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 Mar 21, 2008 |
... reply and try to assist. PROMATION, my company, also manufactures Diode Laser soldering systems but with this stated we also manufacturer iron tip systems, soft beam systems and hot air solutions. The reasons are simple. Diode Laser is not for everyone or every application. Our engineering team has yet to find any thermal sensor or other solution that can provide accurate feedback on soldering temperature when using a diode laser which is unlike that of an Iron tip solution where the temperature ...
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Jun 10, 2006 |
SM4007A Genpurpose Diode Chuckie: SM4007A Diode case is D0-214AC G. Eisner: On tombstoning: * Check reflow profile * Pads per IPC-SM-782 * Reduce amount of solder paste * Check component solderability * Place component accurately * Search the fine SMTnet Archives for background discussions
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May 23, 2005 |
CRD (T,CR,D,L,C+,Q) this is usually the case however you may want to contact design shop to verify and get there coding schemes. T= Transformer CR= Diode D = Diode L = Inductor C+ = Tantalum cap? C = Cap Q = transistor
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Jun 9, 2006 |
SM4007A Genpurpose Diode We are finding this diode not reflowing well. We are having tombstoning issues with this part and only this part on different pcbs. The main thing we find is that under a scope there is blow outs as in air bubbles that look like they have exploded. I am thinking there is contamination on the Components. We had just profiled our oven for the board we were using. My main reason for this thought is that on one of the pcbs we ran thru the processes we had a perfect print on ...
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Jul 17, 2007 |
Please help me identify this diode It's a small diode with orange core - has a blue kathode stripe it reads "3" then as you roll it over it reads "2c" That is it. I really would appreciate any help in identifying this diode and understanding the coding method used on these diodes. Thank you ...
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Mar 29, 2006 |
SMT diode We have been experiencing a reflow issue with a SMT diode 4007. This is a SMA or DO 214-A package. It is a lead free part used with 63/37 paste no clean flux. The problem is it is not consistant. 100 diodes can be reflowed rock solid on the board and then one or two can be flicked off with with your finger with little effort. The solder joint on these looks a little grainy, like a cold solder joint. Peak temp is about 225 C on this diode and about 70 seconds in liquidus. Trying to ...
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Feb 28, 2000 |
S-MINI 2 Pin Diode Can anyone direct me to a proper footprint for an s-mini 2 pin diode. I can not find one in the manufactureres data sheet and this part is not in the IPC book. Anyone know where I can find it ...
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Feb 28, 2000 |
S-MINI 2 Pin Diode Can anyone direct me to a proper footprint for an s-mini 2 pin diode. I can not find one in the manufactureres data sheet and this part is not in the IPC book. Anyone know where I can find it ...
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Oct 27, 2003 |
Wiring LED's A light emitting diode or "LED" doesn't care about voltage, it will light with approx. 10 to 20 milliamps of current. In a 12V system (such as an auto), a resistor of 1K ohms is ideal. At 12V, this allows about 12 mA of current, at 13.8V (approximate alternator output), the current would be about 14 mA. Yes it is a diode, so has to be forward biased to light. The current limiting resistor can go on the cathode or anode, it'll do it's job either way. SP1
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Apr 17, 2001 |
... slides on one of the pads (as much as 0.125"). There is a slight amount of warp in the PCB during reflow. Every array is inspected via AOI before entering the oven. In a related note... there is a small diode placed near the antenna that disappears during reflow. I assumed that the diode (SOT-23 style leads) did not have enough surface contact with the solder paste to withstand the force of the convection blowers. With that in mind I have tried reducing the fan speeds on the oven to reduce the ...
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Jan 5, 1999 |
... a B. Letter The second letter indicates the device application:A: Diode RF N: OptocouplerB: Variac P: Radiation sensitive deviceC: transistor, AF, small signal Q: Radiation producing deviceD: transistor, AF, power R: Thyristor, Low powerE: Tunnel diode T Thyristor, PowerF: transistor, HF, small signal U: Transistor, power, switchingK: Hall effect device Y: RectifierL: Transistor, HF, power Z: Zener, or voltage regulator diode [Letter] [Optional third letter] indicates that the device is intended ...
