UCC21551AQDWKRQ1

Overview

The UCC21551AQDWKRQ1 is an automotive-grade, dual-channel optically isolated gate driver from Texas Instruments. It features a 4A peak source and 6A peak sink output current capability, supporting power MOSFETs, SiC, and IGBT devices. The device provides 5000 VRMS reinforced isolation and operates within a junction temperature range of -40°C to +150°C. Key electrical parameters include a maximum propagation delay of 45 ns, rise/fall times of 8 ns, and a maximum power dissipation of 950 mW. It utilizes a 14-SOIC package and accepts supply voltages between 6.5V and 25V for the driver section.

Feature Summary

• Provides robust 5000 VRMS reinforced optical isolation for high-voltage noise immunity in automotive environments.
• Delivers asymmetric drive strength with 4A source and 6A sink currents to efficiently switch wide-bandgap semiconductors.
• Integrates dedicated Enable (EN) and Dead Time (DT) pins for precise control and protection in half-bridge configurations.

Applications

• Automotive traction inverters and on-board chargers utilizing SiC or IGBT modules
• High-density DC-DC converters requiring galvanic isolation
• Industrial motor drives and servo amplifiers

Procurement Notes

Verify the AEC-Q100 Grade 1 qualification status and ensure the SOIC-14 package variant matches the specific PCB footprint requirements. Confirm that the moisture sensitivity level and reflow soldering profiles align with assembly line capabilities. Cross-reference the suffix 'RQ1' to guarantee compliance with automotive reliability standards and long-term availability commitments.

Selection Notes

Select this component when high voltage isolation and fast switching speeds are critical for automotive power electronics. The asymmetric current drive optimizes switching losses for SiC devices. Ensure the application circuit supports the required supply voltage range and thermal management for the specified power dissipation limits in enclosed automotive enclosures.

Part Context

This part belongs to the UCC21551-Q1 family of isolated gate drivers designed for demanding automotive applications. It complements lower-isolation variants like the UCC21550 by offering enhanced 5kVRMS insulation. The series targets efficiency improvements in electric vehicle powertrains through reduced parasitic effects and improved signal integrity across the isolation barrier.

Replacement Considerations

Direct substitutes include other UCC21551-Q1 variants with different packaging or tape-and-reel options. Verify compatibility with UCC21550 if lower isolation voltage is acceptable. Check for pin-compatible alternatives from other manufacturers only if they match the exact electrical specifications and automotive qualification standards.

FAQ

What is the maximum operating junction temperature for this device?

The UCC21551AQDWKRQ1 is rated for a maximum operating junction temperature of +150°C.

Does this driver support both low-side and high-side configurations?

Yes, the dual-channel architecture allows for universal configuration as dual low-side, dual high-side, or half-bridge drivers.