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74HCT08D

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

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Pieza del fabricante：

74HCT08D

Paquete：

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

Descripción

Productos

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.

Especificaciones

Logic Function	Quad 2-input AND gate
Tensión de alimentación	4.5V to 5.5V (HCT)
Retardo de propagación	11 ns typical @ 5V
Output Drive	±4 mA (HIGH), ±5.2 mA (LOW)
Max Frequency	36 MHz
Input Levels	TTL (74HCT08)
Corriente de reposo	Low (CMOS)
ESD Protection	HBM >2000V, CDM >1000V
Temperatura de funcionamiento	-40°C to +125°C
Paquete	SOIC-14 (SOT108-1, 8.75×3.9 mm)

Características

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)

Aplicaciones

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

Introducción del producto:74HCT08D Presentación del producto

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.

Principio de funcionamiento:74HCT08D Principio de funcionamiento

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.

Descripción de la clavija:74HCT08D Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	1A	Entrada	Gate 1 input A (TTL level)
2	1B	Entrada	Gate 1 input B (TTL level)
3	1Y	Salida	Gate 1 output (1A AND 1B)
4	2A	Entrada	Gate 2 input A
5	2B	Entrada	Gate 2 input B
6	2Y	Salida	Gate 2 output
7	GND	Potencia	Tierra (0V)
8	3Y	Salida	Gate 3 output
9	3A	Entrada	Gate 3 input A
10	3B	Entrada	Gate 3 input B
11	4Y	Salida	Gate 4 output
12	4A	Entrada	Gate 4 input A
13	4B	Entrada	Gate 4 input B
14	VCC	Potencia	Supply voltage (4.5-5.5V)

Application Scenarios:In which products and applications is74HCT08D usado

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

Fabricante	Número de pieza	Paquete	Notas
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