Page 1
The A3260-- Hall-effect bipolar 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 dynamic
offset cancellation, which reduces the residual offset voltage normally
caused by device overmolding, temperature dependencies, and thermal
stress.
The device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a constant-current open-collector output. A south
pole of sufficient strength will turn the output OFF. An on-board
regulator permits operation with supply voltages of 3.5 to 24 volts.
Noise radiation is limited by control of the output current slew rate.
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is -40°C to +85°C and ‘L–’ is
-40°C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LH’ is a miniature lowprofile surface-mount package, ‘–LT’ is a miniature SOT-89/TO243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet
27631.50
FEATURES
■ Internal Current Regulator for 2-Wire Operation
■ Output Slew Rate Controlled
■ Resistant to Physical Stress
■ Superior Temperature Stability
■ Operation From Unregulated Supply
■ Reverse Battery Protection
■ Solid-State Reliability
■ Small Size
Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3260ELH .
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT BIPOLAR SWITCH
Suffix Code 'LH' Pinning
Supply Voltage, VCC........................... 27 V
Reverse Battery Voltage, V
RCC
.......... -16 V
Magnetic Flux Density, B ........... Unlimited
Package Power Dissipation, PD. See Graph
Junction Temperature, TJ............... +170°C
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
ABSOLUTE MAXIMUM RATINGS
at TA=+25°C
ADVANCE INFORMATION
(subject to change without notice)
June 30, 2000
NC
X
SUPPLY
GROUND
12
3
Dwg. PH-003-5
NO (INTERNAL)
CONNECTION
Pinning is shown viewed from branded side.
Page 2
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
FUNCTIONAL BLOCK DIAGRAM
W
Copyright © 2000, Allegro MicroSystems, Inc.
Dwg. FH-020-4
X
DYNAMIC
OFFSET CANCELLATION
SUPPLY
REG.
SAMPLE
& HOLD
LOW-PASS
FILTER
TO ALL
SUBCIRCUITS
GROUND
Pinning is shown viewed from branded side.
Suffix Code 'UA' Pinning
(SIP)
Suffix Code 'LT' Pinning
(SOT-89/TO-243AA)
X
Dwg. PH-003-7A
1
SUPPLY
GROUND
32
GROUND
X
Dwg. PH-003-6
1
SUPPLY
GROUND
32
NO (INTERNAL)
CONNECTION
NC
Page 3
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
3
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage V
CC
Operating 3.5 12 24 V
Output Current I
GND(L)
B > B
OP
-4.0 -6.5 -8.0 mA
I
GND(H)
B < B
RP
-11 -14.5 -18 mA
Chopping Frequency f
C
– 340 – kHz
Output Slew Rate di/dt CL = 20 pF 0.5 — 2.0 mA/µs
Output Settling Time t
sd
CL = 20 pF — — 20 µs
Reverse Battery Current I
CC
V
RCC
= -16 V – – -15 mA
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Operate Point B
OP
–1030 G
Release Point B
RP
-30 -10 – G
Hysteresis B
hys
BOP - B
RP
–20– G
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
NOTE — Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
NOTES:1. . BOP = operate point (output turns OFF); BRP = release point (output turns ON).
2. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
Page 4
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
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Page 5
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
5
SENSOR LOCATIONS
(±0.005” [0.13 mm] die placement)
Package Designator “LH”
Package Designators “UA” and "UA-TL"
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
0.038"
0.96 mm
1 2
Dwg. MH-025
0.011"
0.28 mm
NOM
ACTIVE AREA DEPTH
0.059"
1.49 mm
A
3
0.045"
1.14 mm
1 32
Dwg. MH-008-8
0.030"
0.76 mm
NOM
ACTIVE AREA DEPTH
0.088"
2.24 mm
A
1 32
Dwg. MH-011-9A
0.018"
0.46 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
0.080"
2.04 mm
0.056"
1.44 mm
A
Package Designator “LT”
600
400
200
20 60 100 140
0
AMBIENT TEMPERATURE in °C
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Dwg. GH-046-2C
Suffix "–UA"
R
θJA
= 206°C/W
40 80 120 180
700
500
300
100
160
Suffix "–LT"
R
θJA
= 258°C/W
Suffix "–LH"
R
θJA
= 248°C/W
Suffix "E–"
Suffix "L–"
Allegro
Page 6
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production.
To become qualified, except for the destructive ESD tests, no failures are permitted.
CRITERIA FOR DEVICE QUALIFICATION
Qualification Test Test Method and Test Conditions Test Length Samples Comments
Biased Humidity (HAST) TA = 130°C, RH = 85% 50 hrs 77 VCC = V
OUT
= 5 V
High-Temperature JESD22-A108, 408 hrs 77 V
CC
= 24 V,
Operating Life (HTOL) TA = 150°C, TJ ≤ 165°CV
OUT
= 20 V
Accelerated HTOL TA = 175°C, TJ = 190°C 504 hrs 77 VCC = 24 V,
V
OUT
= 20 V
Autoclave, Unbiased JESD22-A102, Condition C, 96 hrs 77
TA = 121°C, 15 psig
High-Temperature MIL-STD-883, Method 1008, 1000 hrs 77
(Bake) Storage Life TA = 170°C
Temperature Cycle MIL-STD-883, Method 1010, 500 cycles 77
-65°C to +150°C
Latch-Up — Pre/Post 6
Reading
Electro-Thermally — Pre/Post 6
Induced Gate Leakage Reading
ESD, CDF-AEC-Q100-002 Pre/Post x per Test to failure,
Human Body Model Reading test All leads > TBD
Electrical Distributions Per Specification — 30
Page 7
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
7
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. 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.
