Datasheet 3240 Datasheet (ALLEGRO)

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3240

CHOPPER-STABILIZED, PRECISION

HALL-EF FECT SWITCH

Data Sheet

27621.20c

Suffi x ‘–LT’ & ‘–UA’ Pinning

(SOT89/TO-243AA & ultra-min SIP)

X

PTCT

V

CC

1

SUPPLY

Pinning is shown viewed from branded side.

32

GROUND

Dwg. PH-003-2

OUTPUT

The A3240-- Hall-effect switch is an extremely temperature-stable
and stress-resistant sensor especially suited for operation over extended
tem per a ture ranges to +150°C. Superior high-temperature per for mance
is made possible through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding, tem per a­ ture de pen den cies, and thermal stress.

The device includes on a single silicon chip a voltage regulator, Hall­voltage generator, small-signal amplifi er, chopper sta bi li za tion, Schmitt
trigger, and a short-circuit protected open-collector output to sink up to
25 mA. A south pole of suffi cient strength will turn the output on. An
on-board regulator permits operation with supply voltages of 4.2 to 24
volts.

Three package styles provide a magnetically op ti mized pack age for
most ap pli ca tions. Package type LH is a modifi ed SOT23W surface-
mount package, LT is a miniature SOT89/TO-243AA transistor package
for surface-mount applications; while UA is a three-lead ultra-mini-SIP
for through-hole mounting. The LH and UA packages are also available
in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated
leadframe.

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Supply Voltage, VCC .......................... 26.5 V

Reverse Battery Voltage, V

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

Output OFF Voltage, V
Continuous Output Current,
I
Reverse Output Current, I
Package Power Dissipation, PD See Graph

Junction Temperature, TJ ................ +170°C

Operating Temperature Range, T

Range ‘L’.................... -40°C to +150°C

Storage Temperature Range,

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

*Internal current limiting is intended to protect
the device from output short circuits.

......................................... 25 mA*

OUT

Range ‘E’ ..................... -40°C to +85°C

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

RCC

.................. 26 V

OUT

......... -50 mA

OUT

A

FEATURES

■ Resistant to Physical Stress

■ Superior Temperature Stability

■ Output Short-Circuit Protection

■ Operation From Unregulated Supply

■ Reverse Battery Protection

■ Sol id-State Reliability

■ Small Size

Product Selection Guide

Part Number Pb-free Packing* Mounting

A3240ELHLT – 7-in. reel, 3000 pieces/reel Surface Mount

A3240ELHLT-T Yes 7-in. reel, 3000 pieces/reel Surface Mount

A3240ELT – Bulk, 500 pieces/bag Surface Mount

A3240ELTTR – 7-in. reel, 3000 pieces/reel Surface Mount

A3240EUA – Bulk, 500 pieces/bag SIP through hole

A3240EUA-T Yes Bulk, 500 pieces/bag SIP through hole

A3240LLHLT – 7-in. reel, 3000 pieces/reel Surface Mount

A3240LLHLT-T Yes 7-in. reel, 3000 pieces/reel Surface Mount

A3240LLT – Bulk, 500 pieces/bag Surface Mount

A3240LLTTR – 7-in. reel, 3000 pieces/reel Surface Mount

A3240LUA – Bulk, 500 pieces/bag SIP through hole

A3240LUA-T Yes Bulk, 500 pieces/bag SIP through hole

*Contact Allegro for additional packing options.

3240

CHOPPER-STABILIZED,

PRECISION

HALL-EFFECT SWITCH

Ambient, T

(ºC)

–40 to 85

–40 to 150

A

B

RP(MIN)

(G)

5.0 50

B

OP(MAX)

(G)

www.allegromicro.com

2

3240

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH

SUPPLY

FUNCTIONAL BLOCK DIAGRAM

800

700

600

X

REG.

DYNAMIC

OFFSET CANCELLATION

Suffix "–UA"
R

θJA

= 165°C/W

TO ALL

SUBCIRCUITS

& HOLD

SAMPLE

FILTER

LOW-PASS

OUTPUT

CONTROL

CURRENT

LIMIT

<1Ω

GROUND

Dwg. FH-020-1

Suffix ‘–LH’ Pinning

(SOT23W)

3

500

Suffix "–LH"
R

θJA

400

300

200

100

ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS

0

20 60 100 140

= 228°C/W

Suffix "E–"

40 80 120 180

AMBIENT TEMPERATURE in °°°°C

3

Suffix "–LT"
R

θJA

= 180°C/W

V

Suffix "L–"

160

Dwg. GH-046-2D

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

Copyright © 2000, 2003, 2004 Allegro MicroSystems, Inc.

