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 […]
Through-Hole Connectors Going Strong
SMD inductors are a common culprit for TMI failures – if a HP 34401A croaks, checking input coils is a great idea. Nevertheless, engineers keep using SMD parts in this area. An interesting question is how developers think about SMD connectors.
Having analysed search trends for both SMD and THT connector searches, the trend is clear – throughhole comes out on top.
This is valid all over the block. A “conventional” candidate would be the USB3145-30-1-A by GCT; it implements traditional USB, but comes with a neat twist of being rectangular. This means that insertion forces do not bend the connector – removal can, of course, strain the solder joints.
Of course, the automotive market and its high vibration and high reliability demands come with their own caveats. While SMD usually is better for cars as the lower mass lowers stress cracking, connectors such as the DT13-08PA are THT as they can dissipate connection and disconnection stresses more efficiently.
Finally, friends of odd connectors can feast their eyes on the nf2d-b-2 by Neutrik. It is an RCA connector which has to be soldered in; an interesting approach which was used to great success on systems such as the SolarTron 7150. Mechanical mounting must then be done with a set of screws, as seen in the figure.
…Physical and electrical positioning are two different problems
THT and SMD connectors usually do not give one another much in terms of price. The extra price for the drill holes usually is insignificant, PCB layouts can even become smaller in one plane. However, word on the street has it that reflow soldering machines gravely dislike headers and similar elements – touching base with your manufacturing partner is very recommended.
While engineering usually is not a black and white subject matter, the voice of the people seems clear when connectors are concerned. Going THT might increase prices slightly; the increased reliability makes it worth your while most of the time…