SN74LS123NSR

Overview

The SN74LS123NSR is a dual retriggerable monostable multivibrator from the Texas Instruments SN74LS 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 NS (SOIC-Narrow) package, suitable for surface-mount applications. Key electrical characteristics include a propagation delay of 56 ns at 5 V with specified load capacitance, a minimum pulse width of 40 ns, and output drive capabilities 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
• Wide input trigger compatibility via Schmitt-trigger inputs
• Complementary outputs available for flexible circuit interfacing

Applications

• Timing delays
• Pulse width generation
• Frequency division
• Debouncing switches

Procurement Notes

Verify the specific suffix 'NSR' against the manufacturer's official documentation to confirm the exact package type and tape-and-reel configuration. Ensure that the ordering information matches the required lead times and environmental compliance standards such as RoHS. Cross-reference the datasheet revision history to validate any recent changes to pinout or electrical specifications before finalizing procurement orders.

Selection Notes

Select this component when a dual-channel solution with retriggering capability is required for timing applications. The LS logic family offers standard TTL-compatible voltage levels. Consider the package constraints and thermal requirements relative to the application environment. Verify that the external RC components selected can achieve the desired pulse width within the specified tolerance limits defined in the official datasheet.

Part Context

The SN74LS123 belongs to the widely used 74LS logic family, known for low-power Schottky performance. This specific part integrates two monostable multivibrators, allowing for compact designs requiring multiple timing functions. It serves as a functional alternative to older discrete implementations, providing reliable pulse generation in digital systems where precise timing control is essential.

Replacement Considerations

Compatible substitutes include SN74LS123DRE4 and SN74LS123DRG4 from Texas Instruments, which share identical logical functionality but may differ in packaging or environmental certifications.