Allegro A3281LUA, A3281LLT, A3281LLH, A3281EUA-TL, A3281EUA Datasheet
...
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
low-profile 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
27609.20
FEATURES
■ 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
3280, 3281,
AND
3283
Supply Voltage, VCC........................ 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
....................... Internally Limited
Reverse Output Current, I
OUT
........ -50 mA
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
Pinning is shown viewed from branded side.
Always order by complete part number: the prefix ‘A’ + the basic fourdigit part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3281ELH .
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
Dwg. PH-003-2
1
SUPPLY
V
CC
GROUND
32
OUTPUT
X
PTCT
Suffix '–LT' & '–UA' Pinning
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
FUNCTIONAL BLOCK DIAGRAM
Copyright © 2000 Allegro MicroSystems, Inc.
Suffix ‘–LH’ Pinning
Dwg. PH-003-4
SUPPLY
GROUND
OUTPUT
V
CC
X
PTCT
12
3
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–"
Dwg. FH-020-1
GROUND
OUTPUT
<1Ω
X
DYNAMIC
OFFSET CANCELLATION
SUPPLY
CONTROL
CURRENT
LIMIT
REG.
SAMPLE
& HOLD
LOW-PASS
FILTER
TO ALL
SUBCIRCUITS
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
www.allegromicro.com
3
Part Numbers
1
A3280 A3281 A3283
Characteristic Test Conditions Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units
Operate Point, B
OP
at TA = +25°C and TA = max. 5.0 22 40 15 50 90 100 150 180 G
at TA = -40°C 5.0 – 40 15 – 90 100 – 200 G
Release Point, B
RP
at TA = +25°C and TA = max. -40 -23 -5.0 -90 -50 -15 -180 -150 -100 G
at TA = -40°C -40 – -5.0 -90 – -15 -200 – -100 G
Hysteresis, B
hys
at TA = +25°C and TA = max. 10 45 80 30 100 180 – 300 360 G
(BOP - BRP)
at TA = -40°C – – 80 – – 180 – – 400 G
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 TA = +25°C and VCC = 12 V and is for design information only.
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage Range V
CC
Operating, TJ < 170°C
1
4.2 – 24 V
Output Leakage Current I
OFF
V
OUT
= 24 V, B < B
RP
––10µA
Output Saturation Voltage V
OUT(SAT)
I
OUT
= 20 mA, B > B
OP
– 185 500 mV
Output Current Limit I
OM
B > B
OP
30 – 60 mA
Power-On Time t
po
VCC > 4.2 V – – 50 µs
Chopping Frequency f
C
– 340 – kHz
Output Rise Time t
r
RL = 820 Ω, CL = 20 pF – 0.2 2.0 µs
Output Fall Time t
f
RL = 820 Ω, CL = 20 pF – 0.1 2.0 µs
Supply Current I
CC
B < BRP, VCC = 12 V – 3.0 8.0 mA
B > BOP, VCC = 12 V – 4.0 8.0 mA
Reverse Battery Current I
CC
V
RCC
= -30 V – – -5.0 mA
Zener Voltage VZ + V
D
ICC = 15 mA, TA = 25°C 283237 V
Zener Impedance z
z
+ z
D
ICC = 15 mA, TA = 25°C–50–Ω
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.
ELECTRICAL CHARACTERISTICS over operating temperature range.
MAGNETIC CHARACTERISTICS over operating supply voltage range.
3280, 3281,
AND
3283
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
0 50 100
AMBIENT TEMPERATURE IN °C
-50
Dwg. GH-026-3
SWITCH POINTS IN GAUSS
0
10
OPERATE POINT
150-25 25 75 125
20
30
40
50
-50
-40
-30
-20
-10
VCC = 4.5 V
V
CC
= 24 V
RELEASE POINT
0 50 100
AMBIENT TEMPERATURE IN °C
-50
Dwg. GH-026-4
SWITCH POINTS IN GAUSS
0
20
OPERATE POINT
150-25 25 75 125
40
60
80
100
-100
-80
-60
-40
-20
VCC = 4.5 V to 24 V
RELEASE POINT
* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).
A3283* SWITCH POINTS
A3280* SWITCH POINTS
A3281* SWITCH POINTS
0 50 100
AMBIENT TEMPERATURE IN °C
-50
Dwg. GH-026-6
SWITCH POINTS IN GAUSS
0
40
OPERATE POINT
150-25 25 75 125
80
120
160
200
-200
-160
-120
-80
-40
VCC = 4.5 V
V
CC = 24 V
RELEASE POINT
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