54LS122/SCA

Overview

The 54LS122/SCA is a monostable multivibrator manufactured by Rochester Electronics, LLC. It belongs to the LS series of TTL logic circuits and features dual marking as M38510/31403SCA. The device is housed in a ceramic DIP-14 package with glass-sealed construction. Key electrical parameters include a propagation delay of 15 ns and a maximum supply voltage of 5.5 V. It operates within a temperature range of -55 °C to 125 °C.

Feature Summary

• Monostable multivibrator functionality for pulse generation
• Ceramic DIP-14 package with glass-sealed construction
• LS series TTL logic compatibility
• Extended industrial temperature operation capability

Applications

• Pulse width modulation circuits
• Timing delay applications
• Debounce circuits for switches

Procurement Notes

Verify the dual marking M38510/31403SCA on the component body to confirm authenticity. Ensure the ceramic DIP-14 package matches the required form factor. Check for signs of physical damage or seal integrity issues given the glass-sealed construction. Confirm the manufacturer is Rochester Electronics, LLC, as this part may be sourced from surplus or recycled channels rather than new production lines.

Selection Notes

Select this component when a robust, hermetically sealed monostable multivibrator is required for harsh environments. The ceramic package offers superior thermal stability compared to plastic alternatives. Consider the 15 ns propagation delay for timing-sensitive applications. Verify that the LS series input/output characteristics align with the surrounding circuit logic levels.

Part Context

This component is part of the broader 54LSxx family of high-speed low-power Schottky TTL devices. Rochester Electronics specializes in sourcing and qualifying legacy and obsolete components, often providing military-grade equivalents like the M38510 series. The 54LS122 variant specifically provides retriggerable monostable multivibrator functions within this logical family structure.

Replacement Considerations

Direct substitutes include other 54LS122 variants such as 54LS122/BDA, which shares similar functional specifications. Verify pinout compatibility and package dimensions before substitution. Ensure the replacement maintains the same ceramic DIP-14 form factor if environmental sealing is critical.