Field-Programmable, Chopper-Stabilized,
Unipolar Hall-Effect Switches
A3250 and
A3251
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
Value  Units
Package Thermal Resistance
R
窲A
Package UA, 1-layer PCB with copper limited to solder pads   165   篊/W
Package LT, 1-layer PCB with copper limited to solder pads   180   篊/W
Package LT, 2-layer PCB with 0.94 in
2
copper each side
78   篊/W
6
7
8
9
2
3
4
5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
20   40   60   80   100   120   140   160   180
T 篊
Power Derating Curve
(R
窲A
= 165 篊/W)
1-layer PCB, Package UA
(R
窲A
= 180 篊/W)
1-layer PCB, Package LT
(R
窲A
= 78 篊/W)
2-layer PCB, Package LT
V
CC(min)
V
CC(max)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
20  40  60  80  100  120  140  160  180
Temperature (癈)
Power Dissipation
(
R
?/DIV>
JA
=
1
6
5
?/DIV>
C
/
W
)
1
-
l
a
y
e
r
P
C
B
,
P
a
c
k
a
g
e
U
A
(
R
?/DIV>
J
A
=
1
8
0
?/DIV>
C
/
W
)
1
-
l
a
y
e
r
P
C
B
,
P
a
c
k
a
g
e
L
T
(
R
?/DIV>
J
A
=
7
8
?/DIV>
C
/
W
)
2
-
l
a
y
e
r
P
C
B
,
P
a
c
k
a
g
e
L
T
B
HYS
V
OUT(off)
V
OUT(on)(sat)
B+
V+
Hysteresis of 擵
OUT
Switching Due to 擝
Hysteresis Curves
A3250
B
HYS
B+
V
OUT(off)
V
OUT(on)(sat)
V+
Hysteresis of 擵
OUT
Switching Due to 擝
A3251
Output voltage in relation to impinging magnetic flux density in a south polarity magnetic
field of sufficient strength. Transition through B
OP
must precede transition through B
RP
.
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