Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
Rev1.4 e EC
2 June. 2015
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ALPS GREEN DEVICES CO., LTD.
Current sensor for PW Board mounting
GCBC040-1A
Data sheet
Rev.1.4 e EC 2015.06.02
ALPS GREEN DEVICES CO., LTD.
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
Rev1.4 e EC
2 June. 2015
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ALPS GREEN DEVICES CO., LTD.
Table of contents
1. Introduction ................................................................................................................................... 3
2. Features and Advantages ............................................................................................................ 3
3. Principle ......................................................................................................................................... 3
4. Applications ................................................................................................................................... 3
5. Block Diagram and Typical Application...................................................................................... 4
5.1. Block Diagram .......................................................................................................................... 4
5.2. Typical Application ................................................................................................................... 4
6. Dimensions and Terminal Designation ....................................................................................... 7
7. Operating Characteristics ............................................................................................................ 8
7.1. Absolute Maximum Ratings ..................................................................................................... 8
7.2. Operating Condition ................................................................................................................. 8
7.3. Recommended Operating Condition ........................................................................................ 8
7.4. Electrical Characteristics (No Load, Vdd=5.0V, Ta=25°C) ...................................................... 8
7.5. Electrical Characteristics (RL=10kΩ, Vdd=5.0V, Ta=25°C)..................................................... 9
7.6. Start-up timing ........................................................................................................................ 10
7.6.1. Start-up ........................................................................................................................... 10
7.6.2. Low voltage detection ..................................................................................................... 10
7.7. Influence from the ambient magnetic field ............................................................................. 11
8. Characteristic Definitions ........................................................................................................... 12
9. Characteristic Data...................................................................................................................... 14
10. Recommended Soldering Conditions ................................................................................... 15
10.1. Manual Soldering ............................................................................................................... 15
11. Referential Land Pattern ......................................................................................................... 15
12. Extras ........................................................................................................................................ 16
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
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ALPS GREEN DEVICES CO., LTD.
1. Introduction
Current sensor GCBC series is for use on the electronic measurement of DC, AC, or pulsed currents
with no contact.
2. Features and Advantages
Coreless, small and lightweight(3g) design with high sensitivity magneto-resistive(MR) elements.
Low primary-conductor resistance: 60μΩ.
Good linearity: ±0.5%F.S.
+5V single power supply.
Operating temperature: -40°C~+105°C.
DC and AC current measurement with quick response.
3. Principle
Current sensor detects the magnetic induction generated by the primary current to be measured.
In the module, MR element with conditioning IC is located on the bus bar (path of the primary
current).
The magnetic field control board is arranged around bus bar and MR element so that module output
with high sensitivity can be made. On the other hand, the output error by outer magnetic field, which
has no relationship to the magnetic induction of primary current, is decreased.
Fig.3-1 Principle of measurement
Fig.3-2 The magnetic induction generated by the primary current (simulation)
4. Applications
Motor drivers and general-purpose inverters, PV Inverter systems, Server power supplies, Packaged
air-conditioning units, NC machine tools and other industrial and etc...
Product Name
Current Sensor
Part No.
GCBC040-1A
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5. Block Diagram and Typical Application
5.1. Block Diagram
Fig.5-1 Block Diagram of the module
5.2. Typical Application
Refer to chapter 7.3 for the recommended operating condition of the load.
(1) Basic connection
Fig.5-2 Basic connection
* Current sensor has a LPF with coefficients described in above figure.
* Refer electrical characteristics to chapter 7.4, if RL can be regarded as no-load.
Product Name
Current Sensor
Part No.
GCBC040-1A
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(2) 3.3V input for A/D
Fig.5-3 3.3V input for A/D
* Use step down resistance to divide output voltage of the current sensor, if input voltage of A/D is
3.3V.
(3) External filter circuit
Fig.5-4 External filter circuit
* Mount a LPF, if necessary.
* Note that Two-stage LPF configuration due to connect an externally LPF, since a current sensor
has a built-in LPF.
(4) External filter circuit (in multiple)
Fig.5-5 External filter circuit(in multiple)
* Mount an op-amp buffer, if necessary.
Product Name
Current Sensor
Part No.
GCBC040-1A
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(5) Output treatment for the unknown state
Start up time is necessary for this product. During that time, output signal becomes Hi-Z. If you want
to fix the output voltage during that timing, please see below as your reference.
