BWS03, BWS05 CHIP SHUNT RESISTORS

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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 0.5mΩ. The BWS05 can handle
a constant power of 7W at 0.2mΩ and a continuous load of 180A at 0.2mΩ. Applications include:
Current sensors for hybrid power sources, frequency converters and high current automotive applications.

GENERAL SPECIFICATIONS

Model	Power [W]	Resistance [mΩ]	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	0.5mΩ	Manganin	0.88mm+/-0.05
BWS03-M	1mΩ	Manganin	0.43mm+/-0.05
BWS03-N	2mΩ	NiCr Alloy	0.64mm+/-0.05
BWS03-N	3mΩ	NiCr Alloy	0.43mm+/-0.05
BWS03-N	4mΩ	NiCr Alloy	0.32mm+/-0.05
BWS05-M	0.2mΩ	Manganin	1.5mm±0.05
BWS05-M	0.5mΩ	Manganin	0/56mm+/-0.05
BWS05-N	1mΩ	NiCr Alloy	0.90mm+/-0.05
BWS05-N	2mΩ	NiCr Alloy	0.45mm+/-0.05
BWS05-N	3mΩ	NiCr Alloy	0.30mm+/-0.05

RATED POWER DEPENDENCE OF RESISTANCE VALUE

Model	Resistance Value[mΩ]	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[mΩ]	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

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