At 3.2 x 1.5 mm and a 0.9 mm profile, this is the smallest miniature watch crystal available. It is made for tight quarters, such as in portable or handheld devices. It has a frequency of 32,768 kHz, and the surface mount device offers a standard 12.5 pF load capacitance in the FX135A model, and an optional 9 pF capacitance in the FX135B. With a standard operating temperature of -40 to 85C (-40 to 185F), it has a frequency stability of -0.045 ppm/( C )2 and a frequency tolerance of +/-20 PPM at 25C (77 F). Turnover temperature range is 20 to 30C (68 F to 86 F) and storage temperature is -55 to 125C (-67 to 257F). It has a maximum equivalent series resistance of 50 k and insulation resistance of 500 M at 100 VDC. It has a gold-over-nickel finish, and aging is ±3 PPM per year. It is RoHS-compliant. The crystal comes standard in a 3,000-unit taps and reel.
Smith Electric Vehicles teamed with Trans Tech Bus to roll out a 42-passenger, 26,000-lb electric bus called the Newton eTrans, which it hopes will change the way children get to school every morning.
Doug Conner's self-starting, solar-powered Stirling engine runs all year when the sun is visible from the sculpture’s location. The engine can shut down when the sun isn’t visible, and it can restart by itself when the sun comes back up.
Thanks to embedded electronics, medical devices are getting smaller and smarter than ever. Pacemakers and implantable defibrillators are now able to call physicians. MRIs, CT scanners, and ultrasound machines are gaining mobility. And the venerable Band-Aid may soon be able to detect illnesses ranging from fevers to heart arrhythmias. On February 21, join Design News senior editor Charles Murray for a wide-ranging discussion, "Embedded Angles for Medical Products," which will explore the latest developments in medical electronics. The discussion will examine advances in medical device technology and offer an inside look at the embedded electronics behind it.
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