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diode Electronics Forums search results
145 results found for diode in 2s.
Showing matching items 1 - 50
- 89%
SM4007A Genpurpose Diode - 6/9/06 -
- 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 ...
- 89%
Seica Firefly - Issues? - 3/21/08 -
- ... 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 ...
- 89%
Please help me identify this diode - 7/17/07 -
- 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 ...
- 88%
component markings - 10/16/08 -
- ... all purchasing agents do, and that is finding the best deal out there. 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 ...
- 88%
SMT diode - 3/29/06 -
- 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 ...
- 88%
Re: Cylindrical diodes Missing during SMT process. - 8/25/99 -
- Re: Cylindrical diodes Missing during SMT process. | | | | | | Hello everyone, | | | | | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | | | | | | | | | | | Gyver | | | | | | | | | | | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out ...
- 88%
Re: Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Re: Cylindrical diodes Missing during SMT process. | | | | | Hello everyone, | | | | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | | | | | | | | | Gyver | | | | | | | | | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out that the ...
- 87%
double sided boards - process / design issue. - 9/22/98 -
- ... process / design issue. We are getting into a lot of double sided boards offlate. Our customer is loading a lot of RNETS, Diodes ( MINLS, SOT23s and other 2 leaded diodes ). We are processing it through a traditional glue process and wave soldering the SMT parts along with the PTH parts, I am getting a lot of solder shorts on 50 mil devices and skips on the diodes. Have you guys had any problem like this, if so please respond. My customer has a serious real estate problem, he cannot move devices ...
- 87%
Re: Marking Codes - 1/5/99 -
- ... area and flavor of the device accordingto the following code:SA: PNP HF transistor SB: PNP AF transistorSC: NPN HF transistor SD: NPN AF transistorSE: Diode SF: ThyristorsSG: Gunn devices SH: UJTSJ: P-channel FET/MOSFET SK: N-channel FET/MOSFETSM: Triac SQ: LEDSR: Rectifier SS: Signal diodesST: Avalanche diodes SV: VaricapsSZ: Zener diodes Serial number Runs from 10 to 9999 and tells nothing about the transistor except its approximate time of introduction. [suffix] [Optional suffix] indicates ...
- 87%
Re: Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Re: Cylindrical diodes Missing during SMT process. | | | | Hello everyone, | | | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | | | | | | | Gyver | | | | | | | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out that the components were ...
- 87%
Re: Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Re: Cylindrical diodes Missing during SMT process. | | | Hello everyone, | | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | | | | | Gyver | | | | | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out that the components were sticking in ...
- 85%
??what is semiconductor??? - 12/5/07 -
- ... work on the sales of power module, fixing eyes on the market of the industrical line such as transducer??electric welding machine and USP ect.We chronically offer IGBT??IGCT??GTR??IPM??PIM ??SCR?? rectifier bridge?? fast recovery diodes?? soft recovery diodes?? fast Fuse ect with the international well-known brand ,which are producted by America??Japan??German??England??Spain??Switzerland and ect. ??support Mfg?? 1.MITSUBISHI 2.FUJI 3.TOSHIBA 4.SANREX 5.SANKEN 6.HITACHI 7.SEMIKRON 8.SIEMENS ...
- 85%
Re: Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Re: Cylindrical diodes Missing during SMT process. | | Hello everyone, | | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | | | Gyver | | | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out that the components were sticking in the pockets of ...
- 84%
SM4007A Genpurpose Diode - 6/10/06 -
- 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
- 84%
Q) - 5/23/05 -
- 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
- 84%
Re: Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Re: Cylindrical diodes Missing during SMT process. | Hello everyone, | We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. | | Gyver | Are you talking MELF or Mini-MELF diodes here? A while back, we had a spate of Mini-MELF 4148 diodes failing to place. It turned out that the components were sticking in the pockets of the ...
- 84%
Cylindrical diodes Missing during SMT process. - 8/24/99 -
- Cylindrical diodes Missing during SMT process. Hello everyone, We found many cylindrical diodes missing during SMT process. Could someone tell us how to prevent this problem? Is it effective to change the shape of stencil apture or reduce fan speed in reflow oven? Thanks in advance. Gyver
- 83%
This design is for?? - 4/8/07 -
- This design is for?? 1. Resistor is used to provide ground return for diodes. Diodes have a capacitance and with them floating a charge can build up. 2. They each perform different functions. The 100N is used for HF filtering. The 1uf is used for LF filtering and current boosting when needed. Design Tips? You may have to find some books
- 83%
Problem with shielding component - 1/9/07 -
- ... 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 so try a few without it, test them and add them, then test again ...
- 83%
Component Wrong Orientation - 7/23/06 -
- ... but different mfg. part nr). Let say that it is a red led and this itself could be somewhat tricky to order: Red led is as most of the diods, cathod to the left side on the tape, but there are cases that you can order those with the anode to the left! Furthermore, You can also order these whith an anod marking, wich means that you could have a red led diod with the cathode to the left and the the marking to the right. Sometimes the marking is on the left side... This is very specific for the red ...
- 83%
Glass pack Diodes - 5/20/02 -
- Glass pack Diodes What is the recommended prep for a through-hole glass pack diode? Should a stand-off be used or can it lay flat on surface of the pcb ...
- 83%
Evaluating SMD Adhesives - 11/28/01 -
- ... 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 mold release compound they were using to ...
- 83%
BAS32 diode broken - 1/26/00 -
- BAS32 diode broken Has anybody experience (bad) with BAS32 diodes (glass) broken ...
- 83%
S-MINI 2 Pin Diode - 2/28/00 -
- 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 ...
- 83%
S-MINI 2 Pin Diode - 2/28/00 -
- 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 ...
