Hello, It is probably a TLC27M24BI quad opamp from Texas Instruments, http://focus.ti.com/docs/prod/folders/print/tlc27m4b.html
Regards, Javier, EA1CRB [EMAIL PROTECTED] wrote: >Hi all, > >Have decided to get stuck into fault finding my 5650A again. With no replies >from FEI over the past 2 months, have decided to trace out the PCB the good >old fasioned way, however the only IC on the 1 inch square PCB PCB has me >completely lost. > >So to the question, has any one ever come across a device marking of 27M4Bl >or possibly a bad i(I) not an L(l)?? > >It's a SMD 14 pin Case751, with Gnd on pin 11 and Vcc on pin 4. This device >is on the Rubidium lamp PCB and forms part of the Rb thermal control circuit. > >I am leaning towards a quad op amp, but it's possible failure makes it very >difficult to diagnose, it could also be a comparator. > >Any suggestions are welcome. > >Regards > > >Gerald > > > > >_______________________________________________ >time-nuts mailing list >time-nuts@febo.com >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts