SN74LS240NSR

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SN74LS240NSR

IC BUFFER INVERT 5.25V 20SO

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Specifications

Supplier Texas Instruments
Package Tape & Reel (TR),Cut Tape (CT)
Series 74LS
ProductStatus Active
LogicType Buffer, Inverting
NumberofElements 2
NumberofBitsperElement 4
OutputType 3-State
Current-OutputHighLow 15mA, 24mA
Voltage-Supply 4.75V ~ 5.25V
OperatingTemperature 0°C ~ 70°C (TA)
MountingType Surface Mount
Package/Case 20-SOIC (0.209, 5.30mm Width)

Overview

Description

The SN74LS240NSR is an octal buffer/line driver with 3-state outputs from the TI 74LS TTL family. It contains two independent 4-bit buffers (A0–A3 to Y0–Y3 and A4–A7 to Y4–Y7) with separate output-enable controls. When the enables are active, data on the inputs appears at the outputs; when disabled, all outputs go high impedance, allowing multiple devices to share a common bus without contention. It runs from a 5 V supply (typical 4.75–5.25 V) and accepts TTL-level inputs. Each output can source/sink a modest current suitable for driving TTL/CMOS inputs, but not heavy loads. Common uses include buffering data between a microprocessor or FPGA and memory/peripherals, expanding fan-out, and isolating devices on a bus. The NSR suffix indicates a specific TI packaging/variant (e.g., surface-mount or other).

Features

Here are the key features of the SN74LS240NSR:
- 8-bit noninverting buffer/driver with 3-state (tri‑state) outputs
- Two 4-bit sections: A0–A3 → Y0–Y3 and A4–A7 → Y4–Y7
- Independent, active-low enable inputs (G1 and G2); outputs are High-Z when disabled
- TXL/LS TTL technology (Low-Power Schottky)
- Single 5V supply (typical range about 4.75V–5.25V)
- TTL-compatible inputs; suitable for bus buffering and sharing data/address lines
用途: buffering and isolating devices on a shared bus, allowing multiple devices to drive a common set of lines without interference.

Package

SOIC-14 (Small Outline Integrated Circuit) package, 14 pins (plastic, surface-mount).

Pinout

- Pin count: 20 pins (DIP-20 / SOIC-20 depending on package)
- Function: Octal buffer/line driver with 3-state outputs. It contains two 4-bit buffer sections (A0–A3 to Y0–Y3 and A4–A7 to Y4–Y7) with independent output-enable controls, allowing the eight outputs to be placed in high-impedance for bus sharing.

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: A multinational American technology company that designs and manufactures semiconductors and related ICs (analog and digital), and is one of the world’s largest semiconductor firms.

Application

SN74LS240NSR is an octal buffer/line driver with 3-state outputs (two 4-bit buffers). Applications include:
- CPU/memory and I/O bus interfacing
- Buffering and isolating devices to reduce fan-out/load
- Interfacing TTL/CMOS domains
- Data path multiplexing/demultiplexing
- General-purpose 8-bit buffering with tri-state control.

Equivalent

Functional equivalents are other vendors’ octal buffer/driver with 3-state outputs in the 74LS family, e.g. 74LS240N from NXP/Nexperia, ON Semiconductor, Toshiba, Renesas, etc. Also a CMOS-style alternative is the 74ACT240 (not drop-in due to different voltage thresholds). Check pinout and packaging when substituting.

Shipping

Shipping MethodsWe

offer global shipping services through DHL, FedEx, TNT, UPS, or any other forwarder of your choice.


Shipping Fee Reference (DHL/FedEx):

DHL: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 2-5 business days.

FedEx: Shipping cost ranges from $25-$40 (0.5kg), with an estimated delivery time of 3-7 business days.

UPS: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 3-7 business days.

TNT: Shipping cost ranges from $25-$65 (0.5kg), with an estimated delivery time of 3-7 business days.

EMS: Shipping cost ranges from $30-$50 (0.5kg), with an estimated delivery time of 7-15 business days.

Registered Air Mail: Shipping cost is $2-$4 (0.1kg), with an estimated delivery time of 5-20 business days.

Payments

Payment Methods

The Payment term is 100% Prepaid.

Currently, we only accept the below payment methods:

1. PayPal

2. Credit/ Debit Card

3. Wire Transfer

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