A3240ELT Allegro Microsystems Inc, A3240ELT Datasheet

A3240ELT

Manufacturer Part Number

A3240ELT

Description

Manufacturer

Allegro Microsystems Inc

Datasheet

1.A3240ELT.pdf (10 pages)

Specifications of A3240ELT

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

Not 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

A3240ELT 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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