6

A1421-DS

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor

A1421, A1422, A1423

Characteristic

Symbol

Test Conditions*

Value

Units

Package Thermal Resistance

Minimum-K PCB (single-sided with copper limited to solder pads)

177

ºC/W

*In still air. Additional thermal information available on Allegro Web site.

20

40

60

80

100

120

140

160

180

Power Derating Curve

8

10

12

14

0

2

4

6

16

18

20

22

24

26

28

30

Minimum-K PCB

20

40

60

80

100

120

140

160

180

Temperature (°C)

(R

θJA

=

177

ºC/W)

Minimum-K

PCB

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

750

800

850

900

The following provide additional information about some of the

parameters cited. For additional information, visit the Allegro

Web site at www.allegromicro.com.

density, which is calculated as the arithmetic difference of the

the input signal frequency.

increasing differential magnetic flux density at which the device

output switches from low to high (A1421) or high to low (A1422

and A1423).

decreasing differential magnetic flux density at which the device

output switches from high to low (A1421) or from low to high

(A1422 and A1423).

power is applied, to initialize all circuitry necessary for proper

operation.

provide proper output transitions. Settling time is a function of

magnetic offset, offset polarity, signal phase, signal frequency,

and signal amplitude.

with the output transitor is turned on.

with the output transitor is turned off.

zero-crossing output transitions after initialization (the sum of

Power-on Time and Settling Time).

Definitions of Terms