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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votes
2answers
3k views

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 ...
8
votes
2answers
5k views

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. ...
6
votes
5answers
2k views

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, ...
6
votes
3answers
2k views

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 ...
5
votes
1answer
10k views

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 ...
5
votes
1answer
739 views

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: ...
5
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2answers
313 views

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, ...
4
votes
3answers
692 views

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. (...
4
votes
3answers
12k views

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 ...
4
votes
3answers
2k views

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 ...
3
votes
1answer
93 views

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 ...
2
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2answers
17k views

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.
2
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1answer
395 views

Swap FET TO-220 pinout

I messed up my PCB design when I made a change of FET-model. Now the Drain and the Source pins are swapped and it seems that there are no TO-220 models made this way (1-Gate, 2-Source, 3-Drain). Are ...
1
vote
1answer
149 views

Where can I find the C/W rating for PI48, PI49 and PI51 heat sinks?

I was wondering if there is any reference to calculate the C/W ratings for PI48, PI49 and PI51 heat sinks? Just for reference, I am referring to these devices: http://www.nex-robotics.com/heat-sink....
1
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1answer
549 views

Eagle model for TO-220F-4L

Where can I find an Eagle model for the TO-220F-4L package? Or something similar? I'm trying to add a KA78RXXC-Series Voltage Regulator and I can't even find another component with the same pins.
1
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1answer
52 views

Electrical insulation resistance of TO-220 package with SIL pad and plastic shoulder washer?

What would a ballpark insulation voltage (HI-POT) rating be for a TO-220 package (with a "hot" tab) mounted to a grounded heat-sink with SIL pad and shoulder washer? I am not seeing much ...
0
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2answers
515 views

Can the metal tab at top of a TO-220 package be cut off?

I am using a TIP120 Darlington transistor in a through-hole (specifically TO-220) package, in a very simple application which does not generate much heat. I remember reading that the metal tab at the ...
0
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3answers
83 views

How to remove solder mask in Eagle

I want to remove solder mask in particular area for mount a TO220 package. As shown in below image I want to mount the 7805 using a M3 nut and need to remove solder mask only in covering area. (like ...
0
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1answer
258 views

Unsolder large TO-220 or TO-247 packages

I'm aware this question may be construed as asking for advice but I'm going to venture to ask anyways. Does anyone have a good method for removing larger TO‑220 or TO‑247 packages? I ...
0
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1answer
108 views

110V Light in 220V fixture? [closed]

Last year I ordered this lamp, which I received a few weeks later in a rather shadily packaged box sent directly from China. The box had 110V written all over it. I still like the lamp, but we are ...
0
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2answers
87 views

Intermittent power dissipation calculation on TO-220 package

For a certain application I will be using this resistor. I might also go for this other resistor if needed. The working conditions are: Ambient temperature (max): 70 ºC Power to be dissipated: 15 W "...
0
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1answer
918 views

Desoldering a TO-220 MOSFET from a plated through-hole board with SMD complications

I'm planning on replacing a TO-220F package MOSFET on a through-hole circuit board that also has SMD components on it. In this case, an SMD capacitor is connected to the source gate of the MOSFET by ...