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PDF A3121UA Data sheet ( Hoja de datos )

Número de pieza A3121UA
Descripción HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION
Fabricantes Allegro MicroSystems 
Logotipo Allegro MicroSystems Logotipo



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A3121, A3122, and A3133
Hall Effect Switches for High Temperature Operation
Discontinued Product
These parts are no longer in production The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: October 31, 2005
Recommended Substitutions:
For new customers and applications, refer to the A110x family.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a
product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information
included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor
for any infringements of patents or other rights of third parties which may result from its use.

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A3121UA pdf
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
ELEMENT LOCATIONS
(±0.005" [0.13 mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.089"
2.26 mm
A
0.043"
1.09 mm
12
3
Dwg. MH-008-2D
Suffix “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.082"
2.07 mm
A
BRANDED
SURFACE
1
2
0.055"
1.38 mm
3
Dwg. MH-011-2D
OPERATION
The output of these devices (pin 3) switches low when the mag-
netic field at the Hall element exceeds the operate point threshold (BOP).
At this point, the output voltage is V .OUT(SAT) When the magnetic field
is reduced to below the release point threshold (BRP), the device output
goes high. The difference in the magnetic operate and release points is
called the hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external mechani-
cal vibration and electrical noise.
APPLICATIONS INFORMATION
Extensive applications information for Hall-effect devices is
available in:
Hall-Effect IC Applications Guide, Application Note 27701;
Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and
Lead Forming, Application Note 27703.1;
Soldering of Through-Hole Hall-Sensor Dervices, Application Note
27703; and
Soldering of Surface-Mount Hall-Sensor Devices, Application Note
27703.2.
All are provided in Allegro Electronic Data Book, AMS-702. or at
www.allegromicro.com
Allegro
CHANGE IN OPERATE POINT
20
15
TA = +25°C
10
5.0
0
-5.0
0
5 10 15
SUPPLY VOLTAGE IN VOLTS
20 25
Dwg. GH-042
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000

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