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A3280LT Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3280LT
Beschreibung CHOPPER-STABILIZED/ PRECISION HALL-EFFECT LATCHES
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A3280LT Datasheet, Funktion
3280, 3281,
AND 3283
Suffix '–LT' & '–UA' Pinning
PTCT
V
CC
12
3
Dwg. PH-003-2
Pinning is shown viewed from branded side.
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are ex-
tremely temperature-stable and stress-resistant sensors 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.
The three devices are identical except for magnetic switch points.
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-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.
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -40°C to +85°C and
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a miniature
low-profile surface-mount package, ‘–LT’ is a miniature SOT-89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ........................ 26.5 V
Reverse Battery Voltage, VRCC .......... -30 V
Magnetic Flux Density, B ........... Unlimited
Output Off Voltage, VOUT ................... 26 V
Continuous Output Current,
IOUT ....................... Internally Limited
Reverse Output Current, IOUT ........ -50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, TJ ............... +170°C
Operating Temperature Range, TA
Suffix ‘E–’.................. -40°C to +85°C
Suffix ‘L–’................ -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
FEATURES
I Symmetrical Switch Points
I Resistant to Physical Stress
I Superior Temperature Stability
I Output Short-Circuit Protection
I Operation From Unregulated Supply
I Reverse Battery Protection
I Solid-State Reliability
I Small Size
Always order by complete part number: the prefix ‘A’ + the basic four-
digit part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3281ELH .






A3280LT Datasheet, Funktion
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
SENSOR LOCATIONS
(±0.005" [0.13 mm] die placement)
Package Designator ‘LH’
ACTIVE AREA DEPTH
0.011"
0.28 mm
NOM
0.059"
1.49 mm
3
0.038"
0.96 mm
A
1
2
Dwg. MH-025
Package Designator ‘LT’
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.088"
2.24 mm
0.045"
1.14 mm
A
12
3
Dwg. MH-008-8
Package Designators ‘UA’ and ‘UA-TL’
ACTIVE AREA DEPTH
0.018"
0.46 mm
NOM
0.080"
2.04 mm
0.056"
1.44 mm
A
BRANDED
SURFACE
1
2
3
Dwg. MH-011-9A
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage (cont’d)
OUTPUT SATURATION VOLTAGE
250
IOUT = 20 mA
TA = 150°C
TA = +25°C
TA = -40°C
225
200
175
150
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE IN VOLTS
24
Dwg. GH-055-1
SUPPLY CURRENT
8.0
OUTPUT ON
TA = 150°C
7.0 TA = +25°C
TA = -40°C
6.0
5.0
4.0
3.0
2.0
1.0
0
3.0 4.0
5.0 6.0 7.0 8.0 9.0 10
SUPPLY VOLTAGE IN VOLTS
Allegro
11 12
Dwg. GH-058-4
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









A3280LT pdf, datenblatt
3280, 3281, AND 3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
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;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
12 Worcester, Massachusetts 01615-0036 (508) 853-5000

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