Datasheet ACS706ELC-05C Datasheet (ALLEGRO)

Bidirectional 1.5 mΩ Hall Effect Based Linear Current Sensor

with Voltage Isolation and 15 A Dynamic Range

Package LC

Pin 8: VCC

Pin 7: VOUT

Pin 1: IP+

Pin 2: IP+

Pin 3: IP–

Pin 4: IP–

Pins 6 and 7 are internally connected in shipping
product. For compatibility with future devices,
leave pin 6 floating.

Nominal Operating Temperature, T

Range E............................................ –40 to 85ºC

Overcurrent Transient Tolerance*, I

*

100 total pulses, 250 ms duration each, applied at a rate of

1 pulse every 100 seconds.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC.......................................... 16 V

Reverse Supply Voltage, V
Output Voltage, V

........................................16 V

OUT

Reverse Output Voltage, V
Output Current Source, I
Output Current Sink, I

OUT(Sink)

Maximum Transient Sensed Current
Operating Temperature,
Maximum Junction, T
Storage Temperature, T

*

Junction Temperature, TJ < T

........................–16 V

RCC

......................–0.1 V

ROUT

OUT(Source)

.......................10 mA

....................... 165°C

J(max)

......................–65 to 170°C

S

.

J(max)

Pin 6: N.C.

Pin 5: GND

A

................ 60 A

P

................. 3 mA

*

, I

... 100 A

R(max)

ACS706ELC-05C

The Allegro ACS706 family of current sensors provides economical and
precise solutions for current sensing in industrial, automotive, commercial, and
communications systems. The device package allows for easy implementation
by the customer. Typical applications include motor control, load detection and
management, switched-mode power supplies, and overcurrent fault protection.

The device consists of a precision, low-offset linear Hall sensor circuit with
a copper conduction path located near the surface of the die. Applied current
flowing through this copper conduction path generates a magnetic field which is
sensed by the integrated Hall IC and converted into a proportional voltage. Device
accuracy is optimized through the close proximity of the magnetic signal to the
Hall transducer. A precise, proportional voltage is provided by the low-offset,
chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the
factory.

The output of the device has a positive slope (>V
flows through the primary copper conduction path (from pins 1 and 2, to pins 3
and 4), which is the path used for current sensing. The internal resistance of this
conductive path is typically 1.5 mΩ, providing low power loss. The thickness
of the copper conductor allows survival of the device at up to 5× overcurrent
conditions. The terminals of the conductive path are electrically isolated from the
sensor leads (pins 5 through 8). This allows the ACS706 family of sensors to be
used in applications requiring electrical isolation without the use of opto-isolators
or other costly isolation techniques.

The ACS706 is provided in a small, surface mount SOIC8 package. The leadframe
is plated with 100% matte tin, which is compatible with standard lead (Pb) free
printed circuit board assembly processes. Internally, the flip-chip uses high­temperature Pb-based solder balls, currently exempt from RoHS. The device is
fully calibrated prior to shipment from the factory.

Features and Benefits

• Small footprint, low-profile SOIC8 package

• 1.5 mΩ internal conductor resistance

• Excellent replacement for sense resistors

• 1600 V

• 4.5 to 5.5 V, single supply operation

• 50 kHz bandwidth

• 133 mV/A output sensitivity and 15 A dynamic range

• Output voltage proportional to ac and dc currents

• Factory-trimmed for accuracy

• Extremely stable output offset voltage

• Near-zero magnetic hysteresis

• Ratiometric output from supply voltage

minimum isolation voltage between pins 1-4 and 5-8

RMS

/ 2) when an increasing current

CC

TÜV America
Certificate Number:
U8V 04 12 54214 005

ACS706ELC05C-DS, Rev. 1

Use the following complete part number when ordering:

Part Number Package

ACS706ELC-05C SOIC8 surface mount

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

Pin 3 Pin 4

IP– IP–

ACS706ELC-05C

Functional Block Diagram

VCC
Pin 8

Voltage

Regulator

To all subcircuits

Cancellation

Dynamic Offset

Amp Out

Filter

VOUT

Pin 7

N.C.

