Author Archives: steve bush

Semtech launches LoRa tranceivers for IoT WANs

SX1261 and SX1262 are sub-GHz LoRa transceivers from Semtech, designed to extend battery life by operating at 4.2mA active receive consumption. “The transceivers support LoRa modulation for low power wide-area network applications, as well as (G)FSK/MSK modulation for legacy applications, and include a new spreading factor of SF5 for dense networks,” said distributor Mouser, which is ...

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Thyristors and diodes for automotive

Aiming at on-board battery chargers, Vishay has released a family of high-voltage thyristors and diodes qualified to AEC-Q101. There are 37 all together, in three packages: surface-mount DPAK (TO-252AA) surface-mount D²PAK (TO-263AB) through-hole TO-247AD The nine thyristors deliver continuous on-state current from 12 to 79A rms, while the diodes, both standard and fast recovery types, offer ...

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Solar facades need to last longer

Longer life with good transparency will need to be achieved if solar facades are to become common on buildings, according to a report by market research company IDTechEx. ‘Smart glass and windows 2018-2028: Electronic shading and semi-transparent PV‘ identifies gigawatt hour potential from glass building cladding and windows that include photovoltaic layers, but identifies multiple factors ...

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Super caps for tough environments

Vishay has introduced a series of ruggedised  electrical double-layer energy storage capacitors for energy harvesting and power backup applications in harsh, high humidity environments. Values span 20 to 60F, at up to 2.7V, although rated voltage drops to 2.3V at +85°C. There are eight case across 16mm diameter x 20mm, to 18 dia x 40mm ...

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Oxide transistor printed around 1mm tube, for medical diagnosis

Transparent transistors have been fabricated around glass tubes of 2mm diameter, at Oregon State University. It replaces a polymer transistor, printed on film and wrapped around the tube, which fell apart when tested as part of an artificial pancreas – a catheter intended to detect blood sugar levels and transmit the information to a wearable ...

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All-optical circulator-isolator demonstrated without magnetic bias

An all-optical four port isolator has been demonstrated by the University of Science and Technology of China (USTC), without the use of magnetic fields. For the circulator (see diagram) the signal light incident from the ports 1, 2, 3 and 4, exits from the ports 2, 3, 4 and 1, respectively, constituting a 1-2-3-4-1 circular ...

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Longer life from lithium-sulphur cells, but still not enough

The life of lithium-sulphur batteries can be extended from ~100 to >200 charging cycles, according to researchers from Purdue University. This compares with ~600 cycles for common laptop Li-ion cells and far more from specialist types. When charge is applied to Li-S cells, lithium ions migrate to the sulphur and lithium sulphide is produced. A ...

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Longer life from lithium-sulphur cells, but still not enough

The life of lithium-sulphur batteries can be extended from ~100 to >200 charging cycles, according to researchers from Purdue University. This compares with ~600 cycles for common laptop Li-ion cells and far more from specialist types. When charge is applied to Li-S cells, lithium ions migrate to the sulphur and lithium sulphide is produced. A ...

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Two-pin current source works at 400V for LEDs

Diodes Inc has created a family of two-pin constant current chips that can work at up to 400V. Intended to control strings of LEDs running direct from rectifier mains, and called AL5890, it is available 10mA, 15mA, 20mA, 30mA, and 40mA variants “Its simple two-pin design means it can be inserted directly in the LED ...

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3 axis MEMS accelerometer with 10 year production life

STMicroelectronics has announced high-stability MEMS sensors with 10-year product-longevity assurance – to be available later in 2018. Called IIS3DHHC is a 3-axis accelerometer with ±2.5gravity full-scale range, optimised for high measurement resolution and stability to ensure accuracy over time and temperature (<0.4 mg/°C) – operation is over -40 to +85°C. “Among key differences between this ...

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