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74HCT08D

Quad 2-input AND gate, TTL inputs, 4.5-5.5V, 11ns, SOIC-14

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Manufacturer Part：

74HCT08D

Package：

SOIC-14 / SOT108-1 (8.75×3.9×1.45 mm, 1.27mm pitch)

Description

Product Overview

The 74HCT08D from Nexperia is a quad 2-input AND gate with TTL-compatible input levels in an SOIC-14 package. Inputs include clamp diodes for overvoltage interfacing. Operating from 4.5V to 5.5V with 11 ns propagation delay, it provides CMOS low power consumption with TTL input thresholds, making it ideal for mixed 5V TTL/CMOS systems and glue logic.

Key Specifications

Logic Function	Quad 2-input AND gate
Supply Voltage	4.5V to 5.5V (HCT)
Propagation Delay	11 ns typical @ 5V
Output Drive	±4 mA (HIGH), ±5.2 mA (LOW)
Max Frequency	36 MHz
Input Levels	TTL (74HCT08)
Quiescent Current	Low (CMOS)
ESD Protection	HBM >2000V, CDM >1000V
Operating Temperature	-40°C to +125°C
Package	SOIC-14 (SOT108-1, 8.75×3.9 mm)

Features

TTL-compatible input levels for 5V system interfacing
Input clamp diodes for overvoltage protection
CMOS low power dissipation
High noise immunity
Balanced propagation delays
ESD protection: HBM >2000V, CDM >1000V
Complies with JEDEC standards
Pin-compatible with 74HC08D (CMOS input version)

Applications

TTL-to-CMOS logic interfacing
5V microcontroller glue logic
Data validation and enable gating
Industrial control logic

Product Introduction:74HCT08D Product Introduction

The 74HCT08D from Nexperia is a quad 2-input AND gate with TTL-compatible input levels, operating from 4.5V to 5.5V with 11 ns propagation delay in an SOIC-14 package. With input clamp diodes, CMOS low power, and high noise immunity, it is ideal for 5V TTL/CMOS system interfacing, microcontroller glue logic, and data validation.

Working Principle:74HCT08D Working Principle

The 74HCT08D implements four independent 2-input AND gates. Each gate performs the Boolean function Y = A AND B, outputting HIGH only when both inputs are HIGH. The HCT variant uses a special input stage with TTL-compatible threshold voltages (VIH = 2.0V, VIL = 0.8V), allowing direct interface with 5V TTL outputs from microcontrollers and legacy logic families. The output stage is standard CMOS push-pull, providing rail-to-rail output swings. Input clamp diodes protect against voltages exceeding VCC or below GND. The CMOS construction ensures minimal quiescent power consumption, while the TTL input levels make it a natural choice for bridging 5V TTL outputs to CMOS logic.

Pin Description:74HCT08D Pin Definition and Functions

Pin	Name	Type	Function
1	1A	Input	Gate 1 input A (TTL level)
2	1B	Input	Gate 1 input B (TTL level)
3	1Y	Output	Gate 1 output (1A AND 1B)
4	2A	Input	Gate 2 input A
5	2B	Input	Gate 2 input B
6	2Y	Output	Gate 2 output
7	GND	Power	Ground (0V)
8	3Y	Output	Gate 3 output
9	3A	Input	Gate 3 input A
10	3B	Input	Gate 3 input B
11	4Y	Output	Gate 4 output
12	4A	Input	Gate 4 input A
13	4B	Input	Gate 4 input B
14	VCC	Power	Supply voltage (4.5-5.5V)

Application Scenarios:In which products and applications is74HCT08D used

TTL-to-CMOS logic bridging in mixed 5V systems
5V microcontroller glue logic and peripheral interfacing
Data validation: checking multiple conditions before enabling
Industrial control logic with TTL-compatible signal levels

Alternative Models:What chips are recommended as replacements for 74HCT08D

Manufacturer	Part Number	Package	Notes
Nexperia	74HC08D	SOIC-14	CMOS input levels (2.0-6.0V)
TI	SN74HCT08DR	SOIC-14	Functionally equivalent
ON Semi	MC74HCT08ADR2G	SOIC-14	Functionally equivalent
Nexperia	74HCT08PW	TSSOP-14	Smaller footprint
Nexperia	74AHC08D	SOIC-14	Advanced HC, faster, wider voltage