A3240ELTTR-T [ALLEGRO]
Analog Circuit, 1 Func, PSSO3, ROHS COMPLIANT, TO-243AA, SOT-89, 3 PIN;
| 型号： | A3240ELTTR-T |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Analog Circuit, 1 Func, PSSO3, ROHS COMPLIANT, TO-243AA, SOT-89, 3 PIN |
| 文件： | 总11页 (文件大小：434K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Not for New Design
These parts are in production but have been determined to be
NOT FOR NEW DESIGN. This classification indicates that sale of
this device is currently restricted to existing customer applications.
The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no
longer available.
Date of status change: May 4, 2009
Recommended Substitutions:
The replacement part is the A1120 next-generation chopper-stabilized
switch.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
A3240
Chopper-Stabilized, Precision
Hall-Effect Switch
Features and Benefits
▪ Resistant to Physical Stress
▪ Superior Temperature Stability
▪ Output Short-Circuit Protection
▪ Operation From Unregulated Supply
▪ Reverse Battery Protection
▪ Solid-State Reliability
Description
The A3240 Hall-effect switch is an extremely tempera-
ture-stable and stress-resistant sensor especially suited for
operation over extended temperature ranges to +150°C.
Superior high-temperature performance is made possible
through dynamic offset cancellation, which reduces the
residualoffsetvoltagenormallycausedbydeviceovermolding,
temperature dependencies, and thermal stress.
▪ Small Size
Thedeviceincludesonasinglesiliconchipavoltageregulator,
Hall-voltage generator, small-signal amplifier, chopper
stabilization, Schmitt trigger, and a short-circuit protected
open-collector output to sink up to 25 mA. A south pole of
sufficientstrengthwillturntheoutputon. Anon-boardregulator
permits operation with supply voltages of 4.2 to 24 volts.
Packages:
Threepackagestylesprovideamagneticallyoptimizedpackage
formostapplications. PackagetypeLHisamodifiedSOT23W
surface-mount package, LT is a miniature SOT89/TO-243AA
transistorpackageforsurface-mountapplications;whileUAis
athree-leadultra-mini-SIPforthrough-holemounting.TheLH
and UA packages are also available in a lead (Pb) free version
(suffix, –T) , with a 100% matte tin plated leadframe.
3-pin SOT89
(LT package)
3-pin SOT23W
(LH package)
3-pin SIP
(UA package)
Not to scale
Functional Block Diagram
SUPPLY
TO ALL
SUBCIRCUITS
REG.
OUTPUT
X
CONTROL
CURRENT
LIMIT
<17
GROUND
Dwg. FH-020-1
27621.20h
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Selection Guide
Part Number
Ambient, TA
(ºC)
BRP(MIN)
(G)
BOP(MAX)
(G)
Packing*
Mounting
A3240ELHLT-T
A3240ELTTR-T
A3240EUA-T
7-in. reel, 3000 pieces/reel Surface Mount
7-in. reel, 1000 pieces/reel Surface Mount
–40 to 85
Bulk, 500 pieces/bag
SIP through hole
5.0
50
A3240LLHLT-T
A3240LLTTR-T
A3240LUA-T
7-in. reel, 3000 pieces/reel Surface Mount
7-in. reel, 1000 pieces/reel Surface Mount
–40 to 150
Bulk, 500 pieces/bag
SIP through hole
*Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating
26.5
–30
Unit
V
Supply Voltage
VCC
VRCC
VOUT
Reverse Battery Voltage
Output Off Voltage
V
26
V
Internal current limiting is intended to protect the
device from output short circuits.
Continuous Output Current
IOUT
25
mA
Reverse Output Current
IROUT
PD
B
–50
mA
W
Package Power Dissipation
Magnetic Flux Density
See graph
Unlimited
–40 to 85
–40 to 150
165
1 G = 0.1 mT (millitesla)
Range E
G
Operating Ambient Temperature
TA
ºC
ºC
ºC
ºC
Range L
Maximum Junction Temperature
Storage Temperature
TJ(max)
T
stg
–65 to 170
Allegro MicroSystems, Inc.