Pin 6

+5 V

A

0.1 μF

IP+ IP+

Pin 1 Pin 2

Gain

A

Pins 6 and 7 are internally connected in shipping product.
For compatibility with future devices, leave pin 6 floating.

Temperature
Coefficient

Trim Control

GND
Pin 5

Offset

ACS706ELC05C-DS, Rev. 1

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2

ACS706ELC-05C

OPERATING CHARACTERISTICS

Characteristic Symbol Test Conditions Min. Typ. Max. Units

ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise specified
Optimized Accuracy Range I
Linear Sensing Range I
Supply Voltage V
Supply Current I
Output Resistance R
Output Capacitance Load C
Output Resistive Load R
Primary Conductor Resistance R
RMS Isolation Voltage V
DC Isolation Voltage V

P

R

CC

VCC = 5.0 V, output open 5 8 10 mA

CC

OUTIOUT

LOAD

LOAD

PRIMARYTA

ISORMS

ISODC

VOUT to GND – – 10 nF
VOUT to GND 4.7 – – kΩ

Pins 1-4 and 5-8; 60 Hz, 1 minute 1600 2500 – V

= 1.2 mA – 1 2 Ω

= 25°C – 1.5 – mΩ

PERFORMANCE CHARACTERISTICS, over operating ambient temperature range, unless otherwise specified
Propagation Time t
Response Time t
Rise Time t

PROPIP

RESPONSEIP

r

Frequency Bandwidth f –3 dB, T

Sensitivity Sens

Noise V

Linearity E
Symmetry E
Zero Current Output Voltage V

Electrical Offset Voltage V

Magnetic Offset Error

Total Output Error

1

THERMAL CHARACTERISTICS

Junction-to-Lead Thermal
Resistance

Junction-to-Ambient Thermal
Resistance

1

Percentage of IP, with IP = 5 A. Output filtered. Up to a 2.0% shift in E

2

The Allegro evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connect-

NOISE

LIN

SYM

OUT(Q)IP

OE

I

ERROMIP

E

TOT

2,3

, TA = –40°C to 125°C, VCC = 5 V unless otherwise specified

R

θJL

R

θJA

=±5 A, TA = 25°C – 3.15 – μs
=±5 A, TA = 25°C – 6 – μs

IP =±5 A, TA = 25°C – 7.45 – μs

= 25°C; IP is 10 A peak-to-peak; no external filter – 50 – kHz

A

Over full range of I
Over full range of I

, IP applied for 5 ms; TA = 25°C – 133 – mV/A

P

, IP applied for 5 ms 124 – 142 mV/A

P

Peak-to-peak, TA = 25°C, no external filter – 90 – mV
Root Mean Square, T

= 25°C, no external filter – 16 – mV

A

Over full range of IP , IP applied for 5 ms – ±1 ±4.7 %
Over full range of IP , IP applied for 5 ms 98 100 104.5 %

= 0 A, TA = 25°C – VCC / 2 – V
IP = 0 A, TA = 25°C –15 – 15 mV
IP = 0 A –65 – 65 mV

= 0 A, after excursion of 5 A – ±0.01 ±0.05 A
IP =±5 A , IP applied for 5 ms;TA = 25°C – ±1.5 – %
IP = ±5 A , IP applied for 5 ms – – ±12.5 %

Mounted on the Allegro ASEK 70x evaluation board; additional
information about reference boards and tests is available on the
Allegro Web site

Mounted on the Allegro ASEK 70x evaluation board; additional
information about reference boards and tests is available on the
Allegro Web site

may be observed at end-of-life for this device.

TOT

ing the layers. Performance values include the power consumed by the PWB. Further details on the board are available from the ACS704 Frequently
Asked Questions document on our website. Further information about board design and thermal performance also can be found on pages 16 and 17 of
this datasheet.

