3141.PDF

3141 THRU

SENSITIVE HALL-EFFECT SWITCHES

FOR HIGH-TEMPERATURE OPERATION

C, and are more stable with both

temperature and supply voltage changes. The unipolar switching

characteristic makes these devices ideal for use with a simple bar or rod

magnet. The four basic devices (3141, 3142, 3143, and 3144) are

identical except for magnetic switch points.

V CC

Each device includes a voltage regulator for operation with supply

voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic

Hall-voltage generator, temperature compensation circuitry, small-

signal amplifier, Schmitt trigger, and an open-collector output to sink

up to 25 mA. With suitable output pull up, they can be used with

bipolar or CMOS logic circuits. The A3141– and A3142– are im-

proved replacements for the UGN/UGS3140–; the A3144– is the

improved replacement for the UGN/UGS3120–.

C. Three

package styles provide a magnetically optimized package for most

applications. Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor

package for surface-mount applications; suffix ‘–UA’ is a three-lead

ultra-mini-SIP.

C to +85

C to +150

Dwg. PH-003A

Pinning is shown viewed from branded side.

FEATURES and BENEFITS

Supply Voltage, V CC ............................ 28 V

Reverse Battery Voltage, V RCC ........... -35 V

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

Output OFF Voltage, V OUT .................. 28 V

Reverse Output Voltage, V OUT ........... -0.5 V

Continuous Output Current, I OUT ...... 25 mA

Operating Temperature Range, T A

Suffix ‘E–’.................. -40

Superior Temp. Stability for Automotive or Industrial Applications

4.5 V to 24 V Operation … Needs Only An Unregulated Supply

Open-Collector 25 mA Output … Compatible with Digital Logic

Reverse Battery Protection

Activate with Small, Commercially Available Permanent Magnets

Solid-State Reliability

Small Size

Resistant to Physical Stress

C to +85

Suffix ‘L–’................ -40

C to +150

Storage Temperature Range,

T S .............................. -65

C to +170

Always order by complete part number, e.g., A3141ELT .

3144

These Hall-effect switches are monolithic integrated circuits with

tighter magnetic specifications, designed to operate continuously over

extended temperatures to +150

C. Suffix ‘L–’ is for the

automotive and military temperature range of -40

The first character of the part number suffix determines the device

operating temperature range. Suffix ‘E–’ is for the automotive and

industrial temperature range of -40

ABSOLUTE MAXIMUM RATINGS

at T A = +25

3141 THRU 3144

SENSITIVE

HALL-EFFECT SWITCHES

FOR HIGH-TEMP. OPERATION

FUNCTIONAL BLOCK DIAGRAM

V CC

REG.

OUTPUT

GROUND

Dwg. FH-005-2

ELECTRICAL CHARACTERISTICS at V CC = 8 V over operating temperature range.

Limits

Characteristic

Symbol

Test Conditions

Min. Typ. Max. Units

Supply Voltage

V CC

Operating

4.5 — 24

Output Saturation Voltage

V OUT(SAT)

I OUT = 20 mA, B > B OP

— 175 400 mV

Output Leakage Current

I OFF

V OUT = 24 V, B < B RP

— <1.0 10

µ A

Supply Current

I CC

B < B RP (Output OFF)

— 4.4 9.0 mA

Output Rise Time

t r

R L = 820 Ω

, C L = 20 pF

— 0.04 2.0

µ s

Output Fall Time

t f

R L = 820 Ω

, C L = 20 pF

— 0.18 2.0

µ s

MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.

Part Numbers*

A3141–

A3142–

A3143–

A3144–

Characteristic

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.

B OP at T A = 25 ° C

5010160 130180230 220280340 70 — 350

over operating temp. range

3010175 115 180245 25 280355 35 — 450

B RP at T A = 25 ° C

1045 130 75 125 175 165 225 285 50— 330

over operating temp. range

1045 145 60125 190 150225 30 25 — 430

B hys at T A = 25 ° C

2055 80 3055 80 3055 80 2055 —

over operating temp. range

2055 80 3055 80 3055 80 2055 —

NOTES: Typical values are at T A = +25° C and V CC = 8 V.

B OP = operate point (output turns ON); B RP = release point (output turns OFF); B hys = hysteresis (B OP - B RP ).

1 gauss (G) is exactly equal to 0.1 millitesla (mT).

*Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT or -UA).

