ST LS1240A Electronic Two-Tone Ringer SO8 OT0087T

£20.00

90 in stock

SKU: OT0087T Category:

Description

WE ARE RICH ELECTRONICS

WE PURCHASE AND RECYCLE 

SURPLUS ELECTRONIC

COMPONENTS AND EQUIPMENT!

For sale here we have the above…

1 Piece

ST LS1027 (ST are now STMicroelectronics)

Features
■ Low current consumption, in order to allow the
parallel operation of 4 devices
■ Integrated rectifier bridge with zener diodes to
protect against over voltages little external
circuitry
■ Tone and switching frequencies adjustable by
external components
■ Integrated voltage and current hysteresis
Description
LS1240 is a monolithic integrated circuit designed
to replace the mechanical bell in telephone sets in
connection with an electro-acoustical converter. It
can drive directly a piezoceramic converter
(buzzer) or a dynamic loudspeaker.
The output current capability of LS1240 is higher
than the one of a standard ringer. To drive a
dynamic loudspeaker LS1240 can simply use a
decoupling capacitor, thus eliminating the usual
transformer.
No current limitation is provided on the output
stage of LS1240, so a minimum load DC of 50Ω
is advised, in series with a proper capacitor.
The two tone frequencies generated are switched
by an internal oscillator in a fast sequence and
are made audible across an output amplifier in the
loudspeaker. Both tone frequencies and the
switching frequency can be externally adjusted.
The supply voltage is obtained from the AC ring
signal and the circuit is designed so that noise on
the line or variations of the ringing signal cannot
affect correct operation of the device.
Specifications
Manufacturer
STMicroelectronics
Series
–
Packaging
Tube
Part Status
Obsolete
Function
Tone Ringer
Interface
–
Number of Circuits
1
Voltage – Supply
26V
Current – Supply
30mA
Operating Temperature
-40°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
SO-8
Supplier Device Package
SO-8
Base Product Number
LS1240

What you see in the above photographs is what you will get ie. the picture is of one of our actual stock so you can check condition date code etc.

Now Obsolete!

For datasheet search…LS1240A

Or go directly to…

https://www.alldatasheet.com/datasheet-pdf/view/520436/STMICROELECTRONICS/E-LS1240A.html

PLEASE NOTE!

These parts came to us as part of a lot of surplus stock from a large ‘Milspec’ Co. and have been kept in storage for some time, we have therefore classified them as ‘new other’. They are however in good serviceable condition, stored with us still in their original packaging/tubes, the photographs are representative of their general appearance, being of one of our actual stock, and, as with all our products they come with a full guarantee.

If you have similar items to this, or indeed any electronic components that are surplus to requirements please contact us with details.

Additional information

Brand

MPN

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