MEDER electronic, Inc. MMS - 2.8 mm Implantable MEMS Reed Sensors Need No Power
A new, ultra-small magnetically actuated reed sensor that requires no power and is designed for switching CMOS gates and other low power signal switching devices such as implantable medical pacemakers and insulin pumps is being introduced by MEDER electronic.
MEDER MMS Reed Sensors are magnetically actuated on/off sensors that feature no power draw and measure only L2.8mm[0.110”] x W2.05mm [0.080”] x H1.2mm [0.047"]. Designed for switching low power devices where size is critical, they are available with magnetic sensitivity ranges from 1-4 millitesla and are tested to withstand up to 15,000 G's shock from any direction. Choose from 2 surface mount lead designs in a SPST-NO (Form A) version: lead design 1 (straight cut axial lead), and lead design 2 (Gull Wing).
Manufactured using semiconductor wafer technology, MEDER MMS Reed Sensors are supplied in tape and reel according to IEC 286/part 3, suitable for auto pick and place equipment. These SPST reed sensors have a switching voltage of 3 VDC max., with 109 insulation resistance across the contacts. These reed sensors are EDS sensitive and RoHS compliant. Available today at Digi-Key Corporation.
Lake Shore Introduces Model 350 Ultra Low Cryogenic Temperature Controller
Lake Shore Cryotronics, Inc. has introduced the Model 350 ultra-low cryogenic temperature controller. The Model 350 is a powerful physics tool specifically designed to provide improved measurement and control in a wide range of cryogenic physics research applications, including those conducted in high magnetic field and radiation environments.
The full-featured four-input Model 350 cryogenic temperature controller is a world-class refrigeration control solution capable of using very low excitation power. It is designed for the demands of pumped helium-3 refrigerators and similar advanced research platforms. The Model 350 controller provides improved measurement and control accuracy and convenient operation in any cryogenic system from 100 millikelvin (mK) to more than 1000 kelvin (K). Users are guaranteed improved performance even at extremes, and the controller comes with Lake Shore’s full three-year standard warranty to add to customer confidence.
Optimized for use with Lake Shore’s popular and dependable Cernox sensors, the standard Model 350 also supports ruthenium oxide, platinum resistance temperature detectors, and other negative temperature coefficient sensors. The number and type of sensors can be further expanded with a choice of option cards. The Model 350 can automatically switch between different sensor inputs as needed to cover broader measurement ranges, providing continuous measurement.
A variety of features makes the Model 350 well suited for use in ultra-low temperature research applications. Patented low-noise input circuitry enables super low excitation currents for minimal self-heating and high resolution measurement while eliminating errors from grounding inconsistencies.
Four controlled outputs include a powerful 75 W warm-up heater, 1 W sample heater, and two additional 1 W outputs for controlling auxiliary systems. The unit features Lake Shore’s proven user-friendly interface for intuitive setup and simple operation. Temperature control loop auto-tuning facilitates automated set up of control parameters. Remote communications and control using Ethernet, USB, and IEEE-488 interfaces makes for convenient system integration and application coordination. In short, the Model 350 cryogenic temperature controller brings a new level of power, precision, and performance to critical low temperature physics research.
New 120 kHz Bandwidth, High Voltage, 3.3 Volt Current Sensor IC with Integrated Overcurrent Detection
Allegro MicroSystems, Inc. has released an open loop Hall-effect sensor IC with near closed loop performance (in accuracy and bandwidth). Allegro’s ACS716 current sensor IC provides an economical and precise means for current sensing applications in industrial, commercial and communications systems. The device is offered in a small footprint surface mount package that allows easy implementation in customer applications, and is optimized for 3.3 V supply operation.
The ACS716 consists of a precision linear Hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die. Applied current flows through the copper conduction path, and the analog output voltage from the Hall sensor IC linearly tracks the magnetic field generated by the applied current. The accuracy of the ACS716 is maximized with this proprietary packaging configuration because the Hall element is situated in extremely close proximity to the current to be measured.
High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low ripple at output and low offset drift in high-side, high voltage applications. The voltage on the overcurrent input (VOC pin) allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP– pins) exceeds this threshold, the open drain overcurrent fault pin will transition to a logic low state. Factory programming of the linear Hall sensor IC inside of the ACS716 results in exceptional accuracy in both analog and digital output signals.
The internal resistance of the copper path used for current sensing is typically 1 mΩ, for low power loss. Also, the current conduction path is electrically isolated from the low voltage sensor inputs and outputs. This allows the ACS716 family of sensor ICs to be used in applications requiring electrical isolation, without the use of opto-isolators or other costly isolation techniques.
The ACS716 is priced at $1.95 in quantities of 1,000.
Bruker Announces BNL, a Nitrogen Re-Liquefaction Accessory for More Efficient, Sustainable and Economic Magnet Operation in NMR
Bruker has released the BNL (Bruker Nitrogen Liquefier) accessory; available now for its Ascend NMR magnet product line up to 700 MHz. NMR customers can now benefit from extended cryogenic maintenance intervals for improved user convenience, increased flexibility for long-term experiments and lower cost of ownership.
