December, 2015
www.us-
tech.com
Tiny Components Find Homes in Smaller Circuits Continued from page 49
driven by customer demands for smaller final products that will operate with lower energy con- sumption, but also by manufacturers’ desires to cut costs by reducing the amount of materials used in a production line. As semiconductor processes have evolved to produce high-density ICs with thousands of transistors on a microscopic chip, designers of fundamental passive circuit elements, such as resistors, capacitors, and inductors, have sought ways to reduce the sizes of these circuit ele- ments to miniaturize essential passive compo- nents, such as filters.
Made in USA An important innovator of passive compo-
nents, Gowanda Electronics (
www.gowanda.com), offers a wide range of magnetic-based inductors, including RF, power and high-frequency conical inductors. The firm has also developed an impres- sive lineup of nonmagnetic inductor products that are especially suitable for medical applications or other circuits where magnetic mate- rials may compromise performance. One example is in magnetic reso- nance imaging (MRI) systems, which have proven invaluable for medical diagnostic analysis. Higher induc- tance is often the driving force in nonmagnetic applications although smaller size can trump inductance in some situations. Gowanda’s nonmagnetic induc-
tors are available in many different forms, including wire-wound RF induc- tors for through-hole circuit mounting, RF surface-mount inductors, and even custom nonmagnetic inductors for application-specific designs. An example of the through-hole
nonmagnetic inductors, model 15MG 471K offers an inductance value of 4.7µH with ±10 percent inductance tolerance and minimum quality fac- tor (Q) of 33 measured at 7.9MHz. The minimum self-resonant frequen- cy (SRF) is 90MHz. The compact
Miniaturization is a strong trend in
electronic components, including transform- ers such as this 75W component, which
operates from 40 to 1250MHz and measures just 0.15 × 0.15 ×0.16 in. with special surface-mount packaging approach.
pliant (lead-free) versions. In addition, the compa- ny, whose products are all made in the USA, has the distinction of selling a number of components to manufacturers in China.
Page 51
Making MEMS Work In recent years, increasing use of micro-
electromechanical-systems (MEMS) technology has resulted in many components with electro- mechanical functions, such as switches and pres- sure sensors, growing smaller just like their pure- ly electronic counterparts. In particular, MEMS components are being used increasingly in auto- motive and medical applications. For example, MEMS devices are widely used as airbag sensors in commercial vehicles and are now usually employed in passenger automobiles that support vehicular safety technologies such as electronic stability control (ESC) and tire-pressure-monitor- ing systems (TPMS). In medical devices, MEMS technology is often the basis for temperature sen- sors and heart-rate monitors. In addition, MEMS sensors and actuators are used in many consumer electronics products, such as smart phones and computer tablets. Both Japan and China have developed strong manufacturing capabilities in Continued on next page
SCIENCE knows why it works.
CARE knows why it’s important that it does.
This miniature MEMS-based component is an audio SMT microphone with minimal
height that finds widespread use in consumer electronics
applications, including laptop computers and cellular telephones.
inductor is rated for 260mA current and operating temperatures from –55 to +125°C. It is only 0.375 in. (9.5 mm) long. When nonmagnetic inductance
must be added to a circuit in a small surface mount package, the same- value (4.7µH) inductor is available from Gowanda as a wirewound com- ponent in a molded housing measur- ing just 0.49 x 0.23 in. (12.4 x 5.8 mm) as model SMG5025-471K. It has a minimum Q of 33 at 7.9MHz and minimum SRF of 90MHz. It is rated for 375mA current and operating temperatures from –55 to +125°C. If high inductance is the ultimate
parameter, SMG8527-821K provides 8.2µH inductance in a 0.86 x 0.26 in. (21.8 x 6.6 mm) package. If small size is the most important feature, the model SMG1812-082M is offered in a 0.165 x 0.118 in. (4.2 x 3.0 mm) pack- age with 0.082µH inductance). All of these wirewound product families are available as RoHS-com-
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