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.
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. The chopperstabilizing technique cancels the mismatching of the resistors by
changing the direction of the current flowing through the Hall
plate and Hall voltage measurement taps, while maintaining the
Hall-voltage signal that is induced by the external magnetic
flux. The signal is, then, captured by a sample-and-hold circuit.
Operation. The output of these devices turns ON when a
magnetic field (north pole) perpendicular to the Hall sensor
exceeds the release point threshold (BRP). After turn-ON, the
output will source current equal to the device operating current
plus a current source (I
GND(H)
). When the magnetic field is
increased (south pole) above the operate point (BOP), the output
will source current equal to the Hall-effect sensor operating
current with the current source turned OFF (I
GND(L)
). The
difference in the magnetic operate and release points is the
hysteresis (B
hys
) of the device. The hysteresis allows clean
switching of the output even in the presence of external mechanical vibration or 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.
Extensive applications information on magnets and Halleffect sensors is also available in the Allegro Electronic Data
Book AMS-702 or Application Note 27701.
Dwg. EH-012
REG
SAMPLE
& HOLD
X
+V
HALL
VOLTAGE
B
+
—
Dwg. AH-011-2
0 +B
0
OUTPUT CURRENT
FLUX DENSITY
Dwg. GH-034-6
-B
+I
I
OUT
+ I
CC
B
RP
B
OP
I
CC
100 Ω
Dwg. EH-011-2A
0.1 µF
SUPPLY
X
1
3
2
'UA' PACKAGE
0.95 V
–
+
Page 8
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
PACKAGE DESIGNATOR 'LH'
(fits SC-74A solder-pad layout)
Dwg. MA-010-3B mm
12
0.15
0.00
0.20
0.127
3.10
2.90
2.10
1.85
3.00
2.70
0.95
BSC
0.55
REF
0.50
0.30
3
0° TO 8°
0.25
MIN
1.10
0.90
1.25
0.90
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.
Dwg. MA-011-3 mm
12
1.00
2.40
0.95
0.70
3
Dwg. MA-010-3B in
12
0.006
0.000
0.0079
0.0050
0.122
0.114
0.083
0.073
0.118
0.106
0.037
BSC
0.022
REF
0.020
0.012
3
0° TO 8°
0.020
MIN
0.043
0.035
0.049
0.035
Dwg. MA-011-3 in
12
0.039
0.094
0.03
7
0.028
3
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
Page 9
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
9
Dwg. MA-009-3A in
1
23
0.072
0.064
0.167
0.155
0.059
BSC
0.0189
0.0142
0.047
0.035
0.102
0.090
0.063
0.055
0.0173
0.0138
0.090
0.084
0.0221
0.0173
0.118
BSC
0.181
0.173
Dwg. MA-009-3A mm
1
23
4.60
4.40
1.83
1.62
4.25
3.94
1.50
BSC
0.48
0.36
1.20
0.89
2.60
2.29
1.60
1.40
0.44
0.35
2.29
2.13
0.56
0.44
3.00
BSC
PACKAGE DESIGNATOR 'LT'
(SOT-89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
13
B
2.5
0.8
2.6
1.2
4.6
2.0
Dwg. MA-012-3 mm
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
2
0.7
TYP
0.8
TYP
A
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
1
B
0.098
0.031
0.102
0.047
0.181
0.079
Dwg. MA-012-3 in
Pads 1, 2, 3, and A — Standard SOT-89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
2
0.028
TYP
0.031
TYP
A
3
Page 10
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
Surface-Mount Lead Form (Suffix '-TL')
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
PACKAGE DESIGNATOR 'UA'
0.095
±0.005
0.020
MIN
FLAT
Dwg. MH-015 in
0.004
MAX
0.002
MAX
0°–8°
2.41
±0.13
0.51
MIN
FLAT
Dwg. MH-015 mm
0.10
MAX
0.051
MAX
0°–8°
Dwg. MH-014E mm
4.17
4.04
1.57
1.47
0.44
0.35
1.27
BSC
45°
16.26
15.24
0.48
0.36
2.16
MAX
45°
0.79
123
3.10
2.97
SEE NOTE
Dwg. MH-014E in
0.164
0.159
0.062
0.058
0.0173
0.0138
0.050
BSC
45°
0.640
0.600
0.0189
0.0142
0.085
MAX
45°
0.031
123
0.122
0.117
SEE NOTE
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.
Page 11
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
www.allegromicro.com
11
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 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.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
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.
Page 12
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
12
HALL-EFFECT SENSORS
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
3209 E ±60 ±5.0 7.7 400 µW, chopper stabilized
3210 E ±60 ±5.0 7.7 25 µW, chopper stabilized
3361 E +55* +110‡ 5.0* 2-wire, chopper stabilized
3362 E +110 +55 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 +150 -150 100*
3177 S +150 -150 200
3625 S +150 -150 200 900 mA outputs 1, 3, 5
3626 S +150 -150 200 400 mA outputs 1, 3, 5
3195 E/L +160 -160 220 1, 4
3197 L +160 -160 230 1
3175 S +170 -170 200
3188 E/L +180 -180 200*
3283 E/L +180 -180 300 chopper stabilized
3189 E/L +230 -230 100*
3275 S +250 -250 100* 5
3185 E/L +270 -270 340*
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. ‡ Maximum
† 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.
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