A3250LUA-T Allegro Microsystems Inc, A3250LUA-T Datasheet - Page 2
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A3250LUA-T
Manufacturer Part Number
A3250LUA-T
Description
IC SW HALL EFFECT UNI 3-SIP
Manufacturer
Allegro Microsystems Inc
Type
Unipolar Switchr
Datasheet
1.A3251EUA-T.pdf
(16 pages)
Specifications of A3250LUA-T
Sensing Range
50G
Voltage - Supply
4.2 V ~ 24 V
Current - Supply
10mA
Current - Output (max)
20mA
Output Type
Digital, Open Collector
Features
Regulated Voltage
Operating Temperature
-40°C ~ 150°C
Package / Case
3-SIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features and Benefits
▪ Chopper stabilization for stable switchpoints throughout
▪ Externally programmable operate point (through VCC pin)
▪ On-board voltage regulator for 4.2 V to 24 V operation
▪ On-chip protection against:
Package: 3-pin SOT89 (suffix LT) and
3-pin SIP (suffix UA)
Not to scale
3250-DS Rev. 11
operating temperature range
▫ Supply transients
▫ Output short-circuits
▫ Reverse-battery condition
VCC
Amp
Field-Programmable, Chopper-Stabilized
Functional Block Diagram
Program/Lock
Programming
Logic
Low-Pass
Filter
Offset Adjust
Unipolar Hall-Effect Switches
Description
The A3250 and A3251 are field-programmable, chopper-
stabilized, unipolar Hall-effect switches designed for use in
high-temperature applications. These devices use a chop-
per-stabilization technique to eliminate offset inherent in
single-element devices.
The A3250 and A3251 are externally programmable
devices. The devices have a wide range of programmabil-
ity of the magnetic operate point (B
remains fixed. This advanced feature allows for optimiza-
tion of the device switchpoint and can drastically reduce
the effects of variations found in a production environment,
such as magnet and device placement tolerances.
These devices provide on-chip transient protection. A Zener
clamp on the power supply protects against overvoltage
conditions on the supply line. These devices also include
short-circuit protection on the output.
The output of the A3250 switches LOW when subjected
to a south-polarity magnetic field with a flux density that
exceeds the threshold for B
field drops below the magnetic release point, B
put of the A3251 has the opposite polarity, switching HIGH
in a south-polarity magnetic field that B
LOW when the field drops below B
Continued on the next page…
Current Limit
Regulator
A3250 and A3251
OP
GND
, and switches HIGH when the
OP
RP
) while the hysteresis
.
VOUT
OP
, and switching
RP
. The out-