SN54HC14J

Overview

The SN54HC14J is a military-grade Hex Schmitt-Trigger Inverter manufactured by Texas Instruments. It contains six independent inverters within a single package, designed for high-noise immunity applications. The device operates over an extended temperature range of -55°C to 125°C and utilizes a 14-pin Ceramic Dual Inline Package (CDIP). Key electrical characteristics include a supply voltage range of 2V to 6V, with maximum output currents of 4mA for both sourcing and sinking. Propagation delay is typically 31ns at 5V, supporting frequencies up to 20MHz.

Feature Summary

• Integrates six independent Schmitt-trigger inverters for signal conditioning
• Provides enhanced noise immunity through defined input hysteresis thresholds
• Constructed in hermetically sealed ceramic dual inline package for reliability
• Operates across the full military temperature range without performance degradation

Applications

• Signal wave shaping from slow-rise or slow-fall edge transitions
• Pulse generation circuits requiring precise timing control
• Oscillator designs utilizing RC feedback networks
• Level shifting between different logic families in harsh environments

Procurement Notes

Verify the specific suffix J indicates the ceramic DIP package variant when sourcing. Confirm that the component meets MIL-STD requirements if military qualification is necessary. Check for RoHS compliance status as older ceramic packages may differ from modern plastic equivalents. Ensure the supplier provides traceability documentation for the manufacturing lot. Validate that the operating environment matches the specified -55°C to 125°C range.

Selection Notes

Select this component when high noise immunity is critical for digital signal integrity. Choose the SN54HC14J over standard inverters if input signals exhibit significant ringing or slow transition times. Consider the CDIP package for applications requiring superior thermal stability and hermetic sealing compared to plastic alternatives. Verify that the 2V to 6V supply range aligns with the system power architecture.

Part Context

This part belongs to the HC/UH series of high-speed CMOS logic devices produced by Texas Instruments. The 'SN' prefix denotes semiconductor product, while '54' indicates military grade specifications. The 'HC' identifies the High-speed CMOS technology family. The 'J' suffix specifically designates the ceramic dual inline package construction, distinguishing it from plastic variants like N or D suffixes.

Replacement Considerations

Direct pin-compatible replacements include SN54HC14N and SN54HC14D for non-military applications. For hermetic requirements, verify availability of SN54HC14W. Cross-reference with SN54LS14J for TTL-level compatibility if voltage levels differ. Ensure substitute parts maintain the same Schmitt-trigger functionality and package dimensions.