A3281LLT Allegro Microsystems Inc, A3281LLT Datasheet

A3281LLT

Manufacturer Part Number

A3281LLT

Description

Manufacturer

Allegro Microsystems Inc

Datasheet

1.A3281LLT.pdf (12 pages)

Specifications of A3281LLT

Magnetic Type

Latch

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)

90Gs

Mag Sensor Release Point (g)

-90Gs

Mag Sensor Hysteresis(g)

100Gs

Package Type

SOT-89

Pin Count

3 +Tab

Mounting

Surface Mount

Operating Temp Range

-40C to 150C

Operating Temperature Classification

Automotive

Lead Free Status / RoHS Status

Not Compliant

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Features and Benefits

▪ Symmetrical switch points

▪ 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:

Not to scale

27609.20-DS, Rev. H

Package LT

Package LH

Package UA

Functional Block Diagram

Chopper-Stabilized, Precision

Description

The A3280, A3281, and A3283 Hall-effect latches are

ex treme ly temperature-stable and stress-resistant sensors

especially suited for operation over extended temperature

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, temperature dependencies, and

thermal stress. The three devices are iden ti cal except for

mag net ic switch points.

Each 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. A north pole is necessary to turn the output off. 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. Each package

type is lead (Pb) free (suffix, –T), with 100% matte tin

leadframe plating.

A3280, A3281, and A3283

Hall-Ef fect Latches

Related parts for A3281LLT

A3281LLT Summary of contents

Page 1

Features and Benefits ▪ Symmetrical switch points ▪ 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: Package LH Package ...

Page 2

... A3281ELHLT-T 7-in. reel, 3000 pieces/reel A3281EUA-T Bulk, 500 pieces/bag 3 A3281LLHLT-T 7-in. reel, 3000 pieces/reel A3281LLT-T Bulk, 500 pieces/bag 2 A3281LLTTR-T 7-in. reel, 1000 pieces/reel A3281LUA-T Bulk, 500 pieces/bag A3283ELHLT-T 7-in. reel, 3000 pieces/reel 3 A3283ELTTR-T 7-in. reel, 1000 pieces/reel A3283EUA-T Bulk, 500 pieces/bag A3283LLHLT-T 7-in ...

Page 3

A3280, A3281 A3283 and X PTCT Suffix '–LT' & '–UA' Pinning (SOT89/TO-243AA & ultra-mini SIP) Chopper-Stabilized, Precision 3 Dwg. PH-003-2 Hall-Effect Latches Sufﬁ x ‘–LH’ Pinning (SOT23W) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 ...

Page 4

A3280, A3281 A3283 and 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 ...

Page 5

A3280, A3281 A3283 and TYPICAL OPERATING CHARACTERISTICS Chopper-Stabilized, Precision as a function of temperature Hall-Effect Latches Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 ...

Page 6

A3280, A3281 A3283 and OUTPUT SATURATION VOLTAGE 300 OUT 200 100 0 -50 - AMBIENT TEMPERATURE IN °C TYPICAL OPERATING CHARACTERISTICS A3280* SWITCH POINTS 40 OPERATE POINT 20 ...

Page 7

A3280, A3281 A3283 and TYPICAL OPERATING CHARACTERISTICS Chopper-Stabilized, Precision as a function of supply voltage (cont’d) OUTPUT SATURATION VOLTAGE 250 225 200 175 150 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE IN VOLTS SUPPLY CURRENT 8.0 7.0 6.0 5.0 4.0 3.0 ...

Page 8

A3280, A3281 A3283 and 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 ...

Page 9

A3280, A3281 A3283 and be con nect ed (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-sta tion tech nique. ...

Page 10

A3280, A3281 A3283 and +0.12 2.98 –0.08 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 ...

Page 11

A3280, A3281 A3283 and +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 lead ...

Page 12

A3280, A3281 A3283 and 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 ©2002-2008, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: ...

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