8W Current Sense
Chip Resistors
OBSOLETE
BCS 8 Series
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·
·
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Non inductive design.
Low TCR, typically less than 100ppm/°C.
Low profile surface mount package.
Excellent pulse/surge performance.
8W power rating.
Applications
Current sense applications
Over current protection in Battery chargers.
Servo motor control circuits.
DC-DC, DC-AC and intelligent power modules.
Industrial PC modules (IPM) and precision measurement systems.
Current detection circuits in high-speed CPU peripherals.
Dimensions
Type
A
B
C
D
BCS8 (mm)
12.8+/-0.5
7.8max
2.5max
1.4max
D
A
D
C
B
Marking
Marking is done by 3 digits resistance value notation
and tolerance code F (1%).
R001F
Electrical
BCS8
Resistance values
TCR
Tolerance
Power Rating
Current Rating
Maximum Current
Series Inductance
Operating Temp.
Storage Temp.
0.5m, 1m, 2m, 3m, 4m, 5m, 7m, 10mΩ
0 to +100 ppm/°C (A)
+/-1.0% (F), +/-5.0% (J)
8W
90A
126A
5nH
-55 C to 175 °C
-55 C to 175 °C
Attached to70 micron PCB
At 1m
Ω
2.5 seconds one time
-55 to +125 °C
Remarks
Environmental
Specifications
Short Time Overload
Low Temperature Storage
High Temperature Storage
Heat Shock
Vibration
Soldering Heat
Solderability
Humidity
Load Life
R+/-(0.5%+0.5mΩ)
R +/-(0.5%+0.5mΩ)
R +/-(1.0%+0.5mΩ)
R +/-(0.5%+0.5mΩ)
R +/-(0.5%+0.5mΩ)
R +/-(0.25%+0.5mΩ)
90%/terminal surface
R +/-(0.5%+0.1mΩ)
R +/-(0.5%+0.1mΩ)
85°C, 85%RH, dc 0.1W, 1000 hours
25°C, dc rated power, 90min ON, 30min OFF, 1000hours
-55C, 24hours
+175C, 1000hours
-55C to +125C, 20min. interval, 5min. 5cycles
10-2000Hz, 1.5mm/20gr, 2hours
260°C+/-5°C, 10+/-1 seconds.
Conditions
maximum current, 2.5seconds.
Specifications subject to change without notice.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
02.12
8W Current Sense
Chip Resistors
BCS 8 Series
OBSOLETE
Temperature Rise
Temperature (°C) at hot spot.
BCS8-R001F
250
Frequency Characteristics
Impedance(Ω)
0.050
200
150
0.010
100
0.005
50
0
0.001
10k
100k
1M
Frequency(Hz)
10M
0
2 .0
4.0
6 .0
8.0
Applied Power (W)
1 0.0
TCR Curves
(Dotted line: typical measurement)
Recommended Foot Print (mm)
+4000
Slope of +30ppm/°C
+2000
0
-2000
Slope of –30ppm/°C
7.4
(10.2 for 0.5mohm)
2.5
-4000
//
-50
2.5
0
25
50
75
Resistor Temperature (°C)
100
125
9.0
FR4 Thermal PCB Characterisation
Pad Dimensions (x,y mm)
60, 45
50, 45
40, 40
30, 30
20, 20
10, 10
P
90 °C, 70um
(W)
5.8
5.4
4.2
3.5
2.9
2.4
P
90 °C, 35um
(W)
4.6
4.3
4.1
2.8
2.7
2.5
Y mm
BCS 8
X mm
Notes: Characterisation carried out using 70µm and 35µm PCB copper pad weights, with the temperature of 90°C used as a maximum reference
on the PCB.
Soldering Recommendation
Due to the enhanced heat dissipation properties of the BCS8, the temperature profile during reflow soldering will need to be increased
by: 10 to 20°C.
Custom designs
Alternative widths and lengths are available, please contact factory for details.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
02.12
8W Current Sense
Chip Resistors
BCS 8 Series
OBSOLETE
Dimensions and Taping specification
D
1.75
A
E
C
B
D
11.50
.
24.0+/-0.3
G
0.30+/-0.05
2.00
4.00
F
Dia. 1.50+0.1-0
Dia.1.50+0.1-0
Reel
Diameter
(mm)
254
254
254
254
254
254
254
254
Quantity
per Reel
(pieces)
1000
2000
2000
2000
1000
2000
1000
2000
P/N
WSL8A0.5milliohmJ(5%)/F(1%)
WSL8A 1milliohmJ(5%)/F(1%)
WSL8A 2milliohmJ(5%)/F(1%)
WSL8A 3milliohmJ(5%)/F(1%)
WSL8A 4milliohmJ(5%)/F(1%)
WSL8A 5milliohmJ(5%)/F(1%)
WSL8A 7milliohmJ(5%)/F(1%)
WSL8A 10milliohmJ(5%)/F(1%)
A
(mm)
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
12.8+/-0.5
B
(mm)
7.8+/-0.5
4.5+/-0.5
4.5+/-0.5
4.5+/-0.5
5.5+/-0.5
4.5+/-0.5
5.2+/-0.5
4.2+/-0.5
C
(mm)
2.5 max
1.5 max
1.5 max
1.5 max
1.5 max
1.5 max
0.6 max
0.6 max
D
(mm)
1.3
1.4
1.4
1.4
1.4
1.4
1.3
1.3
E
(mm)
13.9
13.5
13.5
13.5
13.9
13.5
13.9
13.5
F
(mm)
8.7
5.0
5.0
5.0
8.7
5.0
8.7
5.0
G
(mm)
3.75
1.70
1.70
1.70
3.75
1.70
3.75
1.70
Note : Above dimensions are approximate.
Resistor
Contact Probe
Current
Voltage
Resistance testing the BCS resistors is done at the side
positions of resistor terminals (see figure) using a 4 - port
measuring system.
For a stated resistance tolerance of +/-1.0%, the measured
values should be within the +/-0.8% factory tested values.
When surface mount resistor is attached on circuit board,
small resistance changes will occur. Custom designs are
available, please call the factory.
Ohm Meter
Ordering Information
BCS 8 R001 F
Model
Power Rating
8 : 8W
Resistance Code Tolerance
R001: 0.001Ω
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Tolerance
J = 5% Tol
F = 1% Tol
© TT electronics plc
02.12
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