Two-Wire Chopper-Stabilized Hall Effect Latch
A1242
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; 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 LH, minimum-K PCB (single layer, single-sided with
copper limited to solder pads)
228  篊/W
Package LH, low-K PCB (single layer, double-sided with
0.926 in
2
 copper area)
110  篊/W
Package UA, minimum-K PCB (single layer, single-sided with
copper limited to solder pads)
165  篊/W
*Additional information available on the Allegro Web site.
Power Derating Curve
J(max)
 = 165癈; I
CC
 = I
CC(max)
2
3
4
5
6
7
8
9
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
em erature 癈
inimum-K PCB, Package UA
R
JA
 = 165 癈/W)
inimum-K PCB, Package LH
=   ?/DIV>
CCmax
ow-K PCB, Package LH
R  =11 ?W
Power Dissipation versus Ambient Temperature
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
emperature (癈)
ow-K PCB, Package LH
R
JA
 = 110 癈/W)
in-K PCB, Package LH
R  =22 ?W
in-K PCB, Package UA
R  =1  ?W
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