A1220, A1221, A1222, and A1223
Chopper Stabilized Precision Hall Effect Latches
Features and Benefits
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Symmetrical latch switchpoints
Resistant to physical stress
Superior temperature stability
Output short-circuit protection
Operation from unregulated supply down to 3 V
Reverse battery protection
Solid-state reliability
Small package sizes
Description
The A1220, A1221, A1222, and A1223 Hall-effect sensor ICs
are extremely temperature-stable and stress-resistant devices
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. 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-drain output
to sink up to 25 mA. A south pole of sufficient strength turns
the output on. A north pole of sufficient strength is necessary
to turn the output off.
An onboard regulator permits operation with supply voltages
of 3 to 24 V. The advantage of operating down to 3 V is that
the device can be used in 3-V applications or with additional
external resistance in series with the supply pin for greater
protection against high voltage transient events.
Packages:
Not to scale
3-pin SOT23W
(suffix LH)
(A1220
and 1221)
(A1222
and A1223)
3-pin SIP (suffix UA)
Two package styles provide magnetically optimized packages
for most applications. Package type LH is a modified 3-pin
SOT23W surface mount package while UA is a three-pin ultra-
mini SIP for through hole mounting. Both packages are lead
(Pb) free, with 100% matte tin plated leadframes.
Functional Block Diagram
VCC
Regulator
To All Subcircuits
Amp
Sample and Hold
Dynamic Offset
Cancellation
Low-Pass
Filter
VOUT
Control
Current Limit
GND
A1220-DS, Rev. 15
A1220, A1221,
A1222, and A1223
Chopper Stabilized Precision Hall Effect Latches
Selection Guide
Part Number
A1220ELHLX-T
A1220ELHLT-T
2
A1220EUA-T
A1220LLHLX-T
A1220LLHLT-T
2
A1220LUA-T
A1221ELHLX-T
A1221ELHLT-T
2
A1221EUA-T
A1221LLHLX-T
A1221LLHLT-T
2
A1221LUA-T
A1222ELHLT-T
A1222ELHLX-T
2
A1222EUA-T
A1222LLHLT-T
A1222LLHLX-T
2
A1222LUA-T
A1223ELHLT-T
A1223ELHLX-T
2
A1223EUA-T
A1223LLHLT-T
A1223LLHLX-T
2
A1223LUA-T
1
Contact Allegro
2
Available
Packing
1
13-in. reel, 10000 pieces/reel
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
13-in. reel, 10000 pieces/reel
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
13-in. reel, 10000 pieces/reel
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
13-in. reel, 10000 pieces/reel
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
13-in. reel, 10000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
13-in. reel, 10000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
13-in. reel, 10000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
13-in. reel, 10000 pieces/reel
Bulk, 500 pieces/bag
Mounting
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through hole
Ambient, T
A
–40ºC to 85ºC
B
RP
(Min)
B
OP
(Max)
–40
–40ºC to 150ºC
40
–40ºC to 85ºC
–90
–40ºC to 150ºC
90
–40ºC to 85ºC
–150
–40ºC to 150ºC
150
–40ºC to 85ºC
–180
–40ºC to 150ºC
180
for additional packing options.
through authorized Allegro distributors only.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A1220, A1221,
A1222, and A1223
Chopper Stabilized Precision Hall Effect Latches
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Output Off Voltage
Continuous Output Current
Reverse Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
OUT
I
OUT
I
ROUT
T
A
T
J
(max)
T
stg
Range E
Range L
Notes
Rating
26.5
–30
26
25
–50
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
V
mA
mA
ºC
ºC
ºC
ºC
Pin-out Diagrams
Package LH
GND
3
Package UA
1
VCC
2
VOUT
1
VCC
2
GND
3
VOUT
Terminal List
Name
VCC
VOUT
GND
Description
Connects power supply to chip
Output from circuit
Ground
Number
Package LH Package UA
1
1
2
3
3
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A1220, A1221,
A1222, and A1223
Chopper Stabilized Precision Hall Effect Latches
ELECTRICAL CHARACTERISTICS
Valid valid over full operating voltage and ambient temperature ranges; unless otherwise noted
Characteristics
Electrical Characteristics
Forward Supply Voltage
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
3
Chopping Frequency
Output Rise Time
3,4
Output Fall Time
3,4
Supply Current
Reverse Supply Current
Supply Zener Clamp Voltage
Zener Impedance
Magnetic Characteristics
A1220
Operate Point
B
OP
A1221
A1222
A1223
A1220
Release Point
B
RP
A1221
A1222
A1223
A1220
Hysteresis
B
HYS
A1221
A1222
A1223
1
Typical
2
1
Symbol
V
CC
I
OUTOFF
V
OUT(SAT)
I
OM
t
PO
f
C
t
r
t
f
I
CC(ON)
I
CC(OFF)
I
RCC
V
Z
I
Z
Test Conditions
Operating, T
J
< 165°C
V
OUT
= 24 V, B < B
RP
I
OUT
= 20 mA, B > B
OP
B > B
OP
V
CC
> 3.0 V, B < B
RP
(min) – 10 G,
B > B
OP
(max) + 10 G
R
L
= 820
Ω,
C
L
= 20 pF
R
L
= 820
Ω,
C
L
= 20 pF
B > B
OP
, V
CC
= 12 V
B < B
RP
, V
CC
= 12 V
V
RCC
= –30 V
I
CC
= 5 mA; T
A
= 25°C
I
CC
= 5 mA; T
A
= 25°C
Min.
3
–
–
30
–
–
–
–
–
–
–
28
–
5
15
70
100
–40
–90
–150
–180
10
30
140
200
Typ.
1
–
–
185
–
–
800
0.2
0.1
–
–
–
–
50
22
50
110
150
–23
–50
–110
–150
45
100
220
300
Max.
24
10
500
60
25
–
2
2
4
4
–5
–
–
40
90
150
180
–5
–15
–70
–100
80
180
300
360
Unit
2
V
μA
mV
mA
μs
kHz
μs
μs
mA
mA
mA
V
Ω
G
G
G
G
G
G
G
G
G
G
G
G
(B
OP
– B
RP
)
data are are at T
A
= 25°C and V
CC
= 12 V, and are for initial design estimations only.
G (gauss) = 0.1 mT (millitesla).
3
Guaranteed by device design and characterization.
4
C = oscilloscope probe capacitance.
L
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A1220, A1221,
A1222, and A1223
Chopper Stabilized Precision Hall Effect Latches
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
Package LH, 1-layer PCB with copper limited to solder pads
Package Thermal Resistance
R
θJA
Package LH, 2-layer PCB with 0.463 in.
2
of copper area each
side connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
Value Units
228
110
165
ºC/W
ºC/W
ºC/W
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
20
40
Power Derating Curve
T
J(max)
= 165ºC; I
CC
= I
CC(max)
V
CC(max)
Maximum Allowable V
CC
(V)
Package LH, 2-layer PCB
(R
JA
= 110 ºC/W)
Package UA, 1-layer PCB
(R
JA
= 165 ºC/W)
Package LH, 1-layer PCB
(R
JA
= 228 ºC/W)
V
CC(min)
60
80
100
120
140
160
180
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
Power Dissipation, P
D
(mW)
Pa
(R cka
ge
JA
= 1 LH
10 , 2-
Pac
ºC lay
/W er
(R kage
PC
)
UA
JA
=
B
, 1-
165
ºC/ layer
W)
PC
B
Pac
k
(R age LH
,1
JA
= 2
28 º -layer
PCB
C/W
)
40
60
80
100
120
Temperature (°C)
140
160
180
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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