115 Northeast Cutoff, Box 15036

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

3141 THRU 3144

SENSITIVE

HALL-EFFECT SWITCHES

FOR HIGH-TEMP. OPERATION

TYPICAL OPERATING CHARACTERISTICS

A3142– SWITCH POINTS

OUTPUT SATURATION VOLTAGE

400

300

V = 8 V

I = 20 mA

V = 4.5–24 V

300

200

OPERATE POINT

100

RELEASE POINT

100

150

-50

-25

100

125

150

-50

-25

100

125

AMBIENT TEMPERATURE IN

AMBIENT TEMPERATURE IN °°°

Dwg. GH-044

Dwg. GH-040-1

SUPPLY CURRENT

7.0

8.0

V = 8 V

B ≥

6.0

B ≥

6.0

B RP

4.0

5.0

2.0

T = +25

B ≤

B RP

4.0

-50

-25

100

125

150

SUPPLY VOLTAGE IN VOLTS

AMBIENT TEMPERATURE IN °°°

Dwg. GH-041-1

Dwg. GH-039-1

* Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).

www.allegromicro.com

OUT

3141 THRU 3144

SENSITIVE

HALL-EFFECT SWITCHES

FOR HIGH-TEMP. OPERATION

SENSOR LOCATIONS

TYPICAL OPERATING CHARACTERISTICS (cont.)

(

0.005” [0.13 mm] die placement)

Suffix “LT”

CHANGE IN OPERATE POINT

ACTIVE AREA DEPTH

0.0305"

0.775 mm

NOM

0.089"

2. 26 mm

0.043"

1.09 mm

T = +25

5.0

Dwg. MH-008-2D

Suffix “UA”

ACTIVE AREA DEPTH

-5.0

0.0195"

0.50 mm

NOM

0.082"

2.07 mm

SUPPLY VOLTAGE IN VOLTS

Allegro

Dwg. GH-042-1

0.055"

1.39 mm

OPERATION

The output of these devices (pin 3) switches low when the magnetic field

at the Hall sensor exceeds the operate point threshold (B OP ). At this point, the

output voltage is V OUT(SAT) . When the magnetic field is reduced to below the

release point threshold (B RP ), the device output goes high. The difference in

the magnetic operate and release points is called the hysteresis (B hys ) of the

device. This built-in hysteresis allows clean switching of the output even in

the presence of external mechanical vibration and electrical noise.

BRANDED

SURFACE

Dwg. MH-011-10A

Extensive applications information for Hall-effect sensors is available in:

• Hall-Effect IC Applications Guide , Application Note 27701;

• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead

Forming , Application Note 27703.1;

• Soldering of Through-Hole Hall-Sensor Dervices , Application Note 27703;

and

• Soldering of Surface-Mount Hall-Sensor Devices , Application Note 27703.2.

All are provided in Allegro Electronic Data Book , AMS-702. or at

www.allegromicro.com

115 Northeast Cutoff, Box 15036

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

3141 THRU 3144

SENSITIVE

HALL-EFFECT SWITCHES

FOR HIGH-TEMP. OPERATION

PACKAGE DESIGNATOR ‘LT’

(SOT89/TO-243AA)

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

0.181

0.173

0.063

0.055

4.60

4.40

1.83

1.62

1.60

1.40

0.0173

0.0138

0.072

0.064

0.44

0.35

0.167

0.155

0.102

0.090

0.084

4.25

3.94

2.60

2.29

2.13

0.047

0.035

0.0221

0.0173

0.0189

0.0142

1.20

0.89

0.56

0.44

0.48

0.36

0.059

BSC

1.50

BSC

0.118

BSC

3.00

BSC

Dwg. MA-009-3A in

Dwg. MA-009-3A mm

0.098

2.5

0.079

2.0

0.031

0.8

0.102

2.6

0.181

4.6

0. 0 47

1.2

0.028

TYP

0.031

TYP

0.7

TYP

0.8

TYP

Pads 1, 2, 3, and A — Standard SOT89 Layout

Pads 1, 2, 3, and B — Low-Stress Version

Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

Pads 1, 2, 3, and A — Standard SOT89 Layout

Pads 1, 2, 3, and B — Low-Stress Version

Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

Dwg. MA-012-3 in

Dwg. MA-012-3 mm

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.

2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.

3. Only low-temperature (

240

C) reflow-soldering techniques are recommended for SOT89 devices.

www.allegromicro.com

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