Type UGN3275K latching Hall-effect sensors are bipolar inte-

grated circuits designed for electronic commutation of brushless dc
motors. They feature dual complementary outputs. The latches are
typically used to sense matched magnetic flux densities of alternating
polarity from multipole ring magnets.

Each sensor IC includes a Hall voltage generator, operational

amplifier, Schmitt trigger, voltage regulator, and dual bipolar output
transistors. The regulator allows use of the integrated circuit with
supply voltages of 4.5 V to 24 V.

If the Hall cell is exposed to a magnetic flux density greater than

the operate threshold (B

), OUTPUT goes low (turns on) and

OUTPUT goes high (turns off). The outputs will hold (latch) this state
until magnetic field reversal exposes the Hall cell to a magnetic flux
density below the release threshold (B

) when OUTPUT will go high

(off) and OUTPUT will go low (on). This state is also latched. Under
any condition one output is on while the other is off. Because the
operating state switches only with magnetic field reversal, and not
merely with a change in the strength, these integrated circuits qualify
as true Hall-effect latches.

These complementary-output Hall-effect latches are supplied in a

four-pin plastic SIP, 0.200" (5.08 mm) wide, 0.130" (3.3 mm) high, and
0.060" (1.54 mm) thick.

FEATURES

Operable with Multipole Ring Magnets

High Reliability

Small Size

Output Compatible with All Digital Logic Families

4.5 V to 24 V Operation

High Hysteresis Level Minimizes Stray-Field Problems

Complementary Outputs

Always order by complete part number:

UGN3275K .

Dwg. PH-002

SUPPLY

GROUND

OUTPUT

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

Power Supply, V

. . . . . . . . . . . . . . . . 25 V

Magnetic Flux Density, B . . . . . . Unlimited

Output OFF Voltage, V

OUT

. . . . . . . . . . 25 V

Output ON Current, I

OUT

. . . . . . . . . . 50 mA

Operating Temperature Range,

. . . . . . . . . . . . . . . . . -20

C to +85

Storage Temperature Range,

. . . . . . . . . . . . . . . . -65

C to +150

COMPLEMENTARY-OUTPUT

HALL-EFFECT LATCH

3275

Data Sheet

27632.2

3275

COMPLEMENTARY-OUTPUT

HALL-EFFECT LATCH

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

SENSOR LOCATION

FUNCTIONAL BLOCK DIAGRAM

Dwg. FH-002

GROUND

OUTPUT

REG.

Dwg. MH-001-2A

0.015"
0.38 mm
NOM

0.047"

1.21 mm

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.096"

2.44 mm

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage

Operating

4.5

Output Saturation Voltage

OUT(SAT)

= 4.5 V, I

OUT

= 20 mA, B > B

400

Output Leakage Current

OFF

OUT

= 24 V, V

= 24 V, B < B

Supply Current

= 24 V, B < B

7.0

Output Rise Time

= 12 V, R

= 820

, C

= 20 pF

0.04

0.4

Output Fall Time

= 12 V, R

= 820

, C

= 20 pF

0.18

0.4

ELECTRICAL CHARACTERISTICS at T

= +25

C, V

= 4.5 V to 24 V

(unless otherwise noted).

MAGNETIC CHARACTERISTICS

= +25

= -20

C to +85

Characteristic

Symbol

Min.

Max.

Min.

Max.

Units

Operate Point

250

Release Point

-250

-25

-250

-15

Hysteresis

hys

100

NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention).

3275

COMPLEMENTARY-OUTPUT

HALL-EFFECT LATCH

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

Dwg. MH-009D in

0.063
0.059

0.033

0.0173
0.0138

0.0189
0.0142

0.050

BSC

SEE NOTE

0.208
0.203

0.138
0.133

0.600
0.560

0.085

MAX

Dwg. MH-009D mm

1.60
1.50

0.84

0.44
0.35

0.48
0.36

1.27

BSC

SEE NOTE

5.28
5.16

3.51
3.38

15.24
14.23

2.16

MAX

NOTES: 1. Tolerances on package height and width represent allowable mold offsets.

Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor's option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.

The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;

5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to

permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify
that the information being relied upon is current.

Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written

approval.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its

use; nor for any infringements of patents or other rights of third parties that may result from its use.

3275

COMPLEMENTARY-OUTPUT

HALL-EFFECT LATCH

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

HALL-EFFECT SENSORS

Partial Part

Avail. Oper.

Characteristics at TA = +25

Number

Temp.

BOP(max)

BRP(min)

Bhys(typ)

Features

Notes

HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys

3240

E/L

+50

+5.0

chopper stabilized

3210

5.0

7.7

micropower, chopper stabilized

3361

+55*

+110

5.0*

2-wire, chopper stabilized

3362

+110

+55

5.0*

2-wire, chopper stabilized

3161

+160

+30

2-wire

3141

E/L

+160

+10

3235

+175

+25

15*

output 1

-25

-175

15*

output 2

5140

+200

+50

300 mA output

1, 3

3142

E/L

+230

+75

3143

E/L

+340

+165

3144

E/L

+350

+50

3122

E/L

+400

+140

105

3123

E/L

+440

+180

105

3121

E/L

+450

+125

105

3150

+40 to +850

programmable, chopper stabilized

HALL-EFFECT LATCHES & BIPOLAR SWITCHES

in order of BOP and Bhys

3260

E/L

+30

-30

bipolar, chopper stabilized

3280

E/L

+40

-40

chopper stabilized

3134

E/L

+50

-50

bipolar switch

3133

K/L/S

+75

-75

bipolar switch

3281E/L

+90

-90

chopper stabilized

3132

K/L/S

+95

-95

bipolar switch

3187

E/L

+150

-150

100*

3177

+150

-150

200

3625

+150

-150

200

900 mA outputs

1, 3, 5

3626

+150

-150

200

400 mA outputs

1, 3, 5

3195

E/L

+160

-160

220

1, 4

3197

+160

-160

230

3175

+170

-170

200

3188

E/L

+180

-180

200*

3283

E/L

+180

-180

300

chopper stabilized

3189

E/L

+230

-230

100*

3275

+250

-250

100*

3185

E/L

+270

-270

340*

Operating Temperature Ranges:

S = -20

C to +85

C, E = -40

C to +85

C, J = -40

C to +115

C, K = -40

C to +125

C, L = -40

C to +150

Notes 1. Protected.

2. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc
motor control.
3. Power driver output.
4. Active pull down.
5. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control.

* Minimum. Maximum
Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal

for reliable operation over operating temperature range.

Part Number 3275