SN74HC20NSR

Inverter Gates Overview

The SN74HC20NSR is a dual 4-input NAND gate manufactured by Texas Instruments in the HC logic family. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40°C to +85°C. The device features buffered inputs, balanced CMOS push-pull outputs, and clamp diode structures on all pins. It provides significant power reduction compared to LSTTL logic ICs and supports fanout up to 10 LSTTL loads.

Inverter Gates Feature Summary

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

Inverter Gates Applications

• Alarm or tamper detect circuits
• S-R latch configurations

Inverter Gates Procurement Notes

Verify the specific ordering suffix 'SR' corresponds to the SOP (NS) package and tape-and-reel carrier format. Confirm RoHS compliance status and lead finish specifications against the latest TI Package Option Addendum. Ensure the component meets the required thermal resistance and junction temperature limits for the intended application environment.

Inverter Gates Selection Notes

Select this component when a dual 4-input NAND configuration is required within standard CMOS logic families. Consider the wide operating voltage range and low power consumption relative to LSTTL alternatives. Verify that the SOP package dimensions and pinout align with the PCB layout requirements and that the propagation delay characteristics meet the system timing constraints.

Inverter Gates Part Context

This part belongs to the SNx4HC20 series of dual 4-input NAND gates produced by Texas Instruments. The HC series represents high-speed CMOS technology designed to offer performance improvements over earlier logic families while maintaining compatibility with TTL inputs. The NS package designation indicates a small outline package variant suitable for surface-mount assembly.

Inverter Gates Replacement Considerations

SN74HC20DR

Inverter Gates FAQ

How should unused inputs be handled?

Unused inputs must not be left floating. They should be terminated to either VCC or ground using pull-up or pull-down resistors to prevent undefined operational states and excessive current consumption.

What are the input transition time requirements?

Input signals must have fast edge rates as defined in the Recommended Operating Conditions. Slow input edge rates can cause oscillations and damaging shoot-through current.