LM119H

Overview

The LM119H is a high-speed dual comparator manufactured by Texas Instruments. It features two independent comparators designed for operation from a single +5V logic supply or wider voltage ranges up to ±15V. The device utilizes an open-collector output capable of driving loads such as relays with up to 25mA current. Key electrical specifications include a typical response time of 80ns at ±15V supplies, a maximum input bias current of 1µA across the full operating temperature range, and a minimum fan-out of 2 per side. It operates within a supply voltage range of +5V to ±15V.

Feature Summary

• Dual independent comparator architecture optimized for high-speed signal comparison
• Open-collector output stage supporting direct interfacing with transistor-transistor logic (TTL) systems
• Capable of driving external loads including lamps and relays with significant current capacity
• Designed for stable operation across wide power supply voltage variations

Applications

• Digital logic power supply monitoring and control circuits
• High-speed pulse generation and timing applications
• Direct drive interfaces for relays and indicator lamps
• Systems requiring isolation between input signals and system ground

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and environmental rating. Ensure the component matches the required pinout for the TO-100 metal can package. Confirm that the open-collector output configuration aligns with the pull-up requirements of the target circuit design before finalizing procurement.

Selection Notes

Select this component when application requirements demand fast response times around 80ns combined with the ability to interface directly with TTL logic levels. Consider its suitability for designs needing to drive moderate current loads like relays without additional buffering. Evaluate the trade-off between its higher power consumption relative to older models against its superior speed and broader operational voltage flexibility.

Part Context

The LM119H belongs to the LMx19 family of high-speed dual comparators produced by Texas Instruments. This series was engineered to provide faster response characteristics compared to predecessors like the LM111, while maintaining compatibility with standard logic families. The H suffix typically denotes a specific military-grade or high-reliability variant housed in a metal can package, distinguishing it from plastic packaged commercial versions.

Replacement Considerations

• LM319H/NOPB
• LM319H

FAQ

What is the typical response time of the LM119H?

The typical response time is 80ns when powered by ±15V supplies.

Can the LM119H drive relays directly?

Yes, the open-collector output can drive relays with currents up to 25mA.

What is the maximum input bias current specification?

The maximum input bias current is 1µA across the entire operating temperature range.