World's Smallest Current Sensing Resistor!

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All electronics devices are shrinking, but at the same time, requiring more power with multiple functionalities. Components are required to be smaller but must be able to handle more power. For current sensing low resistant resistors, thin film specialist, Sususmu, offers the world’s smallest low resistance chip resistors for unit power. For example, the PRL1632(1206) can handle 1W, while industry typical wattage for this size is 1/4W.

Susumu starts with our proprietary metal alloy for resistive film. Its patented structural design and distribution of resistive material allow even heat distribution throughout the component, eliminating hot spots, unlike the competitors’ products. In addition, using alumina substrate makes heat dissipation quick and efficient.

 

 

FEATURES Smallest size for required wattage Highest wattage for required size No hot spots Low ESL – low noise Excellent current surge tolerance Offered in two popular sizes, 0805 and 1206 Resistance range 1mΩ to 100Ω Resistance tolerance as low as ±0.5%

 

 

ADVANTAGES Space saving for required wattage Highest power for available space Complete RoHS-compliant Over current protection by becoming open (PRL) Attractive pricing Good RF4 board compatibility – no heat burns! Offered in two configurations – longer side terminal and standard shorter side terminal

 

APPLICATIONS Any application that requires current sensing low resistance resistors such as protection and control circuits.

 

 

 

More on Heat Distribution

Here we show a simple diagram demonstrating how heat from resistive film is distributed evenly across the component. Unlike other resistors that have the resistive element in the center of the chip, we have split the resistive element into 2 parts and placed heat dissipative electrode between them. This simple innovative idea has solved the problem of the hot spot. This innovation is even more obvious when comparing our products with bulk type current sensors.

 

 

 

Low Reactance/Inductance

High inductance disturbs signal integrity and creates noise. The choice of material, structural, and trace design of PRL products serves to minimize the amount of inductance/reactance.

 

 

Strong Tolerance to Current/Voltage Surge

The tolerance to high voltage/current surge is related to how the passivation materials and the structure of the component can handle sudden increase of temperature. Susumu’s RL and PRL series that incorporate select materials and structural designs are able to handle such sudden increase of voltage/current. Moreover, PRL will become open when it experiences significant over-current, thus protecting the circuit from overheating.

 

Low Thermal EMF (Electromotive Force)

PL and PRL series exhibit very low thermal EMF between electrodes, resistor and other metal structures. Low thermal EMF guarantees accurate and stable current measurement.

 

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