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7 votes
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Hot air. Too hot or too slow?

I'm not saying it can't be done without, but I would really recommend a board pre-heater. These devices apply lower, non-soldering heat to the whole board to make it easier to reflow the solder. If ...
LordTeddy's user avatar
  • 2,372
6 votes
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Is this chip 0.5mm pin pitch?

I've googled for "altera 144-EQFP" and turned up this PDF. Searched within that document for EQFP and found on page 69 the heading "144-Pin Plastic Enhanced Quad Flat Pack (EQFP)—Wire Bond" with a ...
vicatcu's user avatar
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4 votes
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Is hot air only meant for desoldering?

It's not really a misuse to use a hot air hand rework station for soldering parts, but it would be uneconomical to solder whole boards with it in a production setting. Getting consistent, high-yield ...
pericynthion's user avatar
  • 6,184
3 votes

Recommendations on the use of a hot air solder station with heating plate

This depends on many things. It depends on if there are components on the back side of the board. If so, they could fall off from too much bed heat. And it depends on what sensitive components are ...
rdtsc's user avatar
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3 votes
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LGA parts and hot air soldering

First of all, if you are using lead-free solder, it sucks, if possible use leaded solder. There are two categories of soldering. With interaction and without. Interaction refers to the necessity of ...
vini_i's user avatar
  • 7,127
2 votes

Is it safe to use hot air on SMD LEDs?

I've had mixed results and its reasons like these that I finally built a reflow oven. My experience has been that if I use the hot air at 250 deg celsius more than about 30 seconds the clear lens ...
user3418620's user avatar
  • 1,340
2 votes

Is it safe to use hot air on SMD LEDs?

There's no way to be sure about potential damage without knowing the part number of your LED, which is needed to obtain its datasheet. The datasheet will outline the temperature specs of the LED (...
Ed Sawden's user avatar
2 votes

How do i solder qfn package using soldering iron?

I normally put some solder paste on the pads, place the QFN on the board, and reflow with hot air. With some trial and error you learn how much solder paste to put, but you really need quite little. ...
Elmesito's user avatar
  • 2,767
2 votes

Safe temperature for desoldering SMD components w/ hot-air rework gun?

preheat your pcb to 150c. Use Chipquick alloy or Zephertronics Lo melt. Apply flux, lomelt let sit for about 4 mins then lift the chip off the pcb. Use flux and a swab to gather and remove the ...
paul's user avatar
  • 21
2 votes
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band / cylinder style heating element wattage calculations

Start by calculating the power required just to heat the air. Power is energy per time. A useful unit of power is Watts, which is one Joule per second. Let's therefore figure out how many Joules it ...
Olin Lathrop's user avatar
2 votes

Soldering USB sockets and GSM module with hot air

As the others have commented, you really would want to use an oven. A hot air tool cannot give the volume of heat required to bring everything up to the right temperature. Note that your mobile module ...
Kartman's user avatar
  • 6,388
1 vote

How are surface-mount parts held in place for hot air soldering?

These two inductor look quite large compared to small resistors like a 0603 or 0402 and those resistors don't get "blown away" by the hot air rework station unless the air setting is too ...
Rodo's user avatar
  • 1,120
1 vote

How are surface-mount parts held in place for hot air soldering?

The problem is that the part tends to get blown around by the airflow unless held in place, and it's quite difficult to hold the part in place while also moving the hot air gun around all sides of it. ...
Voltage Spike's user avatar
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1 vote

How are surface-mount parts held in place for hot air soldering?

Building off of Andy's comment, I would think that some type of silicone adhesive or flexible epoxy would work well. Maybe even look at flexible liquid engine gasket? It's made for automotive use, but ...
mech-eng_doing_ee's user avatar
1 vote

Recommendations on the use of a hot air solder station with heating plate

The answer to almost all your questions is "it depends." Factors like board size, layer count, component type, solder type, and what type of rework or fabrication you are performing all will ...
JYelton's user avatar
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1 vote

How to prevent repeated re-soldering of SMD chip during testing?

Suggesting that re-designing the device to fit some socket in it isn't an option for you: You can place a solder jumper (or 0402 0 Ohm) on each trace, which will be manually soldered after "in-...
Looongcat's user avatar
  • 600
1 vote

Soldering USB sockets and GSM module with hot air

Page 5 of the USB Socket, Fig 2 Recommended reflow temp profile: 150'C - 90sec - ramp to 250'C. Page 73 of BG96 soldering instruction says It is suggested that the peak reflow temperature is 235~...
jay's user avatar
  • 3,851
1 vote

Is hot air only meant for desoldering?

A rework station is different than a "hot air gun" or "heat gun," which are similar but don't have precise temperature controls. A rework or reflow gun/station can be used in any application where ...
Jarrod Christman's user avatar
1 vote

What can be soldered with a hot air rework station?

What could I expect to solder consistently using hot air that's not "possible" with solder iron? Anything with pads below the component. Thermal pads, QFN, BGA etc. Though mostly hot air ...
Lundin's user avatar
  • 20.9k
1 vote

Need some tips on using hot air soldering station for my project

You've designed a board with very small components that will be very hard to hand solder and then decided that you must use hand soldering. This is a bad idea, when you design a board you should lay ...
user1850479's user avatar
  • 17.4k
1 vote

Desoldering with cheap Hot Air Rework Station

The time to remove a part depends on the thermal mass of the board it is connected to and the power (temperature and flow rate) of the hot air. If you have a chip connected to a big ground plane, it ...
user1850479's user avatar
  • 17.4k
1 vote
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How to reflow a part in an infared IR rework station?

My procedure when I've occasionally done this in the past with QFNs & TQFPs is: - gently but thoroughly clean the pads. - apply fresh paste - place the new part with the help of a vacuum ...
brhans's user avatar
  • 14.7k
1 vote
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Small 'blistering' under surface-mount soldering attempt - is this a problem?

The photo is a bit too unfocused for me to say for sure, but it almost looks like there was an inclusion under the mask when the board was manufactured. I looks like a bit of air/dust/liquid in there "...
Robherc KV5ROB's user avatar
1 vote

Small 'blistering' under surface-mount soldering attempt - is this a problem?

I'm sorry, but I can't see what you're referring to in the images. But, if I'm understanding correctly, the "bubbling" is visible on the bottom side underneath the reworked IC "U3"? If so, I expect ...
bitsmack's user avatar
  • 17k
1 vote

Hot air rework temperature to avoid solder melt on opposite end

Got into a debate today with an apprentice electronics hobbyist over heat while soldering. He already had his mind made up and threw out some numbers for iron temps. Where he got them evades me since ...
N9ZN's user avatar
  • 271
1 vote

Hot air rework temperature to avoid solder melt on opposite end

I know this answer is a bit late ;>) but hopefully it will help others who search for something similar... The goal when manually reworking circuit boards is to apply the right amount of heat. If ...
Minho's user avatar
  • 361
1 vote

What is a good lab surface to hot-air rework on?

you can use silicon rubber mats what you use for baking to protect you workbench surface quite cheap to buy from most home stores
john's user avatar
  • 19
1 vote

Hot Air Gun for Reflowing a Board?

I have used a "hardware store"-grade heat gun for smt reflow dozens of times as of now. It works really well, no problems so far. Here are a few crucial hints as to how this is done ...
VaTTeRGeR's user avatar
  • 111

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