LM319D

Overview

The LM319D is a dual high-speed precision voltage comparator manufactured by STMicroelectronics. It features two independent comparators with open-collector outputs, enabling compatibility with TTL logic and the ability to drive loads such as lamps or relays up to 25 mA. The device operates over a wide supply voltage range from +5 V to ±15 V. Key electrical specifications include a typical response time of 80 ns at ±15 V, a maximum input current of 1 μA across the operating temperature range, and a minimum fan-out of two per output side.

Feature Summary

• Dual independent high-speed comparators designed for precision applications
• Open-collector output stage compatible with transistor-transistor logic (TTL)
• Capable of driving lamps and relays with currents up to 25 mA
• Inputs and outputs can be isolated from system ground

Applications

• Digital logic interface circuits requiring fast signal comparison
• Driving high-current loads such as relays and indicator lamps
• Systems requiring isolation between inputs/outputs and system ground
• Precision voltage monitoring in mixed-signal environments

Procurement Notes

Verify that the specific part number corresponds to the dual-channel variant rather than single or quad configurations within the broader comparator family. Confirm package type and pinout alignment with design schematics, as variations exist across similar STMicroelectronics devices. Ensure supply voltage requirements match the +5 V to ±15 V operational range specified for this component. Cross-reference thermal performance data if driving high-current loads near the 25 mA limit.

Selection Notes

Select this component when high-speed response times around 80 ns are required compared to slower general-purpose comparators. Choose this part over the LM111 if lower propagation delay is prioritized over minimal current consumption. Consider the open-collector output capability for interfacing directly with TTL logic levels without additional pull-up components. Evaluate the wider supply voltage flexibility compared to fixed-voltage logic comparators for versatile power supply designs.

Part Context

The LM319 belongs to the LM119/LM219/LM319 family of dual high-speed comparators. These devices share architectural similarities but differ in temperature ranges and manufacturing grades. The LM319 specifically targets commercial temperature ranges while maintaining the high-speed characteristics defined by the series. It serves as a faster alternative to the LM111, trading higher current consumption for improved response times and versatility in digital logic applications.

Replacement Considerations

Public confirmed substitute part numbers: LM119, LM219.