FRFC flip chip resistors offer ultra-stable performance

Compared with surface-mount chips with wraparound terminations, the flip chip configuration of the FRFC series provides PCB space savings of more than 35%. The FRFC series owes its high-performance characteristics to a resistive element based on Z1 Foil Technology, a solid alloy that is matched to the ceramic substrate with polyimide bonding to enable a uniform thickness of the bond line, superior adhesion strength, and improved resistance to moisture.

Virtually insensitive to destabilising factors, the FRFC series features a temperature coefficient of resistance (TCR) or ± 0.2 ppm/°C (-55°C to +125°C, +25°C ref), ESD immunity to 25 kV or more, and noise-free operation. Its power rating is 750 mW at +70°C, a 25% improvement over the VFCP series, which is already a superior product in the high-precision resistors industry.

The FRFC series flip chip resistors are offered in the 0805, 1206, 1506, 2010, and 2512 case sizes, with power TCR (ΔR due to self-heating) of 5 ppm at rated power and tight tolerances to ±0.01%. "The FRFC series devices provide designers with the most stable resistors available today — allowing them to achieve new benchmark levels in performance," said Jacky Acoca, Vishay Foil Resistors Director of Sales and Marketing. "In addition to saving on board space, the devices' flip chip terminations increase reliability by providing better strain relief to eliminate cracked substrates and board delamination."

The FRFC series flip chip resistors are optimised for a wide range of high-precision industrial, telecommunications, medical, and laboratory applications, including bridge networks, gyro navigational controls, pressure sensors, standards and decade boxes, process controls, weighing systems, electron beams, and automatic test equipment.

The new resistors offer a resistance range from 5Ω to 125kΩ with any conceivable ohmic value within this range — out to six digits — available with no additional cost or lead time effect. They feature a rise time of 1.0 ns with effectively no ringing; a thermal stabilisation time of <1 s (within 10 ppm of steady state value); current noise of 0.010 μVrms/V of applied voltage (<-40 dB); and a voltage coefficient of <0.1 ppm/V.

The RoHS-compliant FRFC series resistors offer a non-inductive (<0.08 μH), non-capacitive design and are available in matched sets upon request.