3

R

values shown in this table are typical values, measured on the Allegro evaluation board. The actual thermal performance depends on the board

θJA

design, the airflow in the system, and thermal interactions between the sensor and surrounding components through the PCB and the ambient air. To
improve thermal performance, see our applications material on the Allegro Web site.

–5 – 5 A

–15 – 15 A

4.5 5.0 5.5 V

– 5000 – V

– Value – Units

– 5 – °C/W

– 41 – °C/W

ACS706ELC05C-DS, Rev. 1

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3

(mA)

CC

I

10.0

9.5

9.0

8.5

8.0

7.5

7.0

6.5

ACS706ELC-05C

Typical Performance Characteristics

Supply Current versus Ambient Temperature

V

= 5 V

CC

6.0

-50 -25 0 25 50 75 100 125 150

TA (°C)

Supply Current versus Applied V

8.50

8.45

8.40

8.35

8.30

8.25

(mA)

CC

8.20

I

8.15

8.10

8.05

8.00

4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5

V

(V)

CC

CC

ACS706ELC05C-DS, Rev. 1

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4

4.0

3.5

ACS706ELC-05C

Output Voltage versus Primary Current

V

= 5 V

CC

3.0

(V)

2.5

OUT

V

2.0

1.5

1

1.0

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9

IP (A)

°C

– 40
–

Sensitivity versus Primary Current

V

= 5 V

160

150

145

140

135

CC

20
25
85

125

°C

– 40
–

20
25
85

125

130

125

Sens (mV/A)

120

115

110

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9

ACS706ELC05C-DS, Rev. 1

IP (A)

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5

2.530

2.520

2.510

(V)

2.500

OUT(Q)

V

2.490

2.580

ACS706ELC-05C

Zero Current Output Voltage vs. Ambient Temperature

IP = 0 A

2.470

-50 -25 0 25 50 75 100 125 150

TA (°C)

Zero Current Output Currrent versus Ambient Temperature

(Data in above chart converted to amperes)

IP = 0 A

0.3

0.2

0.1

(A)

0

VOUT(Q)

I

–0.1

–0.2

ACS706ELC05C-DS, Rev. 1

–0.3

–50 –25 0 25 50 75 100 125 150

TA (°C)

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6

ACS706ELC-05C

Magnetic Offset Error versus Ambient Temperature

VCC = 5 V; IP = 0 A, after excursion to 5 A

1.0

0.8

0.6

0.4

0.2

(mA)

0

OM

V

-0.2

-0.4

-0.6

-0.8

-1.0

-50 -25 0 25 50 75 150100 125

T

(°C)

A

Nonlinearity versus Ambient Temperature

V

= 5 V

3.0

2.5

2.0

(%)

1.5

LIN

E

1.0

0.5

0

-50-250 255075 150100 125

CC

IP = 5 A

TA (°C)

ACS706ELC05C-DS, Rev. 1

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7

ACS706ELC-05C

Typical Percentage Error versus Ambient Temperature

Measurements taken at TA = –40, 25, –20, 85 and 125°C

15

Mean + 3 Sigma

10

5

0

(% of 5 A)

TOT

-5

E

-10

-15

-50 -25 0 25 50 75 100 125 150

Mean
Mean – 3 Sigma

TA (°C)

ACS706ELC05C-DS, Rev. 1

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8

ACS706ELC-05C

Step Response of ACS706ELC-05C at T

ACS706 Output (mV)

5 A Excitation Signal

Time = 10 μs/div.
Excitation signal = 1.00 A/div.
Output = 100 mV/div.

=25°C

A

ACS706ELC05C-DS, Rev. 1

Typical Peak-to-Peak Noise of ACS706ELC-05C at TA=25°C

Time = 20 μs/div.
Noise = 20.0 mV/div.

