74LS121 / 74121 IC Monostable Multivibrator with Schmitt Trigger Inputs DIP IC (LS TTL Logic, 5V)

The 74LS121 (equivalent to 74121) is a monostable multivibrator integrated circuit designed to generate a single output pulse of controlled duration when triggered. It features Schmitt trigger inputs that provide excellent noise immunity and reliable switching with slow-changing or noisy input signals.

The pulse width is determined by external resistor and capacitor components, making the IC suitable for accurate timing and pulse generation applications. Operating with standard 5V LS TTL logic levels, the 74LS121 is widely used in timing circuits, delay generators, pulse shaping, and digital control systems. Its DIP package is ideal for breadboard prototyping and PCB-based electronic designs.

Key Features -

• Monostable multivibrator for single pulse generation

• Schmitt trigger inputs for improved noise immunity

• Adjustable pulse width using external resistor and capacitor

• Reliable triggering with stable switching performance

• Standard LS TTL compatible logic levels

• Suitable for timing, delay, and pulse generation circuits

• DIP package for easy breadboard and PCB mounting

Specifications -

• IC Model: 74LS121

• Equivalent IC: 74121

• Logic Type: Monostable Multivibrator

• Input Type: Schmitt Trigger Inputs

• Logic Family: LS TTL

• Pulse Width Control: External Resistor and Capacitor

• Package Type: DIP

• Operating Voltage: 4.75V to 5.25V

Applications -

• Pulse generation circuits

• Timing and delay circuits

• Pulse stretching applications

• One-shot timer circuits

• Digital control systems

• Signal conditioning circuits

• Breadboard prototyping

• PCB-based digital electronics