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A1260
Chopper-Stabilized Precision Vertical Hall-Effect Latch
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Magnetic sensing parallel to surface of the package
• Highly sensitive switch thresholds
• Symmetrical latch switch points
• Operation from unregulated supply down to 3 V
• Small package sizes
• Automotive grade
□Output short-circuit protection
□Resistant to physical stress
□Reverse-battery protection
□Solid-state reliability
□Superior temperature stability
□Supply voltage Zener clamp
PACKAGES:
3-Pin SOT23-W
(Suffix LH)
3-Pin SIP
(Suffix UA)
Not to scale
DESCRIPTION
The A1260 vertical Hall-effect sensor IC is an extremely
temperature-stable and stress-resistant magnetic-sensing
device ideal for harsh operating environments. The sensor
is actuated by alternating north and south polarity magnetic
fields in plane with the device’s branded face. Two package
options, the SOT23W surface-mount and SIP through-hole,
allow sensing in a variety of orientations with respect to the
mounting position. 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,
a Hall-voltage generator, a small-signal amplifier, chopper
stabilization, a Schmitt trigger, and a short-circuit protected
NMOS output to sink up to 25 mA. The on-board 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 3.3 V applications, while allowing additional external
resistance in series with the supply pin for greater protection
against high-voltage transient events.
The output is turned on when a south pole of sufficient strength
perpendicular to the vertical Hall element is present. A north
pole is necessary to turn the output off. Package type LH is a
modified SOT23W surface-mount package that switches with
magnetic fields oriented perpendicularly to the non-leaded side
of the package. The UA package is an ultra-mini SIP, equipped
Continued on next page...
VCC
Vertical
Hall
Hall
Amp
Regulator
To All Subcircuits
Sample, Hold,
& Averaging
Low-Pass
Filter
Control
Current
Limit
VOUT
A1260-DS, Rev. 2
Functional Block Diagram
GND

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A1260
Chopper-Stabilized Precision
Vertical Hall-Effect Latch
DESCRIPTION (continued)
for through-hole mounting and lead forming, that switches when a
magnetic field is presented to the top of the package, parallel with
the branded face. Both packages are RoHS-compliant and lead (Pb)
free (suffix, -T), with 100% matte-tin-plated leadframes.
SPECIFICATIONS
Selection Guide
Part Number
Packing
A1260ELHLT-T
7-in. reel, 3000 pieces/reel
A1260ELHLX-T
13-in. reel, 10000 pieces/reel
A1260LLHLT-T
7-in. reel, 3000 pieces/reel
A1260LLHLX-T
13-in. reel, 10000 pieces/reel
A1260EUA-T1
500 pieces per bulk bag
A1260LUA-T1
500 pieces per bulk bag
1 Please contact Allegro for availability.
Package
3-pin surface mount SOT23W
3-pin surface mount SOT23W
3-pin surface mount SOT23W
3-pin surface mount SOT23W
SIP-3 through hole
SIP-3 through hole
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
VCC
VRCC
VOUT
IOUT
IOUTR
TA
TJ(MAX)
TS
Range E
Range L
Notes
Pin-Out Diagrams and Terminal List Table
Ambient, TA (°C)
-40 to 85
-40 to 85
-40 to 150
-40 to 150
-40 to 85
-40 to 150
Rating
26.5
-18
26
25
-50
-40 to 85
-40 to 150
165
-65 to 170
Unit
V
V
V
mA
mA
°C
°C
°C
°C
3
VH
12
Package LH Pin-Out
VH
123
Terminal List Table
Symbol
Pin Number
LH UA
Package Package
VCC
1
1
VOUT
2
3
GND
3
2
Description
Power Supply to Chip
Output from Circuit
Ground
Package UA Pin-Out
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2

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A1260
Chopper-Stabilized Precision
Vertical Hall-Effect Latch
ELECTRICAL CHARACTERISTICS: valid over full operating voltage and temperature ranges (unless otherwise specified)
Characteristics
Symbol
Test Conditions
Min.
Typ.1
Max.
Unit2
Supply Voltage
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time 3
VCC
IOUTOFF
VOUT(SAT)
IOM
tPO
Operating, TJ < 165°C
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
B > BOP
VCC > 3.0 V, B < BRP(MIN) – 10 G, B > BOP(MAX)
+ 10 G
3
30
– 24 V
– 10 µA
230 500 mV
– 60 mA
– 25 µs
Chopping Frequency
Output Rise Time 3,4
Output Fall Time 3,4
Supply Current
Reverse Battery Current
Supply Zener Clamp Voltage
Zener Impedance
fC
tr
tf
ICC
IRCC
VZ
IZ
RL = 820 Ω, CS = 20 pF
RL = 820 Ω, CS = 20 pF
VRCC = -18 V
ICC = 5 mA; TA = 25°C
ICC = 5 mA; TA = 25°C
– 800 – kHz
– 0.2 2 µs
– 0.1 2 µs
– 2.5 4 mA
– – –5 mA
28 34 – V
– 50 – Ω
MAGNETIC CHARACTERISTICS: valid over full operating voltage and temperature ranges (unless otherwise specified)
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit2
Operate Point
BOP
5 25 50 G
Release Point
BRP
–50 –25
–5
G
Hysteresis
BHYS
BOP - BRP
20 50 80 G
N
S
N
S
Z
1A
Z
1B
Figure 1: Magnet Orientation for Switching Output On for LH package (Panel 1A) and UA Package (Panel 1B)
1 Typical data is at TA = 25ºC and VCC = 12 V and it is for design information only
2 1 G (gauss) = 0.1 mT (millitesla).
3 Power on time, Rise time and Fall time are guaranteed through device characterization
4 CS = oscilloscope probe capacitance.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3