Field-Programmable, Chopper-Stabilized,

Unipolar Hall-Effect Switches

A3251

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

Selection Guide

Part Number

Package

(ºC)

Power-On

A3250ELT-T

Yes

Bulk, 500 pieces/bag

Surface mount

–40 to 85

High

Low

A3250ELTTR-T

Yes

7-in. reel, 1000 pieces/reel

A3250EUA-T

Yes

Bulk, 500 pieces/bag

SIP through hole

A3250LLT-T

Yes

Bulk, 500 pieces/bag

Surface mount

–40 to 150

High

Low

A3250LLTTR-T

Yes

7-in. reel, 1000 pieces/reel

A3250LUA-T

Yes

Bulk, 500 pieces/bag

SIP through hole

A3251ELT-T

Yes

Bulk, 500 pieces/bag

Surface mount

–40 to 85

Low

High

A3251ELTTR-T

Yes

7-in. reel, 1000 pieces/reel

A3251EUA-T

Yes

Bulk, 500 pieces/bag

SIP through hole

A3251LLT-T

Yes

Bulk, 500 pieces/bag

Surface mount

–40 to 150

Low

High

A3251LLTTR-T

Yes

7-in. reel, 1000 pieces/reel

A3251LUA-T

Yes

Bulk, 500 pieces/bag

SIP through hole

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: October 31, 2006. Deadlilne for receipt of LAST TIME BUY ORDERS: April

27, 2007. These variants include:

A3250ELT, A3250ELTTR, A3250EUA, A3251ELT, A3251ELTTR, A3251EUA, A3251LLT, A3251LLTTR, and

b. 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: A3250LLT, A3250LLTTR, A3250LUA.

the A3251 has the opposite polarity, switching HIGH in a south-

The other differences in the devices are the power-on state. The

A3250 powers-on in the HIGH state, while the A3251 powers-on

in the LOW state.

Three package styles provide a magnetically optimized package

for most applications. Type LT is a miniature SOT89/TO-243AA

surface mount package that is thermally enhanced with an

exposed ground tab, and type UA is a three-lead ultramini SIP

for through-hole mounting. The packages are lead (Pb) free, with

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

Description (continued)

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Supply Voltage

26.5

V

Reverse Supply Voltage

–18

V

Zener Overvoltage

30

V

Output Current

20

mA

Magnetic Flux Density

B

Unlimited

G

Operating Ambient Temperature

Range E

–40 to 85

ºC

Range L

–40 to 150

ºC

Maximum Junction Temperature

165

ºC

Storage Temperature

–65 to 170

ºC