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SN74LS08N

Quad 2-input AND gate, LS TTL, 15ns, PDIP-14

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Manufacturer Part：

SN74LS08N

Package：

PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The SN74LS08N from Texas Instruments is a quad 2-input positive AND gate with LS TTL technology, 15ns propagation delay, and industry-standard 7408 pinout in a 14-pin PDIP package.

Key Specifications

Number of Gates	4 (quad 2-input AND)
Logic Family	LS (Low-power Schottky)
Supply Voltage	4.75V to 5.25V (5V nominal)
Propagation Delay	15ns typical @ 5V
Output Drive (IOL/IOH)	8mA / -0.4mA
Operating Temperature	0°C to +70°C
Package	PDIP-14 (19.3 x 6.35mm)

Features

Four independent 2-input AND gates
LS TTL technology
15ns typical propagation delay
Industry-standard 7408 pinout

Applications

Signal gating (enable with condition)
Address decoding
Clock enabling
Data validation

Product Introduction:SN74LS08N Product Introduction

The SN74LS08N from Texas Instruments contains four independent 2-input AND gates in a 14-pin PDIP package. Each gate performs Y = A AND B; the output is HIGH only when BOTH inputs are HIGH. The AND gate is fundamental to digital logic: it implements the logical conjunction, the core of conditional enabling. When a data signal must pass only when an enable condition is met, the AND gate is the natural choice. In address decoding, multiple high-order address bits are ANDed to generate a chip select signal. The 7408 is the AND counterpart of the 7400 NAND: same pinout, but non-inverted output. DeMorgan’s theorem shows that AND can be built from NAND + inverter, but the dedicated 7408 is simpler and faster. The N suffix denotes the PDIP-14 through-hole package.

Working Principle:SN74LS08N Working Principle

Each AND gate in the SN74LS08N performs Y = A AND B. Truth table: 00→0, 01→0, 10→0, 11→1. The output is HIGH only when both inputs are HIGH simultaneously. For gating: one input carries the signal (data, clock), the other carries the enable. When enable is HIGH, the signal passes through; when enable is LOW, the output is always LOW regardless of the signal. For active-LOW enabling, use a NAND gate instead. For 3-input AND, cascade: feed the output of one 2-input AND and the third input into another AND gate. For a 4-input AND, use three 2-input AND gates in a tree structure. The AND gate is also used in product-of-sums logic: A AND B = A·B in Boolean algebra. The 15ns propagation delay means the output responds to input changes within 15ns.

Pin Description:SN74LS08N Pin Definition and Functions

Pin	Name	Type	Description
1	1A	Input	Gate 1 input A
2	1B	Input	Gate 1 input B
3	1Y	Output	Gate 1 output (AND)
4	2A	Input	Gate 2 input A
5	2B	Input	Gate 2 input B
6	2Y	Output	Gate 2 output (AND)
7	GND	Power	Ground
8	3Y	Output	Gate 3 output (AND)
9	3A	Input	Gate 3 input A
10	3B	Input	Gate 3 input B
11	4Y	Output	Gate 4 output (AND)
12	4A	Input	Gate 4 input A
13	4B	Input	Gate 4 input B
14	VCC	Power	Supply (5V)

Application Scenarios:In which products and applications isSN74LS08N used

Clock Gate: Clock signal on input A; enable on input B; output = gated clock; stops when enable=LOW
Address Decode: A15 and A14 → AND gate; output HIGH only when both address bits are HIGH; chip select for memory range
Data Enable: Data signal on input A; read-enable on input B; output = data only when read-enable is HIGH
3-Input AND: Output of gate 1 (A AND B) feeds input of gate 2 with C; result = A AND B AND C

Alternative Models:What chips are recommended as replacements for SN74LS08N

Model	Manufacturer	Key Difference	Package	Supply
74LS08N	TI/Nexperia	Original TTL version with 5V-only supply, typical propagation delay 10-15ns	DIP-14	5V TTL
74LS08D	TI/Nexperia	Surface-mount SOIC version of LS with identical logic function	SOIC-14	5V TTL
74HC08D	TI/Nexperia	CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity	SOIC-14	2-6V CMOS
74HC08N	TI/Nexperia	Through-hole DIP version of HC family for prototyping and repair	DIP-14	2-6V CMOS
74HCT08D	TI/Nexperia	CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V	SOIC-14	4.5-5.5V TTL-in
74HCT08N	TI/Nexperia	Through-hole DIP version of HCT family for prototyping and repair	DIP-14	4.5-5.5V TTL-in
74AC08D	TI/Nexperia	Advanced CMOS with 2-6V supply and higher output drive current (24mA vs 6mA for HC)	SOIC-14	2-6V CMOS
74AC08N	TI/Nexperia	Through-hole DIP version of AC family for prototyping and repair	DIP-14	2-6V CMOS
74LVC08D	TI/Nexperia	Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs	SOIC-14	1.65-3.6V CMOS
74LVC08N	TI/Nexperia	Through-hole DIP version of LVC family for prototyping and repair	DIP-14	1.65-3.6V CMOS

The 7408 is a Quad 2-Input AND Gate. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.