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Электронный компонент: A1146LLHLT-T

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A1145 and A1146
A1145-DS, Rev. 6
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
AB SO LUTE MAX I MUM RAT INGS
Supply Voltage, V
CC
...........................................28V
Reverse-Supply Voltage, V
RCC
........................18 V
Magnetic Flux Density, B .........................Unlimited
Power Dissipation, P
D
............................ Graph, p. 5
Operating Temperature
Ambient, T
A
, Range E.................. 40C to 85C
Ambient, T
A
, Range L................ 40C to 150C
Maximum Junction, T
J(max)
........................165C
Storage Temperature, T
S
.................. 65C to 170C
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Package LH, 3-pin SOT
Features and Benefits
The A1145 and A1146 devices are two-wire, unipolar, Hall effect switches that are
factory-programmed at end-of-line to optimize ultrasensitive magnetic switchpoint
accuracy. These devices use a patented high frequency chopper-stabilization tech-
nique, produced using the Allegro advanced BiCMOS wafer fabrication process,
to achieve magnetic stability and to eliminate offset inherent in single-element
devices exposed to harsh application environments.
Commonly found in a number of automotive applications, these switches are
utilized to sense seat track position, seat belt buckle presence, hood/trunk latch-
ing, and shift selector position. Two-wire unipolar switches, such as the A1145
and A1146, are particularly advantageous in price-sensitive applications because
they require one less wire for operation than do switches with the more traditional
open-collector output. Additionally, the system designer inherently gains diagnos-
tics because there is always output current flowing, which should be in either of
two narrow ranges. Any current level not within these ranges indicates a fault con-
dition. These devices also feature on-chip transient protection and a Zener clamp
to protect against overvoltage conditions on the supply line.
The output currents of the A1146 switches HIGH in the presence of a south (+)
polarity magnetic field of sufficient strength, and switches LOW otherwise, as in
the presence of a weak field or a north () polarity field. The A1145 has an oppo-
site output: the currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-23W, miniature
low-profile package for surface-mount applications. The UA is a three-lead ultra-
mini SIP for through-hole mounting. Each package is available in a lead (Pb) free
version (suffix, T) with 100% matte tin plated leadframe. Field-programmable
versions also available: A1185 and A1186.
Package UA, 3-pin SIP
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low sensitivity to stress
Factory programmed at end-of-line for
optimized switchpoints
1:1
1:1
2
A1145-DS, Rev. 6
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1145 and A1146
Product Selection Guide
Use the complete part numbers when ordering
Part Number
Pb-Free
Packing
1
Package
Operating Ambient
Temperature, T
A
(C)
Output Level in
South (+) Field
2
A1145ELHLT
Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 85
Low
A1145ELHLT-T
Yes
A1145EUA
Bulk Bag, 500 pieces/bag
Through Hole
A1145EUA-T
Yes
A1145EUATI
Tape and Reel, 2000 pieces/reel
A1145EUATI-T
Yes
A1145LLHLT
Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 150
A1145LLHLT-T
Yes
A1145LUA
Bulk Bag, 500 pieces/bag
Through Hole
A1145LUA-T
Yes
A1145LUATI
Tape and Reel, 2000 pieces/reel
A1145LUATI-T
Yes
A1146ELHLT
3
Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 85
High
A1146ELHLT-T
Yes
A1146EUA
3
Bulk Bag, 500 pieces/bag
Through Hole
A1146EUA-T
Yes
A1146EUATI
Tape and Reel, 2000 pieces/reel
A1146EUATI-T
Yes
A1146LLHLT
Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 150
A1146LLHLT-T
Yes
A1146LUA
Bulk Bag, 500 pieces/bag
Through Hole
A1146LUA-T
Yes
A1146LUATI
Tape and Reel, 2000 pieces/reel
A1146LUATI-T
Yes
1
Contact Allegro for additional packing options.
2
South (+) magnetic fields must be of sufficient strength.