115 Northeast Cutoff
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Suffix ‘–LT’ & ‘–UA’ Pinning
(SOT89/TO-243AA & ultra-min SIP)
Suffix ‘–LH’ Pinning
(SOT23W)
3
X
PTCT
PTCT
V
CC
V
CC
1
2
1
2
3
Dwg. PH-003-4
Dwg. PH-003-2
Pinning is shown viewed from branded side.
Package Power Dissipation
Suffix "–UA"
800
700
R
θJA = 165°C/W
600
500
400
300
200
100
0
Suffix "–LT"
θJA = 180°C/W
Suffix "–LH"
θJA = 228°C/W
R
R
Suffix "E–"
Suffix "L–"
140
20
40
60
80
100
120
160
180
AMBIENT TEMPERATURE in °C
Dwg. GH-046-2D
Allegro MicroSystems, Inc.
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Copyright © 2000, 2003 Allegro MicroSystems, Inc.
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Typ.
Characteristic
Symbol
Test Conditions
Operating, TJ < 170°C1
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
B > BOP
Min.
4.2
–
Max.
24
Units
V
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
VCC
–
–
IOFF
10
μA
mV
mA
μs
VOUT(SAT)
–
185
–
500
60
IOM
tpo
fC
30
–
VCC > 4.2 V
–
50
Chopping Frequency
Output Rise Time
–
340
0.2
0.1
3.0
4.0
–
–
kHz
μs
tr
RL = 820 , CL = 20 pF
RL = 820 , CL = 20 pF
B < BRP, VCC = 12 V
B > BOP, VCC = 12 V
VRCC = -30 V
–
2.0
2.0
6.0
6.0
-5.0
37
Output Fall Time
tf
–
μs
Supply Current
ICC
–
mA
mA
mA
V
–
Reverse Battery Current
Zener Voltage
ICC
–
VZ + VD
zz + zD
ICC = 15 mA, TA = 25°C
ICC = 15 mA, TA = 25°C
28
–
32
50
Zener Impedance
–
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.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
BOP
Test Conditions
Min.
–
Typ.
Max.
50
–
Units
G
35
BRP
5.0
–
25
G
Bhys
BOP - BRP
10
–
G
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).
Allegro MicroSystems, Inc.
115 Northeast Cutoff
4
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
SWITCH POINTS
50
40
30
OPERATE POINT
RELEASE POINT
20
10
0
V
V
CC = 4.5 V
CC = 24 V
-50
-25
0
25
50
75
100
125
150
o
AMBIENT TEMPERATURE IN
C
Dwg. GH-026-5
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
300
200
6.0
IOUT = 20 mA
VCC = 12 V
V
CC = 12 V
5.0
4.0
3.0
2.0
OUTPUT ON, B > BOP
100
OUTPUT OFF, B < BRP
0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
o
AMBIENT TEMPERATURE IN
C
o
AMBIENT TEMPERATURE IN
C
Dwg. GH-029-4
Dwg. GH-028-5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
5
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage
SWITCH POINTS
40
OPERATE POINT
30
RELEASE POINT
T
T
A
A
= 150oC
= -40oC
20
10
0
24
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-021-2
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
250
225
200
8.0
I
OUT = 20 mA
OUTPUT ON
T
T
T
A
A
A
= 150oC
= +25oC
= -40oC
T
T
T
A
A
A
= 150oC
= +25oC
= -40oC
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
175
150
24
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
11
12
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058-4
Dwg. GH-055-1
Allegro MicroSystems, Inc.
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
FUNCTIONAL DESCRIPTION
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 cancel-
lation 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-and-hold 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.
REG
X
B
+V
Dwg. EH-012
—
HALL
VOLTAGE
+
Dwg. AH-011-2
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.
