3280, 3281,
AND
3283
Suffix '–LT' & '–UA' Pinning
(SOT89/TO-243AA & ultra-mini SIP)
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are ex-
tremely temperature-stable and stress-resistant sensors 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 three devices are identical except for magnetic switch points.
Each device includes on a single silicon chip a voltage regulator,
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 sufficient strength will turn the
output on. A north pole is necessary to turn the output off. An on-board
regulator permits operation with supply voltages of 4.2 to 24 volts.
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -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
SOT23W low-profile surface-mount package, ‘–LT’ is a miniature
SOT89/TO-243AA transistor package for surface-mount applications;
while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole
mounting.
Data Sheet
27609.20A
X
PTCT
V
CC
1
2
3
GROUND
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Supply Voltage, V
CC
........................
26.5 V
Reverse Battery Voltage, V
RCC
..........
-30 V
Magnetic Flux Density, B ...........
Unlimited
Output Off Voltage, V
OUT
...................
26 V
Continuous Output Current,
I
OUT
..........................................
25 mA*
Reverse Output Current, I
OUT
........
-50 mA
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
*Internal current limiting is intended to protect
the device from output short circuits.
OUTPUT
SUPPLY
FEATURES
s
s
s
s
s
s
s
s
Symmetrical Switch Points
Resistant to Physical Stress
Superior Temperature Stability
Output Short-Circuit Protection
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.,
A3281ELH .
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL
SUBCIRCUITS
DYNAMIC
OFFSET CANCELLATION
OUTPUT
SAMPLE
& HOLD
X
LOW-PASS
FILTER
CONTROL
CURRENT
LIMIT
<1Ω
GROUND
Dwg. FH-020-1
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Suffix ‘–LH’ Pinning
(SOT23W)
3
Suffix "–UA"
R
θJA
= 165°C/W
700
600
X
500
Suffix "–LH"
R
θJA
= 228°C/W
400
Suffix "–LT"
R
θJA
= 180°C/W
PTCT
V
300
CC
1
200
2
100
Suffix "L–"
0
20
40
60
100
80
120
AMBIENT TEMPERATURE in
°
C
140
160
180
Dwg. GH-046-2D
Dwg. PH-003-4
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, 2003 Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
Suffix "E–"
GROUND
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Characteristic
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
Chopping Frequency
Output Rise Time
Output Fall Time
Supply Current
Symbol
V
CC
I
OFF
V
OUT(SAT)
I
OM
t
po
f
C
t
r
t
f
I
CC
R
L
= 820
Ω,
C
L
= 20 pF
R
L
= 820
Ω,
C
L
= 20 pF
B < B
RP
, V
CC
= 12 V
B > B
OP
, V
CC
= 12 V
Reverse Battery Current
Zener Voltage
Zener Impedance
I
CC
V
Z
+ V
D
z
z
+ z
D
V
RCC
= -30 V
I
CC
= 15 mA, T
A
= 25°C
I
CC
= 15 mA, T
A
= 25°C
Test Conditions
Operating, T
J
< 170°C
1
V
OUT
= 24 V, B < B
RP
I
OUT
= 20 mA, B > B
OP
B > B
OP
V
CC
> 4.2 V
Min.
4.2
–
–
30
–
–
–
–
–
–
–
28
–
Typ.
–
–
185
–
–
340
0.2
0.1
3.0
4.0
–
32
50
Max.
24
10
500
60
50
–
2.0
2.0
8.0
8.0
-5.0
37
–
Units
V
µA
mV
mA
µs
kHz
µs
µs
mA
mA
mA
V
Ω
NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature.
2. B
OP
= operate point (output turns on); B
RP
= release point (output turns off).
3. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating voltage range.
Part Numbers
1
A3280
Characteristic
Operate Point, B
OP
Test Conditions
at T
A
= +25°C and T
A
= max.
at T
A
= -40°C
Release Point, B
RP
at T
A
= +25°C and T
A
= max.
at T
A
= -40°C
Hysteresis, B
hys
at T
A
= +25°C and T
A
= max.
at T
A
= -40°C
Min.
5.0
5.0
-40
-40
10
–
Typ. Max.
22
–
-23
–
45
–
40
40
-5.0
-5.0
80
80
Min.
15
15
-90
-90
30
–
A3281
Typ. Max.
50
–
-50
–
100
–
90
90
-15
-15
180
180
Min.
100
100
-180
-200
–
–
A3283
Typ. Max.
150
–
-150
–
300
–
180
200
-100
-100
360
360
Units
G
G
G
G
G
G
(B
OP
- B
RP
)
NOTES:1. Complete part number includes a suffix to identify operating temperature range (E or L) and
package type (LH, LT, or UA).
2. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
3. Typical Data is at T
A
= +25°C and V
CC
= 12 V and is for design information only.
4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
www.allegromicro.com
3
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
A3280* SWITCH POINTS
50
40
30
SWITCH POINTS IN GAUSS
OPERATE POINT
A3281* SWITCH POINTS
100
80
60
OPERATE POINT
20
10
0
-10
-20
-30
-40
-50
-50
RELEASE POINT
V
CC
= 4.5 V
V
CC
= 24 V
SWITCH POINTS IN GAUSS
40
20
0
-20
-40
-60
-80
-100
-50
RELEASE POINT
V
CC
= 4.5 V to 24 V
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-026-3
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-026-4
A3283* SWITCH POINTS
200
160
OPERATE POINT
120
SWITCH POINTS IN GAUSS
80
40
0
-40
-80
-120
RELEASE POINT
V
CC
= 4.5 V
V
CC
= 24 V
-160
-200
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-026-6
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature (cont'd)
OUTPUT SATURATION VOLTAGE
300
6.0
SUPPLY CURRENT
I
OUT
= 20 mA
V
CC
= 12 V
V
CC
= 12 V
SATURATION VOLTAGE IN mV
5.0
200
SUPPLY CURRENT IN mA
4.0
OUTPUT ON, B > B
OP
100
3.0
OUTPUT OFF, B < B
RP
0
-50
-25
0
25
50
75
100
125
150
2.0
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-029-4
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-028-5
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage
A3280* SWITCH POINTS
40
80
A3281* SWITCH POINTS
OPERATE POINT
OPERATE POINT
20
40
SWITCH POINT IN GAUSS
SWITCH POINT IN GAUSS
0
T
A
= 150°C
T
A
= -40°C
0
T
A
= 150°C
T
A
= -40°C
-20
RELEASE POINT
-40
RELEASE POINT
-40
3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-021-3
-80
3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-021-1
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
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5
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