L9856-LF

Overview

The L9856 is a high-voltage pre-driver manufactured using BCD "OFF-LINE" technology, designed to drive N-Channel Power MOS transistors. It features a floating upper section capable of operating with voltage rails up to 160V. The device includes CMOS/TTL compatible logic inputs for easy interfacing and provides a driver current capability of 500mA source and 500mA sink. Key electrical parameters include switching times of 100ns rise/fall with a 2.5nF load and dV/dt immunity of ±50V/nsec across the full temperature range.

Feature Summary

• High voltage rail operation up to 160V for driving power MOSFETs
• Robust dV/dt immunity of ±50V/nsec in full temperature range
• CMOS/TTL Schmitt trigger inputs with hysteresis for noise immunity
• Integrated under voltage lock out and clamping on VCC

Applications

• Driving N-Channel Power MOS transistors in high-side configurations
• Automotive load control systems requiring high voltage tolerance
• Industrial motor control interfaces

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm package type and temperature grade. Ensure the ordering part number matches the required pin configuration and material compliance standards. Cross-reference the datasheet revision date to confirm feature availability and electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when a high-side driver with 160V rail capability is required. The 500mA peak current output supports direct driving of power MOSFETs without additional buffering. Consider the SO-8 package constraints for thermal management and PCB layout. Verify input logic compatibility with the controlling microcontroller or interface circuit.

Part Context

The L9856 belongs to STMicroelectronics' portfolio of high-voltage interface and driver ICs. It utilizes BCD technology to integrate high-voltage capabilities with standard logic control functions. This series addresses applications requiring robust gate driving for power switches in automotive and industrial environments where high voltage isolation and noise immunity are critical.

Replacement Considerations

Consult official STMicroelectronics substitution guides for verified alternatives. Generic replacements may not match the 160V rating or specific dV/dt immunity characteristics. Ensure any substitute maintains the SO-8 package footprint and CMOS/TTL input compatibility if board space and logic levels must remain unchanged.

FAQ

What is the maximum voltage rail supported by the L9856?

The L9856 supports a voltage rail up to 160V for its floating upper section.

Does the L9856 have built-in protection features?

Yes, it includes under voltage lock out, clamping on VCC, and reset circuitry.

What is the dV/dt immunity specification?

The device offers dV/dt immunity of ±50V/nsec across the full temperature range.