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9

ACS706ELC-05C

ACS706ELC-05C Noise Filtering and Frequency Response Performance

Nominal

Break Frequency

of Filter on Output

(kHz)

Unfiltered – –

80 0.200

50 0.320 64.7 0.486 10.08

40 0.392 60.3 0.453 11.39

20 0.800 43.3 0.326 17.56

10 1.6 28.9 0.218 31.96

7.0 3.15 18.3 0.137 54.55

3.3 4.8 13.8 0.104 81.77

0.6 26 1.9 0.015 404.16

0.3 53 0.76 0.00573 732.89

Resistance

(kΩ)

Capacitance

(μF)

0.01

Programmed

Sensitivity

(mV/A)

133

Filtered

Peak-to-

Peak Noise

(mV)

90 0.677 7.45

75.9 0.571 8.26

Resolution

with Filtering

(A)

Rise Time

for 5A Step,

Filtered

(μs)

ACS706ELC05C-DS, Rev. 1

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10

ACS706ELC-05C

Definitions of Accuracy Characteristics

Definitions of Accuracy Characteristics

Sensitivity (Sens). The change in sensor output in response to a 1 A change through the primary conductor. The sensitivity is the prod­uct of the magnetic circuit sensitivity (G / A) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the
factory to optimize the sensitivity (mV/A) for the full-scale current of the device.

Noise (V

). The product of the linear IC amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (≈1 G).

NOISE

The noise floor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity
(mV/A) provides the smallest current that the device is able to resolve.

Linearity (E

): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through its

LIN

full-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale
current. The following equation is used to derive the linearity:

where V

out_full-scale amperes

Symmetry (E

V

(

100

out_full-scale amperes

1–

[{

2 (V

out_half-scale amperes

= the output voltage (V) when the sensed current approximates full-scale ±IP .

). The degree to which the absolute voltage output from the sensor varies in proportion to either a positive or nega-

SYM

– V

– V

OUT(Q)

OUT(Q)

)

[{

)

tive full-scale primary current. The following formula is used to derive symmetry:

V

out_+full-scale amperes

100

Quiescent output voltage (V

V

). The output of the sensor when the primary current is zero. For a unipolar supply voltage, it

OUT(Q)

OUT(Q)

–V

nominally remains at VCC ⁄ 2. Thus, VCC = 5 V translates into V

out_–full-scale amperes

OUT(Q)

– V

OUT(Q)

= 2.5 V. Variation in V

can be attributed to the resolution

OUT(Q)

of the Allegro linear IC quiescent voltage trim and thermal drift.

Electrical offset voltage (VOE). The deviation of the device output from its ideal quiescent value of VCC / 2 due to nonmagnetic causes.
To convert this voltage to amperes, divide by the device sensitivity, Sens.

Accuracy (E

). The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the

TOT

total ouput error. The accuracy is illustrated graphically in the Output Voltage versus Current chart on the following page.

Accuracy is divided into four areas:

• 0 A at 25°C. Accuracy of sensing zero current flow at 25°C, without the effects of temperature.

• 0 A over Δ temperature. Accuracy of sensing zero current flow including temperature effects.

• Full-scale current at 25°C. Accuracy of sensing the full-scale current at 25°C, without the effects of temperature.

• Full-scale current over Δ temperature. Accuracy of sensing full-scale current flow including temperature effects.

Ratiometry. The ratiometric feature means that its 0 A output, V

tional to its supply voltage, V

. The following formula is used to derive the ratiometric change in 0 A output voltage, ΔV

CC

V

OUT(Q)VCC

100

‰

The ratiometric change in sensitivity, ΔSens

(%), is defined as:

RAT

100

Sens

‰

ACS706ELC05C-DS, Rev. 1

, (nominally equal to VCC/2) and sensitivity, Sens, are propor-

OUT(Q)

/ V

OUT(Q)5V

VCC /

VCC

VCC /

5 V

/ Sens

5 V

5V





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OUT(Q)RAT

(%):

11

ACS706ELC-05C

Output voltage vs. current, illustrating sensor accuracy at 0 A and at full-scale current

–IP(A)

Increasing V

OUT

(V)

Accuracy

vrOeΔTemperature

Accuracy
25°C Only

Average

V

OUT

Accuracy

vrOeΔTemperature

Accuracy

25°C Only

–I

P

I

P

+IP(A)

Full Scale

ACS706ELC05C-DS, Rev. 1

Accuracy
25°C Only

Accuracy

vrOeΔTemperature

0A

Decreasing V

OUT

(V)

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12

ACS706ELC-05C

Definitions of Dynamic Response Characteristics

Propagation delay (t

): The time required for the sensor output to reflect a change in the primary cur-

PROP

rent signal. Propagation delay is attributed to inductive loading within the linear IC package, as well as in the
inductive loop formed by the primary conductor geometry. Propagation delay can be considered as a fixed time
offset and may be compensated.

