5

A1184-DS, Rev. 2

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch

A1184

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

connected by thermal vias

110

ºC/W

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

165

ºC/W

*Additional thermal information available on Allegro Web site.

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

165

ºC/

W)

1-laye

r PCB,

Packag

e UA

(R

8ºC/W

)

1-lay

erPCB,

Package

LH

(R

θJA

=

110

ºC/W)

2-layer

PCB,

Package

LH