SN74LS123DE4

Overview

The SN74LS123DE4 is a dual retriggerable monostable multivibrator from the Texas Instruments 74LS logic series. It operates within a supply voltage range of 4.75 V to 5.25 V and features a maximum static current of 12 mA. The device provides two independent circuits in a 16-pin SOIC package. Key electrical parameters include a minimum pulse width of 40 ns, a propagation delay of 56 ns at 5 V with specified load capacitance, and output currents of -0.4 mA (high) and 8 mA (low). It functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Standard 74LS logic family compatibility
• Surface-mount SOIC-16 packaging

Applications

• Timing and delay generation circuits
• Pulse width modulation applications
• Frequency division circuits
• Waveform shaping and pulse stretching

Procurement Notes

Verify the specific suffix 'E4' indicates RoHS compliance and lead-free manufacturing status as per Texas Instruments documentation. Confirm the package type matches the required PCB footprint, as variants exist in different packages such as DBR or DR. Ensure the ordering information aligns with the intended volume and reel specifications for surface mount assembly processes.

Selection Notes

Select this component when dual independent timing channels are required within a single package. The 74LS series offers standard TTL-compatible inputs suitable for legacy digital systems. Consider the retriggerable feature if input pulses may arrive before the output pulse has terminated. Verify that the 5V supply rail and current drive capabilities meet the downstream load requirements.

Part Context

This part belongs to the SN54/74(LS)122/23/30 family of monostable multivibrators. The 'DE4' designation specifically identifies the Texas Instruments manufactured version in a 16-SOIC narrow package with environmental compliance markings. It serves as a direct functional replacement for other 74LS123 variants within the same logic family, maintaining pinout and electrical compatibility.

Replacement Considerations

SN74LS123DR is a manufacturer-recommended alternative available in tape-and-reel packaging. SN74LS123DRE4 is another compliant variant. Cross-reference datasheets to ensure identical pin configurations and electrical characteristics before substitution.