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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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 ...
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10 votes
2 answers
2k views

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 ...
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2 answers
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Where can I get a 3D CAD model of the lead frame of TO220-2L?

I am new to electronics packaging and searching for a 3D CAD model of TO220 with 2 leads. I have tried at numerous websites without any luck. If anyone has a 3D CAD model of this lead frame or can ...
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2 answers
566 views

4940v5 drop-in replacement for LM7805?

I am a novice who purchased several TO-220 L4940v5 chips thinking they were drop-in replacements for the inefficient TO-220 7805s that I've been using. But not a single one seems to work. No heat, ...
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1 answer
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What is the orientation of the pins in this drawing of an L4940V5 TO-220?

I am a novice trying to build a circuit using a L4904v5 voltage regulator. The datasheet has the following images: This 2D pinout drawing gives me few clues about which side I am viewing it from. I ...
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3 answers
2k 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 ...
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1 vote
1 answer
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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 ...
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2 answers
189 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 "...
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1 answer
196 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 ...
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2 votes
1 answer
645 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 ...
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1 answer
383 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 ...
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3 votes
1 answer
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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 ...
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1 answer
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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 ...
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5 votes
1 answer
1k 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: ...
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1 vote
1 answer
193 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....
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1 answer
694 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.
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2 answers
440 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, ...
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2 answers
801 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 ...
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6 votes
5 answers
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, ...
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8 votes
1 answer
15k 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 ...
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4 votes
3 answers
717 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. (...
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10 votes
2 answers
4k 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 ...
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6 votes
3 answers
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 ...
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5 votes
3 answers
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 ...
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3 votes
2 answers
20k 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.
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4 votes
3 answers
15k 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 ...
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9 votes
2 answers
6k 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. ...
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