Primary Current

Transducer Output

Propagation Time, t

PROP

t

Response time (t

RESPONSE

I (%)

90

0

): The time interval between a) when the primary current signal reaches 90% of its

final value, and b) when the sensor reaches 90% of its output corresponding to the applied current.

I (%)

90

Primary Current

Transducer Output

Rise time (t

0

Response Time, t

): The time interval between a) when the sensor reaches 10% of its full scale value, and b) when

r

RESPONSE

t

it reaches 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the
current sensor, in which ƒ(–3 dB) = 0.35 / tr. Both tr and t

RESPONSE

are detrimentally affected by eddy current

losses observed in the conductive IC ground plane.

Primary Current

Transducer Output

Rise Time, t

r

t

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ACS706ELC05C-DS, Rev. 1

I (%)

90

10

0

13

ACS706ELC-05C

Standards and Physical Specifications

Parameter Specification

Flammability (package molding compound) UL recognized to UL 94V-0

UL60950-1:2003

Fire and Electric Shock

Device Branding Key (Two alternative styles are used)

ACS Allegro Current Sensor

706 Device family number

T Indicator of 100% matte tin leadframe plating

ACS706T

ELC05C

YYWWA

ACS706T

ELC05C

L...L

YYWW

E Operating ambient temperature range code

LC Package type designator

05C Primary sensed current

YY Manufacturing date code: Calendar year (last two digits)

WW Manufacturing date code: Calendar week

A Manufacturing date code: Shift code

ACS Allegro Current Sensor

706 Device family number

T Indicator of 100% matte tin leadframe plating
E Operating ambient temperature range code

LC Package type designator

05C Primary sensed current

L...L Manufacturing lot code

YY Manufacturing date code: Calendar year (last two digits)

WW Manufacturing date code: Calendar week

EN60950-1:2001
CAN/CSA C22.2 No. 60950-1:2003

ACS706ELC05C-DS, Rev. 1

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14

ACS706ELC-05C

Chopper Stabilization Technique

Chopper Stabilization is an innovative circuit technique that is used to minimize the offset voltage of a Hall
element and an associated on-chip amplifier. Allegro patented a Chopper Stabilization technique that nearly
eliminates Hall IC output drift induced by temperature or package stress effects. This offset reduction technique
is based on a signal modulation-demodulation process. Modulation is used to separate the undesired dc offset
signal from the magnetically induced signal in the frequency domain. Then, using a low-pass filter, the modu­lated dc offset is suppressed while the magnetically induced signal passes through the filter. As a result of this
chopper stabilization approach, the output voltage from the Hall IC is desensitized to the effects of temperature
and mechanical stress. This technique produces devices that have an extremely stable Electrical Offset 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 that allows the use of low-offset and
low-noise amplifiers in combination with high-density logic integration and sample and hold circuits.

Regulator

Clock/Logic

Hall Element

Amp

Concept of Chopper Stabilization Technique

Low-Pass
Filter

Hold

Sample and

ACS706ELC05C-DS, Rev. 1

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15

ACS706ELC-05C

Applications Information

Transient Common-Mode Voltage Rejection in the ACS706

In order to quantify transient common-mode voltage rejection for the ACS706, a device was soldered onto a printed
circuit board. A 0.1 μF bypass capacitor and a 5 V dc power supply were connected between VCC and GND (pins 8 and

5) for this device. A 10 kΩ load resistor and a 0.01 μF capacitor were connected in parallel between the VOUT pin and
the GND pin of the device (pins 7 and 5).

