Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [to220]

Three-pin PTH package with a heat sink tab for medium power components. Often used for MOSFETs, BJTs and voltage regulators.

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Practical current limit for TO-220 package

I see a lot of MOSFET transistors with suprisingly high continuos currents in TO-220 packages. To make matters more magic open ressistance is very low. For example I want to use IRFB7545PbF N-MOSFET transistor. In datasheet, there's stated that…
Viliam
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Why does the LM317 have such a thin metal tab?

Take a look at the pictures below. The TO-220 with a thin tab is the LM317 (STMicroelectronics) and the TO-220 with the thicker tab is the IRF540N (International Rectifier). If you take a look at the thermal resistances of the two TO-220s, you…
Prathik Prashanth
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What is the difference between TO-220F and TO-220FP cases?

Google search results imply TO-220FP to be full-pack case. Wikipedia says that TO-220F is full-pack case. Farnell categorizes TO-220F and TO-22FP differently. I'm confused. What is the difference between these two TO-220 case versions?
hkBattousai
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What screw should I use to mount a TO220 package?

What screw size should be used to mount a TIP31 in a TO220 package to a bare PCB (no heatsink?) I presume a nut will also be required on the other side, so would appreciate a part number for that too. (I'm not too clued up on mechanical stuff, so go…
Thomas O
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Heatsink earthing?

I'm currently working on my first circuit that dissipates enough power that I need to use a heatsink. The component in question is a TS1085CZ33 which I'm running with a maximum load of 2.8A dissipating around 7.5W. I'm just wondering a couple of…
Jules
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Does this TO-220 Package Resistor need a heatsink?

I purchased this 0.5 Ohm power resistor, which comes in a TO-220 Package, with the aim of pushing 3A through it (i.e. 4.5W) The datasheet has the following information: It says it will rise 6.5 K/W, so it should rise 29.25C + 23C ambient = 52.25C.…
tgun926
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Mains triac safety circuit design

I am investigating using a triac instead of a relay to control 250V 10A devices. However all the 600V 16A triacs come in TO-220 packages. According to AS/NZS 3100 and AS/NZS 60335.1 I need at least 2mm creepage isolation between 250v circuits, but…
ljbade
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Is it normal to have 3.3 V in the heat pad of a LD1117V33C linear regulator (TO-220)?

I assembled my first PCB and started measuring everything to validate that it is correct. When it was the turn of the a TO-220 linear regulator (LD1117V33C) I got surprised to see 3.3 V in the heat pad. Is this normal? If yes... Why is that? When is…
Carlos Garcia
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Is there a good reason why TO-220 5-lead components have bent leads?

I've recently acquired some LM2596T-5.0 3A buck converters. They are TO-220-5L packages with bent leads similar to this image: I have seen other TO-220-5L components with straight leads like this: My question is whether there is a good reason why…
ThatAintWorking
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TO-220 rectangular washers

The recommended way to mount a TO-220 package is to use a spring clip or bar pressing on the body of device. But the package was designed to be mounted using a bolt through the hole in the heatsink, and the manufacturers provide mounting…
david
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TO-220 case-to-sink thermal resistance

I'm using a KSC1173 TO-220 power transistor in a design, and I need to calculate the case temperature for the maximum average power dissipation, to see if the power dissipation falls under the temperature derating curve in the datasheet for a…
MattyZ
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Why do they place a high current device in a low current package?

For instance, it is said that the practical current limit of the TO-220 device is 75A. But I frequently see MOSFET devices for which the specified maximum continuous drain current is above 75A. (Examples) Is there any practical difference between…
hkBattousai
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What IC is this TO-220?

This IC, 5TB06-700BW, is sitting on a motor controller PCB (manufactured in 1998). Pin 1 and 2 are attached to 230V lines, while pin 3 is attached to the output-pin on a U2010B phase control IC. The motor does not run so I suspect that the TO-220 IC…
bos
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What are the pins of a MOSFET in a TO220 package?

I have an IRF3205 MOSFET in a TO-220 package, and I would like to know where the drain, gate and source are. I can't find this information.
Mildred
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Voltage Regulator Heat Concerns

I've read some very good threads here on power and heat dissipation in VRs and believe I understand (most of) it. I have a 5V circuit operating a 12V relay (nominal operating current of 53mA), an ATtiny85, a couple BJTs, and a few passive…
unix
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