LM319DT

Overview

The LM319DT is a dual high-speed comparator manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It operates within a supply voltage range of 5V to ±15V (±2.5V to 15V). Key electrical parameters include a typical response time of 80 ns at ±15V, a maximum input bias current of 1 µA at ±15V, and a maximum input offset voltage of 8 mV at ±15V. The device features open collector and open emitter outputs compatible with TTL logic. It supports a maximum sink current of 25 mA and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Dual independent comparators designed for high-speed operation with low input currents and high gain.
• Open collector and open emitter output stages provide compatibility with transistor-transistor logic (TTL) and allow driving loads such as lamps and relays.
• Capable of operating from single or split power supplies, allowing inputs and outputs to be isolated from system ground.

Applications

• Digital logic interface circuits requiring fast signal comparison
• Driving lamps and relays via direct output connection
• High-speed pulse generation and timing applications

Procurement Notes

Verify the specific suffix 'DT' corresponds to the 14-SOIC package and commercial temperature grade when sourcing. Confirm that the required response time of 80 ns aligns with the application's speed requirements, as this device consumes more current than slower alternatives like the LM111. Ensure the design accommodates the open-collector output structure for proper pull-up resistor selection.

Selection Notes

Select the LM319DT when high-speed performance is prioritized over low power consumption. Unlike the LM111, this device offers faster response times but requires higher supply current. It is suitable for designs needing TTL compatibility and the ability to drive moderate loads directly. Consider the LM339 series if lower power consumption is critical and speed requirements are less stringent.

Part Context

The LM319 belongs to the LM119/LM219/LM319 family of precision high-speed dual comparators. These devices are engineered for versatility across wide operating voltage ranges and digital logic supplies. They serve as high-speed alternatives to standard comparators, offering a balance between rapid response and functional flexibility in compact packages.

Replacement Considerations

LM319AM/NOPB is a confirmed substitute part number available from Texas Instruments.