74HCT08D

Overview

The Toshiba Semiconductor and Storage 74HCT08D is a high-speed CMOS quad 2-input AND gate fabricated with silicon gate C2MOS technology. It operates within a supply voltage range of 2.0 V to 6.0 V, featuring low power dissipation of 1.0 µA maximum at 25°C and typical propagation delay of 10 ns at 5 V. The device provides balanced propagation delays and includes input clamp diodes for interfacing with voltages exceeding VCC via current-limiting resistors. It is housed in a 14-pin SOIC package.

Feature Summary

• High-speed operation comparable to equivalent LSTTL while maintaining CMOS low power dissipation
• Inputs compatible with TTL, NMOS, and CMOS output voltage levels
• Internal circuit composed of four stages including buffer output for high noise immunity
• All inputs equipped with protection circuits against static discharge or transient excess voltage

Applications

• Level converter for interfacing TTL or NMOS to high speed CMOS
• Digital logic systems requiring quad 2-input AND functionality
• General purpose digital signal processing applications

Procurement Notes

Verify the specific manufacturer designation as Toshiba Semiconductor and Storage when sourcing. Confirm the package type is 14-SOIC. Check RoHS compliance status and ensure the part number matches the exact suffix required for your assembly process. Validate that the component meets the specified operating temperature range for your application environment before finalizing procurement.

Selection Notes

Select this component when TTL compatibility is required alongside CMOS low power consumption. The HCT series ensures direct interface with standard TTL logic outputs without additional level shifting components. Consider the 14-SOIC package for surface mount assembly requirements. Ensure the design accounts for the specified input protection characteristics if interfacing with external sources.

Part Context

This component belongs to the 74HCT logic family, which bridges the gap between standard CMOS and TTL logic families. It offers the noise immunity and power efficiency of CMOS while maintaining the input voltage thresholds necessary for seamless integration with existing TTL-based digital systems. The quad configuration provides multiple independent logic gates in a single compact package.

Replacement Considerations

Public confirmed substitute part numbers include 74HCT08D(BJ). Verify pinout compatibility and electrical specifications before substitution.