A3260
2-Wire Chopper Stabilized
Precision Hall Effect Bipolar Switch
Last Time Buy
These parts are in production but have been determined to be
LAST TIME BUY. This classification indicates that the product is
obsolete and notice has been given. Sale of this device is currently
restricted to existing customer applications. The device should not be
purchased for new design applications because of obsolescence in the
near future. Samples are no longer available.
Date of status change: October 31, 2006
Deadline for receipt of LAST TIME BUY orders: April 27, 2007
Recommended Substitutions:
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.
3260
Suffix Code 'LH' Pinning
(SOT23W)
3
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT BIPOLAR SWITCH
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. Two package styles provide a magnetically opti-
mized package for most applications. Suffix ‘–LH’ is a miniature
SOT23W low-profile surface-mount package, while suffix ‘–UA’ is a
three-lead ultra-mini-SIP for through-hole mounting.
Data Sheet
27631.50d
X
NC
Dwg. PH-003-5
Pinning is shown viewed from branded side.
NO (INTERNAL)
CONNECTION
1
2
SUPPLY
GROUND
FEATURES
ABSOLUTE MAXIMUM RATINGS
at T
A
=+25°C
Supply Voltage, V
CC
...........................
27 V
Reverse Battery Voltage, V
RCC
..........
-16 V
Magnetic Flux Density, B ...........
Unlimited
Package Power Dissipation, P
D
.
See Graph
Junction Temperature, T
J
...............
+165°C
Operating Temperature Range, T
A
Suffix ‘E–’ ..................
-40°C to +85°C
Suffix ‘L–’ ................
-40°C to +150°C
Storage Temperature Range,
T
S
..............................
-65°C to +170°C
■
■
■
■
■
■
■
■
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
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL
SUBCIRCUITS
DYNAMIC
OFFSET CANCELLATION
SAMPLE
& HOLD
X
LOW-PASS
FILTER
GROUND
Dwg. FH-020-
Selection Guide
Part Number
1
Pb-Free
Packing
2
Mounting
Ambient, T
A
(°C)
–40 to 85
A3260ELHLT
–
7-in. reel, 3000 pieces/reel
3-pin SOT23W surface mount
A3260EUA
–
Bulk, 500 pieces/bag
3-pin SIP through hole
–40 to 85
variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification
indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing
customer applications. The variants should not be purchased for new design applications because of obsolescence in the
near future. Samples are no longer available. Status date change October 31, 2006. Deadline for receipt of LAST TIME BUY
orders is April 27, 2007. These variants include: A3260ELHLT and A3260EUA. Variants A3260LLHLT and A3260LUA are
discontinued.
2
Contact
1
Certain
Allegro for additional packing options.
2
115 Northeast Cutoff, Box 15036
W
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002, 2006 Allegro MicroSystems, Inc.
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
ELECTRICAL CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Supply Voltage
Output Current
Chopping Frequency
Output Slew Rate
Output Settling Time
Reverse Battery Current
Symbol
V
CC
I
GND(L)
I
GND(H)
f
C
di/dt
t
sd
I
CC
C
L
= 20 pF
C
L
= 20 pF
V
RCC
= -16 V
Test Conditions
Operating
B > B
OP
B < B
RP
Min.
3.5
-4.0
-11
–
0.5
—
–
Typ.
12
-6.5
-14.5
340
—
—
–
Max.
24
-8.0
-18
–
2.0
20
-15
Units
V
mA
mA
kHz
mA/µs
µs
mA
NOTES: 1. B
OP
= operate point (output turns OFF); B
RP
= release point (output turns ON).
2. Typical Data is at T
A
= +25°C and V
CC
= 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
B
OP
B
RP
B
hys
B
OP
- B
RP
Test Conditions
Min.
–
-40
2.0
Typ.
10
-10
20
Max.
40
–
–
Units
G
G
G
NOTES: 1. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
www.allegromicro.com
3
3260
2-WIRE, CHOPPER-STABILIZED,
PRECISION HALL-EFFECT
BIPOLAR SWITCH
SENSOR LOCATIONS
Package Designator “LH”
ACTIVE AREA DEPTH
0.011"
0.28 mm
NOM
0.059"
1.49 mm
3
0.038"
0.96 mm
Package Designators “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.080"
2.04 mm
0.056"
1.44 mm
A
1
2
Dwg. MH-025
A
BRANDED
SURFACE
1
2
3
Dwg. MH-011-9B
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
800
Allegro
Suffix "–UA"
R
JA
= 165°C/W
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
700
600
500
Suffix "–LH"
R
JA
= 228°C/W
400
300
200
Suffix "E–"
100
Suffix "L–"
0
20
40
60
100
80
120
AMBIENT TEMPERATURE in °C
140
160
180
Dwg. GH-046-2D
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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