SN74LS123DR

Overview

The SN74LS123DR 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 28 ns at 5 V, and output currents of -400 µA (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
• Low-power Schottky (LS) logic technology for optimized performance
• Surface-mount SOIC-16 packaging for automated assembly

Applications

• Timing and delay generation circuits
• Pulse width modulation signal conditioning
• Debouncing mechanical switches or relays

Procurement Notes

Verify the specific suffix against official manufacturer documentation to confirm pinout compatibility and RoHS status. Confirm that the 16-SOIC package dimensions match the target PCB footprint requirements. Ensure the 74LS logic family specifications align with the system's power and speed constraints before finalizing procurement.

Selection Notes

Select this component when dual independent timing channels are required within a low-power TTL-compatible environment. The LS series offers a balance between speed and power consumption suitable for general-purpose digital applications. Verify that the external RC timing components can achieve the desired pulse width within the specified operating temperature range.

Part Context

This part belongs to the standard 74LS123 family of monostable multivibrators. It serves as a surface-mount variant of the through-hole SN74LS123DE4. The 'DR' suffix indicates tape-and-reel packaging, distinguishing it from tube-packaged versions like the 'D' suffix. It maintains functional equivalence with other 74LS123 derivatives while optimizing for high-volume manufacturing processes.

Replacement Considerations

SN74LS123DRE4 is listed as a manufacturer-recommended alternative.