A double space saving is provided with the 500mA resistor equipped transistors (RETs) said Nexperia. They integrate bipolar junction transistors and resistors in a single package to enable high-power load switching in space constrained applications.
The 12 RETs are in compact DFN2020(D)-6 packaging and designed for load switching in wearables and smartphones as well as for use in digital circuits with higher power requirements, such as space constrained computing, communications, industrial and automotive applications.
The RET in DFN configuration achieves dual space-saving feats, said Nexperia. Firstly, integrating the bipolar junction transistor (BJT) and resistor into a single package offers substantial board space savings and secondly, the leadless DFN packaging contributes to space savings.
The RETs deliver the specified 500mA output current from a tiny DFN2020(D)-6 package measuring only 2.0 x 2.0 x 0.65mm. This packaging is particularly suitable for thermal performance in high power applications, delivering up to 1W total output power from collector-emitter voltages (VCEO, open base) up to 50V.
Wearable
Micropower switches extend batteries for IoT
Two low power Hall effect switches, the MLX92216 and MLX92217, have 1.0 microwatt power consumption and narrow tolerances for a predictable power budget, helping to extend battery runtime, said Melexis.
These magnetic devices detect open or closed positions and can replace traditional reed switches in IoT and industrial or white goods.
The growing demand for smart devices to be battery-powered but long lasting is a challenge for IoT. The need for low power components which are both reliable and accurate is paramount, said Melexis.
The MLX92216 and MLX92217 microwatt switches are three-wire monolithic magnetic switches which are claimed to deliver industry leading accuracy, consistency and reliability throughout the lifetime of the application. Unipolar, omnipolar and latch variants are available, making the device suitable for applications such as lid close/open detection, wearables, industrial machines, appliances, tablet cases, valves, energy and flow meters, while also serving as a replacement for traditional proximity and reed switches.
The switches have an integrated logic for automatic sleep/awake sequencing enabling 0.9 microA average current consumption with no action necessary from the user (depending on the model variant). The MLX92217 has an ‘enable’ pin that allows users to activate or deactivate the automatic sleep logic, driving the standby current consumption down to 200nA whilst still ready to be woken up by the system. Paired with min/max tolerance variation (less than 50 per cent), these devices provide a stable power budget and longevity, including peak current consumptions of less than 1.5 microA.
Compact VCSEL proximity sensor lends an ear to miniaturisation
Rohm has developed a compact 2.0 x 1.0mm proximity sensor, the RPR-0720. It is optimised, said the company, for applications requiring attachment/detachment and proximity detection, for example in wireless ear buds and wearable devices. Sensor devices are evolving, driven by miniaturisation and a requirement for functionality. Rohm’s portfolio of proximity sensors combine light emitting and receiving elements in a single package. They are used in a range of applications, from mobile devices to industrial equipment. In wearable device design in particular, there is growing demand for small proximity sensors that can support improved designs and an increase in the number of parts resulting from higher functionality. Rohm said the RPR-0720 is an optical sensor module developed for this sector. The compact proximity sensor integrates a VCSEL and sensor IC. The RPR-0720 optical sensor module adopts a VCSEL featuring higher directivity than LEDs as the light emitting element and a sensor IC for the light receiving element. The compact size is achieved by optimising the module structure using in-house chips. The result is an area reduced by approximately 78 per cent compared to conventional products, said Rohm.
Single mode LTE Cat 1bis IoT module is smallest yet, says u-blox
The u-blox LEXI-R10 is a compact module for applications requiring medium data rates. The small LTE Cat 1bis IoT module measures 16 x 16mm.
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