Datasheet A3134LUA, A3134LU, A3134LLT, A3134EUA, A3134EU Datasheet (Allegro)

Always order by complete part number, e.g., A3134ELT .

FEATURES

■ Superior Temperature Stability

■ Operation From Unregulated Supply

■ Open-Collector 25 mA Output

■ Reverse Battery Protection

■ Activate With Small, Commercially Available Permanent Magnets

■ Solid-State Reliability

■ Small Size

■ Resistant to Physical Stress

This low-hysteresis bipolar Hall-effect switch is an extremely
temperature-stable and stress-resistant sensor especially suited for
operation over extended temperature ranges to +150°C. Superior
high-temperature performance is made possible through a novel Schmitt
trigger circuit that maintains operate and release point stability by
compensating for temperature changes in the Hall element. Additionally,
internal compensation provides magnetic switch points that become more
sensitive with temperature, hence offsetting the usual degradation of the
magnetic field with temperature. Its low hysteresis makes this device
ideal for detecting small changes in magnetic field strength or for use
with inexpensive magnets.

The device includes on a single silicon chip a voltage regulator,
quadratic Hall-voltage generator, temperature compensation circuit,
signal amplifier, Schmitt trigger, and a buffered open-collector output to
sink up to 25 mA. The on-board regulator permits operation with supply
voltages of 3.8 volts to 24 volts.

The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and
suffix ‘L–’ is -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.

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Supply Voltage, VCC............................. 30 V

Reverse Battery Voltage, V

RCC

.......... -30 V

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

Output OFF Voltage, V

OUT

.................. 30 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

Data Sheet

27631.4B

3134

BIPOLAR HALL-EFFECT SWITCH

FOR HIGH-TEMPERATURE OPERATION

Dwg. PH-003A

1

SUPPLY

V

CC

GROUND

32

OUTPUT

X

3134

LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION

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

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

CC

Operating 3.8 — 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

— 0.05 1.0 µA

Supply Current I

CC

B < BRP (Output OFF) — 3.2 9.0 mA

B > BOP (Output ON) — 5.0 — mA

Output Rise Time t

r

RL = 820 Ω, CL = 20 pF — 100 — ns

Output Fall Time t

f

RL = 820 Ω, CL = 20 pF — 100 — ns

ELECTRICAL CHARACTERISTICS over operating temperature range, at V

CC

= 12 V.

MAGNETIC CHARACTERISTICS over operating supply voltage range.

V

CC

X

REG.

Dwg. FH-005-3

GROUND

OUTPUT

1

3

2

FUNCTIONAL BLOCK DIAGRAM

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Operate Point B

OP

at TA = +25°C-408.550G

Over Oper. Temp. Range -40 – 50 G

Release Point B

RP

at TA = +25°C-50-1940G

Over Oper. Temp. Range -50 – 40 G

Hysteresis B

hys

at TA = +25°C 102750 G

Over Oper. Temp. Range 5.0 – 55 G

Copyright © 1995, 1999, Allegro MicroSystems, Inc.

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

hys

= hysteresis (BOP - BRP).
As used here, negative flux densities are defined as less than zero (algebraic convention).
Typical values are at TA = +25°C and VCC = 12 V.

3134

LOW-HYSTERESIS

BIPOLAR HALL-EFFECT SWITCH

FOR HIGH-TEMP. OPERATION

TYPICAL OPERATING CHARACTERISTICS

0 25 50 75

100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-053

125-25

SUPPLY CURRENT IN mA

5.0

4.0

3.0

2.0

1.0
150

V = 12 V

CC

B < B

RP

V = 24 V

CC

V = 4.5 V

CC

OUTPUT SATURATION VOLTAGE SUPPLY CURRENT

0 25 50 75

100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-052

125-25

SWITCH POINT IN GAUSS

40

20

0

-20

-40

RELEASE POINT

OPERATE POINT

150

CC

V = 4.5 V–24 V

SWITCH POINTS HYSTERESIS

0 25 50 75

100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-051

125-25

HYSTERESIS IN GAUSS

20

10

0

150

30

CC

V = 4.5 V–24 V

40

50

0255075

100

300

0

AMBIENT TEMPERATURE IN °C

200

100

-50

Dwg. GH-029

SATURATION VOLTAGE IN mV

150

-25

125

I = 20 mA

V = 4.5–24 V

OUT

CC

3134

LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION

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

APPLICATIONS INFORMATION

Hall effect applications information is available in the “Hall-Effect IC
Applications Guide” (AN 27701), which can be found in the latest issue of
Allegro MicroSystems Electronic Data Book, AMS-702, or at

www.allegromicro.com

OPERATION

The output of these devices (pin 3) switches low when the magnetic field
at the Hall sensor exceeds the operate point threshold (BOP). At this point, the
output voltage is V

OUT(SAT)

. When the magnetic field is reduced to below the
release point (BRP) the device output goes high. Note especially that release
can occur when the magnetic field is removed but to ensure release, a field
reversal is required. 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.

