A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Features and Benefits
▪ Two matched Hall effect switches on a single substrate
▪ Sensor Hall element spacing approximately 1 mm
▪ Superior temperature stability
▪ 3.3 to 18 V operation
▪ Integrated ESD diode from OUTPUT and VCC pins
to GND
▪ High-sensitivity switchpoints
▪ Robust structure for EMC protection
▪ Solid-state reliability
Package: 8 pin SOIC (suffix L), and 4 pin
SIP (suffix K)
Description
The A3425 is a dual–output-channel, bipolar switch with
each channel comprising a separate complete Hall-effect
sensor circuit with dedicated Hall element and separate digital
output for speed and direction signal processing capability. The
independent Hall elements (E1 integrated with OUTPUTA, and
E2 integrated with OUTPUTB) are photolithographically aligned
to better than 1 μm. Maintaining this accurate mechanical
location between the two active Hall elements eliminates the
major manufacturing hurdle encountered in fine-pitch detection
applications. The A3425 is a highly sensitive, temperature-stable
magnetic sensing device, which is ideal for use in ring magnetbased speed and direction systems used in harsh automotive
and industrial environments.
The A3425 contains two independent Hall effect switches, and
has a monolithic IC that accurately locates the two Hall elements,
E1 and E2, approximately 1 mm apart. The digital outputs are
90º out of phase so that the outputs are in quadrature, with the
proper ring magnet design. This allows for easy processing of
speed and direction signals. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
Not to scale
V
Supply
Continued on the next page…
T ypical Application
100 Ω
0.1 uF
Using unregulated supply
VOUTPUTB
VOUTPUTA
2
OUTPUTA
A3425
1
VCC
GND
OUTPUTB
4
3
A3425DS-Rev. 7
Ultra-Sensitive Dual-Channel Quadrature
A3425
Description (continued)
quadrature. The patented chopper stabilization technique cancels
offsets in each channel, and provides stable operation over the
operating temperature and voltage ranges. An on-chip regulator
allows the use of this device over a wide operating voltage range.
Post-assembly factory programming provides sensitive switchpoints
Selection Guide
Part Number Packing
A3425EK-T Bulk, 500 pieces/bag
A3425EKTN-T 13-in. reel, 4000 pieces/reel
A3425EL-T Bulk, 500 pieces/bag
A3425ELTR-T 13-in. reel, 3000 pieces/reel
A3425LK-T Bulk, 98 pieces/bag
A3425LKTN-T 13-in. reel, 4000 pieces/reel
A3425LL-T Bulk, 500 pieces/bag
A3425LLTR-T 13-in. reel, 3000 pieces/reel
*
Contact Allegro for additional packing options.
*
4-pin SIP through hole
8-pin SOIC surface mount
4-pin SIP through hole
8-pin SOIC surface mount
Hall-Effect Bipolar Switch
that are symmetrical between the two switches.
The A3425 is available in a plastic 8-pin SOIC surface mount
package (L) and a plastic 4-pin SIP (K), both in two operating
temperature ranges. Each package is available in a lead (Pb) free
version with 100% matte tin plated leadframe.