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Nov 28, 2001 |
... with gluing & putting them through the wave on some of our older legacy designs. Increasing the amount of glue will help a little bit. We ended up talking to both the diode vendor & our glue vendor to get a solution. We wound up dispensing a little more glue under the melf to ensure good coverage between PCB & part. The diode vendor then gave us a corrective action plan for ensuring we would receive diodes that were compatable with the gluing process. All they really did was change the type of ...
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Jan 26, 2000 |
Re: BAS32 diode broken The diode doesn�t appear completely broken. It takes a bit white color (cristal break, I think), instead of the normal red/orange. It works like a 20K-200K ohm resistor. !The diode can be working properly and sometimes change to bad! I think it may be a problem of board flex. Is it normal? I have seen it in SMD capacitors (KEMET flex crack files) in our products. Thank you very much
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Jan 26, 2000 |
Re: BAS32 diode broken I recommend you to test at least 2 other vendors for the diode; you can find that the problem is diode manufacturing, or else, you will find out that you have a proccess problem for sure. There is no use to start investigating your proccess before you are sure the problem is there ! Roni
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Jun 13, 2006 |
SM4007A Genpurpose Diode Ummm.....OK? Do you guys get in trouble for the loud noise your high fives make? No, seriously, that's gotta be one giant noise followed by some hooting and hollering. I'll even go out on a limb and say you guys call each other "Da Man!" real loud too. If you dance, who leads ...
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Jun 13, 2006 |
SM4007A Genpurpose Diode davef burns you agin! Haha! We know more than you ...
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Jun 11, 2006 |
SM4007A Genpurpose Diode "Chunkie" - Ha ha again Chunks! Davef burns you again you dumb SOB ...
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Jun 10, 2006 |
SM4007A Genpurpose Diode i have pictures available now so if you want send me an email at geisner@pacificinsight.com Thanks
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Jun 9, 2006 |
SM4007A Genpurpose Diode Pads may be too far apart from each other
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Jun 9, 2006 |
SM4007A Genpurpose Diode No it is a SMA package not Melf. thanks
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Jun 9, 2006 |
SM4007A Genpurpose Diode I believe this is a MELF, correct? If so, it could be your pad design. Most use a "horse shoe" style that seems to work well. Another thing to look at is your cooling zones. I've seen these parts remain liquidous into the cooling zone where they tombstoned as well. Of course, just as you have said, I too have seen bad plating on the ends of the part too ...
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Nov 26, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment Dmitry--Good afternoon. We are dealers in used and reconditioned assembly equipment, and can provide the radial insertion machines required for this application. Regards, Nick Haviland, Electronic Assembly Machinery Exchange, (WI & IL, USA) (262) 249-0808 ...
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Nov 24, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment Hi, there is also a German company making odd-shaped component insertion equipment, actually very very suitable for LED placement and soldering in the same process cycle. LED's are held in position until soldering is complete, straight and in the same height. Make for a good display. Unit is called Place-and-Solder. Check out either website: http://www ...
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Nov 21, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment Panasonic is another supplier of automatic radial lead insertion machines. Go to: http://www.panasonicfa.com/cgi-bin/product.cgi?prodline=electronics%20assembly&category=Pin%20Through-Hole&prodid=rh5 www.panasonicfa.com
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Nov 12, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment Depending on quantities etc, you probably have a few options. If it's the automated route you require then any of the radial insertion machines from UIC or TDK will do the job. We've inserted LED's in the past with machines over 10 years old, so if cost is an issue, and ultra high speed isn't, then an old refurbished machine will do the job. Check out these sites for an idea. LED (Ligth Emitting Diode) auto insertion equipment
Nov 11, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment Use a Radial lead inserter. you will need 1 head for each different part number you have. the machine cannsert 2.5 $ 5.o mm lead components and 7.5 with special to0ling. For LED you want to use a Radial with the new dual spocket CTA (Component transfer assembly)Rad-V or better ...
