Post by thread:[EE] Upside down SMD phototransistor

Is anyone aware of a surface mount photo transistor (or other optical sensor) that is available on tape packaged face down ? We currently use 0805 LEDs supplied in that manner but I haven't found a sensor. Volumes are too high for hand placement but not high enough to influence a semi supplier. Steve. ========================================== Steve Baldwin Electronic Product Design TLA Microsystems Ltd Microcontroller Specialists PO Box 15-680, New Lynn http://www.tla.co.nz Auckland, New Zealand ph +64 9 820-2221 email: spam_OUTsteveTakeThisOuTtla.co.nz fax +64 9 820-1929 =========================================

At 09:26 AM 1/20/2005 +1300, you wrote: >Is anyone aware of a surface mount photo transistor (or other optical >sensor) that is available on tape packaged face down ? >We currently use 0805 LEDs supplied in that manner but I haven't found >a sensor. Volumes are too high for hand placement but not high enough >to influence a semi supplier. > >Steve. Ummm... could you use an LED? Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" .....speffKILLspam@spam@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

On Thu, 20 Jan 2005 09:26:29 +1300, you wrote: >Is anyone aware of a surface mount photo transistor (or other optical >sensor) that is available on tape packaged face down ? >We currently use 0805 LEDs supplied in that manner but I haven't found >a sensor. Volumes are too high for hand placement but not high enough >to influence a semi supplier. I assume what you are looking for is a sensor that looks 'through the PCB' : Vishay TEMD1000 http://www.vishay.com/docs/81564/81564.pdf They also do emitters - TSML1000

A LED will ususally operate as an (somewhat insensitive) sensor if pushed. RP Is anyone aware of a surface mount photo transistor (or other optical sensor) that is available on tape packaged face down ? We currently use 0805 LEDs supplied in that manner but I haven't found a sensor. Volumes are too high for hand placement but not high enough to influence a semi supplier. Steve.

Why not just mount the transistor on the bottom of the board? Alternatively, and probably not usable by automated assemblers, (unless they can drop a part and push?) punch/route a rectangular hole in the board and have the part hang by it's leads into the hole. Spehro Pefhany wrote: {Quote hidden}> At 09:26 AM 1/20/2005 +1300, you wrote: > >> Is anyone aware of a surface mount photo transistor (or other optical >> sensor) that is available on tape packaged face down ? >> We currently use 0805 LEDs supplied in that manner but I haven't found >> a sensor. Volumes are too high for hand placement but not high enough >> to influence a semi supplier. >> >> Steve. > > > Ummm... could you use an LED? Good idea. Although LED's have much poorer sensitivity, they are photoelectric. It seems they have best gain when seeing their own color of light (at least for the half dozen types I played with). Robert

On Sat, 22 Jan 2005 12:27:24 -0700, you wrote: {Quote hidden}>Why not just mount the transistor on the bottom of the board? > >Alternatively, and probably not usable by automated assemblers, >(unless they can drop a part and push?) >punch/route a rectangular hole in the board and have the part >hang by it's leads into the hole. > >Spehro Pefhany wrote: > >> At 09:26 AM 1/20/2005 +1300, you wrote: >> >>> Is anyone aware of a surface mount photo transistor (or other optical >>> sensor) that is available on tape packaged face down ? >>> We currently use 0805 LEDs supplied in that manner but I haven't found >>> a sensor. Volumes are too high for hand placement but not high enough >>> to influence a semi supplier. >>> >>> Steve. >> >> >> Ummm... could you use an LED? > >Good idea. Although LED's have much poorer sensitivity, >they are photoelectric. It seems they have best gain when >seeing their own color of light (at least for the half >dozen types I played with). > >Robert Not sure if this got through last time I posted it... Vishay gull-wing parts available in normal and reverse orientation and taping. Try http://www.ebv.com for pricing TEMT 1000 (phototransistor) http://www.vishay.com/docs/81554/81554.pdf TEMD 1000 (photodiode) http://www.vishay.com/docs/81564/81564.pdf TSML1000 (IR LED) http://www.vishay.com/docs/81033/81033.pdf I know Agilent do something similar to the LED, but quite a lot more expensive - they may also do detectors in the same package.