Mounting Ambient, T
–40ºC to 85ºC
–40ºC to 150ºC
A
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
Reverse Battery Voltage V
Output Off Voltage V
Output Sink Current I
Magnetic Flux Density B Unlimited –
Operating Ambient Temperature T
Maximum Junction Temperature TJ(max) 165 ºC
Storage Temperature T
CC
RCC
OUTPUT
OUTPUT(Sink)
A
stg
Range E –40 to 85 ºC
Range L –40 to 150 ºC
26.5 V
–16 V
V
CC
Internally Limited –
–65 to 170 ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
V
2
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Functional Block Diagram
VCC
Channel A
Hall
Element
E1
Channel B
Hall
Element
E2
Programmable
Tri m
8 Bits
4 Bits
lation
Amp
Cancel
Dynamic Offset
lation
Amp
Cancel
Dynamic Offset
LowPass
Filter
Sample and Hold
4 Bits
LowPass
Filter
Sample and Hold
Regulator
Output
Output
OUTPUTA
Drive
OUTPUTB
Drive
E1
E2
1 2 3 4
GND
Terminal List Table
Package LPackage K
1
2
3
4
8
E1
7
6
E2
5
Pin Number
Package K Package L
Name Function
1 1 VCC Connects power supply to on-chip voltage regulator
2 2 OUTPUTA Output from E1 via fi rst Schmitt circuit
3 3 OUTPUTB Output from E2 via second Schmitt circuit
4 4 GND Terminal for ground connection
– 5-8 NC No connection
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
Ultra-Sensitive Dual-Channel Quadrature
A3425
Hall-Effect Bipolar Switch
OPERATING CHARACTERISTICS Valid over operating temperature ranges unless otherwise noted; typical data applies to
= 12 V, and TA = 25ºC
V
CC
Characteristic Symbol Test Conditions Min. Typ. Max Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
1
Output Leakage Current I
Output Rise Time t
Output Fall Time t
Supply Current
Low Output Voltage V
Output Sink Current I
Output Sink Current, Continuous
Output Sink Current, Peak
2
3
Chopping Frequency f
TRANSIENT PROTECTION CHARACTERISTICS
V
CC
OUTPUT(OFF)
r
f
I
CC(OFF)
I
CC(ON)
OUTPUT(ON)
OUTPUT(SINK)
I
OUTPUT(SINK)CTJ
I
OUTPUT(SINK)P
C
Operating; TA 150°C 3.3 – 18 V
Either output – < 1 10 A
C
= 20 pF, R
LOAD
C
= 20 pF, R
LOAD
B < B
B > B
RP(A)
OP(A)
,B < B
,B > B
Both outputs; I
OP(B)
B > B
= 820 – 1.8 – s
LOAD
= 820 – 1.2 – s
LOAD
RP(B)
OP(B)
OUTPUT(SINK)
= 20 mA; B > B
OP(A)
– 3.5 6.0 mA
– 4.0 6.0 mA
,
– 160 500 mV
– – 20 mA
< T
J(max)
,V
= 12 V – – 70 mA
OUTPUT
t < 3 seconds – – 220 mA
– 340 – kHz
Supply Zener Voltage V
Supply Zener Current
4
Reverse-Battery Current I
Continued on the next page...
I
Z
RCC
Z
ICC = 15 mA 28 33 37 V
VS = 28 V – – 9.0 mA
V
= –18 V, TJ < T
RCC
J(max)
– 2 15 mA
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
Ultra-Sensitive Dual-Channel Quadrature
A3425
Hall-Effect Bipolar Switch
OPERATING CHARACTERISTICS (continued) Valid over operating temperature ranges unless otherwise noted; typical
data applies to V
Characteristic Symbol Test Conditions Min. Typ. Max Units
MAGNETIC CHARACTERISTICS, K Package
= 12 V, and TA = 25ºC
CC
5
Operate Point: B > B
Release Point: B < B
Hysteresis: B
B
OP(B)
– B
OP(A)
RP(B)
– B
OP
RP
RP(A)
,
Symmetry: Channel A, Channel B,
B
Operate Symmetry: B
Release Symmetry: B
OP(A)
+ B
RP(A), BOP(B)
OP(A)
RP(A)
+ B
– B
– B
RP(B)
OP(B)
RP(B)
MAGNETIC CHARACTERISTICS, L Package
Operate Point: B > B
Release Point: B < B
Hysteresis: B
B
OP(B)
– B
OP(A)
RP(B)
– B
OP
RP
RP(A)
,
Symmetry: Channel A, Channel B,
B
Operate Symmetry: B
Release Symmetry: B
1
When operating at maximum voltage, never exceed maximum junction temperature, T
2
Device will survive the current level specifi ed, but operation within magnetic specifi cation cannot be guaranteed.
3
Short circuit of the output to VCC is protected for the time duration specifi ed.
4
Maximum specifi cation limit is equivalent to I
5
Magnetic fl ux density, B, is indicated as a negative value for north-polarity magnetic fi elds, and as a positive value for south-polarity
OP(A)
+ B
RP(A), BOP(B)
OP(A)
RP(A)
+ B
– B
– B
RP(B)
OP(B)
RP(B)
B
, B
OP(A)
B
, B
RP(A)
B
, B
HYS(A)
SYMA, SYM
SYM
AB(OP)
SYM
AB(RP)
5
B
, B
OP(A)
B
, B
RP(A)
B
, B
HYS(A)
SYMA, SYM
SYM
AB(OP)
SYM
AB(RP)
CC(max)
OP(B)
RP(B)
HYS(B)
OP(B)
RP(B)
HYS(B)
B
B
+ 3 mA.
