New Industry Products

Bourns Precision Current Sense Resistor Line Offers New Smaller Package Sizes that Match Mobile Device Requirements

June 23, 2021 by Bourns

This article highlights Bourns Model CFN Metal Foil Current Sense Resistor Series.

RIVERSIDE, Calif., - Bourns, Inc., a leading manufacturer and supplier of electronic components, today announced the availability of smaller package sizes and feature options in its Model CFN Metal Foil Current Sense Resistor Series. New miniature 0402 and 0603 packages were introduced to the Model CFN series as well as a lower TCR option of ±50 ppm/°C in the 0603 and larger package sizes. Using Bourns’ metal foil technology construction enables the new current sense resistors to provide low TCR, low inductance, low noise, excellent reliability and very low resistance values. These attributes make the Model CFN series an optimal current sensing solution for power supply, stepper motor drive, and input amplifier applications. The new smaller sizes are particularly well-suited to meet the space-constrained requirements of mobile device designs.

Ever important in current sensing is having a suitably low TCR, which is determined by characteristics such as the materials used in the resistive element, power rating, and physical size of the component. Bourns has leveraged metal foil technology to achieve lower resistance values, ranging from 5 to 40 milliohms, and still provide power ratings of 0.25 to 1 W in components small enough for mobile applications. Combining the new ±50 ppm/°C option with the low resistance values helps minimize self-heating so the resistor remains reliable and stays within its 1-5 percent tolerance over time.

The structure and mounting style of the Model CFN series is beneficial as well. Placing a metal foil resistive element on the bottom side of the ceramic substrate shortens the thermal pathway and improves heat dissipation characteristics. The rear mount style helps prevent surface damage during assembly that otherwise could cause a short. The expanded offering meets the demands of an increasing mobile market and delivers reliability and stability on all fronts.

The Bourns® Model CFN Metal Foil Current Sense Resistor Series is available now in all variations, and is RoHS compliant* and halogen free**. For more detailed product information, please see this link


About Bourns

Bourns provides a broad array of magnetic components and solutions to meet a variety of application needs. Bourns® magnetic component product portfolio includes chokes, filters, inductors, transformers and J.W. Miller® Magnetics. Bourns continues to be a leading supplier of small high current power inductors that feature higher currents and lower DCRs, and common mode chokes that offer improved core materials for enhanced efficiency. Bourns® magnetic products are an optimal solution for applications in the following markets: computer, communication, instrumentation, industrial and medical.