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 +85C and `L' is
-40
C to +150C. Three package styles provide a magnetically opti-
mized package for most applications. Suffix `LH' is a miniature low-
profile surface-mount package, `LT' is a miniature SOT-89/TO-
243AA 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
I Internal Current Regulator for 2-Wire Operation
I Output Slew Rate Controlled
I Resistant to Physical Stress
I Superior Temperature Stability
I Operation From Unregulated Supply
I Reverse Battery Protection
I Solid-State Reliability
I 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, 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
............... +170
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
ABSOLUTE MAXIMUM RATINGS
at T
A
=+25
C
ADVANCE INFORMATION
(subject to change without notice)
June 30, 2000
NC
X
SUPPLY
GROUND
1
2
3
Dwg. PH-003-5
NO (INTERNAL)
CONNECTION
Pinning is shown viewed from branded side.
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
3
2
GROUND
X
Dwg. PH-003-6
1
SUPPLY
GROUND
3
2
NO (INTERNAL)
CONNECTION
NC
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
C
L
= 20 pF
0.5
--
2.0
mA/
s
Output Settling Time
t
sd
C
L
= 20 pF
--
--
20
s
Reverse Battery Current
I
CC
V
RCC
= -16 V
-15
mA
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
10
30
G
Release Point
B
RP
-30
-10
G
Hysteresis
B
hys
B
OP
- B
RP
20
G
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
NOTE -- Typical Data is at T
A
= +25
C and V
CC
= 12 V and is for design information only.
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.
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
3
2
Dwg. MH-008-8
0.030"
0.76 mm
NOM
ACTIVE AREA DEPTH
0.088"
2.24 mm
A
1
3
2
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
JA
= 206
C/W
40
80
120
180
700
500
300
100
160
Suffix "LT"
R
JA
= 258
C/W
Suffix "LH"
R
JA
= 248
C/W
Suffix "E"
Suffix "L"
Allegro
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