LM293N

Overview

The LM293N is a dual low voltage comparator from STMicroelectronics, housed in an 8-pin DIP plastic package. It operates from a single supply of +2V to +36V or split supplies of ±1V to ±18V. The device features very low supply current of 0.4mA at +5V and includes two independent comparators with inputs that include ground. Electrical characteristics specify a typical input offset voltage of ±1mV, input bias current of 25nA, and response time of 1.3µs. Outputs are compatible with TTL, DTL, ECL, MOS, and CMOS logic families.

Feature Summary

• Dual independent comparators designed for wide single-supply or split power operation
• Input common-mode voltage range includes ground potential
• Outputs compatible with various digital logic families including TTL and CMOS
• Very low supply current consumption independent of supply voltage

Applications

• Basic voltage comparison circuits
• Driving TTL logic interfaces
• Low frequency operational amplifier configurations
• Zero crossing detectors using single power supplies
• Transducer amplification stages

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the DIP-8 plastic package configuration as defined in the manufacturer's documentation. Confirm the temperature range aligns with project requirements, noting that the standard LM293 variant typically covers -40°C to +105°C. Ensure compatibility with the intended PCB footprint for through-hole mounting. Cross-reference the datasheet revision date to confirm electrical specifications match the production batch.

Selection Notes

Select this component when a dual comparator with ground-referenced inputs is required for single-supply applications. The DIP-8 package facilitates prototyping and through-hole assembly. Consider the low supply current for battery-powered systems. Evaluate the output saturation voltage and sink current capabilities against load requirements. Verify that the differential input voltage range matches the maximum expected signal levels without exceeding absolute maximum ratings.

Part Context

The LM293 belongs to the LM193/LM293/LM393 family of low power dual voltage comparators manufactured by STMicroelectronics. This series is engineered for cost-effective signal conditioning and threshold detection. The 'N' suffix specifically denotes the standard 8-pin dual in-line package (DIP) construction. These devices serve as general-purpose analog components for converting analog signals into digital outputs within mixed-signal electronic designs.

Replacement Considerations

LM393N: Pin-compatible alternative with potentially different temperature grade specifications.

FAQ

Does the input common-mode voltage range include ground?

Yes, the input common-mode voltage range includes ground even when operated from a single power supply voltage.

What is the typical input offset voltage for the LM293?

The typical input offset voltage is ±1mV at +25°C.

Is the output short-circuit protected?

The device can withstand infinite short-circuits from the output to ground, but shorting to VCC+ can cause excessive heating.