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LM340 Voltage Regulator: Datasheet, Pinout and Circuit

Q: What is LM340 used for?

The LM340 is intended as a fixed voltage regulator in a wide range of applications including local (on-card) regulation for the elimination of noise and distribution problems associated with single-point regulation.

Q: How does a voltage regulator work?

A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. It compares the output voltage with a precise reference voltage and adjusts the pass device to maintain a constant output voltage.

Q: What is the substitute for LM340?

LM340 is a 1A, positive voltage three-terminal regulator. There is also a 2-digit suffix after. Depending on the suffix, the voltage regulator is divided into 5V, 6V, 8V, 12V, 15V, 18V, 24V. It can be replaced by the corresponding 78 series three-terminal regulator, the pins, wiring, drawings, and principles are the same.

UTMEL

Published: 28 September 2021 | Last Updated: 28 September 2021

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datasheet pdf and product details from stock available at Utmel

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LM340 is a 1.5-A fixed voltage regulator. This article mainly covers datasheet, pinout, circuit, applications, and more details about LM340 voltage regulator. Furthermore, there is a huge range of semiconductors, capacitors, resistors, and Ics in stock. Welcome RFQ!

LM340T-5

Catalog

LM340 Pinout

LM340 PINOUT.png

LM340 Pinout

Pin Name	Pin NO.	I/O	Description
INPUT	1	I	Input voltage pin
GND	2	I/O	Ground pin
OUTPUT	3	O	Output voltage pin

LM340 CAD Model

Footprint

LM340 FOOTPRINT.jpg

Footprint

3D Model

LM340 3D MODEL.png

3D Model

LM340 Description

The LM340 is a 3-terminal positive voltage regulator that employs internal current-limiting, thermal shutdown, and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over the 1.5-A output current.

Specifications

technical specifications, attributes, parameters and parts with similar specifications to .

Type
Parameter

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LM340 Features

Output Current up to 1.5 A
Available in Fixed 5-V, 12-V, and 15-V Options
Output Voltage Tolerances of ±2% at TJ = 25°C (LM340A)
Line Regulation of 0.01% / V of at 1-A Load (LM340A)
Load Regulation of 0.3% / A (LM340A)
Internal Thermal Overload, Short-Circuit and SOA Protection
Available in Space-Saving SOT-223 Package
Output Capacitance Not Required for Stability

LM340 Functional Block Diagram

lm340 functional block diagram.jpg

LM340 Functional Block Diagram

LM340 Application

Industrial Power Supplies
SMPS Post Regulation
HVAC Systems
AC Inventors
Test and Measurement Equipment
Brushed and Brushless DC Motor Drivers
Solar Energy String Inverters

How to Use the LM340 to Get Adjustable Output

According to the formula, this simple circuit produces the lm340 variable output voltage.

Formula: Vout=5v+ (5v/R1+IQ) R2

lm340 circuit.jpg

LM340 Circuit

Increasing the LM340's Current Output

This circuit provides up to 5A of the regulated output. Q1 is turned off at low currents. It is based only when the current exceeds 600mA.

lm340 current.jpg

LM340 Current

Parts with Similar Specs

LM340 Dimension

lm340 dimension.jpg

LM340 Dimension

LM340 Manufacturer

Texas Instruments (TI) is a global semiconductor firm originating in 1958 and nowadays it has over 30,000 employees who design, conduct, and sell analog and product-differentiating embedded processing components in 35 countries. Aimed at changing the world of tech, TI has put great effort into becoming the solution provider coupled with a vision.

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Frequently Asked Questions

What is LM340 used for?

The LM340 is intended as a fixed voltage regulator in a wide range of applications including local (on-card) regulation for the elimination of noise and distribution problems associated with single-point regulation.

How does a voltage regulator work?

A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. It compares the output voltage with a precise reference voltage and adjusts the pass device to maintain a constant output voltage.

What is the substitute for LM340?

LM340 is a 1A, positive voltage three-terminal regulator. There is also a 2-digit suffix after. Depending on the suffix, the voltage regulator is divided into 5V, 6V, 8V, 12V, 15V, 18V, 24V.
It can be replaced by the corresponding 78 series three-terminal regulator, the pins, wiring, drawings, and principles are the same.

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