120 ns deglitch filter to detect DESAT, shunt, or SenseFET faults. Upon detection, it triggers a 270 ns response to initiate 2-level turn-off: first lowering gate voltage to 9 V for 500–1000 ns, then hard-shutting down. This staged action limits di/dt and voltage overshoot. The UCC21732DW also asserts FLT (open-drain) and blocks further switching until RST/EN is pulsed low for >1000 ns.

Can the UCC21732DW monitor temperature without external components?

Yes. The UCC21732DW integrates an isolated analog sensing channel with AIN input and APWM output. When connected to an NTC thermistor (biased by internal 203 µA current source), the UCC21732DW converts temperature to a 360–440 kHz PWM signal with duty cycle linearly proportional to voltage (7–91%). This eliminates isolated amplifiers and ADCs - the host MCU reads duty cycle via timer capture, enabling direct thermal monitoring of heatsinks or windings using only two passive components.

What is the purpose of the CLMPE pin on the UCC21732DW?

The CLMPE pin on the UCC21732DW drives an external N-channel MOSFET to actively clamp the power device gate during the Miller plateau region, preventing false turn-on caused by high dv/dt. It operates with a fixed 1.5–2.5 V threshold referenced to VEE and delivers up to 0.25 A peak source current. This feature is essential for reliable SiC MOSFET operation in high-frequency, high-power topologies where parasitic coupling dominates. The UCC21732DW's CLMPE eliminates need for discrete clamp circuits and improves system robustness.

Does the UCC21732DW support both inverting and non-inverting logic inputs?

Yes. The UCC21732DW accepts differential logic inputs via IN+ and IN– pins. With IN– tied to GND and IN+ driven, it operates in non-inverting mode; with IN+ tied to VCC and IN– driven, it functions as an inverting driver. Propagation delays are matched (≤30 ns skew) between rising and falling edges, and input hysteresis (0.33 V at 3.3 V VCC) ensures noise immunity. This flexibility allows seamless integration with various controller architectures without external logic inversion, preserving timing integrity in the UCC21732DW-based design.