SN74LS221NG4

Overview

The SN74LS221NG4 is a dual non-retriggerable one-shot monostable multivibrator from the Texas Instruments 74LS series. It operates within a supply voltage range of 4.75 V to 5.25 V and features a propagation delay of 45 ns. The device provides complementary outputs with high-level output currents of 400 µA and low-level output currents of 8 mA. Designed for through-hole mounting, it utilizes a 16-pin DIP package and functions reliably across an operating temperature range of 0°C to 70°C.

Feature Summary

• Dual independent non-retriggerable monostable circuits
• Complementary output configuration
• Integrated clear function

Applications

• Timing pulse generation
• Frequency division
• Waveform shaping

Procurement Notes

Verify that the 'G4' suffix indicates compliance with RoHS 3 standards and absence of halogenated flame retardants. Confirm the manufacturer is Texas Instruments and the package type matches the required 16-DIP form factor. Ensure the component status is active or available as a direct replacement if sourcing from secondary markets.

Selection Notes

Select this component when a TTL-compatible dual monostable circuit is required for timing applications. It serves as a direct pin-to-pin replacement for other 74LS221 variants. Consider the 45 ns propagation delay and standard 74LS drive capabilities when designing interface logic.

Part Context

This part belongs to the SN54/74LS221 family of dual non-retriggerable one-shots. It shares functional characteristics with other 74LS series devices but is distinguished by its specific monostable operation mode and complementary output structure. The G4 suffix denotes environmental compliance within the broader product line.

Replacement Considerations

SN74LS221N is a confirmed direct substitute offering identical functionality and pinout compatibility.