Mfr Part #:

LS1240AD1

Mfr Name: ST

The STMicroelectronics LS1240AD1 is an electronic two-tone ringer designed for telephone sets. It features low current consumption and adjustable tone frequencies.

✓ Total Stock: 267,913 pcs

$ Price Range: $1.88

LS1240AD1 Available from 3 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Romaks Technologies ✓ Non-Authorised Inventory information	258,286 pcs On Request	258286 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Fe Components ✓ Non-Authorised Inventory information	7,122 pcs On Request	7122 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Xingangxin ✓ Non-Authorised Inventory information	2,505 pcs On Request	2505 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

LS1240AD1 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	ST
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 70°C
Supplier Device Package	8-SOIC
Tape & Reel	No

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LS1240AD1 Description

Short technical summary and product information.

The LS1240AD1 from STMicroelectronics is a monolithic integrated circuit designed to replace mechanical bells in telephone sets. It functions as an electronic two-tone ringer, capable of driving piezoceramic converters or dynamic loudspeakers directly. This device offers low current consumption, allowing for parallel operation of up to four units.

The LS1240AD1 features an integrated rectifier bridge with zener diodes for overvoltage protection. Its tone and switching frequencies can be adjusted using external components, providing design flexibility. The circuit is designed to operate reliably from the AC ring signal, unaffected by line noise or variations.

This IC is housed in an 8-SOIC surface-mount package. It operates with a supply voltage of up to 26V and has a typical supply current of 1.8mA without load. The operating temperature range is -40°C to 70°C.

Key electrical characteristics include an activation voltage of 13.2V and a sustaining voltage of 9V. The output voltage swing is typically VS-5V, with a short circuit current capability of 70mA. The output frequencies can be adjusted, with typical values around 1.74kHz under specific conditions.

LS1240AD1 Quick Information

Product Type: Tone Ringer

Canonical Name: LS1240AD1 Electronic Two-Tone Ringer

Subcategory: Tone Ringer

LS1240AD1 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

LS1240AD1 Estimated Pricing

Qty	Low	High
1+	$1.88	$1.88

Estimated market price range - modelled values for guidance only, not live distributor offers.

LS1240AD1 Features

Electronic two-tone ringer for telephone sets.
Low current consumption for parallel operation.
Adjustable tone and switching frequencies.
Drives piezoceramic converters or loudspeakers.
Operates from AC ring signal.

LS1240AD1 Applications

Used in telecom interface circuits.
Suitable for telephone ringers and alert systems.
Ideal for driving piezoceramic buzzers or speakers.
Applicable in line protection and voltage regulation.
Used in two-tone signaling applications.

LS1240AD1 FAQs

4 frequently asked questions generated from this part’s specifications.

What is the supply voltage for the LS1240AD1?

The maximum supply voltage for the LS1240AD1 is 26V.

What is the typical supply current of the LS1240AD1?

The typical supply current without load is 1.8mA.

What is the operating temperature range for the LS1240AD1?

The LS1240AD1 operates in a temperature range of -40°C to 70°C.

What package type is the LS1240AD1 supplied in?

The LS1240AD1 is supplied in an 8-SOIC package.