– 7 35 G
–35 –7 – G
51640 G
–40 – 40 G
–30 – 30 G
–30 – 30 G
– 7 30 G
–30 –7 – G
51435 G
–35 – 35 G
–25 – 25 G
–25 – 25 G
. Refer to power derating curve charts.
J(max)
magnetic fi elds. This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the
relative strength of the fi eld is indicated by the absolute value of B, and the sign indicates the polarity of the fi eld (for example, a
–100 G fi eld and a 100 G fi eld have equivalent strength, but opposite polarity).
EMC
Contact Allegro MicroSystems for EMC performance.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5
Ultra-Sensitive Dual-Channel Quadrature
A3425
Hall-Effect Bipolar Switch
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions* Value Units
Package K, 1-layer PCB with copper limited to solder pads 177 ºC/W
Package Thermal Resistance
*Additional thermal data available on the Allegro Web site.
R
θJA
Package L-8 pin, 1-layer PCB with copper limited to solder pads 140 ºC/W
Package L-8 pin, 4-layer PCB based on JEDEC standard 80 ºC/W
Power Derating Curve
20
19
18
17
(V)
16
15
CC
14
13
12
11
10
9
8
7
6
5
4
Maximum Allowable V
3
2
20 40 60 80 100 120 180140 160
Package L, 4-layer PCB
(R
= 80 ºC/W)
θJA
Package L, 1-layer PCB
(R
= 140 ºC/W)
θJA
Package K, 1-layer PCB
(R
= 177 ºC/W)
θJA
Temperature (ºC)
V
CC(max)
V
CC(min)
Power Dissipation versus Temperature
1900
1800
1700
1600
1500
1400
(mW)
D
Power Dissipation, P
1300
1200
1100
1000
900
800
700
600
500
400
300
Package K, 1-l
(R
θJA
(R
PackageL,1
(R
θ
JA
=
140 ºC/W)
=17
7 ºC/W)
Pa
ckage L, 4-layer PCB
θJA
=80ºC/W)
-
l
a
yer PCB
a
yer P
CB
200
100
0
20 40 60 80 100 120 140 160 180
Temperature, TA(°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
6
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Functional Description
Chopper-Stabilized Technique
When using Hall effect technology, a limiting factor
for switchpoint accuracy is the small signal voltage
developed across the Hall element. This voltage is disproportionally small relative to the offset that can be
produced at the output of the Hall device. This makes
it diffi cult to process the signal and maintain an accu-
rate, reliable output over the specifi ed temperature and
voltage range.
Chopper stabilization is a unique approach used to
minimize Hall offset on the chip. The patented Allegro
technique, dynamic quadrature offset cancellation,
removes key sources of the output drift induced by
thermal and mechanical stress. This offset reduction
technique is based on a signal modulation-demodulation process. The undesired offset signal is separated
from the magnetically induced signal in the frequency
domain through modulation. The subsequent demodulation acts as a modulation process for the offset,
causing the magnetically-induced signal to recover its
original spectrum at the baseband level, while the dc
offset becomes a high-frequency signal. Then, using a
low-pass fi lter, the signal passes while the modulated
dc offset is suppressed.
The chopper stabilization technique uses a 170 kHz
high-frequency clock. The Hall element chopping
occurs on each clock edge, resulting in a 340 kHz
chop frequency. This high-frequency operation allows
for a greater sampling rate, which produces higher
accuracy and faster signal processing capability. This
approach desensitizes the chip to the effects of thermal and mechanical stress. The disadvantage to this
approach is that jitter, also known as 360° repeatability,
can be induced on the output signal. The sample-and-
hold process, used by the demodulator to store and
recover the signal, can slightly degrade the signalto-noise ratio. This is because the process generates
replicas of the noise spectrum at the baseband, causing
a decrease in jitter performance. However, the improvement in switchpoint performance, resulting from the
reduction of the effects of thermal and mechanical
stress, outweighs the degradation in the signal-to-noise
ratio.
This technique produces devices that have an
extremely stable quiescent Hall element output voltage, are immune to thermal stress, and have precise
recoverability after temperature cycling. This technique is made possible through the use of a BiCMOS
process, which allows the use of low-offset and lownoise amplifi ers in combination with high-density
logic integration and sample-and-hold circuits. This
process is illustrated in the following diagram.