The BNL can be installed on one of the magnet’s nitrogen ports enabling it to re-liquefy the nitrogen gas evaporating from the magnet dewar. The re-liquefaction process is essentially 100 percent efficient, ensuring near zero nitrogen boil-off for Ascend magnets up to 700 MHz. Operators of NMR equipment are freed from the weekly or bi-weekly routine of nitrogen filling, thus reducing cryogenic maintenance to helium refills only, which are typically spaced many months apart. The BNL features a Cryostat Monitoring Unit (CMU) ensuring easy visual status monitoring, while Bruker’s Magnet Information and Control Software (MICS) provides an overview of nitrogen level, pressure and cryocooler temperature.
The BNL development follows the success of the BSNL, the nitrogen reliquefaction accessory that has for several years enabled CryoProbe customers to use the extra cooling capacity of the latest generation CryoPlatform to re-condense the evaporating nitrogen gas from the magnet dewar . The new BNL is an add-on magnet accessory now offering the same benefits for systems without CryoProbes.
“We continuously explore new ideas to improve customer convenience and minimize cryogenic maintenance in NMR laboratories and we are thrilled that the BNL technology is now available for our Ascend magnet series. The BNL maximizes user convenience, avoids interruptions of long experiments, and lowers operational costs, all without compromising NMR performance,” said Dr. Daniel Eckert, VP for Magnet R&D at Bruker BioSpin in Faellanden, Switzerland.
Signal Transformer Announces New Line of SMD Power Inductors Available at Digi-Key
Signal Transformer (a subsidiary of Bel Fuse Inc.) and Digi-Key Corp. have entered into an agreement under which Digi-Key will distribute Signal's 150+ new series of SMD wire wound inductors to customers worldwide.
Signal's RoHS-compliant, Pb-free, SMD wire wound series of inductors are engineered for employment in a broad array of consumer and industrial power applications including test and measurement, automotive electronics, and industrial process control. Encompassing 2,700 standard part numbers, the shielded and unshielded devices are used in DC to DC converters, switch-mode and regulated power supplies, telecommunications equipment, mobile phones, small-size pagers, computers, LCD displays, printers and other peripherals. These inductors are also appropriate in audio and video applications, and in LC resonant circuits such as oscillators and signal generators. In addition, these parts are used in impedance matching, circuit isolation, and RF filters.
Available in extremely low-profile versions, these power inductors exceed industry standards for durability, thermal shock resistance, moisture, shock and vibration. They are capable of handling high peak transient currents without overload concerns. To optimize design flexibility, wide inductance ranges are offered in parts having the same footprint.
"Local access to Signal's SMD wire wound inductors is a tremendous asset to our customers," said Jeff Shafer, Digi-Key's vice president of global interconnect, passive, and electromechanical products. "Our ability to provide design, prototype, and production quantities will enable customers to accelerate time-to-market while ensuring the utmost in quality standards."
"Signal is very pleased to partner with a world class distributor having a global customer base and a reputation for superior service, competitive pricing, and on-time delivery,” said Sandy Axelrad, Signal's general manager. “We look forward to leveraging Digi-Key's experience and market reach, and are confident this distribution agreement will bring tremendous value to design engineers worldwide."
MDT Releases TMR Magnetic Angle Sensors for Rotary Encoders
MultiDimension Technology Co., Ltd. (MDT) has released two Tunneling Magnetoresistance (TMR) magnetic angle sensors for use in a wide spectrum of industrial sensor applications, including rotary encoders, speed sensors, contactless potentiometers, and rotary position controllers for brushless DC motors (BLDC).
Designed with MDT’s unique TMR sensor technology and intellectual property, the MMA253F/MMA153F TMR magnetic angle sensors feature 360° angle measurement, high-amplitude robust output signals, and large air-gap tolerance. MDT’s TMR magnetic angle sensors lower the complexity of the signal processing circuitry.
“We are passionate about offering all the benefits of TMR sensor technology to our customers with multiple service options to best suit their needs,” said Dr. Song Xue, Chairman and CEO of MultiDimension Technology. “In addition to supplying TMR magnetic sensor chips, we are open to delivering entire system solutions upon request. We can custom-design TMR sensor wafers for high-volume customers to integrate with their own ASIC technology.”
Dr. Xue noted that MDT’s new TMR magnetic angle sensors reduce the overall system cost of rotary encoders because of their lower power, high precision, and large stable output signals. They provide a simple solution to integrate with analog or digital circuitry.
MDT’s TMR sensor technology combines the key benefits of existing magnetic sensor technologies such as AMR (Anisotropic Magnetoresistance), GMR (Giant Magnetoresistance), and Hall Effect, while overcoming their limitations, such as low signal sensitivity (Hall, AMR, and GMR), and design complexity for 360-degree measurement (AMR).
The MMA253F/MMA153F TMR magnetic sensors are immediately available for sampling. An evaluation toolkit, the MMA253F-EVL, is also available for users to assess the electrical and magnetic characteristics of the MMA253F sensor. The MMA253F-EVL toolkit provides an LCD display, a USB interface, and 12-bit digital outputs that can be used in absolute or incremental rotary encoders.