SN74121DE4

Overview

The SN74121DE4 is a monostable multivibrator manufactured by Texas Instruments, featuring Schmitt-trigger inputs for noise immunity. It operates within a DC supply voltage range of 4.75V to 5.25V and supports an output current of 16 mA. The device contains one channel with two inputs and is housed in a 14-pin SOIC package. It functions reliably across a temperature range of 0°C to 70°C.

Feature Summary

• Monostable multivibrator configuration with Schmitt-trigger inputs
• High noise immunity through input triggering design
• Standard TTL-compatible logic levels

Applications

• Timing pulse generation
• Frequency division circuits
• Waveform shaping applications

Procurement Notes

Verify the specific suffix 'E4' indicates lead-free compliance and RoHS standards when sourcing. Confirm the DE4 designation corresponds to the SOIC-14 surface-mount package variant rather than the PDIP through-hole version. Ensure the component meets the required industrial operating temperature specifications for the intended deployment environment.

Selection Notes

Select this component for designs requiring precise single-shot timing pulses triggered by external signals. The Schmitt-trigger inputs provide necessary noise rejection for digital systems. Verify that the 16 mA output drive capability matches the load requirements of the downstream circuitry without exceeding absolute maximum ratings.

Part Context

This part belongs to the Texas Instruments SN74xx series of digital logic components. The SN74121 specifically addresses monostable multivibrator needs within standard logic families. It serves as a fundamental building block for timing control and signal conditioning tasks in general-purpose electronic equipment.

Replacement Considerations

Compatible substitutes include SN74121D and SN74121DR from Texas Instruments. These variants share identical functional specifications but may differ in packaging or reel configurations.