LM339M/NOPB

Overview

The LM339M/NOPB is a quad analog comparator manufactured by Texas Instruments, housed in a 14-pin SOIC surface-mount package. It operates on a single supply voltage ranging from 2V to 36V or dual supplies of ±1V to ±18V. The device features four independent differential comparators with an open-collector output configuration. Key electrical specifications include a maximum input offset voltage of 5mV and an input bias current of 250nA. The typical response time is 1.3µs, and the quiescent supply current per channel is approximately 500µA. It supports a maximum output sink current of 16mA at 5V and functions within a temperature range of 0°C to 70°C.

Feature Summary

• Integrates four independent high-gain differential comparators for multi-channel signal processing.
• Features an open-collector output stage compatible with various logic families and pull-up voltages.
• Operates effectively across a wide single-supply voltage range without requiring negative rails.
• Provides low power consumption suitable for battery-powered and portable applications.

Applications

• Temperature sensing circuits using thermistors or RTDs
• Over-voltage and under-voltage protection systems
• Window comparator designs for voltage monitoring
• Logic level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as defined by Texas Instruments. Confirm the SOIC-14 package dimensions match the target PCB footprint. Ensure the operating temperature range meets the environmental requirements of the final assembly. Cross-reference the datasheet revision to confirm pinout consistency with existing designs.

Selection Notes

Select this component when multiple independent comparison functions are required in a compact surface-mount form factor. It is suitable for designs needing wide supply voltage flexibility and open-collector outputs. Consider alternative packages like PDIP if through-hole mounting is mandatory. Evaluate thermal dissipation capabilities if multiple channels operate simultaneously near maximum ratings.

Part Context

This part belongs to the LM339 family of quad comparators, a long-standing industry standard for general-purpose analog comparison tasks. The 'M' suffix denotes the SOIC-14 surface-mount package variant. The 'NOPB' designation typically signifies a lead-free and RoHS-compliant version of the original component, aligning with modern environmental regulations while maintaining functional equivalence to earlier iterations.

Replacement Considerations

• LM339DRG4
• LM339MX-NOPB

FAQ

What is the output configuration of the LM339M/NOPB?

The outputs are open-collector type, requiring an external pull-up resistor to the desired voltage rail for proper operation.

Can the LM339M/NOPB handle negative input signals?

Yes, the common-mode input voltage range extends to -0.3V, allowing it to process signals slightly below ground potential.