Jane123

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  1. hey all: i drew the diagram and connected the circuit according to the datasheet of LM2596, and i checked a few times, i forget to buy a IN5822 diode, so it's not in the board. could this IN5822 trigger this overheating problem? PS: the power supply was not hot at all when i use the 5v (in the right of the diagram in the pictures i uploaded), so what could be the problem? i am detecting and i put this here the same time to see if anybody could help me a bit. thanks in advance.
  2. If you ever tried well known sensors series SHT2x, probably you´ve been surprised by their small dimensions (3,2x3,2x2mm). However the new sensor SHTC1 shifts dimensions a level further, or better said - lower. The result is a DFN package with dimensions of only 2x2x0.75mm, what in praxis represents a package, which you may not notice at a cursory look at a populated PCB. I am wondering if this is the reason why the SHTC1 is primarily intended for mobile applications and everywhere, where a spared space and a minimal power consumption are beneficial?
  3. Vishay today announced that it has extended its E/H series of MIL-PRF-55342-qualified thin film surface-mount resistor chips to offer an S level failure rate of 0.001 % per 1,000 hours in 12 case sizes. The QPL devices are qualified to TCR characteristics E, H, K, L, and M. The enhanced resistors' established reliability is assured through 100 % screening and extensive environmental testing that includes 100 % group A, power conditioning, and Group B lot testing, through which the devices have been rated and approved for an S failure rate level. The Vishay Dale Thin Film MIL-PRF-55342 resistors were verified in qualification to the American Society for Testing and Materials (ASTM E-595) standard test method for total mass loss (TML) and collected volatile condensable materials (CVCM) from outgassing in a vacuum environment for space level requirements. Intended for high-reliability military and aerospace applications with stringent performance requirements, the E/H series' all-sputtered wraparound terminations ensure excellent adhesion and dimensional uniformity. The MIL-PRF-55342 thin film devices feature an electroplated nickel barrier layer for operating conditions to + 150 °C, a TAMELOX resistive element, and a high-purity alumina substrate for high power ratings to 1000 mW. In addition to very low noise of less than - 25 dB and a low voltage coefficient of < 0.1 ppm/V, the resistors offer an absolute TCR down to ± 25 ppm/°C, laser-trimmed tolerances down to 0.1 %, and a resistance range from 10 Ω to 6.19 MΩ, depending on case size and TCR characteristics. The MIL-PRF-55342 thin film devices provide a shelf-life stability of ± 0.01 % and are offered in antistatic waffle pack or tape-and-reel packaging. Knowing more, visit: http://www.kynix.com/Blog/