MicroCrystal RV-8803 – A Really Accurate RTC June 17, 2019- RTC chips traditionally were the domain of Maxim and NXP. Switzerland-based MicroCrystal recently made quite a buzz with its RV-8803, which offers simple integration, an I2C interface and extreme accuracy. Let us start out by looking at a system overview. Figure one shows how this I2C RTC is made up internally – interested observers note […] Analog Devices’ LTM2887 – If a Digital Bus Needs Galvanic Isolation June 15, 2019- In theory, digital buses are intended to connect things to one another. Sadly, one sometimes wants but a logical connection – in many cases, galvanic isolation helps out. Should you ever feel like isolating very fast buses, definitely give the LTM2887 a chance. From a technical point of view, Linear Technologies attempt at entering the […] AVAGO APDS-9008 or APDS-9005-020 – Keeping an Eye on Ambient Light June 14, 2019- Recent times saw quite a bit of interest for part numbers such as the APDS-9008 or APDS-9005-020 – they are a very interesting type of ambient light sensor. One of the oldest questions in regards to light sensors involves their spectral sensitivity. If a part is to output but one voltage level, the conversion between […] STMicroelectronics’ LIS2DH12 – Low Power Motion Sensing June 12, 2019- Apple’s iPhone introduced gyroscopic sensors to a wider range – before that, accelerometers were not commonly found in consumer hardware. STM sells excellent parts which, however, get little media attention – time to take a look at the LIS2DH12. Integrating the part into your circuit as an MPU6500 alternative or MPU9500 alternative is not difficult. […] Panasonic AMG8833 – FLIR for cheap June 7, 2019- FLIR made infrared thermal sensors cool – sadly, their parts are all but cheap (and suffer from export control problems). Panasonic’s Grid-EYE family is a low-resolution alternative which comes at significantly lower cost. From a technical point of view, Panasonic’s image sensor could not be simpler. We are looking at an 8×8 sensor with an […] DipTronics DTS-62R-V – Small Switch, Very Big (and Very Cheap) June 5, 2019- When yours truly was but a lowly cadet, various US manufacturers produced (pricey but quite reliable) switches. Chinese vendors recently started to catch up – seeing the DTS-62R-V top our customer interest list shows that the run stage of the crawl-walk-run cycle is reached. DipTronics has been around the Asian switch market for ages, exhibiting […]
In the age of the IC, transistors usually are not considered particularily interesting. However, some MOSFETs stand in the center of attention – let us be your guide to some cool components.
Crees C3M0065090J is not particularily impressive from a purely technical point of view – its main secret, instead, lays in the land layout shown in figure 1.
…Smart land layouts lead to reduced creepage current potential
Cree forgoes the dedicated drain pin, and instead exposes this part of the semiconductor crystal using the tab normally used as a heatsink. When combined with the rest of the circuit layout, a spacing of more than 7mm is achieved – this helps reduce creeping currents, which can be a problem at high voltages or in precision designs.
CREE furthermore promises a Drain – Source Voltage of 900V, which also makes the part well-suited to “rectifier” type activities.
Better Be Mindful
Part number two is IR’s irlml5203pbf – a classic which has been on the market for some time, but keeps generating significant spikes of search interest. When first introduced, the idea of packing a full HEXFET module into a SOT23 module was considered odd.
By now, the concept established itself. This does not, however, mean that the parts are not recommended for new designs: the on-resistance values shown in the figure still are respectable.
…If power is at a premium, reducing losses can help
IR recommends that parts such as the irlml5203pbf or its sister part irlml6402pbf should be used in PCMCIA cards and similarly space-constrained settings. One classic application would be “low drop diodes” and similar polarity protection – in this case, however, take care to not exceed reverse voltage limits.
Finally, allow us to point you at here and here in case you never thought of using a FET as a reverse polarity protection component. Their extremely low voltage drop makes them effective in “corner cases” such as an automotive cold crank; losing 0.7V can make a world of difference…