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The TO-220 package is a "power package" intended for power semiconductors and an example of a through-hole design rather than a surface-mount technology type of package. TO-220 packages can be mounted to a heat sink to dissipate several watts of waste heat. On a so-called "infinite heat sink", this can be 50 W or more.
Plastic small-outline no-lead package: QSOP: Quarter-size small-outline package: The terminal pitch is 0.635 mm. [3] SOIC: Small-outline integrated circuit: Also known as SOIC NARROW and SOIC WIDE: SOJ: Small-outline J-leaded package SON Small-outline no-lead package SSOP: Shrink small-outline package [3] TSOP: Thin small-outline package [3] TSSOP
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Eurocard is an IEEE standard format for printed circuit board (PCB) cards that can be plugged together into a standard chassis which, in turn, can be mounted in a 19-inch rack. The chassis consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf.
The two pins of the TO-41 package end in soldering pads with holes in them to make it easier to solder wires to the pins for point-to-point construction (as opposed to soldering a TO-3 package on a printed circuit board). Otherwise the TO-41 package has the same dimensions as the TO-3 package. [6]
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Vishay Semiconductor have released 20W resistors in TO-220 form. so this indicates the expected heat dissipation of the package with a heatsink. source: "TPR Thick Film Technology 20 Watt Power Resistors TO-220 Package". there are 50W zeners in TO-3, and 10W in DO-4, 100W in DO-5 (for comparison). Charlieb000 21:22, 3 August 2012 (UTC)
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