LF21904NTR

Overview

The LF21904NTR is a half-bridge gate driver IC manufactured by Littelfuse, housed in a 14-SOIC package. It features independent channels with non-inverting input logic and supports IGBT and N-channel MOSFET loads. The device operates within a supply voltage range of 10V to 20V and withstands high-side voltages up to 600V using bootstrap configuration. Peak output currents reach 4.5A for both sourcing and sinking. Typical rise and fall times are 25ns and 20ns respectively. Logic thresholds are defined at 0.8V (VIL) and 2.5V (VIH). The component functions reliably across an operating temperature range of -40°C to 125°C.

Feature Summary

• Provides isolated half-bridge driving capability for high-voltage power switching applications
• Supports direct drive for IGBTs and N-channel MOSFETs with robust peak current output
• Features non-inverting logic inputs compatible with standard digital control interfaces

Applications

• Motor control systems requiring high-side and low-side switching
• Power conversion circuits including inverters and converters
• Industrial drives utilizing IGBT or MOSFET topologies

Procurement Notes

Verify the manufacturer designation as IXYS Integrated Circuits Division or Littelfuse on official documentation, as acquisition history affects part identification. Confirm the specific ordering suffix matches the required tape-and-reel packaging format. Ensure compliance with RoHS3 standards and check moisture sensitivity level classifications before integration into production workflows.

Selection Notes

Select this component when designing circuits requiring a dedicated half-bridge driver with 600V high-side capability. The 14-SOIC package suits surface-mount assembly processes. Evaluate the 4.5A peak drive strength against the target switch's gate charge requirements. Verify that the 10V to 20V supply range aligns with the system's available power rails and logic voltage levels.

Part Context

This device belongs to the LF21904 series of gate drivers designed for power management integrated circuits. It serves as a critical interface between low-power control logic and high-power semiconductor switches. The product line emphasizes reliability in industrial and automotive environments where robust switching performance is essential for efficient energy conversion.

Replacement Considerations

Check for updated Littelfuse or IXYS part numbers if legacy stock is unavailable. Verify pinout compatibility and electrical specifications against alternative half-bridge drivers from other manufacturers before substitution.