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Nov 11, 2003 |
LED (Ligth Emitting Diode) auto insertion equipment What kind of equipment is used to insert LEDs into PCB? LEDs are in tape form. Thank you for your help ...
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Nov 1, 2002 |
SMT Terms like this.... D13 Diode, Rctfr, SK12 1A, 20V Schottky "SMB" or F1 Pollyswitch, SMD300, 60V, 3A @20 celcius, "SMD ...
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Mar 9, 2010 |
Pin hole We have encountered high percentage of pin holes issue after lead-free reflow soldering from particular diode supplier that manufactured at Morocco. However, very little reject being found if the particular component is manufactured at China by using the identical process, machines and chemicals. We did highlighted to the particular supplier but they did not admitted that any changes/differences from these two plants. Please advise if any comments/recommendations for us to pursue these ...
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Mar 18, 2009 |
... MX100 PLC's blown. 2. Both color monitors blown. 3. Y-axis servo amp blown 4. MOV (metal oxide varistor) on noise filter blown. I got very lucky on this and was able to repair without buying parts. Both Plc's had a blown thermistor and 2 blown diode's. I replaced the bad components and PLC's are now working. MOV's were easy to replace. I really got lucky on the Y amp. I took it apart and found a bad resistor where the incoming AC gets distributed. Replaced the resistor and now the amp is good. I ...
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Oct 16, 2008 |
... Especially if her review depends on it:) What other components are you having trouble with other than diodes? The diodes we purchase are usually in a SOT-23 package but the marking is always clearly visible. Now it may depend on what package the diode is in. Is it different packages and different parts? Some parts we have trouble with. TVS in a 2010 package, to name one, have the markings printed, not laser etched. This makes it extremely difficult to get any repeatability or consistancy during ...
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Dec 28, 2007 |
... That�s a killer. Especially if it�s salesperson driven (which most are). Almost as bad as when they pick up Circuits Assembly or Assembly Magazine. OK so you�re stuck doing this process. I would invest in the trained monkey with the $0.35 diode. There are a few good machines out there to do solder paste inspection, but if you�re going to spend the money, why not look at solder joints after the oven? There are several machines that will look at component ID as well as solder joint quality ...
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Dec 28, 2007 |
... worlds problems. She then inquired as to why we were not measuring everything as we already had the equipment. Anyways, that's an uphill battle. So, our current system is down (burnt the laser out) It will cost over 1K for the part ($.35 laser diode) that can only be replaced by a trained monkey at a premium rate. At this point I am not inclined to repair this system. As I had mentioned, I have seen some systems that do coverage as well as height. I was wondering if anyone had any input as to ...
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Nov 23, 2007 |
Laser solder reflection I may be able to help but would need to understasnd more about your application. The rating on the diode laser can directly effect its ability to refelct or penetrate the solder, but I would lnot to rule out beam placement at the joint either. If you system is hard tooled (no vision) you may see variance in where the beam hits the pad, pin, etc which could also be causing this issue. Please write me at Please help me identify this diode
Jul 18, 2007 |
Please help me identify this diode Look here: * http://www.tpub.com/neets/book7/24k.htm * http://www.engplanet.com/redirect.html?3809 Search the fine SMTnet Archives for other links to component identification sites
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Jul 11, 2007 |
... and thereby it utilizes the "Force Sensor" located inside the Midas head. The "Force Sensor" is a set of bulbous diodes, of which one transmits and the other receives (senses) light. The base end of the spring tool will block the light from one diode to the next when placing a part, therefore it needs to be cleaned regularly as part of your daily or weekly maintenance. If the glass bulb part is dirty which occurs due to the air transferred across the tops of the bulbs from the vacuum being drawn ...