Regulator
Amp
Chopper stabilization circuit (dynamic quadrature offset cancellation)
LowPass
Filter
Sample andHold
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
7
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Typical Applications Operation
Channel A
Magne tic Field
at Hall Element E1
V+
V
OUTPUT(OFF)
OUTPUT
V
Switch to Low
Switch to High
V
OUTPUT(ON)(sat)
B
OP
RP
B
B
HYS
B+
Output voltage in relation to sensed magnetic fl ux density.
Output on each channel independently follows the same
pattern of transition through B
through B
RP
.
followed by transition
OP
Channel B
Magne tic Field
at Hall Element E2
Channel A
Output Signal
at OUTPUTA
Channel B
Output Signal
at OUTPUTB
Quadrature output signal confi guration. The outputs of the two
output channels have a phase difference of 90º when used
with a properly designed magnet that has an optimal pole pitch
of twice the Hall element spacing of 1.0 mm.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Typical Applications Circuits
This device requires minimal protection circuitry
during operation with a low-voltage regulated line.
The on-chip voltage regulator provides immunity
to power supply variations between 3.3 and 18 V.
Because the device has open-drain outputs, pull-up
resistors must be included.
If protection against coupled and injected noise is
required, then a simple low-pass fi lter on the supply
(RC) and a fi ltering capacitor on each of the outputs
may also be needed, as shown in the unregulated
supply diagram.
For applications in which the device receives its power
from unregulated sources, such as a car battery, full
V
Supply
protection is generally required to protect the device
against supply-side transients. Specifi cations for such
transients vary for each application, so the design of
the protection circuit should be optimized for each
application.
For example, the circuit shown in the unregulated
supply diagram includes a Zener diode that offers high
voltage load-dump protection and noise fi ltering by
means of a series resistor and capacitor. In addition, it
includes a series diode that protects against high-volt-
age reverse battery conditions.
VOUTPUTB
VOUTPUTA
2
OUTPUTA
A3425
1
VCC
OUTPUTB
3
GND
0.1 uF
4
Regulated supply
VOUTPUTB
VOUTPUTA
2
OUTPUTA
V
Supply
100 Ω
0.1 uF
A3425
1
VCC
GND
OUTPUTB
4
3
Unregulated supply
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
9
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Typical Thermal Performance
The device must be operated below the maximum junction
temperature of the device, T
. Under certain combinations of
J(max)
peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, R
, is a fi gure of merit sum-
θJA
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, R
relatively small component of R
. Ambient air temperature,
θJA
θJC
, is
TA, and air motion are signifi cant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
PD = VIN × I
ΔT = PD × R
IN
θJA
(2)
(1)
TJ = TA + ΔT (3)
Example: Reliability for VCC at TA = 150°C, package L, using
minimum-K PCB
Observe the worst-case ratings for the device, specifi cally:
R
140 °C/W, T
θJA =
I
CC(max) = 6
mA.
Calculate the maximum allowable power level, P
J(max) =
165°C, V
CC(max) = 18
V, and
D(max)
. First,
invert equation 3:
ΔT
max
= T
– TA = 165 °C – 150 °C = 15 °C
J(max)
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
P
D(max)
= ΔT
max
÷ R
= 15°C ÷ 140 °C/W = 107 mW
θJA
Finally, invert equation 1 with respect to voltage:
V
CC(est)
= P
D(max)
÷ I
= 107 mW ÷ 6 mA = 18 V
CC(max)
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤V
Compare V
able operation between V
R
. If V
θJA
V
is reliable under these conditions.
CC(max)
CC(est)
CC(est)
to V
≥ V
. If V
CC(max)
CC(est)
CC(max)
CC(est)
and V
CC(max)
, then operation between V
≤ V
CC(max)
requires enhanced
.
CC(est)
, then reli-
CC(est)
and
For example, given common conditions such as: TA= 25°C,
V
= 12 V, I
CC
PD = VCC × I
ΔT = P
T
= TA + ΔT = 25°C + 7°C = 32°C
J
A worst-case estimate, P
able power level (V
at a selected R
= 4 mA, and R
CC
CC
× R
D
θJA
and TA.
