LM319AM/NOPB

Overview

The LM319AM/NOPB is a high-speed dual voltage comparator manufactured by Texas Instruments. It features a typical response time of less than 200 ns, with specific variants like the LM319N/NOPB achieving 80 ns under standard test conditions. The device operates on a single supply voltage ranging from 5 V to 36 V or dual supplies from ±2.5 V to ±18 V. It utilizes an open-collector output configuration capable of driving loads directly. Key electrical parameters include a maximum input bias current of 1 µA and a maximum input offset voltage of 8 mV. The component is housed in a 14-pin SOIC package and supports commercial operating temperatures from 0°C to +70°C.

Feature Summary

• High-speed switching capability with response times significantly shorter than traditional operational amplifiers.
• Open-collector output design allows for flexible interfacing with various logic families including TTL, DTL, and RTL.
• Wide single-supply voltage range enables direct integration into diverse power systems without complex level shifting.
• Robust input stage tolerates high differential input voltages, enhancing reliability in noisy environments.

Applications

• Fast analog-to-digital converter (ADC) pre-driver circuits requiring rapid signal threshold detection.
• Industrial automation sensor interfaces for immediate over-voltage or under-voltage alarm triggering.
• Waveform generation and shaping applications where precise timing transitions are critical.
• Level detection systems in consumer electronics for monitoring battery status or signal integrity.

Procurement Notes

Verify the specific suffix against the manufacturer's latest datasheet to ensure compatibility with required packaging and temperature grades. Confirm that the open-collector output requirements align with the downstream logic circuitry pull-up resistor values. Ensure the selected variant meets the specific response time specifications needed for the target application speed. Cross-reference the pinout diagram with the PCB footprint to prevent installation errors during assembly.

Selection Notes

Select this component when system latency requirements exceed the capabilities of general-purpose operational amplifiers used as comparators. Consider the open-collector output topology if multiple comparators need to be wired-OR connected or if interfacing with different voltage logic domains. Evaluate the 8 mV maximum input offset voltage against the minimum signal amplitude to ensure accurate threshold detection without significant error margins in precision applications.

Part Context

The LM319 series belongs to Texas Instruments' portfolio of dedicated voltage comparators, distinct from their operational amplifier lines. Unlike op-amps optimized for linear feedback stability, these devices are engineered for saturation-mode operation and minimal propagation delay. The AM/NOPB designation indicates a specific package and lead-free compliance variant within the broader LM319 family, which includes quad and window comparator configurations for expanded system integration options.

Replacement Considerations

Direct functional substitutes within the same high-speed comparator category include the LM319MX/NOPB and LM319N/NOPB, which share identical electrical characteristics but differ in package type such as SOIC or MDIP. Verify pin compatibility before substitution, as package variations may alter physical mounting requirements while maintaining electrical equivalence.