LM319MX

Overview

The LM319MX is a high-speed dual comparator manufactured by Texas Instruments, housed in a 14-pin SOIC surface-mount package. It features two independent channels with open-collector outputs capable of driving loads up to 25 mA. 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. Typical response time is 80 ns at ±15 V supply with a 50 mV input step. Input bias current is typically 200 nA, with a maximum of 1 μA. The typical input offset voltage is 2 mV, with a maximum of 8 mV. Operating temperature range is 0°C to +70°C.

Feature Summary

• High-speed performance with an 80 ns typical response time for rapid signal comparison.
• Open-collector output design allows direct interfacing with RTL, DTL, and TTL logic families.
• Wide single-supply operation capability from 5 V to 36 V simplifies power system integration.
• Strong drive capability supports direct connection to relays, lamps, and indicators without external buffers.

Applications

• Fast analog-to-digital converter (ADC) interface circuits
• Waveform generation and shaping systems
• Industrial level detection and alarm triggering
• Logic-level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'MX' against the manufacturer's official datasheet to confirm the SOIC-14 narrow package variant. Ensure the order includes the 'NOPB' designation if lead-free compliance is required. Confirm that the open-collector output configuration aligns with the pull-up resistor requirements of the target logic family. Validate the commercial temperature range suitability for the intended operating environment.

Selection Notes

Select this component when high-speed switching is required within standard digital logic voltage levels. The open-collector output necessitates an external pull-up resistor; ensure the selected resistor value supports the desired rise time and logic high voltage. Verify that the 25 mA output current rating exceeds the load requirements. Consider the 8 mV maximum input offset voltage for precision applications requiring accurate threshold detection.

Part Context

The LM319MX belongs to the LM119/LM219/LM319 series of high-speed dual comparators. While functionally similar to the through-hole LM319N, the MX variant utilizes a surface-mount SOIC-14 package. This series is designed for general-purpose applications where fast response times are critical. The device provides two independent comparators on a single chip, offering a compact solution for multi-channel signal processing tasks.

Replacement Considerations

• LM319MX/NOPB
• LM319MXE/NOPB