θJA
= 140 °C/W, then:
θJA
= 12 V × 4 mA = 48 mW
= 48 mW × 140 °C/W = 7°C
, represents the maximum allow-
D(max)
CC(max)
, I
), without exceeding T
CC(max)
J(max)
,
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
10
A3425
I
CC(off)
0
1
2
3
4
5
6
7
8
-50 0 50 100 150 200
Temperature (°C)
Current (mA)
3.3 V
18 V
0
1
2
3
4
5
6
7
8
0 5 10 15 20
VCC (V)
Current (mA)
-40°C
25°C
150°C
I
CC(on)
0
1
2
3
4
5
6
7
8
-50 0 50 100 150
200
Temperature (°C)
Current (mA)
3.3 V
18 V
0
1
2
3
4
5
6
7
8
0 5 10 15 20
VCC (V)
Current (mA)
-40°C
25°C
150°C
VCC = 3.3 V, I
sink
= 20 mA
0
100
200
300
400
500
-50 0 50 100 150 200
Ch. A
Ch. B
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Electrical Operating Characteristics, Package L
I
CC(off)
I
CC(on)
Vsat (mV)
Output Satur ation Voltage
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11
A3425
Channel A, BOP and B
RP
-30
-20
-10
0
10
20
30
0 5 10 15 20
Switchpoint (G)
-40°C
25°C
150°C
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Switchpoint
(G)
3.3 V
12 V
18 V
Channel B, BOP and B
RP
-30
-20
-10
0
10
20
30
0 5 10 15 20
Switchpoint
(G)
-40°C
25°C
150°C
Channel B, BOP and B
RP
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Switchpoint
(G)
3.3 V
12 V
18 V
Channels A and B, Hysteresis
0
5
10
15
20
25
30
0 5 10 15 20
B
OP
- B
RP
(G)
-40°C
25°C
150°C
Channels A and B, Hysteresis
0
5
10
15
20
25
30
-50 0 50 100 150 200
B
OP
- B
RP
(G)
3.3 V
12 V
18 V
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package L
B
OP
B
RP
VCC (V)
B
OP
B
RP
Channel A, BOP and B
B
OP
B
RP
Temperature (°C)
B
OP
B
RP
RP
VCC (V)
Additional magnetic characteristics on next page
VCC (V)
Temperature (°C)
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
12
A3425
BOP Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
Ch. A - Ch. B (G)
-40°C
25°C
150°C
BOP Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
Ch. A - Ch. B (G)
3.3 V
12 V
18 V
BRP Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
Ch. A - Ch. B (G)
-40°C
25°C
150°C
BRP Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
Ch. A - Ch. B (G)
3.3 V
12 V
18 V
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package L (continued)
Additional magnetic characteristics on next page
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
13
A3425
Channel A Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
B
OP
+ B
RP
(G)
-40°C
25°C
150°C
Channel A Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
B
OP
+ B
RP
(G)
3.3 V
12 V
18 V
Channel B Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
B
OP
+ B
RP
(G)
-40°C
25°C
150°C
Channel B Symmetry
Temperature (°C)
B
OP
+ B
RP
(G)
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package L (continued)
30
20
10
0
-10
-20
-30
-50 0 50 100 150 200
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3.3 V
12 V
18 V
14
A3425
I
CC(off)
0
1
2
3
4
5
6
7
8
-50 0 50 100 150 200
Temperature (°C)
Current (mA)
3.3 V
18 V
0
1
2
3
4
5
6
7
8
0 5 10 15 20
VCC (V)
Current (mA)
-40°C
25°C
150°C
I
CC(on)
0
1
2
3
4
5
6
7
8
-50 0 50 100 150
200
Temperature (°C)
Current (mA)
3.3 V
18 V
0
1
2
3
4
5
6
7
8
0 5 10 15 20
VCC (V)
Current (mA)
-40°C
25°C
150°C
VCC = 3.3 V, I
sink
= 20 mA
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Electrical Operating Characteristics, Package K
I
CC(off)
I
CC(on)
Output Satur ation Voltage
500
400
300
200
Vsat (mV)
100
0
-50 0 50 100 150 200
Temperature (
°
C)
Ch. A
Ch. B
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
15
A3425
Channel A, BOP and B
RP
-30
-20
-10
0
10
20
30
0 5 10 15 20
Switchpoint (G)
-40°C
25°C
150°C
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Switchpoint
(G)
3.3 V
12 V
18 V
Channel B, BOP and B
RP
-30
-20
-10
0
10
20
30
0 5 10 15 20
Switchpoint
(G)
-40°C
25°C
150°C
Channel B, BOP and B
RP
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Switchpoint
(G)
3.3 V
12 V
18 V
Channels A and B, Hysteresis
0
5
10
15
20
25
30
0 5 10 15 20
B
OP
- B
RP
(G)
-40°C
25°C
150°C
Channels A and B, Hysteresis
0
5
10
15
20
25
30
-50 0 50 100 150 200
B
OP
- B
RP
(G)
3.3 V
12 V
18 V
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package K
Channel A, BOP and B
B
OP
B
RP
VCC (V)
B
OP
B
OP
B
RP
