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A3250LUATL Datasheet

  • A3250LUATL

  • Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect ...

  • 15頁

  • ALLEGRO   ALLEGRO

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A3250 and A3251
Field-Programmable, Chopper-Stabilized
Unipolar Hall-Effect Switches
The A3250 and A3251 are field-programmable, chopper-stabilized, unipolar Hall-
effect switches designed for use in high-temperature applications. These devices
use a chopper-stabilization technique to eliminate offset inherent in single-element
devices.
Package UA, 3-pin SIP
The A3250 and A3251 are externally programmable devices. The devices have a
wide range of programmability of the magnetic operate point (B
OP
) while the hys-
teresis remains fixed. This advanced feature allows for optimization of the sensor
switchpoint and can drastically reduce the effects of variations found in a produc-
tion 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 mag-
netic field with a flux density that exceeds the threshold for B
OP
, and switches
HIGH when the field drops below the magnetic release point, B
RP
. The output of
the A3251 has the opposite polarity, switching HIGH in a south-polarity magnetic
field that B
OP
, and switching LOW when the field drops below B
RP
.
The other differences in the devices are the power-on state. The A3250 powers-on
in the HIGH state, while the A3251 powers-on in the LOW state.
These devices are available in a TO-92 three-lead ultra-mini SIP (Single In-line
Package), with either straight or formed and trimmed lead configuration.
TL Option
1
2
3
1. VCC
2. GND
3. VOUT
Features and Benefits
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
......................................
26.5 V
Reverse-Supply Voltage, V
RCC
........................
鈥?8 V
Zener Overvoltage, V
Z
.......................................
30 V
Output Current, I
OUT
.........................................20
mA
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, T
A
, Range J.................
鈥?0潞C to 115潞C
Ambient, T
A
, Range L................
鈥?0潞C to 150潞C
Maximum Junction, T
J(max)
........................165潞C
Storage Temperature, T
S
..................
鈥?5潞C to 170潞C
Chopper stabilization for stable switchpoints
throughout operating temperature range
Externally programmable operate point
(through VCC pin)
On-board voltage regulator for 4.2 V to 24 V
operation
On-chip protection against:
Supply transients
Output short-circuits
Reverse-battery condition
Use the following complete part numbers when ordering:
Part Number
A3250JUA
A3250JUATL
A3250LUA
A3250LUATL
A3251JUA
A3251JUATL
A3251LUA
A3251LUATL
Package
Straight lead
Formed lead
Straight lead
Formed lead
Straight lead
Formed lead
Straight lead
Formed lead
T
A
(潞C)
鈥?0 to 115
鈥?0 to 150
鈥?0 to 115
鈥?0 to 150
V
OUT
B
hys(typ)
(G)
Power-On Running*
18
High
13
18
Low
13
High
Low
*In south polarity magnetic field of sufficient strength.
A3250-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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