+V
V
CC
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
VOUT(SAT). When the magnetic field is reduced below the release
point (BRP), the device output goes high (turns off). The differ-
ence in the magnetic operate and release points is the hysteresis
(Bhys) of the device. This built-in hysteresis allows clean switch-
ing 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 chopper-stabiliza-
tion technique.
B
B
OP
RP
V
OUT(SAT)
0
0
+B
FLUX DENSITY
Dwg. GH-007-2
SUPPLY
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
OUTPUT
www.allegromicro.com
0.1 MF
X
SUPPLY
Dwg. EH-013
Allegro MicroSystems, Inc.
115 Northeast Cutoff
7
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Package LH, 3-Pin (SOT-23W)
+0.12
–0.08
2.98
3
D
1.49
+4°
4°
–0°
A
+0.020
0.180
–0.053
D
0.96
D
+0.10
2.90
+0.19
–0.06
2.40
1.91
–0.20
0.70
0.25 MIN
1.00
2
1
0.55 REF
0.25 BSC
0.95
PCB Layout Reference View
Seating Plane
Gauge Plane
B
Branded Face
8X 10° REF
1.00 ±0.13
+0.10
NNT
1
0.05
–0.05
C
Standard Branding Reference View
0.95 BSC
0.40 ±0.10
N = Last two digits of device part number
T = Temperature code
For Reference Only; not for tooling use (reference dwg. 802840)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
Active Area Depth, 0.28 mm REF
A
B
Reference land pattern layout
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
C
D
Branding scale and appearance at supplier discretion
Hall element, not to scale
Allegro MicroSystems, Inc.
115 Northeast Cutoff
8
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Package LT, 3-Pin (SOT89/TO-243AA)
4.50±0.10
+0.10
1.73
–0.11
2.50
A
2.00
2.24
0.80
1.14
2.60
4.60
+0.15
–0.16
+0.09
–0.07
2.45
Parting
Line
2.20
+0.15
–0.16
4.10
+0.20
–0.11
1.00
1.00
1
2
3
+0.04
–0.05
0.40
1.50
PCB Layout Reference View
0.70
1.50±0.10
B
Basic pads for low-stress, not self-aligning
Additional pad for low-stress, self-aligning
Additional area for IPC reference layout
2X 1.50 BSC
0.42±0.06
0.50±0.06
For Reference Only; not for tooling use (reference JEDEC. TO-243AA)
Dimensions in millimeters
NNT
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
1
Active Area Depth, 0.78 mm REF
A
B
C
Standard Branding Reference View
Reference land pattern layout (reference IPC7351 SOT89N);
All pads a minimum of 0.20 mm from all adjacent pads;
adjust as necessary to meet application process
requirements and PCB layout tolerances
= Supplier emblem
N = Last two digits of device part number
T = Temperature code
C
D
Branding scale and appearance at supplier discretion
Hall element, not to scale
Allegro MicroSystems, Inc.
115 Northeast Cutoff
9
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A3240
Chopper-Stabilized, Precision Hall-Effect Switch
Package UA, 3-Pin SIP
+0.08
–0.05
4.09
45°
B
C
E
2.06
1.52 ±0.05
1.45
E
E
Mold Ejector
Pin Indent
+0.08
–0.05
NNT
3.02
45°
Branded
Face
1
2.16
Standard Branding Reference View
D
MAX
= Supplier emblem
N = Last two digits of device part number
T = Temperature code
0.79 REF
A
0.51
REF
1
2
3
For Reference Only; not for tooling use (reference DWG-9049)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
+0.03
–0.06
0.41
15.75 ±0.51
Dambar removal protrusion (6X)
A
B
C
D
Gate burr area
Active Area Depth, 0.50 mm REF
Branding scale and appearance at supplier discretion
E
Hall element, not to scale
+0.05
–0.07
1.27 NOM
0.43
Copyright ©2000-2008, Allegro MicroSystems, Inc.
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 per-
mit 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’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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