Low Ohm Resistors——KOA


High precision | Low inductance | Large current type Current Sense Shunt series -Various kinds of lineup

The first step of power management of electronic devices is to measure the current. To measure correctly and efficiently, you need to select suitable current sense resistors for your application. Once you read this page, you can soon find your answer among KOA products offering from thick film chip construction to metal plate construction shunt.


KOA's Currnet Sense Shunt / Low Ohm Resistors


Power Rating and Resistance Distribution of Current Sense Shunt / Low Ohm Resistors

※Click each product series to find the details


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Features of Current Sense Shunt / Low Ohm Resistors

Motor control up to 244A and large current sensing of DC-DC converters and battery management.


PSJ2/PSL2/PSG4/PSF4



*Under Development.

Power rating 12W max. achieved. Both 2- and 4- terminal constructions in our new product lineup. PSG4 and PSF4, 4-terminal construction type, enables high precision performance by T.C.R.+/- 50x10-6/K.


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Motor control up to 600A and extremely large current sensing of DC-DC converters and battery management.

HS


*Under Development

High current sensing possible even at low resistance 0.1mΩ, by voltage detecting terminals. Custom configuration available by various way of attachment.



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Excellent high frequency characteristics


TLR 


The manufacturing process of resistors includes "trimming" process where the partial resistive body is cut to adjust the resistance. This trimming process would not cause any problem in the normal circuit, while it does cause various problem in the high speed circuit under large current.
TLR series adjusts the resistance without trimming.


[TLR - Heat dissipation distribution]

1.The distribution of heat dissipation is uniformed without cutting in the resistor, leading to effective heat dissipation.



[Detected Waveform]

2.Measuring errorsis corrected, caused by the inductance of the resistor itself.

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High precision sensing of large current

PS  



Same construction of TLR, good high frequency characteristics. The stress of heat cycle is improved by the original shape pf PSB. PSE series achieves high power up to 5W in small size. KOA's lowest resistance 0.2mΩ and max. 250A current sensing available.

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High reliable resistors under high temperature


Resistive body molded by flame retardant resin, strong to temperature change and endurance. The terminals apply metal plate, which offers terminal strength and solderability. Wide operating temperature range from -55°C to +180°C, suitable for electronic devices under automotive environment.

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Various size and power ratings. Selectable like general-purpose flat chip

SR73


SR73 1H is small type chip resistors, size 0.6mm x 0.3mm. Mountable on high density mounting devices like mobile phones, PDC and HDD.
Applicable to various scenes like remain level detection of secondary battery and overcurrent protection circuit.

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Low resistance under 100mΩ and realizes high precision

UR73 

Resistance: 10mΩ~100mΩ & TCR:±100 x 10-6/K. Tolerance: ±1% is standard for this high precision resistors.
Works excellent in the circuits like battery charge circuit, requiring low resistance(10mΩ~) and high power( up to 1W).


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Wide terminal type and high power

WK73  

Resistance: 10mΩ~100mΩ & TCR:±100 x 10-6/K. Tolerance: ±1% is standard for this high precision resistors.
Works excellent in the circuits like battery charge circuit, requiring low resistance(10mΩ~) and high power( up to 1W).

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Wide terminal, low TCR & high power

WU73  

Resistance 13mΩ or more and TCR±75 x 10-6/K is achieved. Wide terminals achieves high power in small size. Excellent heat cycle, and suitable for devices requiring reliability such as automotive purposes




post time:2018-06-27