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IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments" is a standard that was used to define referencing naming systems for collections of electronic equipment. IEEE 200 was ratified in 1975. The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter.
DigiKey is the fourth largest electronic component distributor in North America and the fifth largest electronic component distributor overall. [3] Stordahl privately owns the company. [4] The name "Digi-Key" is a reference to the "Digi-Keyer Kit," a digital electronic keyer kit that Stordahl developed and marketed to amateur radio enthusiasts.
The codes given in the chart below usually tell the length and width of the components in tenths of millimeters or hundredths of inches. For example, a metric 2520 component is 2.5 mm by 2.0 mm which corresponds roughly to 0.10 inches by 0.08 inches (hence, imperial size is 1008).
Example part numbers are any of TE Connectivity / AMP 170204-* (loose pieces) or 170262-* (pieces supplied in strips), where * is 1 or 2 or 4. [ 2 ] [ 3 ] The male PCB connector on the 3½-inch floppy drive is normally a polarized right-angle male header, which is a TE Connectivity / AMP 171826-4, [ 4 ] the straight model is AMP 171825-4.
A business using a part will often use a different part number than the various manufacturers of that part do. This is especially common for catalog hardware, because the same or similar part design (say, a screw with a certain standard thread, of a certain length) might be made by many corporations (as opposed to unique part designs, made by only one or a few).
The errors can be minimized through proper design — by keeping all junctions at the same temperature, and by employing only metal pairings with low thermoelectric coefficients (down to the external connectors and cables used; for example, a standard 4 mm plug/socket combination may have a coefficient of 1 μV/°C compared to only 0.07 μV/°C ...
Thin film resistors are usually far more expensive than thick film resistors. For example, SMD thin film resistors, with 0.5% tolerances and with 25 ppm/K temperature coefficients, when bought in full size reel quantities, are about twice the cost of 1%, 250 ppm/K thick film resistors.
IP - intellectual property (now part of embedded systems division) ModelSim LE - Nanometer IC Design: digital design and simulation; Linux-based simulator with Dataflow Window and Waveform Compare; ModelSim PE - Nanometer IC Design: digital design and simulation; Windows-based simulator for VHDL, Verilog, or mixed-language simulation environments
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