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soldering SMD TXCO
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Hi All, Sorry if this question has been addressed before. Has anyone soldered the FOX924B-27.000 TXCO to the Synth board using a standard soldering iron? From the datasheet, the TXCO pads are under the chip and appear to require a hot air gun...but there are small dimples in the corners of the chip. Can those be used to access the pins with an iron? Best, Chris, VO1CKD |
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Liquid Flux is key here.? 60/40 lead solder helps also.? Place a bit of flux on each pad of the PCB.? Use a very small amount of solder and tin one pad.? Re-apply flux to that pad.? Place the part, hold down, and apply heat to the tinned pad perimeter.? When the solder wets, the part will settle on.? Apply solder and heat to the remaining pads at the margin.? Go back and touch up with a bit of extra flux and solder so that the pad appears to be "wet". The tiny tracks on the side of the chip may or may not be needed.? On an SI570 the ends are critical. I've had 100% success with this method. 73 Larry KB3CUF On Fri, Nov 3, 2017 at 10:02 AM, Chris Dunnett via Groups.Io <chris_dunnett@...> wrote:
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Thanks Larry. I'm looking forward to trying this. I'm using kester 44 - 63/37, 0.8mm. Is there a noticeable difference between mine and 60/40? Any recommendations for liquid flux? I've been looking at Quik-Chip's Tack Flux (digi-key SMD291ST2CC6-ND). Best, Chris, VO1CKD
On Friday, November 3, 2017, 11:41:23 AM NDT, Larry Acklin <acklin@...> wrote:
Liquid Flux is key here.? 60/40 lead solder helps also.? Place a bit of flux on each pad of the PCB.? Use a very small amount of solder and tin one pad.? Re-apply flux to that pad.? Place the part, hold down, and apply heat to the tinned pad perimeter.? When the solder wets, the part will settle on.? Apply solder and heat to the remaining pads at the margin.? Go back and touch up with a bit of extra flux and solder so that the pad appears to be "wet". The tiny tracks on the side of the chip may or may not be needed.? On an SI570 the ends are critical. I've had 100% success with this method. 73 Larry KB3CUF On Fri, Nov 3, 2017 at 10:02 AM, Chris Dunnett via Groups.Io <chris_dunnett@...> wrote:
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All good!? Eutectic solder just melts at a lower temp.? Lead free is a PITA.? Any liquid flux (rosin based is what I use) will do,? Flux makes it work.? As long as the part wets with flux, the solder will follow along.? No Flux wont work well.? I avoid the water wash versions, and use 91% alcohol and a toothbrush to clean up. Larry? On Fri, Nov 3, 2017 at 10:33 AM, Chris Dunnett via Groups.Io <chris_dunnett@...> wrote:
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Hello Chris,
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I posted this reply earlier today to an unrelated post, for sure, you need liquid flux and don't even think about unleaded solder! "Perhaps consider getting one of the cheap Fox TCXO's? I use them in U3S and they work great with GPS from a QLG1. They are a bit fiddly to solder until you realize they aren't as delicate as they look and you put four solder blobs on the PCB pads and on the pads of the Fox, then fuse them together with a hot iron going around all four in succession very rapidly. I have even used a crude hot air pen (gas soldering pencil torch with the hot air tip on it) to remove and re-use one from a dead board. I was amazed it survived the experience but it was just as good as a new one!" 2E0ILY Friday, November 3, 2017 Hi All, Sorry if this question has been addressed before. Has anyone soldered the FOX924B-27.000 TXCO to the Synth board Best, -- 2E0ILY Best regards, Chris mailto:chris@... --
Best regards, Chris Wilson (2E0ILY) |
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