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Jan 9, 2007 |
... is more than once I've been told the only difference in a new rev is one component or one change. But the truth was that was the only reason for the change, and in fact there were several changes made because of the primary change. For example a diode was changed to a much smaller package, and the kit was issued with the old rev parts but caps and resistors had changed to match the new diodes. Make sure that the shielding was the only change. Also can you hand solder the shielding on later? If ...
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Oct 20, 2006 |
Unknown Schematic Drawing If it looks like 2 zener symbols tyed together at their cathodes I belive this is a avalanche diode or transient voltage suppressor (TVS). If you have a p/n you could do a search on like digikeys wesite and possible get an idea ...
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Oct 12, 2006 |
Unknown Schematic Drawing I looked at this site, and again no drawing that has the junction line. This line is the same as a zener line. The closest one is a GUNN diode. any suggestions ...
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Oct 10, 2006 |
Unknown Schematic Drawing Photo sensitive diode? See here: http://library.thinkquest.org/10784/circuit_symbols.html
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Jun 13, 2006 |
Assembl�on feeders Has anybody else noticed a problem with Assembl�on's mechanical 12 mm feeders, with 4 mm pitch? We are experiencing grave pickup problems with a MELF diode packed this way and fed with this type of feeder. If I attach a hefty weight to the blister tape in order to create additional pull to the blister tape the feeder seems to work much better. Not exactly a high tech solution but does help to some extent. Quite obviously the spring-operated tape feed mechanism simply does ...
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Apr 19, 2006 |
... different, it might take a while for you to fine-tune the program every time, could you afford this? also depending on your assemblies, you need to consider the wattage required, 30, 60w, etc. About running costs....Do you know how long the laser diode lasts? After a number of hours-use it starts to degrade and eventually you will have to replace it. This is something that laser selective equipment vendors do not mention if you do not ask. This is my 2-cents and my opinion...Good luck on you ...
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Apr 11, 2006 |
LASER SOLDERING Hi Dougs I worked a bit a few years ago with a diode type soldering laser. I found laser soldering very application specific so make sure you send samples off to differnt companies to see actual results. You can get good results with a laser system, just takes some work. Pros: Isolated heat area, quick to respond, target solder joint, flexible (if good software and laser control), repeatable Cons: The quick ramp rate can cause solder balling (flux burn off and scatter solder, ie ...
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Mar 29, 2006 |
SMT diode Send me the pix. Is the solder attached well to the pad on the board ...
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Feb 6, 2006 |
Identifying SMT sot23 diodes ? Is it possible to identify the part# of an SMT diode by the markings on the top of the part. The part(s) are in an SOT23 package. I have 2 parts. The markings are: KZ2 P3 and KJE ON Thanks
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Jul 12, 2004 |
pcb laser markers For laser marking you don�t require as powerful lasers then for cutting. A 20 Watt laser diode does already a good job. Because of the safety requirements the laser operates in an enclosure, which means more $$$ if you want to use the laser in line with conveyor. Check out, if the software does that, what you like to do. The laser marker may read a print file and may operate like a printer. Instead of an ink dot, it turns the laser on, line by line. It may take quite a while ...
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May 22, 2004 |
Laser Soldering? Contact Panasonic Factory Automation at 714 373 7030. They manufacture laser diode soldering systems
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Sep 22, 2003 |
Colorless LEDs - Mix up You can use a meter in "diode mode" to illuminate an LED to check a batch. Hopefully your stock room doesn't open the container and poor them all into a bucket to be issued out to the floor ...
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Nov 4, 2002 |
MELFs Before I waste a lot of time and parts..... Will the Fuji CP3 place a melf diode without a special nozzle? If so, what size would you reccomend for best accuracy ...
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Sep 18, 2002 |
... has the board. Machine A then turns off it's opto or opens its relay to tell machine B that it no longer has a board to give to machine B. Here is my problem: The opto has a diode across it to protect it and if machine A's wires are mixed up, machine A "board available from previous" signal will be at the anode of the diode which will always conduct and will pass the signal back to machine A where it will be pulled low. The result of this is the conveyor (machine A) will try and feed a board to ...
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