Suffix “UA”

SENSOR LOCATIONS

(±0.005" [0.13 mm] die placement)

1 32

Dwg. MH-011-4B

0.018"

0.46 mm
NOM

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.083"

2.10 mm

0.060"

1.51 mm

A

Suffix “U”

1 32

Dwg. MH-002-7B

0.015"

0.38 mm
NOM

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.077"

1.96 mm

0.092"

2.33 mm

A

Suffix “LT”

1 32

Dwg. MH-008-4B

0.030"

0.76 mm
NOM

ACTIVE AREA DEPTH

0.050"

1.27 mm

0.090"

2.27 mm

A

3134

LOW-HYSTERESIS

BIPOLAR HALL-EFFECT SWITCH

FOR HIGH-TEMP. OPERATION

Dimensions in Millimeters

(controlling dimensions)

Dwg. MA-009-3 in

1

23

0.064

0.072

0.155

0.167

0.059

BSC

0.014

0.019

0.035

0.047

0.090

0.102

0.055

0.063

0.014

0.017

0.084

0.090

0.017

0.022

0.118

BSC

0.173

0.181

PACKAGE DESIGNATOR ‘LT’

(SOT-89/TO-243AA)

Dimensions in Inches

(for reference only)

Dwg. MA-009-3 mm

1

23

4.40

4.60

1.62

1.83

3.94

4.25

1.50

BSC

0.36

0.48

0.89

1.20

2.29

2.60

1.40

1.60

0.35

0.44

2.13

2.29

0.44

0.56

3.00

BSC

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.

3134

LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION

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

Dwg. MH-003D mm

1.60

1.50

0.46

0.38

0.41

1.27

1 2 3

2.54

45°

SEE NOTE

4.65

4.52

4.60

4.47

15.24

14.23

2.18

MAX

Dwg. MH-003D in

0.063

0.059

0.018

0.015

0.016

0.050

1 2 3

0.100

45°

SEE NOTE

0.183

0.178

0.181

0.176

0.600

0.560

0.086

MAX

PACKAGE DESIGNATOR ‘U’

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

Devices in the ‘U’ package are

NOT RECOMMENDED FOR NEW DESIGN

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.

3134

LOW-HYSTERESIS

BIPOLAR HALL-EFFECT SWITCH

FOR HIGH-TEMP. OPERATION

Dwg. MH-014D in

0.164

0.159

0.062

0.058

0.015

0.050

BSC

45°

0.640

0.600

0.016

0.085

MAX

45°

0.031

123

0.122

0.117

SEE NOTE

PACKAGE DESIGNATOR ‘UA’

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

Dwg. MH-014D mm

4.17

4.04

1.57

1.47

0.38

1.27

BSC

45°

16.26

15.24

0.41

2.16

MAX

45°

0.79

123

3.10

2.97

SEE NOTE

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 design of its
products.

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 which may result from its use.

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.

3134

LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION

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

HALL-EFFECT SENSORS SELECTION GUIDE

Partial Part Avail. Oper. Characteristics at TA = +25°C
Number Temp. B

OP(max)BRP(min)

B

hys(typ)

Features Notes

HALL-EFFECT UNIPOLAR SWITCHES in order of B

OP

and B

hys

3240 E/L +50 +5.0 10 chopper stabilized 1
3210 E ±70 ±5.0 7.7 micropower, chopper stabilized
3361 E +120 +50 5.0* 2-wire, chopper stabilized
3362 E +120 +50 5.0* 2-wire, chopper stabilized
3161 E +160 +30 20 2-wire
3141 E/L +160 +10 55
3235 S +175 +25 15* output 1 2

-25 -175 15* output 2 2
5140 E +200 +50 55 300 mA output 1, 3
3142 E/L +230 +75 55
3143 E/L +340 +165 55
3144 E/L +350 +50 55
3122 E/L +400 +140 105
3123 E/L +440 +180 105
3121 E/L +450 +125 105
3150 J +40 to +850 – 20

programmable, chopper stabilized

1

HALL-EFFECT LATCHES & BIPOLAR SWITCHES† in order of B

OP

and B

hys

3260 E/L +30 -30 20 bipolar, chopper stabilized
3280 E/L +40 -40 45 chopper stabilized
3134 E/L +50 -50 27 bipolar switch
3133 K/L/S +75 -75 52 bipolar switch
3281 E/L +90 -90 100 chopper stabilized
3132 K/L/S +95 -95 52 bipolar switch
3187 E/L [phone]*
3177 S [phone]
3625 S [phone] mA outputs 1, 3, 5
3626 S [phone] mA outputs 1, 3, 5
3195 E/L [phone], 4
3197 L [phone]
3175 S [phone]
3188 E/L [phone]*
3283 E/L [phone] chopper stabilized
3189 E/L [phone]*
3275 S [phone]* 5
3185 E/L [phone]*

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°C

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.
†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.