A3240ELT-T Allegro Microsystems Inc, A3240ELT-T Datasheet

A3240ELT-T

Manufacturer Part Number

A3240ELT-T

Description

IC SWITCH HALL EFFECT SOT-89

Manufacturer

Allegro Microsystems Inc

Type

Special Purposer

Datasheets

1.A3240ELHLT-T.pdf (11 pages)

2.A3240ELT-T.pdf (10 pages)

Specifications of A3240ELT-T

Sensing Range

50G Trip, 5G Release

Voltage - Supply

4.2 V ~ 24 V

Current - Supply

6mA

Current - Output (max)

25mA

Output Type

Digital, Open Collector

Features

Regulated Voltage

Operating Temperature

-40°C ~ 85°C

Package / Case

SOT-89-3

Magnetic Type

Bipolar

Operating Supply Voltage (min)

4.2V

Operating Supply Voltage (typ)

5/9/12/15/18V

Operating Supply Voltage (max)

24V

Output Current

25mA

Mag Sensor Operate Point (g)

50Gs

Mag Sensor Release Point (g)

5Gs

Mag Sensor Hysteresis(g)

10Gs

Package Type

SOT-89

Pin Count

3 +Tab

Mounting

Surface Mount

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Features and Benefits

▪ Resistant to Physical Stress

▪ Superior Temperature Stability

▪ Output Short-Circuit Protection

▪ Operation From Unregulated Supply

▪ Reverse Battery Protection

▪ Sol id-State Reliability

▪ Small Size

Packages:

27621.20g

Not to scale

3-pin SOT89

(LT package)

3-pin SOT23W

(LH package)

REG.

SUPPLY

Functional Block Diagram

(UA package)

SUBCIRCUITS

3-pin SIP

TO ALL

Description

The A3240 Hall-effect switch is an extremely tempera-

ture-stable and stress-resistant sensor especially suited for

operation over extended tem per a ture ranges to +150°C.

Superior high-temperature per for mance is made possible

through dynamic offset cancellation, which reduces the

residual offset voltage normally caused by device overmolding,

tem per a ture de pen den cies, and thermal stress.

The device includes on a single silicon chip a voltage regulator,

Hall-voltage generator, small-signal amplifier, chopper

sta bi li za tion, Schmitt trigger, and a short-circuit protected

open-collector output to sink up to 25 mA. A south pole of

sufficient strength will turn the output on. An on-board regulator

permits operation with supply voltages of 4.2 to 24 volts.

Three package styles provide a magnetically op ti mized pack age

for most ap pli ca tions. Package type LH is a modified SOT23W

surface-mount package, LT is a miniature SOT89/TO-243AA

transistor package for surface-mount applications; while UA is

a three-lead ultra-mini-SIP for through-hole mounting. The LH

and UA packages are also available in a lead (Pb) free version

(suffix, –T) , with a 100% matte tin plated leadframe.

Chopper-Stabilized, Precision

CONTROL

CURRENT

LIMIT

Hall-Effect Switch

GROUND

Dwg. FH-020-1

OUTPUT

A3240

Related parts for A3240ELT-T

A3240ELT-T Summary of contents

Page 1

Features and Benefits ▪ Resistant to Physical Stress ▪ Superior Temperature Stability ▪ Output Short-Circuit Protection ▪ Operation From Unregulated Supply ▪ Reverse Battery Protection ▪ Sol id-State Reliability ▪ Small Size Packages: 3-pin SOT89 3-pin SOT23W (LT package) (LH ...

Page 2

... A3240 Selection Guide Part Number Packing 1 A3240ELHLT-T 7-in. reel, 3000 pieces/reel Surface Mount A3240ELT-T Bulk, 500 pieces/bag 2 A3240ELTTR-T 7-in. reel, 1000 pieces/reel Surface Mount A3240EUA-T Bulk, 500 pieces/bag A3240LLHLT-T 7-in. reel, 3000 pieces/reel Surface Mount A3240LLT-T Bulk, 500 pieces/bag 2 A3240LLTTR-T 7-in. reel, 1000 pieces/reel Surface Mount ...

Page 3

A3240 Suffix ‘–LT’ & ‘–UA’ Pinning (SOT89/TO-243AA & ultra-min SIP 800 700 600 500 400 300 200 100 Chopper-Stabilized, Precision Hall-Effect Switch PTCT 3 Dwg. PH-003-2 Pinning is shown viewed from branded side. Package Power ...

Page 4

A3240 ELECTRICAL CHARACTERISTICS over operating temperature range. Characteristic Supply Voltage Range Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time Chopping Frequency Output Rise Time Output Fall Time Supply Current Reverse Battery Current Zener Voltage Zener Impedance NOTES: ...

Page 5

A3240 TYPICAL OPERATING CHARACTERISTICS OUTPUT SATURATION VOLTAGE 300 OUT 200 100 0 - AMBIENT TEMPERATURE IN C Chopper-Stabilized, Precision ...

Page 6

A3240 TYPICAL OPERATING CHARACTERISTICS OUTPUT SATURATION VOLTAGE 250 225 200 175 150 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE IN VOLTS Chopper-Stabilized, Precision Hall-Effect Switch as a function of supply voltage SWITCH POINTS OPERATE POINT RELEASE POINT ...

Page 7

A3240 Chopper-Stabilized Technique. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. These devices use a proprietary dynamic offset ...

Page 8

A3240 +0.12 2.98 –0.08 1.49 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case ...

Page 9

A3240 Package LT, 3-Pin (SOT89/TO-243AA) +0.15 2.45 +0.15 –0.16 4.10 –0.16 1 0.42±0.06 0.50±0.06 For Reference Only; not for tooling use (reference JEDEC. TO-243AA) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and ...

Page 10

A3240 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2000-2008, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; ...

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