SN74121DR

Overview

The SN74121DR 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 surface-mount package. It functions as a single-bit logic gate with a standard voltage wave crest of 5.00 V.

Feature Summary

• Monostable multivibrator configuration with Schmitt-trigger inputs
• Surface-mount packaging for automated assembly
• Standard TTL-compatible logic operation

Applications

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

Procurement Notes

Verify the specific suffix 'DR' indicates the tape-and-reel surface-mount variant distinct from through-hole packages. Confirm RoHS compliance status and lead-free certification against the latest manufacturer datasheet prior to integration. Ensure the ordering information matches the required package type and environmental standards for the target production run.

Selection Notes

Select this component when a reliable monostable timing solution with Schmitt-trigger input noise immunity is required in a surface-mount design. Consider the 16 mA output drive capability and 5V operating voltage constraints. Verify that the single-channel architecture meets the circuit's timing requirements without necessitating additional components.

Part Context

This part belongs to the SN7412x series of monostable multivibrators produced by Texas Instruments. The 'D' prefix typically denotes a SOIC package, while 'R' specifies reel packaging. It is part of the broader standard logic family designed for general-purpose digital timing applications in industrial and consumer electronics.

Replacement Considerations

Public confirmed substitute part numbers include SN74121N, SN74121D, SN74121DE4, and SN74121DR.