Allegro A3144LLT, A3144EUA, A3144EU, A3144ELT, A3143LUA Datasheet

Data Sheet

27621.6A

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

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25°C

Supply Voltage, VCC............................ 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°C to +85°C

Suffix ‘L–’ ................ -40°C to +150°C

Storage Temperature Range,

TS.............................. -65°C to +170°C

These Hall-effect switches are monolithic integrated circuits with
tighter magnetic specifications, designed to operate continuously over
extended temperatures to +150°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.

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, small­signal 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 im­proved replacements for the UGN/UGS3140–; the A3144– is the
improved replacement for the UGN/UGS3120–.

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°C to +85°C. Suffix ‘L–’ is for the
automotive and military temperature range of -40°C to +150°C. Three
package styles provide a magnetically optimized package for most
applications. Suffix ‘–LT’ is a miniature SOT-89/TO-243AA transis­tor package for surface-mount applications; suffix ‘–U’ is a three-lead
plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-mini-SIP.

FEATURES and BENEFITS

■ 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

Pinning is shown viewed from branded side.

SENSITIVE HALL-EFFECT SWITCHES

FOR HIGH-TEMPERATURE OPERATION

3141

THRU

3144

Dwg. PH-003A

1

SUPPLY

V

CC

GROUND

32

OUTPUT

X

3141

THRU

3144

SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

FUNCTIONAL BLOCK DIAGRAM

V

CC

X

REG.

Dwg. FH-005-2

GROUND

OUTPUT

3

2

1

MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.

NOTES: Typical values are at TA = +25°C and VCC = 8 V.

BOP = operate point (output turns ON); BRP = release point (output turns OFF); B

hys

= hysteresis (BOP - BRP).

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

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 V

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 µA

Supply Current I

CC

B < BRP (Output OFF) — 4.4 9.0 mA

Output Rise Time t

r

RL = 820 Ω, CL = 20 pF — 0.04 2.0 µs

Output Fall Time t

f

RL = 820 Ω, CL = 20 pF — 0.18 2.0 µs

Part Numbers*

A3141– A3142– A3143– A3144–

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

B

OP

at TA = 25°C 50 100 160 130 180 230 220 280 340 70 — 350

over operating temp. range 30 100 175 115 180 245 205 280 355 35 — 450

B

RP

at TA = 25°C 10 45 130 75 125 175 165 225 285 50 — 330

over operating temp. range 10 45 145 60 125 190 150 225 300 25 — 430

B

hys

at TA = 25°C 20 55 80 30 55 80 30 55 80 20 55 —

over operating temp. range 20 55 80 30 55 80 30 55 80 20 55 —

Copyright © 1993, 1999, Allegro MicroSystems, Inc.

3141

THRU

3144

SENSITIVE

HALL-EFFECT SWITCHES

FOR HIGH-TEMP. OPERATION

SUPPLY CURRENT

SUPPLY CURRENT

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

0

Dwg. GH-041-1

5

SUPPLY CURRENT IN mA

0

2.0

4.0

6.0

8.0

10

B ≥ B

OP

B ≤ B

RP

T = +25°C

A

0 25 50 75

100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-039-1

125

-25

V = 8

V

CC

SUPPLY CURRENT IN mA

7.0

6.0

5.0

4.0

150

B ≤ B

RP

B ≥ B

OP

TYPICAL OPERATING CHARACTERISTICS

A3142– SWITCH POINTS OUTPUT SATURATION VOLTAGE

0 25 50 75

100

300

0

AMBIENT TEMPERATURE IN °C

200

100

-50

Dwg. GH-040-1

SATURATION VOLTAGE IN mV

150

-25

125

I = 20 mA

V = 4.5–24 V

OUT

CC

0 50 100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-044

SWITCH POINT IN GAUSS

300

400

200

100

OPERATE POINT

RELEASE POINT

V = 8 V

CC

150

0

-25 25 75 125

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