SN74121N

Overview

The SN74121N is a non-retriggerable monostable multivibrator manufactured by Texas Instruments. It operates within a DC supply voltage range of 4.75V to 5.25V and supports an output current of 16 mA. The device features two channels, utilizes a 14-pin PDIP package with through-hole mounting, and functions across an operating temperature range of 0°C to 70°C.

Feature Summary

• Generates precise timing pulses using external resistor and capacitor components
• Provides dual independent monostable circuits for flexible signal conditioning
• Ensures reliable operation through standard TTL logic compatibility

Applications

• Timing pulse generation in digital systems
• Frequency division circuits
• Pulse width modulation applications

Procurement Notes

Verify the specific manufacturer datasheet version before integration, as specifications may evolve. Confirm that the PDIP-14 through-hole package aligns with your PCB footprint requirements. Ensure the 4.75V to 5.25V supply voltage range matches your system design constraints. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when a non-retriggerable monostable function is required within standard TTL voltage limits. The PDIP-14 package suits prototyping or low-volume through-hole designs. Consider alternative packages like SOIC if surface mount technology is preferred for production scaling. Verify thermal performance meets your enclosure's ambient temperature conditions.

Part Context

This part belongs to the Texas Instruments SN74xx series of logic integrated circuits. It serves as a fundamental building block for creating timed events in digital electronics. The device replaces older discrete transistor-based timing solutions with a compact, standardized IC format suitable for various industrial and consumer electronic applications.

Replacement Considerations

SN74LS121N

FAQ

Is the SN74121N retriggerable?

No, the SN74121N is a non-retriggerable monostable multivibrator. New trigger signals applied during the output pulse duration are ignored until the cycle completes.

What determines the output pulse width?

The output pulse width is determined by the values of the external resistor and capacitor connected to the device's timing pins.