- 82%
Wiring LED's - 10/27/03 -
- 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
- 82%
Reflow of SMT Glue / Adhesives - 6/17/03 -
- ... recommended is more brittle. Look here: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=17906 Q2: Will some of my Ceramic Caps crack during the wave soldering process because of the heat? A2: Probably Q3: Can you see any possible problems that I might encounter during this experiment? A3: Glass diodes sometimes don't adhere to glue well. Glass diodes sometimes crack in the wave ...
- 82%
Polarity for SMT Devices - 5/28/02 -
- ... seen some with elongated solder lands indicating pin 1. Silkscreening boxes around the insides of the solder lands of IC devices to indicate orientation causes problems with low-profile devices whereas the silkscreen deposition is too high and the IC leads are not sitting flat on the solder lands. For caps and diodes, again a silkscreen or etched line is common, on the outside of the solder land. I have seen the solder land shape modified to indicate polarity for caps and diodes, etc....as well ...
- 82%
Cracking Capacitors and Solder Balls - 6/8/98 -
- ... to construct voltage multiplyiers in which a ladder of capacitors and diodes bootstrap the voltage up. They typically are an inch wide and vary in length depending on the voltage desired and therefore the number of capacitors required. The caps are a 2020 package about .13 high. As noted before they are constructed of an NPO type of ceramic. The pads are .075 by .215 and are connected to the through holes for the diodes by very short, .010long, .030 wide traces. An interesting construction ...
- 82%
Re: BAS32 diode broken - 1/26/00 -
- 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
- 82%
Re: BAS32 diode broken - 1/26/00 -
- 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
- 82%
Part sliding in reflow? - 4/17/01 -
- ... 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 ...
- 82%
Identifying SMT sot23 diodes ? - 2/6/06 -
- 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
- 82%
Evaluating SMD Adhesives - 11/28/01 -
- Evaluating SMD Adhesives We?ve also had glass diode difficulties- poor adhesion while all other parts are fine (including tall parts). I?ve received some interesting information from Heraeus: It seems the newer glues create a much stronger bond to SMD?s, except glass diodes. They claim some older, more flexible glues actually perform better on glass retention. We?re currently performing laboratory testing (pull and shear) on modern formulations of Heraeus products, and comparing them to some ...
- 82%
Re: double sided boards - process / design issue. - 9/22/98 -
- ... process / design issue. | We are getting into a lot of double sided boards offlate. Our customer is loading a lot of RNETS, Diodes ( MINLS, SOT23s and other 2 leaded diodes ). We are processing it through a traditional glue process and wave soldering the SMT parts along with the PTH parts, I am getting a lot of solder shorts on 50 mil devices and skips on the diodes. | Have you guys had any problem like this, if so please respond. | My customer has a serious real estate problem, he cannot move ...
- 80%
CS-400D Manuals - 5/15/09 -
- CS-400D Manuals I use a clinch of 5 and a length of 3 for 1/4w and thicker leg diodes probably a 7 and 5. You really just have to play with the machine it figure out what works best for your application ...
- 80%
CS-400D Manuals - 5/13/09 -
- CS-400D Manuals Does anybody have any recommended Clinch/Length values for: 1/4W Resistor 1N4007 Diodes 3W Resitors (A bit bigger than 1N4007 leads). Thanks, Jon
- 80%
Unknown Reference Designator - 3/18/09 -
- ... 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 ...
- 80%
SOT23s and paste + glue - 12/22/08 -
- ... our process like that all the time paste then glue we use same profile as if we were just reflowing paste once in a while we have A plastic bodied part that has that problem we asume it was some mold relase still on the part basicly comtamenation on the body of the part we don't place sot-23 but do place some other plastic bodied diodes with j leads. just look at your glue dot where the sot-23 feal off and see if the glue dot is flat on top or not that will tell you if the part touched the glue ...
- 80%
Laser solder reflection - 11/23/07 -
- 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 gary ...
- 80%
Please help me identify this diode - 7/18/07 -
- 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
- 80%
Wave Soldering Process Restrictions - 2/21/07 -
- Wave Soldering Process Restrictions Good Morning Everyone, I just wanted to get a feel for what other Contract Mnufacturers are doing. Do you allow a production PCB assembly with glued SMT components to be wave processed more than once? (e.g. the first pass did not produce acceptable results so the operator made some adjustments and ran it through again) I am specifically concerned with glass MELF diodes on the wave side. Opinions would be appreciated. Thanks Chris
- 80%
Unknown Schematic Drawing - 10/20/06 -
- 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 ...
- 80%
Unknown Schematic Drawing - 10/12/06 -
- 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 ...
- 80%
Unknown Schematic Drawing - 10/10/06 -
- Unknown Schematic Drawing Photo sensitive diode? See here: http://library.thinkquest.org/10784/circuit_symbols.html
- 80%
0402 feeders - 8/3/06 -
- 0402 feeders Hi AJ, Just had a look though our parent company's stock on components, and even the smallest of diodes & transistors (such as DFN1006-2 package - roughly 0402)come on 8x4 plastic. All of the 8x2 pitch tapes are paper (EIA: 01005, 0201, 0402; JIS: 0402, 0603, 1005). It's not totally comprehensive, but it covers around 70 component manufacturers. Also we never used/needed 8x2 plastic for our CP's. Rob ...
- 80%
SM4007A Genpurpose Diode - 6/13/06 -
- SM4007A Genpurpose Diode davef burns you agin! Haha! We know more than you ...
- 80%
Assembl?on feeders - 6/13/06 -
- 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 not ...
- 80%
SM4007A Genpurpose Diode - 6/11/06 -
- SM4007A Genpurpose Diode "Chunkie" - Ha ha again Chunks! Davef burns you again you dumb SOB ...
- 80%
SM4007A Genpurpose Diode - 6/10/06 -
- 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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