LM3909 National Semiconductor, LM3909 Datasheet

LM3909

Manufacturer Part Number

LM3909

Description

LM3909 LED Flasher/Oscillator

Manufacturer

National Semiconductor

Datasheet

1.LM3909.pdf (8 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM3909

Quantity:

5 510

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM3909

Quantity:

5 510

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM3909M

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM3909N

Manufacturer:

NSC

Quantity:

1 020

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM3909N

Manufacturer:

NSC

Quantity:

2 436

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM3909N

Manufacturer:

NS/国半

Quantity:

20 000

Current page: 1 of 8
Download datasheet (150Kb)

C 1995 National Semiconductor Corporation

LM3909 LED Flasher Oscillator

General Description

The LM3909 is a monolithic oscillator specifically designed

to flash Light Emitting Diodes By using the timing capacitor

for voltage boost it delivers pulses of 2 or more volts to the

LED while operating on a supply of 1 5V or less The circuit

is inherently self-starting and requires addition of only a bat-

tery and capacitor to function as an LED flasher

Packaged in an 8-lead plastic mini-DIP the LM3909 will op-

erate over the extended consumer temperature range of

and operation from weak batteries so that continuous oper-

ation life exceeds that expected from battery rating

Application is made simple by inclusion of internal timing

resistors and an internal LED current limit resistor As

shown in the first two application circuits the timing resis-

tors supplied are optimized for nominal flashing rates and

minimum power drain at 1 5V and 3V

Timing capacitors will generally be of the electrolytic type

and a small 3V rated part will be suitable for any LED flasher

using a supply up to 6V However when picking flash rates

it should be remembered that some electrolytics have very

broad capacitance tolerances for example

Schematic Diagram

25 C to

100%

70 C It has been optimized for low power drain

TL H 7969

Typical 1 5V Flasher

20% to

Features

Applications

Operation over one year from one C size flashlight cell

Bright high current LED pulse

Minimum external parts

Low cost

Low voltage operation from just over 1V to 5V

Low current drain averages under 0 5 mA during

battery life

Powerful as an oscillator directly drives an 8

Wide temperature range

Finding flashlights in the dark or locating boat mooring

floats

Sales and advertising gimmicks

Emergency locators for instance on fire extinguishers

Toys and novelties

Electronic applications such as trigger and sawtooth

generators

Siren for toy fire engine (combined oscillator speaker

driver)

Warning indicators powered by 1 4V to 200V

TL H 7969 – 1

Connection Diagram

See NS Package Number N08E

Order Number LM3909N

Dual-In-Line Package

Top View

RRD-B30M115 Printed in U S A

February 1995

TL H 7969 – 2

speaker

Related parts for LM3909

Related keywords

LM3909 datasheet
LM3909 data sheet
LM3909 pdf datasheet
LM3909 component
LM3909 part
LM3909 distributor
LM3909 RoHS
LM3909 datasheet download