LM219D

Overview

The LM219D is a dual high-speed comparator manufactured by STMicroelectronics, designed for operation over a wide supply voltage range from single +5 V logic supplies up to ±15 V. It features low input currents and high gains, with an open-collector output stage compatible with TTL logic and capable of driving loads such as lamps and relays at currents up to 25 mA. The device offers faster response times than the LM111, typically 80 ns at ±15 V, while maintaining a minimum fan-out of two on each side. Inputs and outputs can be isolated from system ground, and it supports a maximum input current of 1 μA across the operating temperature range.

Feature Summary

• Dual independent comparators with high common-mode slew rate
• Open-collector output stage compatible with transistor-transistor logic (TTL)
• Wide operating voltage range supporting single or dual power supplies
• Capable of driving lamps and relays at currents up to 25 mA

Applications

• Digital logic supply applications requiring fast response
• Driving lamps and relays via open-collector outputs
• Signal conditioning circuits using window comparator configurations

Procurement Notes

Verify the specific suffix 'D' indicates the SOIC package variant when sourcing. Confirm that the component is marked as active or in production status depending on current inventory availability. Ensure compatibility with required supply voltages ranging from +5 V to ±15 V before integration into designs requiring isolation from system ground.

Selection Notes

Select this component when higher speed is required compared to the LM111, accepting the trade-off of higher current consumption. It is suitable for designs needing versatility through a wide operating voltage range and simple packaging. Consider the open-collector output capability if direct driving of TTL logic or moderate current loads like relays is necessary without additional buffering stages.

Part Context

The LM219D belongs to the LM119/LM219/LM319 family of precision high-speed dual comparators. These devices are engineered primarily for digital logic supply operations but are fully specified for power supplies up to ±15 V. They offer a balance of speed, voltage range, and package simplicity, making them more versatile alternatives to slower predecessors like the LM111 in various signal processing tasks.

Replacement Considerations

The LM119 and LM319 are confirmed substitutes within the same functional family. Verify pinout compatibility and ensure the replacement meets the specific voltage and current requirements of the original design.