8

7

Output

6

C3

C=0.01µF

C=0.1µF

R=10kΩ

R0

5

C0

Vcc

VDC=5V

Ground

V0

GND

V

OUT

=0V

V

OUT

=20VPP

freq=variable

1

2

I

P

3

V1

4

ACS706 Schematic Diagram of the Circuit used to Measure Transient Rejection

A function generator was connected between the primary current conductor (pins 1 thru 4) and the GND pin of
the device (pin 5). This function generator was configured to generate a 10 V peak (20 V peak-to-peak) sine
wave between pins 1-4 and pin 5. Note that the sinusoidal stimulus was applied such that no electrical current
would flow through the copper conductor composed of pins 1-4 of this device.

The frequency of this sine wave was varied from 60 Hz to 5 MHz in discrete steps. At each frequency, the
statistics feature of an oscilloscope was used to measure the voltage variations (noise) on the ACS706 output
in mV (peak to peak). The noise was measured both before and after the application of the stimulus. Transient
common-mode voltage rejection as a function of frequency is shown in the following figure.

–30

–35

–40

–45

–50

–55

Transient Rejection (dB)

–60

ACS706ELC05C-DS, Rev. 1

0.06 1 10 100 300 600 800 1000 3000 5000

Frequency of 20 V Peak-to-Peak Stimulus

(kHz)

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16

ACS706ELC-05C

The Effect of PCB Layout on ACS706 Thermal Performance

Eight different PC boards were fabricated to characterize the effect of PCB design on the operating junction temperature of the
Hall-effect IC inside of the ACS706. These PC boards are shown in the figure below.

2 oz. Cu on one side of board 2 oz. Cu on both sides of board

An ACS706 device was soldered on to each PCB for thermal testing. The results of the testing are shown in the following table.

Test Results on Eight Thermal Characterization PCBs

Tested at 15A, TA = 20°C, still air, 2 oz. copper traces, current carried on and off board

by 14 gauge wires

PC Boards

Sides with Traces

1

2

Trace Width (mm) Trace Length (mm)

45090

1.5 50 Overheated
41048

1.5 10 110
45053

1.5 50 106
41038

1.5 10 54

Temperature Rise

Above Ambient (°C)

ACS706ELC05C-DS, Rev. 1

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17

ACS706ELC-05C

Improved PC Board Designs

The eight PC boards in the figure above do not represent an ideal PC board for use with the ACS706. The ACS706 evaluation
boards, for sale at the Allegro Web site On-Line Store, represent a more optimal PC board design (see photo below). On the
evaluation boards, the current to be sensed flows through very wide traces that were fabricated using 2 layers of 2 oz. copper.
Thermal management tests were conducted on the Allegro evaluation boards and all tests were performed using the same test
conditions described in the bulleted list above. The results for these thermal tests are shown in the table below. When using
the Allegro evaluation boards we see that even at an applied current of 20 A the junction temperature of the ACS706 is only
≈30 degrees above ambient temperature.

Test Results on Eight Electrical Characterization PCBs

Tested at TA = 20°C, still air

Applied Current

(A)

15 22

20 31

Temp Rise Above Ambient

(°C)

ACS706ELC05C-DS, Rev. 1

Allegro Current sensor evaluatin board with ACS706
and external connections.

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18

ACS706ELC-05C

Package LC, 8-pin SOIC

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

6.20

.244

5.80

.228

M

M B

0.25 [.010]

5.00

.197

4.80

8

A

.189

21

A

4.00

3.80

B

.157
.150

8º
0º

0.25

0.17

1.27

0.40

0.25 .010

.050
.016

.010
.007

8X

8X

0.51

0.31

0.25 [.010]

C0.10 [.004]

.020
.012

M C A B

1.27 .050

0.25

0.10

SEATING
PLANE

1.75

1.35

.010
.004

.069
.053

C

SEATING PLANE

GAUGE PLANE

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, Allegro MicroSystems, Inc.

ACS706ELC05C-DS, Rev. 1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

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