Chopper Stabilized Precision Hall Effect Switches

A1120, A1121

and A1125

5

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

Package LH, 1-layer PCB with copper limited to solder pads

228

ºC/W

side connected by thermal vias

110

ºC/W

Package UA, 1-layer PCB with copper limited to solder pads

165

ºC/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

Power Derating Curve

Package LH, 1-layer PCB

Package LH, 2-layer PCB

Package UA, 1-layer PCB

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 (°C)

Power Dissipation versus Ambient Temperature

(R

JA

= 165

ºC/W)

Package

UA,

1-layer

PCB

(R

JA

= 228

ºC/W)

Package

LH,

1-layer

PCB

(R

ºC/W)

Package

LH,

2-layer

PCB