SN54LS221J

Overview

The SN54LS221J is a dual monostable multivibrator from the Texas Instruments SN54LS series, housed in a CDIP-16 ceramic package. It operates within a supply voltage range of 5V and supports an extended temperature range of -55°C to 125°C. The device features two independent circuits with Schmitt-trigger inputs for noise immunity. Key electrical parameters include a propagation delay of 30 ns and a pulse width capability up to 1 ms.

Feature Summary

• Dual independent monostable multivibrator circuits
• Schmitt-trigger inputs for improved noise rejection
• Ceramic DIP packaging for high reliability

Applications

• Timing generation in military systems
• Pulse shaping in aerospace electronics
• Frequency division in harsh environments

Procurement Notes

Verify manufacturer traceability and lot codes due to multiple production sources including Texas Instruments and NXP. Confirm RoHS compliance status as legacy parts may vary by manufacturing date. Ensure the CDIP-16 ceramic package matches design requirements for thermal and mechanical stability.

Selection Notes

Select this component when extended temperature operation (-55°C to 125°C) is required. The SN54LS221J is suitable for designs needing Schmitt-trigger inputs to handle slow or noisy signals. Compare against SN74LS221 variants if commercial temperature ranges suffice.

Part Context

Part of the SN54LS family designed for military and aerospace applications. The 'J' suffix indicates a ceramic dual in-line package. It provides robust performance in high-radiation or extreme temperature conditions compared to plastic-packaged equivalents.

Replacement Considerations

SN54LS221JC: Ceramic DIP variant with potentially different speed grades. SN54LS221FK: Flatpack version for surface mount needs. Verify pinout compatibility before substitution.