Pull-up
Fig.5-6 Pull-up
* Fix the potential to 5V in the period of the Hi-Z, if it is necessary to keep +5V during start-up or low
voltage detection as an output signal.
* Refer to chapter 7.6 regarding start-up timing.
* Note that output load RL of the current sensor is not less than 10kΩ. Voltage Vout of the output is
the resistance divider ratio of the 100Ω of built-in filter, if connect a pull-up resistor. Therefore, the
use of precision resistors, such as 1% so that the error variation of the resistance partial pressure is
not increased.
Pull-down
Fig.5-7 Pull-down
* Fix the potential to 0V in the period of the Hi-Z, if it is necessary to keep 0V during start-up or low
voltage detection as an output signal.
* Refer to chapter 7.6 regarding start-up timing.
* Note that output load RL of the current sensor is not less than 10kΩ. Voltage Vout of the output is
the resistance divider ratio of the 100Ω of built-in filter, if connect a pull-up resistor. Therefore, the
use of precision resistors, such as 1% so that the error variation of the resistance partial pressure is
not increased.
* Refer electrical characteristics to chapter 7.5, if RL can be regarded as 10kΩ.
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
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6. Dimensions and Terminal Designation
Attention: Sensor size may be changed.
Fig.6-1 Dimensions
No.
Name
Description
1
Vout
Signal Output
2
GND
Ground
3
VDD
+5V Power Supply
4
N
Primary Current terminal (-)
5
P
Primary Current terminal (+)
Fig.6-2 Pin assignment
5
4
3
2
1
unit [mm]
Current flow direction
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
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7. Operating Characteristics
7.1. Absolute Maximum Ratings
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Supply Voltage
Vdd
-0.3
5.5
V
Vdd pin
2
Output Current
(VOUTpin)
Iout
-1.1
1.1
mA
Vout pin, continuously
Iout
-40
40
mA
Vout pin, pulse width 1μs,
Period 1kHz
3
Storage temperature
Ts
-40
105
°C
4
Storage ambient
magnetic field
Bs
-8
8
mT
5
Maximum current
(over current)
Ipoc
-110
110
A
6
Maximum continuous
current
Irmcnt
-40
40
A
7.2. Operating Condition
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Supply Voltage
Vdd
4.85
5.00
5.15
V
±3%(5.0V±0.15V)
2
Primary Current
Measuring Range
Ir
-40
40
A
DC±40A
3
Operating
Temperature
Ta
-40
105
°C
7.3. Recommended Operating Condition
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Output Current
Iout
-0.5
0.5
mA
VOUT pin
2
Load capacity
CL
100
pF
VOUT pin
7.4. Electrical Characteristics (No Load, Vdd=5.0V, Ta=25°C)
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Offset Voltage (*1)
Vof
2.500
V
Vdd×1/2
2
Offset Thermal Drift
TcVof
±0.8
mV/°C
-40~+105°C
3
Sensitivity (*2)
Vo
50.0
mV/A
4
Sensitivity
Temperature Drift
TcVo
±0.02
%/°C
-40~+105°C
5
Linearity
eL
±0.2
%FS
FS=Full Scale
6
Response Time
tr
1
μs
Input Current :
di/dt=40A/μs,
80%Response
7
Current Consumption
Iddmax
13
mA
8
Isolation Voltage
Vins
750
V
AC 50/60Hz,60s
Sensor Unit
9
Insulation Resistance
Rins
500
MΩ
DC500V
Signal Terminal Batch
With Bus bar
10
Hysteresis Error of Vof
(*3)
Voh
±10
mV
Primary Current
Measuring Range
11
Primary Conductor
Resistance (*3)
R1
60
μΩ
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
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7.5. Electrical Characteristics (RL=10kΩ, Vdd=5.0V, Ta=25°C)
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Offset Voltage
(*1, *3)
Vof
2.475
V
Vdd=+5.00V
3
Sensitivity (*2, *3)
Vo
49.5
mV/A
Note: Only characteristics No.1 and 3 are different from No-load.
* 1 Offset voltage will change in ratiometric to supply voltage.
* 2 Sensitivity does not change in the ratiometric to the supply voltage.
* 3 Reference only.
Fig.7-1 Current vs. output voltage
Vdd
1/2Vdd
+40A
-40A
4000mV
(typ.)
