A1140, A1141,
A1142, and A1143
Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Symbol
Test Conditions*
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.
2
of copper area each side
connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
Value Units
228
110
165
ºC/W
ºC/W
ºC/W
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
R
θJA
*Additional thermal information available on Allegro Web site.
Power Derating Curve
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
20
V
CC(max)
Maximum Allowable V
CC
(V)
2-layer PCB, Package LH
(R
θJA
= 110 ºC/W)
1-layer PCB, Package UA
(R
θJA
= 165 ºC/W)
1-layer PCB, Package LH
(R
θJA
= 228 ºC/W)
V
CC(min)
120
140
160
180
40
60
80
100
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
Power Dissipation, P
D
(m W)
2-
l
(R aye
rP
θ
J
C
A
=
11 B, P
0 º ac
1-la
C/ ka
W
(R yer PC
) ge L
θ
JA
=
B, P
H
165
a
ºC/ ckage
W)
UA
1-lay
er P
(R
CB,
θ
JA
=
228 Packag
ºC/W
e LH
)
40
60
80
100
120
Temperature (°C)
140
160
180
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
6
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
