LM393N/NOPB

Overview

The LM393N/NOPB is a dual low-power voltage comparator manufactured by Texas Instruments, housed in an 8-pin DIP package. It operates on a single supply voltage ranging from 2V to 36V or dual supplies of ±1V to ±18V. The device features two independent high-precision comparators with a typical static current of 0.4mA and a maximum of 1mA. Key electrical specifications include a response time of approximately 1.3µs, an input bias current of 25nA, and an output short-circuit current capability of 16mA at 5V. The input common-mode voltage range includes ground, allowing for direct sensing near the negative rail.

Feature Summary

• Dual-channel architecture providing two independent precision voltage comparison functions within a single integrated circuit.
• Open-collector output structure requiring external pull-up resistors, enabling compatibility with various logic families including TTL and CMOS.
• Wide single-supply operating range supporting voltages from 2V up to 36V for flexible power system integration.
• Low quiescent current consumption ensuring minimal power drain during operation.

Applications

• Voltage level detection and monitoring circuits
• Zero-crossing detection for AC signal processing
• Sensor signal conditioning and threshold triggering
• Square wave generation and timing applications

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the package type corresponds to the standard 8-pin Dual In-line Package (DIP) variant rather than surface-mount alternatives like SOIC or TSSOP. Ensure the ordering part number matches the exact pinout and electrical characteristics required for the target design to avoid functional mismatches.

Selection Notes

Select this component when a dual comparator with open-collector outputs is required for general-purpose analog switching. It is suitable for designs needing wide supply voltage flexibility and low power consumption. Consider alternative packages such as SOIC if space constraints preclude through-hole mounting. Verify that the application does not require rail-to-rail output swing, as the open-collector design necessitates external pull-ups for high-state voltage levels.

Part Context

This device belongs to the LM393 family of dual comparators, widely used in industrial and consumer electronics for basic analog-to-digital interface tasks. The NOPB suffix typically denotes a lead-free version compliant with environmental directives. It serves as a cost-effective solution for applications where high-speed performance is not critical but reliability and low power are priorities.

Replacement Considerations

Compatible substitutes include the LM393M/NOPB for surface-mount applications and generic equivalents like the MC3393. Verify pin compatibility and electrical parameter tolerances before substitution to ensure circuit functionality remains intact.