X

PTCT

CC

12

SUPPLY

GROUND

Dwg. PH-003-4

OUTPUT

3240

CHOPPER-STABILIZED,

PRECISION

HALL-EFFECT SWITCH

ELECTRICAL CHARACTERISTICS over operating temperature range.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage Range V

Output Leakage Current I

Output Saturation Voltage V

OUT(SAT)

Output Current Limit I

Power-On Time t

Chopping Frequency f

Output Rise Time t

Output Fall Time t

Supply Current I

CC

OFF

OM

po

C

r

f

CC

Operating, TJ < 165°C

V

= 24 V, B < B

OUT

I

= 20 mA, B > B

OUT

B > B

OP

VCC > 4.2 V – – 50 µs

RL = 820 Ω, CL = 20 pF – 0.2 2.0 µs

RL = 820 Ω, CL = 20 pF – 0.1 2.0 µs

B < BRP, VCC = 12 V – 3.0 6.0 mA

1

RP

OP

B > BOP, VCC = 12 V – 4.0 6.0 mA

Reverse Battery Current I

CC

Zener Voltage VZ + V

Zener Impedance zz + z

D

D

V

= -30 V – – -5.0 mA

RCC

ICC = 15 mA, TA = 25°C 283237 V

ICC = 15 mA, TA = 25°C–50–Ω

NOTES: 1. Maximum voltage must be adjusted for power dissipation and junction temperature.

2. BOP = operate point (output turns on); BRP = release point (output turns off).

3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.

4.2–24V

––10µA

– 185 500 mV

30 – 60 mA

– 340 – kHz

MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Operate Point B

Release Point B

Hysteresis B

OP

RP

hys

BOP - B

RP

NOTES: 1. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.

2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).

www.allegromicro.com

–3550G

5.0 25 – G

–10– G

4

3240

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH

TYPICAL OPERATING CHARACTERISTICS

50

40

30

20

as a function of temperature

SWITCH POINTS

OPERATE POINT

RELEASE POINT

OUTPUT SATURATION VOLTAGE

300

IOUT = 20 mA

VCC = 12 V

200

100

SATURATION VOLTAGE IN mV

SWITCH POINTS IN GAUSS

10

0

-50

VCC = 4.5 V

CC

= 24 V

V

0 50 100

AMBIENT TEMPERATURE IN °°°°C

SUPPLY CURRENT

6.0

5.0

4.0

SUPPLY CURRENT IN mA

3.0

OUTPUT OFF, B < B

150-25 25 75 125

Dwg. GH-026-5

RP

VCC = 12 V

OUTPUT ON, B > B

OP

0

-50

0 25 50 75 100

AMBIENT TEMPERATURE IN °°°°C

150-25 125

Dwg. GH-029-4

2.0

-50

0 25 50 75 100

AMBIENT TEMPERATURE IN °°°°C

125-25 150

Dwg. GH-028-5

115 Northeast Cutoff, Box 15036

5

Worcester, Massachusetts 01615-0036 [phone]

CHOPPER-STABILIZED,
HALL-EFFECT SWITCH

TYPICAL OPERATING CHARACTERISTICS

as a function of supply voltage

SWITCH POINTS

40

OPERATE POINT

30

RELEASE POINT

3240

PRECISION

250

225

200

20

10

SWITCH POINT IN GAUSS

0

3.0

3.5

OUTPUT SATURATION VOLTAGE

IOUT = 20 mA

TA = 150°C

A = +25°C

T

A = -40°C

T

4.0 4.5 5.0

SUPPLY VOLTAGE IN VOLTS

8.0

7.0

6.0

5.0

4.0

TA = 150°C

A

= -40°C

T

24

Dwg. GH-021-2

SUPPLY CURRENT

OUTPUT ON

TA = 150°C

A

= +25°C

T

A

= -40°C

T

175

SATURATION VOLTAGE IN mV

150

3.0

3.5

4.0 4.5 5.0

SUPPLY VOLTAGE IN VOLTS

www.allegromicro.com

24

Dwg. GH-055-1

3.0

SUPPLY CURRENT IN mA

2.0

1.0

0

4.0 6.0 9.0

3.0

5.0 12

SUPPLY VOLTAGE IN VOLTS

10 118.07.0

Dwg. GH-058-4

6

3240

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH

SENSOR LOCATIONS

Package Designator ‘LH’

ACTIVE AREA DEPTH

0.011"

0.28 mm
NOM

A

1

Package Designator ‘LT’

ACTIVE AREA DEPTH

0.0305"

0.775 mm
NOM

A

1 32

Package Designator ‘UA’

3

0.059"

1.49 mm

2

0.088"

2.24 mm

0.038"

0.96 mm

Dwg. MH-025

0.045"

1.14 mm

Dwg. MH-008-8A

ACTIVE AREA DEPTH

0.0195"

0.50 mm
NOM

0.080"

2.04 mm

0.056"

1.44 mm

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;

Allegro

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.

BRANDED
SURFACE

A

2

1

3

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

Dwg. MH-011-9B

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.

7

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

FUNCTIONAL DESCRIPTION

3240

CHOPPER-STABILIZED,

PRECISION

HALL-EFFECT SWITCH

Chopper-Stabilized Technique. The Hall element can be
considered as a resistor array similar to a Wheatstone bridge. A
large portion of the offset is a result of the mismatching of these
resistors. These devices use a proprietary dynamic offset
cancellation technique, with an internal high-frequency clock to
reduce the residual offset voltage of the Hall element that is
normally caused by device overmolding, temperature dependen­cies, and thermal stress. The chopper-stabilizing technique
cancels the mismatching of the resistor circuit by changing the
direction of the current flowing through the Hall plate using
CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-and­hold circuit and further processed using low-offset bipolar
circuitry. This technique produces devices that have an
extremely stable quiescent Hall output voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling. This technique will also slightly degrade the device
output repeatability. A relatively high sampling frequency is
used in order that faster signals can be processed.