3
These variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is
currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the
near future is probable. Samples are no longer available. Status date change May 2, 2005.
3
A1145-DS, Rev. 6
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1145 and A1146
NC
1
2
3
Functional Block Diagram
Amp
Regulator
Low-Pass
Filter
GND
VCC
GND
Package UA Only
0.01 uF
V+
Clock/Logic
Dyna
mic
O
ffse
t
Ca
nce
ll
a
t
i
o
n
Sam
p
le
and
H
old
To All Subcircuits
1. VCC
2. No connection
3. GND
1
2
3
1. VCC
2. GND
3. GND
Package LH, 3-pin SOT
Package UA, 3-pin SIP
4
A1145-DS, Rev. 6
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1145 and A1146
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
1
V
CC
3.5
24
V
Supply Current
2
I
CCL
B > B
OP
for A1145; B < B
RP
for A1146
5
6.9
mA
I
CCH
B > B
OP
for A1146; B < B
RP
for A1145
12
17
mA
Reverse Supply Current
I
RCC

V
RCC
= 18 V
1.6
mA
Supply Zener Clamp Voltage
V
ZSUPPLY
I
CC
= I
CCL(max)
+ 3 mA; T
A
= 25C
28
40
V
Supply Zener Clamp Current
3
I
ZSUPPLY
V
ZSUPPLY
= 28 V
9.9
mA
Output Slew Rate
4
di/dt
Capacitance of the oscilloscope performing
the measurement = 20 pF
36
mA/s
Chopping Frequency
f
C
200
kHz
Power-On Time
5
t
on
C
BYPASS
= 0.01 F
25
s
Power-On State
6,7
POS
t < t
on
;
V
CC
slew rate > 25 mV/s
HIGH
1
V
CC
represents the generated voltage between the VCC pin and the GND pin.
2
Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
3
I
ZSUPPLY(max)
= I
CCL(max)
+ 3 mA.
4
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5
Measured with and without bypass capacitor of 0.01 F. Adding a larger bypass capacitor causes longer Power-On Time.
6
POS is defined as true only with a V
CC
slew rate of 25 mV / s or greater. Operation with a V
CC
slew rate less than 25 mV / s can permanently harm
device performance.
7
POS is undefined for t > t
on
or B
RP
< B < B
OP
.
MAGNETIC CHARACTERISTICS
over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.*
Max.
Units
Operate Point
B
OP
A1145 I
CC
= I
CCL
20
37
60
G
A1146 I
CC
= I
CCH
Release Point
B
RP
A1145 I
CC
= I
CCH
10
22
55
G
A1146 I
CC
= I
CCL
Hysteresis
B
HYS
B
HYS
= B
OP
B
RP
5
15
30
G
*Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as T
A
= 25C and V
CC
= 12 V.
Performance may vary for individual units, within the specified maximum and minimum limits.
5
A1145-DS, Rev. 6
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1145 and A1146
Characteristic Data
Supply Current (High) versus Ambient Temperature
at Various Levels of V
CC
(A1145 and A1146)
Supply Current (Low) versus Ambient Temperature
at Various Levels of V
CC
(A1145 and A1146)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
V
CC
3.5 V
12.0 V
24.0 V
V
CC
3.5 V
12.0 V
24.0 V
I
CCL
(mA)
I
CCH
(mA)
0
2
6
8
10
4
50
0
50
100
150
200
50
0
50
100
150
200
50
0
50
100
150
200
Switchpoint Hysteresis versus Ambient Temperature
at Various Levels of V
CC
(A1145 and A1146)
Operate Point versus Ambient Temperature
at Various Levels of V
CC
(A1145 and A1146)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
V
CC
3.5 V
12.0 V
24.0 V
V
CC
3.5 V
12.0 V
24.0 V
B
OP
(G)
B
HYS
(G)
0
10
20
30
50
60
70
40
10
12
16
18
20
14
50
0
50
100
150
200
5
0
10
15
25
30
40
35
20