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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.
TO-126: Plastic-encapsulated package with three leads and a hole for mounting on a heat sink; TO-220: Through-hole plastic package with a (usually) metal heat sink tab and three leads; TO-226 [23] TO-247: [24] Plastic-encapsulated package with three leads and a hole for mounting on a heat sink
The heat sink thermal resistance model consists of two resistances, namely the resistance in the heat sink base, , and the resistance in the fins, . The heat sink base thermal resistance, , can be written as follows if the source is a uniformly applied the heat sink base. If it is not, then the base resistance is primarily spreading resistance:
7805 in TO-220 and TO-92 packages Internal die of a Tesla MA7805 78xx (sometimes L78xx , LM78xx , MC78xx ...) is a family of self-contained fixed linear voltage regulator integrated circuits . The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost.
LM317 with heat sink. The LM317 is an adjustable positive linear voltage regulator. It was designed by Bob Dobkin in 1976 while he worked at National Semiconductor. [1] The LM337 is the negative complement to the LM317, which regulates voltages below a reference. It was designed by Bob Pease, who also worked for National Semiconductor. [1]
NXP 7030AL - N-channel TrenchMOS logic level FET IRF640 Power Mosfet die. The power MOSFET is the most widely used power semiconductor device in the world. [3] As of 2010, the power MOSFET accounts for 53% of the power transistor market, ahead of the insulated-gate bipolar transistor (27%), RF power amplifier (11%) and bipolar junction transistor (9%). [24]
The device is designed to operate with an efficient heatsink, but care must be taken to mount the device properly, [7] [8] [9] else physical damage or worsened power handling may result, especially with cases or heatsinks that are not perfectly flat. 2N3055 transistor mounted on an aluminum heat sink.
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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