LM319N

Overview

The LM319N is a high-speed dual voltage comparator manufactured by Texas Instruments. It features two independent comparators within a single package, designed for operation with a wide supply voltage range from 5 V to 36 V. The device utilizes open-collector outputs, ensuring compatibility with various logic families including RTL, DTL, and TTL. Key electrical specifications include an input bias current of 1000 nA, an input offset voltage of 8 mV, and a typical response time of 80 ns at ±15 V supplies. It operates within a commercial temperature range of 0°C to 70°C and is housed in a 14-pin MDIP package.

Feature Summary

• High-speed performance with typical 80-ns response time
• Wide single-supply voltage operation from 5 V to 36 V
• Open-collector outputs compatible with multiple logic families
• Two independent comparators per package

Applications

• Digital logic interfacing and level shifting
• Threshold detection circuits
• Drive applications for lamps and relays
• Fast analog-to-digital conversion stages

Procurement Notes

Verify the specific suffix 'N' corresponds to the through-hole MDIP package variant rather than surface-mount options. Confirm that the operating temperature range meets the 0°C to 70°C requirement for the intended environment. Ensure the open-collector output configuration aligns with the pull-up resistor requirements of the downstream digital logic circuitry.

Selection Notes

Select this component when high-speed switching is required alongside wide voltage tolerance. The open-collector architecture allows flexible output voltage levels determined by external pull-up resistors. Consider the 80-ns propagation delay as a limiting factor for very high-frequency signal processing compared to faster dedicated comparators.

Part Context

The LM319 belongs to the LMx19 series of precision high-speed dual comparers. It offers higher gain and lower input current compared to older devices like the LM710. While it consumes more power than the LM111, its speed and broad voltage range provide greater versatility for general-purpose comparison tasks in mixed-signal systems.

Replacement Considerations

LM319M/NOPB: Surface-mount SOIC-14 equivalent with identical electrical characteristics.