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SN74LS08N

Quad 2-input AND gate, LS TTL, 15ns, 5V, 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 is a quad 2-input positive AND gate from Texas Instruments in LS (Low-power Schottky) technology with 14-pin PDIP through-hole 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, 27ns max
Output Low Current (IOL)	8mA
Output High Current (IOH)	-0.4mA
Input Voltage Low (VIL max)	0.8V
Input Voltage High (VIH min)	2.0V
Supply Current (all gates)	8.8mA max (outputs high)
Operating Temperature	0°C to +70°C
Package	PDIP-14 (19.3 x 6.35mm)

Features

Four independent 2-input AND gates in one package
LS TTL technology: low power, high speed
Direct replacement for 7408 and 74LS08
Input clamp diodes for undershoot protection
Standard 14-pin PDIP through-hole package
Widely available and cost-effective

Applications

General-purpose logic gating
Address decoding and chip select generation
Data validation and clock gating
Digital signal conditioning
Educational and hobby projects

Product Introduction:SN74LS08N Product Introduction

The SN74LS08N from Texas Instruments contains four independent 2-input positive AND gates in a 14-pin PDIP through-hole package. The LS (Low-power Schottky) technology provides 15ns typical propagation delay with 8mA output sink current. Each AND gate outputs HIGH only when both inputs are HIGH; otherwise the output is LOW. The device is a direct replacement for the classic 7408 and 74LS08 from any manufacturer. Input clamp diodes protect against negative voltage undershoot. The N suffix denotes the PDIP through-hole package, making it suitable for prototyping, education, and legacy board designs.

Working Principle:SN74LS08N Working Principle

Each of the four AND gates in the SN74LS08N implements the Boolean AND function: the output is HIGH (logic 1) only when both input A and input B are HIGH. In all other input combinations (A=0/B=0, A=0/B=1, A=1/B=0), the output is LOW (logic 0). The truth table is: A=0, B=0 → Y=0; A=0, B=1 → Y=0; A=1, B=0 → Y=0; A=1, B=1 → Y=1. The LS Schottky technology uses Schottky-diode-clamped transistors that prevent deep saturation, resulting in faster switching (15ns) compared to standard TTL (22ns) while consuming less power. The totem-pole output stage provides active pull-up and pull-down, with 8mA sink capability for driving multiple TTL loads.

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
4	2A	Input	Gate 2 input A
5	2B	Input	Gate 2 input B
6	2Y	Output	Gate 2 output
7	GND	Power	Ground
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 (4.75V to 5.25V)

Application Scenarios:In which products and applications isSN74LS08N used

Address Decode: Combine upper address lines to generate chip-select signals for memory-mapped peripherals
Clock Gating: AND a clock signal with an enable signal to conditionally pass clocks to sub-circuits
Data Validation: AND a data ready signal with an acknowledge signal to gate data transfers
Logic Synthesis: Fundamental building block for custom combinational logic circuits in education and prototyping
Legacy Maintenance: Direct 7408 replacement for repair of vintage TTL-based equipment

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.