SNJ54HC21FK

Inverter Gates Overview

The SNJ54HC21FK is a military-grade dual 4-input AND gate in the HC CMOS logic family, housed in a 20-lead LCCC package. It operates within a supply voltage range of 2 V to 6 V and supports an extended temperature range from -55°C to +125°C. The device features buffered inputs and balanced push-pull outputs capable of driving up to 10 LSTTL loads while maintaining significant power reduction compared to LSTTL logic ICs.

Inverter Gates Feature Summary

• Contains two independent 4-input AND gates performing Boolean function Y = A • B • C • D
• Balanced CMOS push-pull outputs allow similar sourcing and sinking currents
• Standard CMOS inputs with high impedance characteristics
• Integrated positive and negative clamping diodes on all inputs and outputs

Inverter Gates Applications

• Combining power good signals
• Enabling digital signals
• Directly controlling motor controller reset pins via combined input signals

Inverter Gates Procurement Notes

Verify the specific ordering suffix FK corresponds to the 20-lead LCCC package configuration. Confirm the military grade designation (SN prefix) aligns with required environmental specifications for -55°C to +125°C operation. Check current production status as some variants may be marked NRND or obsolete in distributor databases.

Inverter Gates Selection Notes

Select this component when military-grade reliability and wide temperature tolerance are required for 4-input AND logic functions. Ensure the design accommodates the 20-lead LCCC footprint and accounts for standard CMOS input requirements regarding unused pin termination to prevent floating states.

Inverter Gates Part Context

This part belongs to the SNx4HC21 series of dual 4-input AND gates manufactured by Texas Instruments. It shares functional compatibility with commercial variants like the SN74HC21 but differs in packaging, operating temperature range, and manufacturing standards associated with the military-grade SN prefix.

Inverter Gates Replacement Considerations

Public confirmed substitute part numbers include SNJ54HC21J (CDIP package) and 5962-88576012A (military grade equivalent). Verify package compatibility and thermal management requirements when substituting between LCCC and CDIP formats.