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BWS03, BWS05
CHIP SHUNT RESISTORS

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current sensing resistors

INTRODUCTION

These models are manufactured using electron beam welding technology.  This allows the joining of
different alloys with great accuracy and tolerance.  These models have heavy copper connectors,
excellent long term stability and low inductance.  These components can tolerate soldering temperatures
of 350C for 30 seconds or 250C for 10min.  These can be mounted using re-flow soldering or welding
on copper. The BWS03 can handle a power of 5W up to 100A at 0.5m目. The BWS05 can handle
a constant power of 7W at 0.2m目 and a continuous load of 180A at 0.2m戒. Applications include:
Current sensors for hybrid power sources, frequency converters and high current automotive applications.

GENERAL SPECIFICATIONS

Model

Power [W]

Resistance [m目]

Tolerance [%]

TCR [ppm]
[20-150C]

Operating Temperature

BWS03

5

0.5,1,2,3,4

▽1(F)
▽2(G)
▽5(J)

Max. ▽100

-55C to 170C

BWS05

7

0.2,0.5,1,2,3

Max. ▽120

CHARACTERISTICS

Thermal Shock

[▽0.1%]                                            -65C, 25C, 125C, 25C 25 cycles

Short Time Overload

[▽0.2%]                                                Rated Power X 5 for 5 secs.

Resistance to Soldering Heat

[▽0.2%]                                                350C 30 sec or 250C 10 min.

Moisture Resistance

[▽0.2%]                                   90~98%RH,+25C,+65C,-10C 10 cycles

High Temperature Exposure

[▽0.2%]                                                               140C for 250 hours

Vibration High Frequency

[▽0.2%]                                                  15g 10 to 2000Hz 36 cycles

Inductance

[ <3nH ]

Load Life

[▽1.0%]                          90 min ※ON§ 30 min ※OFF§ for 2000 hours

DIMENSIONS AND MATERIALS

Model

Value

Material

Thickness (t)

BWS03-M

0.5m目

Manganin

0.88mm+/-0.05

BWS03-M

1m目

Manganin

0.43mm+/-0.05

BWS03-N

2m目

NiCr Alloy

0.64mm+/-0.05

BWS03-N

3m戒

NiCr Alloy

0.43mm+/-0.05

BWS03-N

4m戒

NiCr Alloy

0.32mm+/-0.05

BWS05-M

0.2m目

Manganin

1.5mm▽0.05

BWS05-M

0.5m目

Manganin

0/56mm+/-0.05

BWS05-N

1m目

NiCr Alloy

0.90mm+/-0.05

BWS05-N

2m目

NiCr Alloy

0.45mm+/-0.05

BWS05-N

3m目

NiCr Alloy

0.30mm+/-0.05

RATED POWER DEPENDENCE OF RESISTANCE VALUE

Model

Resistance
Value[m戒]

Thickness

TCR
(20C & 150C)

Power
[W]

BWS03M

0.5

0.88

▽75ppm/C

5

BWS03M

1

0.43

▽60ppm/C

4

BWS03N

2

0.64

▽100ppm/C

4

BWS03N

3

0.43

▽100ppm/C

3

BWS03N

4

0.32

▽100ppm/C

2.5

Model

Resistance
Value[m戒]

Thickness

TCR
(20C & 150C)

Power
[W]

BWS05M

0.2

1.5

▽100ppm/C

7

BWS05M

0.5

0.56

▽100ppm/C

6

BWS05N

1

0.9

▽120ppm/C

6

BWS05N

2

0.45

▽120ppm/C

4

BWS05N

3

0.3

▽120ppm/C

3.5

DERATING CURVES

PULSE ENERGY/PULSE POWER FOR CONTINUOUS OPERATION

This max. curve is only valid for the resistance value 0.5m. The min. curve is only valid for
the resistance value of 4m. For other resistance values the area in between the max. and
the min. curve is valid.

This max. curve is only valid for the resistance value 0.2m. The min. curve is only valid for
the resistance value 2m.
  For other resistance values the area in between the max. and
the min. curve is valid.

 
THEORETICAL PCB LAYOUT


ORDERING PROCEDURE EXAMPLE

current sensing resistor

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