SMT Soldering Techniques,SMT Soldering Kit, SMT soldering Process, USA. China

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SMT Soldering Techniques,SMT Soldering Kit, SMT soldering Process, USA. China

Making a fine tip for your solding iron for SMD soldering by MrZebra
Download See AllJump To2 Steps

Surface-mount soldering can require a very fine tip for your soldering iron. If you only have a small amount of soldering to do, then why spend the time and money buying a tip when you can make one?

I came up with this after reading Soldering Surface Mount Technology Components (SMT)

The Electric Skillet Method

Here is my method for soldering surface mount boards. Results have been very good from the first time it was tried. No burned parts or PCBs, no unsoldered joints.

I use Kester type R276 paste purchased from Digikey. This comes in a fairly large syringe which holds 35 grams of paste. Unfortunately, Digikey does not sell the applicator tips (like a hypodermic needle with a blunt tip). One of our technicians at work gave me a couple of his. He gets his paste and tips from Contact East.

Hand Soldering SMT

This is an overview page on hand-soldering surface-mount components. It is part of our Surface-mount soldering may be easier than you think! series.

Hand soldering uses an iron, solder, soldering wick, and sometimes flux to attach surface mount components to a circuit board.2 IN 1 SMD HOT AIR REWORK SOLDERING IRON STATION 852D+
it is 852D++ with quality long life heating elements

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Equipment for hand SMD soldering
by robodude666 » Sun Nov 14, 2010 12:10 pm

Hey guys,

I'm venturing into the world of hand SMD soldering very soon. It's something I've always wanted to do, and it seems like a very useful skill to have combined with the ability to etch your own boards!BDMICRO SMT SOLDERING TUTORIAL

Are you worried about not being able to solder the surface mount components onto the MAVRIC-IB and MAVRIC-IIB board(s)? If so, please read the following quick tutorial. I was worried about it too, but with a few simple techniques and the right tools, anyone can do it.

Soldering the ATmega128 TQFP and other pinned SMD packages

Soldering 0603 Sized Resistors and Capacitors

Notes for Success

Soldering the ATmega128
The following video demonstrates the technique. Click on the image below to view the video (4.3 MB).
e who want to hand solder surface mount (SMT) components. Are you an engineer, technician, educator, student or DIY hobbyist who has avoided utilizing SMT components? Those days are officially over, because with SchmartBoard practically anyone can hand solder SOIC, QFP, PLCC, QFN, BGA and discrete surface mount components.
SMD Soldering Guide by Infidigm


The purpose of this guide is to introduce SMD (Surface Mount Device) hand soldering. The guide is organized into different methods. Each method is used specifically for a group of SMD components. A simplified list is included with each method to identify which types of SMD components are for the appropriate method.

Please visit Introduction to soldering in general, if you have never soldered before.

SMD Hand Soldering Methods Surface-mount technology
From Wikipedia, the free encyclopedia

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For Production-Quality Solder Joints Complete with Fillets at the Bench!

Here’s How Simple High-Quality SMD Soldering Can Be...

Step 1.

Always Make Sure PCB Assy is Level and Secure. Place your PCB Assembly into the ABC-1 Adjustable Board Cradle and above the ZT-1 AIRBATH as shown at the left.

Step 2.

Apply Bead of Solder Paste. With the appropriate gage of paste application tip (See Selection Chart Below), apply a continuous bead of solder paste down the middle of the pads (Recommended: Zephpaste SPE-0012) as shown here.

Step 3.SMT Soldering

- overview or tutorial about SMT soldering, the SMD solder process for surface mount components.

Solder and soldering techniques technology includes:
• Solder
• Soldering basics tutorial
• Solder paste and how to use it
• Lead free soldering
• Solder resist
• Soldering irons and stations
• SMT soldering techniques
• Infrared reflow soldering
• Wave soldering
• BGA solder process
With the rise in the level of SMT or surface mount technology used in electronics to the extent that traditional leaded components are rarely used for mass produced electronics equipment, there has been a similar move forward on soldering techniques for SMT.
Although in the very first days of using surface mount technology, SMT, soldering was sometimes achieved manually, this is not feasible in the vast majority of cases today for two reasons:
The minute size of the components and tracks is too small for manual operations and traditional soldering.
The quantities of circuits normally produced could not be achieved using manual methods.
SMT soldering process
There are several stages required to solder SMDs to boards. However there are two basic methods of soldering that are used. These two processes require the board to be laid out with slightly different PCB design rules, and they also require the SMT soldering process to be different. The two main methods for SMT soldering are:

Pick and Place Chip. Using an ESD safe, and soft vacuum lifting device such as the ZT-3-MIL AIRPICK, lift and gently place the selected SMD on top of the bead of paste above the corresponding pads.