More detailed descriptions of the circuit operation can be

found in: Technical Paper STP 97-10, Monolithic Magnetic

Hall Sensor Using Dynamic Quadrature Offset Cancellation
and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers
With A Track-and-Hold Signal Demodulator.

Operation. The output of these devices switches low (turns
on) when a magnetic field (south pole) perpendicular to the Hall
sensor exceeds the operate point threshold (BOP). After turn-on,
the output is capable of sinking 25 mA and the output voltage is
V

OUT(SAT)

. When the magnetic field is reduced below the
release point (BRP), the device output goes high (turns off). The
difference in the magnetic operate and release points is the
hysteresis (B

) of the device. This built-in hysteresis allows

hys

clean switching of the output even in the presence of external
mechanical vibration and electrical noise.

Applications. It is strongly recommended that an external
bypass capacitor be connected (in close proximity to the Hall
sensor) between the supply and ground of the device to reduce
both external noise and noise generated by the chopper­stabilization technique.

The simplest form of magnet that will operate these devices
is a ring magnet. Other methods of operation, such as linear
magnets, are possible. Extensive applications information on
magnets and Hall-effect sensors is also available in Application
Note 27701, or at

www.allegromicro.com

B

+V

+V

V

CC

OUTPUT VOLTAGE

0

0

PTCT

X

Dwg. AH-011-2

CC

V

REG

HALL
VOLTAGE

X

—

+

B

RP

FLUX DENSITY

3

2

1

& HOLD

SAMPLE

Dwg. EH-012

B

OP

V

OUT(SAT)

+B

Dwg. GH-007-2

SUPPLY

OUTPUT

0.1 µF

SUPPLY

Dwg. EH-013

www.allegromicro.com

8

3240

7

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH

PACKAGE DESIGNATOR ‘LH’

(fits SC-59A solder-pad layout)

0.083

0.073

0.022

REF

0.006

0.000

0.122

0.114

0.020

0.012

12

Dimensions in Inches

(for reference only)

3

0.118

0.106

GAUGE PLANE

SEATING PLANE

0.037

BSC

0.045

0.0079

0.0050

0.032

0° TO 8°

0.010

BSC

Dwg. MA-010-3D in

0.010

MIN

0.55

REF

0.15

0.00

2.10

1.85

Dimensions in Millimeters

3.10

2.90

0.50

0.30

3

12

(controlling dimensions)

3.00

2.70

GAUGE PLANE

SEATING PLANE

0.95

BSC

1.13

0° TO 8°

0.20

0.127

0.87

0.25

BSC

Dwg. MA-010-3D mm

0.25

MIN

0.028

3

0.039

0.094

12

0.03

Dwg. MA-011-3 in

1.00

12

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. Where no tolerance is specified, dimension is nominal.

5. Add "LT" to part number for tape and reel.

9

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

0.70

3

2.40

0.95

Dwg. MA-011-3 mm

PACKAGE DESIGNATOR ‘LT’

(SOT89/TO-243AA)

3240

CHOPPER-STABILIZED,

PRECISION

HALL-EFFECT SWITCH

0.167

0.155

0.047

0.035

0.059

BSC

Dimensions in Inches

(for reference only)

0.181

0.173

0.072

0.064

0.102

0.0221

0.0173

0.090

0.0189

0.0142

1

23

0.118

BSC

0.063

0.055

0.090

0.084

0.0173

0.0138

Dwg. MA-009-3A in

4.25

3.94

1.20

0.89

1.50

BSC

Dimensions in Millimeters

(controlling dimensions)

4.60

4.40

1.83

1.62

2.60

0.56

0.44

2.29

0.48

0.36

1

23

3.00

BSC

1.60

1.40

2.29

2.13

0.44

0.35

Dwg. MA-009-3A mm

0.098

0.079

B

1

0.028

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

0.031

A

2

0.102

0.181

0.047

3

0.031

TYP

Dwg. MA-012-3 in

0.7

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

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

2.5

2.0

B

13

0.8

A

2

2.6

1.2

0.8

TYP

4.6

Dwg. MA-012-3 mm

10

3240

a

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH

PACKAGE DESIGNATOR ‘UA’

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

SEE NOTE

45°

0.122

0.117

0.640

0.600

0.085

123

MAX

0.164

0.159

0.050

BSC

0.062

0.058

0.031

0.0189

0.0142

0.0173

0.0138

Dwg. MH-014E in

45°

SEE NOTE

45°

3.10

2.97

16.26

15.24

2.16

123

MAX

4.17

4.04

1.27

BSC

1.57

1.47

45°

0.79

0.44

0.35

0.48

0.36

Dwg. MH-014E mm

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.

6. Supplied in bulk pack (500 pieces per bag).

11

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]

R