Primary current
Output voltage
0
Product Name
Current Sensor
Part No.
GCBC040-1A
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7.6. Start-up timing
7.6.1. Start-up
This current sensor has a conditioning IC.
Conditioning IC will start the start up sequence under operation voltage after power supply is turned
on. The transition to the normal state through the start-up time, Vout output will output a valid voltage.
7.6.2. Low voltage detection
If the supply voltage drops to the operation voltage by instantaneous power failure, output signal will
be stopped and become a Hi-Z by low voltage detention.
To returns from the instantaneous power failure state, conditioning IC will restart the operation with
operation voltage. Transition to the normal state through the start-up time, Vout output will output a
valid voltage. During transition time to the normal operation, Vout signal has some variation (flapping)
as an output signal, since closed loop of magnetic equilibrium expression is controlled by feedback to
be equilibrium.
Start up timing
No
Parameter
Symbol
Min
Typ
Max
Unit
Note
1
Operation start voltage
Vopu
4.05
4.4
4.75
V
2
Operation stop voltage
Vopl
3
3.5
4.5
V
3
Start-up time
Tstup
1
30
ms
Fig.7-2 Start up timing
Product Name
Current Sensor
Part No.
GCBC040-1A
Attention: Modifications on specification, size, etc., may be carried out for improvement without notice.
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7.7. Influence from the ambient magnetic field
This current sensor uses a magnetic sensor for a current detecting. It is influenced by ambient
magnetic field. Reference information to minimize the influence from the ambient magnetic are
described below.
The transformer and the inductor generate the leakage flux , It is affected by the accuracy of the
current sensor by the leakage flux. It especially most affected to the magnetic flux of the X-axis
direction. Please decide component location after your evaluation.
If the current path running parallel in close to the current sensor, The accuracy of the current sensor
is affected by magnetic flux from the another current path. It especially most affected to the magnetic
flux of the Y-axis direction. Please decide PCB pattern design after your evaluation.
Fig.7-3 Direction of the magnetic flux
Z-axis
X-axis
Y-axis
Product Name
Current Sensor
Part No.
GCBC040-1A
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8. Characteristic Definitions
The contents of the main characteristics are shown below. Standard conditions and the standard
state in each item are defined below.
Standard condition: Ambient temperature 25°C
The state of the standard: Supply voltage (DC+5.00V) with No Load.
(1) Offset Voltage
The output voltage when the primary current is 0A.
(2) Offset Thermal Drift
Change of the offset voltage within the range of the operating temperature. The value is the amount
of the change per 1 degree calculated with the output at 25 degrees as the reference.
(3) Sensitivity
The slope of the estimated output. The least squares method from the output voltages for the
primary current within rating is used.
(4) Sensitivity Temperature Drift
Change of the gain within the operating temperature range. The value is the ratio of the change per
1 degree calculated with the gain at 25 degrees as the reference.
(5) Linearity
The error of the output voltage between measured and estimated. The least squares method from
the output voltages at rated primary current, its half current, 0A(offset voltage), is used. The value is
calculated using equation;
Non Linearity = { (Measured Vout - Estimated Vout) /
(Output voltage at positive maximum current of measurement current range -
Output voltage at negative maximum current of measurement current range) } × 100(%FS)
Fig.8-1 Non linearity
Vout
+40A
-40A
Primary current
0
Vout –Estimated Vout
Product Name
Current Sensor
Part No.
GCBC040-1A
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(6) Response Time
Fig.8-2 shows the response time of output (dT) when primary current is square wave which have
40A/us rise/fall time. Response time is defined as the time between 80% change point of input wave
and output.
Fig.8-2 Response Time
(7) Current Consumption
The bus bar rating pass an electric current this current consumption measure.
(8) Isolation Voltage
750V in the AC voltage, 50Hz, and 60sec are impressed to the bus bar with the control terminal
batch under.
(9) Insulation Resistance
It measures between the control terminal batch and the bus bar with Meg ohm meter (DC500V)
under the standard condition.
(10) Hysteresis
Absolute value of the difference of the output when the primary current is 0A between after rated
positive primary current is added and negative one is added.
80%
80%
dT
Product Name
Current Sensor
Part No.