Step 4.
Adjust Alignment if Needed. After placing SMD, check so all leads and pads are aligned. "Fine tune" with a stainless steel SMD or Dental Probe as shown. Recommended (SMT Probes SDP-1111).

Surface-mount components on a USB flash drive's circuit board. The small rectangular chips with numbers are resistors, while the unmarked small rectangular chips are capacitors. The visible capacitors and resistors are predominantly a combination of 0805 and 0603 package sizes, while the smallest chip capacitors are 01005 size

Surface-mount capacitor
Surface-mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a surface-mount device (SMD). In the industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board. Both technologies can be used on the same board for components not suited to surface mounting such as transformers and heat-sinked power semiconductors.
An SMT component is usually smaller than its through-hole counterpart because it has either smaller leads or no leads at all. It may have short pins or leads of various styles, flat contacts, a matrix of solder balls (BGAs), or terminations on the body of the component.

Method 1 - Pin by pin Used for : two pin components (0805 caps & res), pitches >= 0.0315" in Small Outline Package, (T)QFP and SOT (Mini 3P).
Method 2 - Flood and suck Used for : pitches <= 0.0315" in Small Outline Package and (T)QFP
Method 3 - Solder paste Used for BGA, MLF / MLA packages; where the pins are underneath the part and inaccessible.
Desoldering SMD Special methods for desoldering without the need for special soldering iron tips.

Surface Mount Soldering with a Toaster Oven
It's a fact of life that surface-mount technology is the way most things are made these days, and even at the hobbyist level it's becoming more important to be able to work with it. At Freetronics we use SMT for just about everything, and we use a variety of techniques depending on what needs to be done. The parts are so damn tiny though that it can take a lot of care to get it right.

If you have a soldering iron with an ultra-fine tip, a magnifying headset or microscope, and very steady hands, it's quite possible to solder every joint individually by hand. That's the way Marc prefers to work.

You can also do a "poor-man" version of the infra-red oven technique commonly used by professional assembly houses, resulting in very neat joints and parts that should all be correctly aligned. It's not particularly hard but you do need to follow a specific sequence, so I'll explain the steps that I (Jon) normally use when assembling SMT parts.
Method 1 - Pin by pin

Used for :
Diodes, Capacitors and Resistors in sizes like 0603, 0805, 1206, 1210, 1812, 1825, 3216, 3528, 6032, and 7343.
Small Outline Packages and QFP with pitches >= 0.0315". Like SO.050" and SO.80mm (0.0315")
SOT packages like SOT223, SOT23, SOT143, SOT89, Mini-5P, and Mini-6P.
0805 Capacitor example :

Forget all of those difficult hand soldering techniques and special surface mount soldering tools. With SchmartBoard hand soldering surface mount components is even easier than hand soldering through hole. Instead of denying yourself the most current chip technology or paying a fortune for prototyping, you can now use today’s most advance chip technologies in your circuits. SchmartBoard|ez makes hand soldering SMT parts fast, easy and flawless.
t of all you need an soldering iron. It does not have to be fancy or expensive or professional or anything like that. Your soldering iron should just fulfill some requirements:

It must be regulated. If not it will overheat or have some random temperature – but not the one you need. It does not need to have a adjustable temperature (though it helps).
It should have a suitable tip. For SMT you do not need a very fine tip (they do not heat very well), but it should not be too wide. For SMT I like them pencil shaped, a flat one, shaped like a screw driver is fine too. As you can see by comparing this to an AA battery – it is not very thin. If it is similar to the size of the 0805 pads it is fine. For smaller chip packages I really like to use bigger screw driver type tips – they make it easy to apply solder to several pins.

