L6494LD

Overview

The L6494LD is a high-voltage half-bridge gate driver manufactured using BCD6 OFF-LINE technology, designed for driving N-channel power MOSFETs or IGBTs. It features a floating high-side section capable of withstanding a voltage rail up to 500 V and a transient withstand voltage of 600 V. The device provides independent high-side and low-side outputs, each sourcing 2 A and sinking 2.5 A. Logic inputs are compatible with 3.3 V, 5 V TTL/CMOS standards. Key electrical characteristics include a propagation delay of 85 ns, switching times of 25 ns rise/fall with a 1 nF load, and dV/dt immunity of ±50 V/ns across the full temperature range.

Feature Summary

• Integrated bootstrap diode simplifies PCB layout and reduces bill of materials
• Independent UVLO protection circuits on both high-side and low-side sections prevent operation in unsafe conditions
• Single input configuration with programmable deadtime and active-low shutdown pin
• High dV/dt immunity ensures reliable performance under fast switching transients

Applications

• Medium and high capacity power MOSFET gate driving
• IGBT gate driving in industrial applications
• Half-bridge converter topologies requiring high voltage isolation
• Offline power supply designs utilizing BCD technology

Procurement Notes

Verify the specific suffix 'LD' against the manufacturer's official datasheet to confirm package type and tape/reel specifications. Ensure design compatibility with the required operating voltage range and logic input levels. Cross-reference the component marking code with the latest production documentation to avoid counterfeit parts. Confirm that the intended application does not exceed the specified transient withstand voltage limits.

Selection Notes

Select this component when a single-chip solution for half-bridge applications is required with integrated bootstrap functionality. It is suitable for designs needing CMOS/TTL interface compatibility down to 3.3 V. Consider this driver for medium-to-high capacity switches where compact layout and reduced external component count are priorities. Verify that the thermal requirements align with the SOIC-14 package capabilities.

Part Context

The L6494LD belongs to the L649x series of high-voltage gate drivers from STMicroelectronics. These devices utilize BCD6 OFF-LINE technology to integrate high-voltage components with standard logic interfaces. The series is designed to simplify the design of offline power converters and motor drives by combining gate driving, protection, and bootstrap functions into a single package.

Replacement Considerations

The L6498LD is a related variant within the same family offering similar high-voltage half-bridge capabilities. Verify pinout compatibility and specific current sourcing/sinking ratings before substitution. Consult the official replacement guide for any functional differences between the LD suffix variants.