SN74LS123D

Overview

The SN74LS123D is a dual monostable multivibrator from the Texas Instruments 74LS logic series, housed in a 16-pin SOIC surface-mount package. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to +70°C. Key electrical parameters include a maximum static current of 12 mA, a minimum pulse width of 40 ns, and a maximum propagation delay of 56 ns at 5 V with specified load conditions. The device provides a low-level output current capability of 8 mA and a high-level output current of -0.4 mA.

Feature Summary

• Contains two independent retriggerable monostable multivibrator circuits for precise timing control.
• Features internally generated reset pulses to simplify external circuitry requirements.
• Supports both positive and negative trigger inputs for flexible signal interfacing.

Applications

• Timing delays and pulse stretching
• Debouncing switches
• Frequency division

Procurement Notes

Verify the specific suffix against official documentation to confirm packaging type and environmental compliance. Confirm RoHS status and moisture sensitivity level prior to procurement. Ensure the supplier source matches the manufacturer's authorized distribution channels to guarantee component authenticity and traceability.

Selection Notes

Select this component when dual monostable functionality is required within standard 5V TTL logic systems. Consider the 16-pin SOIC package for surface-mount assembly constraints. Evaluate the 74LS series characteristics regarding power consumption and speed relative to system requirements before finalizing the design choice.

Part Context

This part belongs to the SN54/74(LS)122/23/30 family, which includes various monostable multivibrators. The SN74LS123D specifically offers dual channels in a narrow SOIC footprint, distinguishing it from single-channel variants or through-hole packages within the broader logic IC portfolio.

Replacement Considerations

SN74LS123DR is listed as a manufacturer-recommended alternative with identical functional specifications but differs in reel packaging configuration.