Temperature (°C)
B
OP
RP
B
RP
B
RP
VCC (V)
Additional magnetic characteristics on next page
VCC (V)
Temperature (°C)
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
16
A3425
BOP Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
Ch. A - Ch. B (G)
-40°C
25°C
150°C
BOP Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
Ch. A - Ch. B (G)
3.3 V
12 V
18 V
BRP Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
Ch. A - Ch. B (G)
-40°C
25°C
150°C
BRP Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
Ch. A - Ch. B (G)
3.3 V
12 V
18 V
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package K (continued)
Additional magnetic characteristics on next page
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
17
A3425
Channel A Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
B
OP
+ B
RP
(G)
-40°C
25°C
150°C
Channel A Symmetry
-30
-20
-10
0
10
20
30
-50 0 50 100 150 200
Temperature (°C)
B
OP
+ B
RP
(G)
3.3 V
12 V
18 V
Channel B Symmetry
-30
-20
-10
0
10
20
30
0 5 10 15 20
VCC (V)
B
OP
+ B
RP
(G)
-40°C
25°C
150°C
Channel B Symmetry
Temperature (°C)
B
OP
+ B
RP
(G)
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Magnetic Operating Characteristics, Package K (continued)
30
20
10
0
-10
-20
-30
-50 0 50 100 150 200
3.3 V
12 V
18 V
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
18
A3425
.138
.133
3.51
3.38
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Package K, 4-pin SIP
5.28
.208
5.16
.203
.0394
1.00
D
NOM
.0828
2.10
D
NOM
.0520
.085
MAX
NOM
.045
MIN
1.32
D
E1
1.14
2.16
B
E2
A
.021
0.53
MAX
C
1.60
.063
1.50
.059
.033
0.84
NOM
15.24
.600
14.22
.560
2431
0.48
.019
0.36
.014
Dimensions in inches
Millimeters in brackets, forreference only
Case dimensions exclusive ofmold flash orgate burrs
Mold flash .010 [0.25]MAX, gate burr.008 [0.20]MAX, dambar protrusion.004 [0.10]MAX
Exact case and leadconfiguration at supplierdiscretion withinlimits shown
A
Dambar removal protrusion (8X)
B
Ejector mark on oppositeside
C
ActiveArea Depth .0165 [0.42] NOM
Hall elements E1, E2(not to scale)
D
.050
NOM
1.27
.017
.014
0.44
0.35
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
19
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Package L, 8-pin SOIC
6.20
.244
5.80
.228
A
4.00
3.80
M B
B
.157
.150
M
8º
C
0º
0.25
.010
0.17
.007
1.27
.050
0.40
.016
0.25 [.010]
5.00
.197
4.80
.189
D
1.96
.077
NOM
D
1.00
.039
NOM
D
1.96
.077
NOM
8
E1
A
E2
1.27 .050
21
0.25 .010
SEATING
PLANE
0.25
0.10
4.90
B
REF
1.27
REF
.193
.050
C
1.75
.069
1.35
.053
.010
.004
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC MS-012 AA)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A
Terminal #1 mark area
B
Reference pad layout (reference IPC SOIC127P600-8M);
adjust as necessary to meet application process requirements
C
Active Area Depth 0.40 [0.016]
D
Hall elements E1, E2 (not to scale), U.S. Customary
dimensions controlling
SEATING PLANE
GAUGE PLANE
1.40
.055
D
NOM
8X
8X
C0.10 [.004]
0.51
0.31
0.25 [.010]
0.65
MAX
.020
.012
2.50
REF
.026
M C A B
.098
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
20
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
The products described herein are manufactured under one
or more of the following U.S. patents: 5,045,920; 5,264,783;
5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319;
5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other
patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time
to time, such de par tures from the detail spec i fi ca tions as may be
required to permit improvements in the per for mance, reliability,
or manufacturability of its products. Before placing an order, the
user is cautioned to verify that the information being relied upon is
current.
Allegro products are not authorized for use as critical components in life-support devices or sys tems without express written
approval.
The in for ma tion in clud ed herein is believed to be ac cu rate and
reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other
rights of third parties which may result from its use.
Copyright © 2005, 2006, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
21
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