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A1185

Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches

Allegro MicroSystems 

A1185 and

A1186

Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

Description (continued)

Additionally, the system designer gains inherent diagnostics

because output current normally flows in either of two narrowly-

specified ranges. This provides distinct current ranges for IOUT(H)

and IOUT(L). Any output current level outside of these two ranges

is a fault condition.

Other features of the A1185 and A1186 devices include on-chip

transient protection and a Zener clamp on the power supply to protect

against overvoltage conditions on the supply line.

The output current of the A1186 switches HIGH in the presence of

a south polarity magnetic field of sufficient strength; and switches

LOW otherwise, including when there is no significant magnetic field

present. The A1185 has an inverted output current level: switching

LOW in the presence of a south polarity magnetic field of sufficient

strength, and HIGH otherwise.

Both devices are offered in two package styles: LH, a SOT-23W

miniature low-profile package for surface-mount applications, and

UA, a three-lead ultramini Single Inline Package (SIP) for through-

hole mounting. Each package is available in a lead (Pb) free version

(suffix, –T) with 100% matte tin plated leadframe.

Factory-programmed versions are also available. Refer to: A1145

and A1146.

Selection Guide

Part Number

Pb-free1

Packing2

Mounting

Ambient, TA

(°C)

Output

South (+) Field3

Supply Current at Low

Output, ICC(L)

(mA)

A1185ELHLT-T

Yes

A1185EUA-T

Yes

A1185LLHLT-T

Yes

A1185LUA-T

Yes

A1186ELHLT-T

Yes

A1186EUA-T

Yes

A1186LLHLT-T

Yes

A1186LUA-T

Yes

7-in. reel, 3000 pieces/reel

Bulk, 500 pieces/bag

7-in. reel, 3000 pieces/reel

Bulk, 500 pieces/bag

7-in. reel, 3000 pieces/reel

Bulk, 500 pieces/bag

7-in. reel, 3000 pieces/reel

Bulk, 500 pieces/bag

Surface mount

4-pin SIP through hole

Surface mount

4-pin SIP through hole

Surface mount

4-pin SIP through hole

Surface mount

4-pin SIP through hole

–40 to 85

–40 to 150

–40 to 85

–40 to 150

Low

High

5 to 6.9

1Pb-based variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW

DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design

applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1185ELHLT,

A1185EUA, A1185LLHLT, A1185LUA, A1186ELHLT, A1186EUA, A1186LLHLT, and A1186LUA.

2Contact Allegro for additional packing options.

3South (+) magnetic fields must be of sufficient strength.

Absolute Maximum Ratings

Characteristic

Supply Voltage

Reverse Supply Voltage

Magnetic Flux Density

Operating Ambient Temperature

Maximum Junction Temperature

Storage Temperature

Symbol

VCC

VRCC

B

TA

TJ(max)

Tstg

Range E

Range L

Notes

Rating

28

–18

Unlimited

–40 to 85

–40 to 150

165

–65 to 170

Units

V

V

G

ºC

ºC

ºC

ºC

Allegro MicroSystems, Inc.

2

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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