High Precision Hall Effect AC-Coupled Differential
Sensor IC with Integrated Filter Capacitor
A1421, A1422,
and A1423
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Each device includes: a voltage regulator, two Hall transduc-
ers, temperature compensating circuitry, a low-level ampli-
fier, bandpass filter, Schmitt trigger, and an output driver. The
on-board regulator permits operation with supply voltages from
4.0 to 26.5 V. The output stage can switch 20 mA over the full
frequency response range of the device, and is compatible with
CMOS logic circuits.
The devices in this family differ from each other in their
switchpoint specifications and their switching polarity. The
A1421 has a small hysteresis and asymmetrical switchpoints,
with one switchpoint at the zero-crossing. The A1422 has a small
hysteresis and symmetrical switchpoints, both near the zero-
crossing. The A1423 offers high vibration immunity, by means
of its larger hysteresis that establishes symmetrical switchpoints
Pin-out Diagram
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating Units
Supply Voltage
V
CC
Refer to Power Derating section
28
V
Reverse Supply Voltage
V
RCC
18
V
Output Current
I
OUT
25
mA
Reverse-Output Current
I
ROUT
50
mA
Operating Ambient Temperature
T
A
Range L
40 to 150 篊
Maximum Junction Temperature
T
J(max)
165
篊
Storage Temperature
T
stg
65 to 170 篊
Terminal List Table
Number Name
1
VCC
2
VOUT
3
TEST
4
GND
Description (continued)
Product Selection Guide
Part Number
Output Switching
at B
DIFF
= 0
Switchpoints
Symmetry
Packing
*
B
Diff
Increasing
B
Diff
Decreasing
B
OP(typ)
(G)
B
RP(typ)
(G)
B
OP(max)
+
B
RP(min)
(G)
B
OP(typ)
+
B
RP(typ)
(G)
B
OP(min)
+
B
RP(max)
(G)
A1421LK-T
Low (On) to
High (Off)
High (Off) to
Low (On)
15
0
15
15
7.5
Bulk, 500
pieces/bag
A1422LK-T
High (Off) to
Low (On)
Low (On) to
High (Off)
15
15
0
0
0
A1423LK-T
High (Off) to
Low (On)
Low (On) to
High (Off)
65
65
0
0
0
*
Contact Allegro for additional packing options.
2
3 4
1
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