GCBC040-1A
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9. Characteristic Data
Example of typical characteristics.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
-50 -40 -30 -20 -10 0 10 20 30 40 50
Primary current（A）
Output voltage（V）
Fig.9-1 Output voltage
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
-50 -40 -30 -20 -10 0 10 20 30 40 50
Primary current（A）
Linearity（%FS）
Fig.9-2 Linearity
0
2
4
6
8
10
12
14
16
18
20
-50 -40 -30 -20 -10 0 10 20 30 40 50
Primary（A）
Consumption current（mA）
Fig.9-3 Consumption Current
1
2
3
4
5
6
7
8
9
10
11
-5 0 5 10 15 20 25
Time（usec）
Output Voltage （V）
-100
-80
-60
-40
-20
0
20
40
60
80
100
Input Current （A）
Sensor output
Current probe
80%response : 0.5usec
Fig.9-4 Response time
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.70
-50 -25 025 50 75 100 125
Temperature (deg.C)
Offset (V)
Offset drift : +0.15/+0.14mV/deg.C
Fig.9-5 Offset voltage vs. temperature
45
46
47
48
49
50
51
52
53
54
55
-50 -25 025 50 75 100 125
Temperature (deg.C)
Gain (mV/A)
Gain drift : +0.01/+0.01%/deg.C
Fig.9-6 Gain vs. temperature
Product Name
Current Sensor
Part No.
GCBC040-1A
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10. Recommended Soldering Conditions
10.1. Manual Soldering
Temperature
350±5°C
Time
3 sec. max.
Number of Times
2 times max.
Note: The rise in heat of current sensor is influenced by the solder trowel and the mounting substrate.
Please control so that the temperature of the primary current terminal does not exceed 260°C,
when the above-mentioned conditions are impossible.
11. Referential Land Pattern
Referential land pattern is shown here.
Fig.11-1 Referential Land Pattern
Unit: mm
Product Name
Current Sensor
Part No.
GCBC040-1A
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12. Extras
All information described in this document is intended only as guidance to explain operation and how
to use this product, and we do not warrant that this information is not infringe any intellectual property
rights of us and any third party and other rights.
In case of using all information described in this document, you agree that you are solely judgment
and responsible for it. Therefore, you must be in any way responsible or liable for any damages,
expenses or losses incurred by you or third parties arising from the use of this information.
Absolute maximum rating is the value that should not be exceeded. When used beyond the
conditions in one item, breakage or shift of the characteristics without lead to damage, may affect the
reliability and life. In addition, normal operation is not guaranteed.
Electrical characteristics may not be guaranteed, if use more than the operating conditions or the
recommended operating conditions.
The characteristics on this datasheet are the example with NO load and 10kOhm pull-down. Please
note that output voltage varies depending on the load resistance.
The primary current must be below rating. The residual output may cause when the current over
rating is added.
Do not expose the product to strong magnetic field. The residual output may cause.
Do not use the product if it is fallen. The residual output may cause.
Damage may occur by unusual heat when large or constant primary current is added. The amount of
heat depends on the current and heat radiation.
The control wire should be set as short as possible to avoid the outside noise.
Before determine placement and wiring of any parts, please be fully evaluated. Magnetic flux leaking
from the adjacent magnetic parts and magnetic flux generated from the pattern of the PWB which a
large current flows, adversely affect the electrical characteristics.
For the export of products which are controlled items subject to foreign and domestic export laws and
regulations, you must obtain approval and/or follow the formalities of such laws and regulations.
Products must not be used for military and/or antisocial purposes such as terrorism, and shall not be
supplied to any party intending to use the products for such purposes.
Unless provided for otherwise, the products have been designed and manufactured for application in
equipment and devices which are sold to end users in the market, including audio-visual (AV)
equipment, electrical home appliances, office machines, information and communication equipment,
and amusement equipment. The products are not intended for use in, and must not be used for, any
application for nuclear equipment, driving equipment for aerospace or any other unauthorized use.
With the exception of the abovementioned prohibited applications, please contact an Alps sales
representative and/or evaluate the total system regarding applicability for applications involving high
levels of safety and liability such as medical equipment, burglar alarm equipment, disaster
prevention equipment and undersea equipment. Please also incorporate fail-safe design, protection
and redundant circuitry, malfunction protection, and/or fire protection into the complete system to
ensure safety and reliability of the total system.
Before using products which were not specifically designed for use in automotive applications,
please contact an Alps sales representative.
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