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

Temperature (ºC)

Power Derating Curve

1-layer PCB, Package LH

2-layer PCB, Package LH

1-layer PCB, Package UA

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

ºC/W)

1-lay

er PC

B, Packa

ge

UA

(R

ºC/W

)

1-lay

er PCB,

Package

LH

(R

θJ

A

= 110

ºC/

W)

2-l

ayer

PCB,

Packag

e LH

Characteristic

Symbol

Test Conditions*

Value

Unit

Package Thermal Resistance

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

228

ºC/W

110

ºC/W

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

165

ºC/W

*Additional thermal information available on the Allegro website

Chopper-Stabilized, Two Wire

Hall-Effect Switches

A1150, A1152, A1153, A1155,

A1156, A1157, and A1158

4

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com