A1221ELHLT-T Allegro Microsystems Inc, A1221ELHLT-T Datasheet

IC LATCH BIPOLAR 3V SOT-23W

A1221ELHLT-T

Manufacturer Part Number
A1221ELHLT-T
Description
IC LATCH BIPOLAR 3V SOT-23W
Manufacturer
Allegro Microsystems Inc
Type
Bipolar Latchr
Datasheet

Specifications of A1221ELHLT-T

Sensing Range
90G Trip, -90G Release
Voltage - Supply
3 V ~ 24 V
Current - Supply
4mA
Current - Output (max)
25mA
Output Type
Digital, Open Drain
Features
Regulated Voltage
Operating Temperature
-40°C ~ 85°C
Package / Case
SOT-23W
Termination Type
SMD
No. Of Pins
3
Release Point Max
-15G
Hall Effect Type
Latching
Operating Temperature Range
-40°C To +85°C
Supply Voltage Min
3V
Release Point Min
-90G
Filter Terminals
SMD
Rohs Compliant
Yes
Bandwidth
800kHz
Leaded Process Compatible
Yes
Operate Point Max
90G
Operate Point Min
15G
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
620-1279-2
Features and Benefits
▪ Symmetrical latch switchpoints
▪ Resistant to physical stress
▪ Superior temperature stability
▪ Output short-circuit protection
▪ Operation from unregulated supply down to 3 V
▪ Reverse battery protection
▪ Solid-state reliability
▪ Small package sizes
Packages:
A1220-DS, Rev. 11
3-pin SOT23W (suffix LH)
Not to scale
VCC
Chopper Stabilized Precision Hall Effect Latches
3-pin SIP (suffix UA)
Amp
Functional Block Diagram
Low-Pass
Filter
A1220, A1221, A1222, and A1223
Description
The A1220, A1221, A1222, and A1223 Hall-effect sensor ICs
are extremely temperature-stable and stress-resistant devices
especially suited for operation over extended temperature ranges
to 150°C. Superior high-temperature performance is made
possible through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding,
temperature dependencies, and thermal stress. Each device
includes on a single silicon chip a voltage regulator, Hall-
voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a short-circuit protected open-drain output
to sink up to 25 mA. A south pole of sufficient strength turns
the output on. A north pole of sufficient strength is necessary
to turn the output off.
An onboard regulator permits operation with supply voltages
of 3 to 24 V. The advantage of operating down to 3 V is that
the device can be used in 3-V applications or with additional
external resistance in series with the supply pin for greater
protection against high voltage transient events.
Two package styles provide magnetically optimized packages
for most applications. Package type LH is a modified 3-pin
SOT23W surface mount package while UA is a three-pin ultra-
mini SIP for through hole mounting. Both packages are lead
(Pb) free, with 100% matte tin plated leadframes.
Regulator
To All Subcircuits
Current Limit
Control
GND
VOUT

Related parts for A1221ELHLT-T

A1221ELHLT-T Summary of contents

Page 1

Chopper Stabilized Precision Hall Effect Latches Features and Benefits ▪ Symmetrical latch switchpoints ▪ Resistant to physical stress ▪ Superior temperature stability ▪ Output short-circuit protection ▪ Operation from unregulated supply down ▪ Reverse battery protection ▪ ...

Page 2

... Bulk, 500 pieces/bag A1220LLHLX-T 13-in. reel, 10000 pieces/reel 2 A1220LLHLT-T 7-in. reel, 3000 pieces/reel A1220LUA-T Bulk, 500 pieces/bag A1221ELHLX-T 13-in. reel, 10000 pieces/reel A1221ELHLT-T 2 7-in. reel, 3000 pieces/reel A1221EUA-T Bulk, 500 pieces/bag A1221LLHLX-T 13-in. reel, 10000 pieces/reel A1221LLHLT-T 2 7-in. reel, 3000 pieces/reel ...

Page 3

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Absolute Maximum Ratings Characteristic Forward Supply Voltage Reverse Supply Voltage Output Off Voltage Continuous Output Current Reverse Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature 3 Package ...

Page 4

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 ELECTRICAL CHARACTERISTICS Characteristics Electrical Characteristics Forward Supply Voltage Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time 3 Chopping Frequency Output Rise Time 3,4 Output Fall Time ...

Page 5

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance Symbol Package LH, 1-layer PCB with copper limited to solder pads Package LH, 2-layer ...

Page 6

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 A1220, A1221, A1222, and A1223 Electrical Characteristics Average Supply Current (On) versus Temperature 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 ...

Page 7

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Operate Point versus Temperature -60 -40 - (°C) A Release Point versus Temperature 0 ...

Page 8

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Operate Point versus Temperature -60 -40 - (°C) A Release Point versus Temperature ...

Page 9

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Operate Point versus Temperature 150 140 130 120 110 100 -60 -40 - (°C) A Release Point versus Temperature -70 ...

Page 10

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Operation The output of these devices switches low (turns on) when a mag- netic field perpendicular to the Hall element exceeds the operate point threshold, B (see panel A ...

Page 11

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Chopper Stabilization Technique When using Hall effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small ...

Page 12

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating ...

Page 13

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 +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 ...

Page 14

A1220, A1221, Chopper Stabilized Precision Hall Effect Latches A1222, and A1223 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2009-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from ...

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