Ultra-high-precision flip chip COTS resistors offer extended resistance range down to 5-Ohms
The devices feature ultra-low TCR of ±0.05 ppm/°C nominal (0°C to +60°C) and ±0.2 ppm/°C typical (-55°C to +125°C, +25°C ref.) and load-life stability of ±0.005% at 70°C for 2,000 hours at rated power and ±0.01% at 70°C for 10,000 hours.
Available in five chip sizes ranging from 0805 to 2512, the VFCP series offers high power ratings up to 600 mW at +70°C and an excellent power coefficient (ΔR due to self-heating) of ±5 ppm at rated power. The devices feature a wide resistance range from 5 Ω to 125 kΩ, with tight resistance tolerance to ±0.01%.
Any conceivable ohmic value within this range, to six digits, is available with no additional cost or lead time effect. Matched resistor sets are available by request.
The low TCR of VFCP resistors across a wide temperature range makes them suitable for the high demands of cryogenic applications. The flip chip devices are qualified as anti-sulfurated resistors for use in environments with high levels of contamination. In addition, the devices are ideal for use in many alternative energy, RTD, Li-ion battery, 4 mA to 20 mA current loops, and smart grid applications in which analog circuitry operates under severe environmental, thermal, and mechanical conditions. Designing and manufacturing equipment for these applications involves extreme challenges that seemed insurmountable until a few years ago. The challenges have an impact on the design of analog circuits and the role and expectations of precision resistors, which must be ultra-stable, ultra-reliable devices with an extremely low total error budgets.
Harmonic distortion is an important consideration in the choice of precision resistor. A signal voltage across the resistor may change the resistance value depending on the device’s construction, material, and size. Under these conditions, Bulk Metal Foil resistors behave more linearly than other resistor types. Featuring a non-inductive (< 0.08 μH), non-capacitive design, VFCP devices offer a rise time of 1.0 ns with effectively no ringing, a thermal stabilization time of <1 s (within 10 ppm of steady-state value), current noise of 0.010 µVrms per volt of applied voltage (< -40 dB), and a voltage coefficient of <0.1 ppm/V. The resistors are immune to extraordinary incidents such as radiation exposure and withstand ESD spikes to at least 25 kV.
The VFCP resistors’ one-side terminations ensure secure contact during the manufacturing process and save up to 35% PCB space compared with a surface-mount chip with wraparound terminations while also providing better strain relief to eliminate cracked substrates and board delamination. The devices are available with both lead (Pb)-free and tin/lead alloy terminal finishes.
Availability
Samples and production quantities of the Z-Foil resistors are available now, with lead times of five days for prototype samples and two days to six weeks for standard orders from VPG’s Precision Centers and catalog houses around the world.
More information about the VFPC series at www.vishayfoilresistors.com
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