Malvern, Pa. Vishay Intertechnology Inc. has expanded its line of silicon-based RF capacitors with the introduction of the HPC0201A devices that are packaged in a small 0201 case size. The company said the small package size will help designers improve the performance and reduce the size of next-generation wireless products.
Based on a proprietary Vishay semiconductor process, the new HPC0201A silicon capacitors enable higher-performance, higher-precision operation at high frequencies while delivering low parasitic inductance and tight tolerances, said the company.
Compared with conventional RF capacitors, the HPC0201A silicon capacitors offer extremely stable capacitance over a wide range of frequencies from 1 MHz to several GHz. The semiconductor construction also provides low equivalent series resistance (ESR) values, high Q factors, an ultra-high self-resonant frequency (SRF), and low parasitic inductance of 0.035 nH. For example, at 39 pF, the HPC0201A offers twice the capacitance in one-fourth the space required by conventional RF capacitors in the 0402 size.
Available in 44 standard capacitance options ranging from 0.4 pF to 39 pF with tight tolerances as low as ±1 % or 0.05 pF, the new RF capacitors are rated for 6-V, 10-V, 16-V, and 25-V operation. Devices with non-standard capacitance values and with lead (Pb)-free solder are available on request. The devices measure 0.024 x 0.012 inch (0.61 x 0.30 mm) with a low 0.009 inch (0.23 mm) height profile.
The single-side contact configuration of the HPC0201A eliminates the "tombstoning" problem that plagues board assembly when using conventional capacitors with wraparound terminations. The smooth, flat silicon surface of the HPC0201A simplifies pick-and-place operation, making board assembly faster and more efficient. Yet, the HPC0201A capacitors fit on exactly the same pads designed for conventional wraparound terminations.
Typical applications include voltage-controlled oscillators, filter networks, matching networks, and RF modules for wireless communications products including mobile phones, cordless phones, and global positioning systems. They are also used in medical applications such as implantable defibrillators.
Samples of the HPC0201A silicon capacitors are available, with delivery from stock to ten weeks for production quantities. Typical pricing (U.S. delivery) is $0.058 each for devices with ±2% tolerance in production quantities. Design kits are available.
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