The basic technique for soldering the ATmega128 TQFP package as well as SOIC and other SMD chips is as follows:

Use small diameter solder - 0.015 inch diameter works well most SMD parts. The solder I use is Digikey part #KE1303-ND.

Next, make sure that your soldering iron is hot enough. If the iron is not hot enough, you will have trouble.

While not absolutely required, a good temperature controlled iron can make the process easier. You don't have to pay a lot of money for one, the one in the photo here was found on e-bay for a good price. Expect to pay around $40 to $100 or so new.

Carefully position the ATmega128 over the pads.

With the ATmega128 in position, keep it in position with your finger. Use flux to wet the one or two sides of the TQFP package that you can reach without lifting your other finger. Heat several of the pins on the part to tack it in place. Because of the flux, the existing solder on the PCB pads will wick up on the leads and hold them in place temporarily.

I have a few questions and concerns regarding what I need to get started.

- What solder is best for hand SMD work? I've read Leaded solder is easier to work with; specially, 63/37 is recommended for leaded solder. What gauge is also good to work with? I've read some people saying you need .15mm or .3mm solder, while others say .5mm or .8mm will suffice. Does it make a difference? Is it worth it to spend $30-40 on a huge spool, or are 100g spools okay? Mouser doesn't seem to have many options for solder that are in stock.

- My Aoyue 2900 station is advertised as being a "lead-free" station. Does that mean it's assembly is lead-free, or that it is meant for lead-free work? Would this imply that it will perform poorly if used with leaded solder?

- Does the tip's shape make a huge difference? My Aoyue comes with a conical tip (looks like the stock .5mm LF-2B). I see most SMD tutorials use a tip that comes down to a flathead screwdriver-like shape. Is this required, or simply make life a bit easier? What a beveled tip work just as well as a screwdriver tip, or are those more for drag soldering pins of SMD ICs?

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Temperature-controlled Soldering Iron
A $10 non-temperature controlled iron is not really a good iron to learn SMT soldering on. You don’t need an expensive iron, but you do need to be able to control the temperature.

One of the irons we like here at Wayne and Layne is the Weller WCL100. The knob goes from 0 to 5, instead of being directly temperature-controlled, but we’ve made a lot of good joints with that little guy. It’s relatively inexpensive, at around $50. It comes with an ST3 tip, which may be wider than you’re used to, but actually relatively useful for soldering. Many people may be more comfortable with ST7 or ST8.

For hand soldering SMT, we like to use 0.015″ 60/40 lead solder. Lead-free can be used if you need, and thicker solder may be useful for some techniques.

Solder wick
Click here for larger picture (881 KB)
When I assemble a board, I squirt a very small glob of paste on each of the pads. It takes a little practice to learn how much is the right amount. On ICs, I just run a thin line of cream down the row of pads, rather than trying to do each pin. Using tweezers, I position the part on the pads. The picture above shows a board with the components placed, but, before cooking. If you zoom in, you can see the solder cream around the component pads.

EEVblog #186 – Soldering Tutorial Part 3 – Surface Mount
Posted on July 18th, 2011 EEVblog 36 comments Soldering SMT parts is simple and easy. Its actually quite forgiving, and is very accessible, even for a beginner! You don't even need any fancy tools. Its quite possible to get by with things you already have in your house. There are some tools that make it simpler, but they are not required. The only thing that you absolutely need is a syringe of solder paste, some decent tweezers, and a hotplate. A magnifiying glass can be very helpful, but if you have good eyes, you can easily get by without one.
For more info on what tools you need to do SMT soldering, check out our SMT Toolkit Guide.

Part 3 of the hand soldering tutorial. This time Dave shows you how to drag solder and tack & reflow SMD components, and in particular 0.5mm fine pitch IC’s. Including solder paste and hot air.

Click here for larger picture (859 KB)
Once all the parts are on the pads, I plug in my electric skillet and put the board in the cold skillet. I then turn the skillet temperature control to 200 F. After a couple of minutes, you will see the cream turn a very dull gray and start to spread out over the pads. This step is to warm the board and components slowly, avoiding thermal shock. In the picture below, you can see the solder cream spreading around the pads.